[cron] Bump distribution date (2026-01-25)

Followup to #28275

.aiderignore

@@ -0,0 +1,21 @@
+# Build artifacts
+buildroot/
+*.o
+*.a
+*.so
+*.dylib
+*.dll
+*.exe
+
+# Web assets
+*.min.js
+*.min.css
+
+# Generated files
+__pycache__/
+*.pyc
+.DS_Store
+
+# IDE files
+.vscode/
+.idea/

.devcontainer/Dockerfile

@@ -0,0 +1,29 @@
+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.187.0/containers/python-3/.devcontainer/base.Dockerfile
+
+# [Choice] Python version: 3, 3.9, 3.8, 3.7, 3.6
+ARG VARIANT="3.9.0-buster"
+FROM python:${VARIANT}
+
+# [Option] Install Node.js
+ARG INSTALL_NODE="true"
+ARG NODE_VERSION="lts/*"
+RUN if [ "${INSTALL_NODE}" = "true" ]; then su vscode -c "umask 0002 && . /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"; fi
+
+# [Optional] If your pip requirements rarely change, uncomment this section to add them to the image.
+# COPY requirements.txt /tmp/pip-tmp/
+# RUN pip3 --disable-pip-version-check --no-cache-dir install -r /tmp/pip-tmp/requirements.txt \
+#    && rm -rf /tmp/pip-tmp
+
+# [Optional] Uncomment this section to install additional OS packages.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>
+
+# [Optional] Uncomment this line to install global node packages.
+# RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && npm install -g <your-package-here>" 2>&1
+
+
+RUN pip install -U https://github.com/platformio/platformio-core/archive/develop.zip
+RUN platformio update
+# To get the test platforms
+RUN pip install PyYaml
+#ENV PATH /code/buildroot/bin/:/code/buildroot/tests/:${PATH}

.devcontainer/devcontainer.json

@@ -0,0 +1,51 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.187.0/containers/python-3
+{
+  "name": "Python 3",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": "..",
+    "args": {
+      // Update 'VARIANT' to pick a Python version: 3, 3.6, 3.7, 3.8, 3.9
+      "VARIANT": "3.9.0-buster",
+      // Options
+      "INSTALL_NODE": "false",
+      "NODE_VERSION": "lts/*"
+    }
+  },
+
+  // Set *default* container specific settings.json values on container create.
+  "settings": {
+    "python.pythonPath": "/usr/local/bin/python",
+    "python.languageServer": "Pylance",
+    "python.linting.enabled": true,
+    "python.linting.pylintEnabled": true,
+    "python.formatting.autopep8Path": "/usr/local/py-utils/bin/autopep8",
+    "python.formatting.blackPath": "/usr/local/py-utils/bin/black",
+    "python.formatting.yapfPath": "/usr/local/py-utils/bin/yapf",
+    "python.linting.banditPath": "/usr/local/py-utils/bin/bandit",
+    "python.linting.flake8Path": "/usr/local/py-utils/bin/flake8",
+    "python.linting.mypyPath": "/usr/local/py-utils/bin/mypy",
+    "python.linting.pycodestylePath": "/usr/local/py-utils/bin/pycodestyle",
+    "python.linting.pydocstylePath": "/usr/local/py-utils/bin/pydocstyle",
+    "python.linting.pylintPath": "/usr/local/py-utils/bin/pylint"
+  },
+
+  // Add the IDs of extensions you want installed when the container is created.
+  "extensions": [
+    "ms-python.python",
+    "ms-python.vscode-pylance",
+    "platformio.platformio-ide",
+    "marlinfirmware.auto-build",
+    "editorconfig.editorconfig"
+  ]
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  // , "forwardPorts": []
+
+  // Use 'postCreateCommand' to run commands after the container is created.
+  // , "postCreateCommand": "pip3 install --user -r requirements.txt"
+
+  // Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+  // , "remoteUser": "vscode"
+}

.editorconfig

@@ -1,19 +1,33 @@
 # editorconfig.org
 root = true
 
+[*]
+trim_trailing_whitespace = true
+insert_final_newline = true
+
 [{*.patch,syntax_test_*}]
 trim_trailing_whitespace = false
 
-[{*.c,*.cpp,*.h}]
-charset = utf-8
-
-[{*.c,*.cpp,*.h,Makefile}]
-trim_trailing_whitespace = true
-insert_final_newline = true
+[{*.c,*.cpp,*.h,*.ino,*.py,Makefile}]
 end_of_line = lf
+
+[{*.c,*.cpp,*.h,*.ino}]
+charset = utf-8
 indent_style = space
 indent_size = 2
 
-[{*.py,*.conf,*.sublime-project}]
+[{Makefile}]
+indent_style = tab
+indent_size = 2
+
+[*.md]
+# Two spaces at the end of the line means newline in Markdown
+trim_trailing_whitespace = false
+
+[{*.py}]
+indent_style = space
+indent_size = 4
+
+[{*.conf,*.sublime-project}]
 indent_style = tab
 indent_size = 4

.gitattributes

@@ -17,3 +17,5 @@
 *.png binary
 *.jpg binary
 *.fon binary
+*.bin binary
+*.woff binary

.github/FUNDING.yml

@@ -1,3 +1,3 @@
 github: [thinkyhead]
 patreon: thinkyhead
-custom: ["http://www.thinkyhead.com/donate-to-marlin"]
+custom: ["https://www.thinkyhead.com/donate-to-marlin"]

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,43 +0,0 @@
----
-name: Bug report
-about: Report a bug in Marlin
-title: "[BUG] (short description)"
-labels: ''
-assignees: ''
-
----
-
-<!--
-
-Have you read Marlin's Code of Conduct? By filing an Issue, you are expected to comply with it, including treating everyone with respect: https://github.com/MarlinFirmware/Marlin/blob/master/.github/code_of_conduct.md
-
-Do you want to ask a question? Are you looking for support? Please don't post here. Instead please use one of the support links at https://github.com/MarlinFirmware/Marlin/issues/new/choose
-
-Before filing an issue be sure to test the "bugfix" branches to see whether the issue has been resolved.
-
--->
-
-### Bug Description
-
-<!-- Description of the bug -->
-
-### My Configurations
-
-**Required:** Please include a ZIP file containing your `Configuration.h` and `Configuration_adv.h` files.
-
-### Steps to Reproduce
-
-<!-- Please describe the steps needed to reproduce the issue -->
-
-1. [First Step]
-2. [Second Step]
-3. [and so on...]
-
-**Expected behavior:** [What you expect to happen]
-
-**Actual behavior:** [What actually happens]
-
-#### Additional Information
-
-* Provide pictures or links to videos that clearly demonstrate the issue.
-* See [How Can I Contribute](#how-can-i-contribute) for additional guidelines.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,184 @@
+name: 🪲 Report a bug
+description: Create a bug report to help improve Marlin Firmware
+title: "[BUG] (bug summary)"
+labels: ["Bug: Potential ?"]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        Do you want to ask a question? Are you looking for support? Please use one of the [support links](https://github.com/MarlinFirmware/Marlin/issues/new/choose).
+
+  - type: markdown
+    attributes:
+      value: |
+        **Thank you for reporting a bug in Marlin Firmware!**
+
+        ## Before Reporting a Bug
+
+        - Read and understand Marlin's [Code of Conduct](https://github.com/MarlinFirmware/Marlin/blob/bugfix-2.1.x/.github/code_of_conduct.md). You are expected to comply with it, including treating everyone with respect.
+
+        - Test with the [`bugfix-2.1.x` branch](https://github.com/MarlinFirmware/Marlin/archive/bugfix-2.1.x.zip) to see whether the issue still exists.
+
+        ## Instructions
+
+        Please follow the instructions below. Failure to do so may result in your issue being closed. See [Contributing to Marlin](https://github.com/MarlinFirmware/Marlin/blob/bugfix-2.1.x/.github/contributing.md) for additional guidelines.
+
+        1. Provide a good title starting with [BUG].
+        2. Fill out all sections of this bug report form.
+        3. Always attach configuration files so we can build and test your setup.
+
+  - type: dropdown
+    attributes:
+      label: Did you test the latest `bugfix-2.1.x` code?
+      description: >-
+        Always try the latest code to make sure the issue you are reporting is not already fixed. To download
+        the latest code just [click this link](https://github.com/MarlinFirmware/Marlin/archive/bugfix-2.1.x.zip).
+      options:
+        - Yes, and the problem still exists.
+        - No, but I will test it now!
+    validations:
+      required: true
+
+  - type: markdown
+    attributes:
+      value: |
+        # Bug Details
+
+  - type: textarea
+    attributes:
+      label: Bug Description
+      description: >-
+        Describe the bug in this section. Tell us what you were trying to do and what
+        happened that you did not expect. Provide a clear and concise description of the
+        problem and include as many details as possible.
+
+        When pasting formatted text don't forget to put ` ``` ` (on its own line) before and after to make it readable.
+      placeholder: |
+        Marlin doesn't work.
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Bug Timeline
+      description: Is this a new bug or an old issue? When did it first start?
+
+  - type: textarea
+    attributes:
+      label: Expected behavior
+      description: >-
+        What did you expect to happen?
+      placeholder: I expected it to move left.
+
+  - type: textarea
+    attributes:
+      label: Actual behavior
+      description: What actually happened instead?
+      placeholder: It moved right instead of left.
+
+  - type: textarea
+    attributes:
+      label: Steps to Reproduce
+      description: >-
+        Please describe the steps needed to reproduce the issue.
+      placeholder: |
+        1. [First Step] ...
+        2. [Second Step] ...
+        3. [and so on] ...
+
+  - type: markdown
+    attributes:
+      value: |
+        # Your Setup
+
+  - type: input
+    attributes:
+      label: Version of Marlin Firmware
+      description: "See the About Menu on the LCD or the output of `M115`. NOTE: For older releases we only patch critical bugs."
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Printer model
+      description: Creality Ender-3, Prusa mini, or Kossel Delta?
+
+  - type: input
+    attributes:
+      label: Electronics
+      description: Stock electronics, upgrade board, or something else?
+
+  - type: input
+    attributes:
+      label: LCD/Controller
+      description: Some Marlin behaviors are determined by the controller. Describe your LCD/Controller model and version.
+
+  - type: input
+    attributes:
+      label: Other add-ons
+      description: Please list any other hardware add-ons that could be involved.
+
+  - type: dropdown
+    attributes:
+      label: Bed Leveling
+      description: What kind of bed leveling compensation are you using?
+      options:
+        - UBL Bilinear mesh
+        - ABL Bilinear mesh
+        - ABL Linear grid
+        - ABL 3-point
+        - MBL Manual Bed Leveling
+        - No Bed Leveling
+
+  - type: dropdown
+    attributes:
+      label: Your Slicer
+      description: Do you use Slic3r, Prusa Slicer, Simplify3D, IdeaMaker...?
+      options:
+        - Slic3r
+        - Simplify3D
+        - Prusa Slicer
+        - IdeaMaker
+        - Cura
+        - Other (explain below)
+
+  - type: dropdown
+    attributes:
+      label: Host Software
+      description: Do you use OctoPrint, Repetier Host, Pronterface...?
+      options:
+        - SD Card (headless)
+        - Repetier Host
+        - OctoPrint
+        - Pronterface
+        - Cura
+        - Same as my slicer
+        - Other (explain below)
+
+  - type: markdown
+    attributes:
+      value: |
+        # Attachments
+
+  - type: checkboxes
+    attributes:
+      label: Don't forget to include
+      options:
+        - label: A ZIP file containing your `Configuration.h` and `Configuration_adv.h`.
+          required: true
+
+  - type: markdown
+    attributes:
+      value: |
+        ### Optional items to include:
+        - 'Log output from the host. (`M111 S247` for maximum logging.)'
+        - Images or videos demonstrating the problem, if it helps to make it clear.
+        - A G-Code file that exposes the problem, if not affecting _all_ G-code.
+
+  - type: textarea
+    attributes:
+      label: Additional information & file uploads
+      description: >-
+        If you've made any other modifications to the firmware, please describe them in detail.
+
+        When pasting formatted text don't forget to put ` ``` ` (on its own line) before and after to make it readable.

.github/ISSUE_TEMPLATE/config.yml

@@ -1,17 +1,20 @@
 blank_issues_enabled: false
 contact_links:
-  - name: Marlin Documentation
-    url: http://marlinfw.org/
+  - name: 📖 Marlin Documentation
+    url: https://marlinfw.org/
     about: Lots of documentation on installing and using Marlin.
-  - name: MarlinFirmware Facebook group
+  - name: 👤 MarlinFirmware Facebook group
     url: https://www.facebook.com/groups/1049718498464482
     about: Please ask and answer questions here.
-  - name: Marlin on Discord
-    url: https://discord.gg/n5NJ59y
+  - name: 🕹 Marlin on Discord
+    url: https://discord.com/servers/marlin-firmware-461605380783472640
     about: Join the Discord server for support and discussion.
-  - name: Marlin Discussion Forum
-    url: http://forums.reprap.org/list.php?415
+  - name: 🔗 Marlin Discussion Forum
+    url: https://reprap.org/forum/list.php?415
     about: A searchable web forum hosted by RepRap dot org.
-  - name: Marlin Videos on YouTube
+  - name: 📺 Marlin Videos on YouTube
     url: https://www.youtube.com/results?search_query=marlin+firmware
     about: Tutorials and more from Marlin users all around the world. Great for new users!
+  - name: 💸 Want to donate?
+    url: https://www.thinkyhead.com/donate-to-marlin
+    about: Please take a look at the various options to support Marlin Firmware's development financially!

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,35 +0,0 @@
----
-name: Feature request
-about: Request a Feature
-title: "[FR] (feature request title)"
-labels: ''
-assignees: ''
-
----
-
-<!--
-
-Have you read Marlin's Code of Conduct? By filing an Issue, you are expected to comply with it, including treating everyone with respect: https://github.com/MarlinFirmware/Marlin/blob/master/.github/code_of_conduct.md
-
-Do you want to ask a question? Are you looking for support? Please don't post here. Instead please use one of the support links at https://github.com/MarlinFirmware/Marlin/issues/new/choose
-
-Before filing an issue be sure to test the "bugfix" branches to see whether the issue has been resolved.
-
--->
-
-### Description
-
-<!-- Description of the requested feature -->
-
-### Feature Workflow
-
-<!-- Please describe the feature's behavior, user interaction, etc. -->
-
-1. [First Action]
-2. [Second Action]
-3. [and so on...]
-
-#### Additional Information
-
-* Provide pictures or links that demonstrate a similar feature or concept.
-* See [How Can I Contribute](#how-can-i-contribute) for additional guidelines.

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,44 @@
+name: ✨ Request a feature
+description: Request a new Marlin Firmware feature
+title: "[FR] (feature summary)"
+labels: ["T: Feature Request"]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        Do you want to ask a question? Are you looking for support? Please use one of the [support links](https://github.com/MarlinFirmware/Marlin/issues/new/choose).
+
+  - type: markdown
+    attributes:
+      value: >
+        **Thank you for requesting a new Marlin Firmware feature!**
+
+        ## Before Requesting a Feature
+
+        - Read and understand Marlin's [Code of Conduct](https://github.com/MarlinFirmware/Marlin/blob/master/.github/code_of_conduct.md). You are expected to comply with it, including treating everyone with respect.
+
+        - Check the latest [`bugfix-2.1.x` branch](https://github.com/MarlinFirmware/Marlin/archive/bugfix-2.1.x.zip) to see if the feature already exists.
+
+        - Before you proceed with your request, please consider if it is necessary to make it into a firmware feature, or if it may be better suited for a slicer or host feature.
+
+  - type: textarea
+    attributes:
+      label: Is your feature request related to a problem? Please describe.
+      description: A clear description of the problem (e.g., "I need X but Marlin can't do it [...]").
+
+  - type: textarea
+    attributes:
+      label: Are you looking for hardware support?
+      description: Tell us the printer, board, or peripheral that needs support.
+
+  - type: textarea
+    attributes:
+      label: Describe the feature you want
+      description: A clear description of the feature and how you think it should work.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.

.github/code_of_conduct.md

@@ -8,19 +8,19 @@ In the interest of fostering an open and welcoming environment, we as contributo
 
 Examples of behavior that contributes to creating a positive environment include:
 
-* Using welcoming and inclusive language
-* Being respectful of differing viewpoints and experiences
-* Gracefully accepting constructive criticism
-* Focusing on what is best for the community
-* Showing empathy towards other community members
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+- Showing empathy towards other community members
 
 Examples of unacceptable behavior by participants include:
 
-* The use of sexualized language or imagery and unwelcome sexual attention or advances
-* Trolling, insulting/derogatory comments, and personal or political attacks
-* Public or private harassment
-* Publishing others' private information, such as a physical or electronic address, without explicit permission
-* Other conduct which could reasonably be considered inappropriate in a professional setting
+- The use of sexualized language or imagery and unwelcome sexual attention or advances
+- Trolling, insulting/derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or electronic address, without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a professional setting
 
 ## Our Responsibilities
 
@@ -28,15 +28,9 @@ Project maintainers are responsible for clarifying the standards of acceptable b
 
 Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
 
-## Scope
-
-This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
-
 ## Enforcement
 
-Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at [marlinfirmware@github.com](mailto:marlinfirmware@github.com). All complaints will be reviewed and investigated and will result in a response that is deemed necessary and appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
-
-Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by following GitHub's [reporting abuse or spam article](https://docs.github.com/en/communities/maintaining-your-safety-on-github/reporting-abuse-or-spam). All complaints will be reviewed and investigated and will result in a response that is deemed necessary and appropriate to the circumstances.
 
 ## Attribution
 

.github/contributing.md

@@ -11,39 +11,46 @@ The following is a set of guidelines for contributing to Marlin, hosted by the [
 [I don't want to read this whole thing, I just have a question!!!](#i-dont-want-to-read-this-whole-thing-i-just-have-a-question)
 
 [How Can I Contribute?](#how-can-i-contribute)
-  * [Reporting Bugs](#reporting-bugs)
-  * [Suggesting Features or Changes](#suggesting-features-or-changes)
-  * [Your First Code Contribution](#your-first-code-contribution)
-  * [Pull Requests](#pull-requests)
+
+- [Reporting Bugs](#reporting-bugs)
+- [Suggesting Features or Changes](#suggesting-features-or-changes)
+- [Your First Code Contribution](#your-first-code-contribution)
+- [Pull Requests](#pull-requests)
 
 [Styleguides](#styleguides)
-  * [Git Commit Messages](#git-commit-messages)
-  * [C++ Coding Standards](#c++-coding-standards)
-  * [Documentation Styleguide](#documentation)
+
+- [Git Commit Messages](#git-commit-messages)
+- [C++ Coding Standards](#c++-coding-standards)
+- [Documentation Styleguide](#documentation)
 
 [Additional Notes](#additional-notes)
-  * [Issue and Pull Request Labels](#issue-and-pull-request-labels)
+
+- [Issue and Pull Request Labels](#issue-and-pull-request-labels)
 
 ## Code of Conduct
 
-This project and everyone participating in it is governed by the [Marlin Code of Conduct](code_of_conduct.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to [marlinfirmware@github.com](mailto:marlinfirmware@github.com).
+This project and everyone participating in it is governed by the [Marlin Code of Conduct](code_of_conduct.md). By participating, you are expected to uphold this code. Please report unacceptable behavior by following GitHub's [reporting abuse or spam article](https://docs.github.com/en/communities/maintaining-your-safety-on-github/reporting-abuse-or-spam).
 
 ## I don't want to read this whole thing I just have a question!!!
 
-> **Note:** Please don't file an issue to ask a question. You'll get faster results by using the resources below.
+> [!NOTE]
+>
+> Please don't file an issue to ask a question. You'll get faster results by using the resources below.
 
 We have a Message Board and a Facebook group where our knowledgable user community can provide helpful advice if you have questions.
 
-* [Marlin RepRap forum](http://forums.reprap.org/list.php?415)
-* [MarlinFirmware on Facebook](https://www.facebook.com/groups/1049718498464482/)
+- [Marlin Documentation](https://marlinfw.org) - Official Marlin documentation
+- Facebook Group ["Marlin Firmware"](https://www.facebook.com/groups/1049718498464482/)
+- RepRap.org [Marlin Forum](https://forums.reprap.org/list.php?415)
+- Facebook Group ["Marlin Firmware for 3D Printers"](https://www.facebook.com/groups/3Dtechtalk/)
+- [Marlin Configuration](https://www.youtube.com/results?search_query=marlin+configuration) on YouTube
 
-If chat is more your speed, you can join the MarlinFirmware Slack team:
+If chat is more your speed, you can join the MarlinFirmware Discord server:
 
-* Join the Marlin Slack Team
-  * To obtain group access, please [send a request](http://www.thinkyhead.com/contact/9) to @thinkyhead.
-  * Even though Slack is a chat service, sometimes it takes several hours for community members to respond — please be patient!
-  * Use the `#general` channel for general questions or discussion about Marlin.
-  * Other channels exist for certain topics. Check the channel list.
+- Use the link https://discord.com/servers/marlin-firmware-461605380783472640 to join up as a General User.
+- Even though our Discord is pretty active, it may take a while for community members to respond — please be patient!
+- Use the `#general` channel for general questions or discussion about Marlin.
+- Other channels exist for certain topics or are limited to Patrons. Check the channel list.
 
 ## How Can I Contribute?
 
@@ -51,94 +58,96 @@ If chat is more your speed, you can join the MarlinFirmware Slack team:
 
 This section guides you through submitting a Bug Report for Marlin. Following these guidelines helps maintainers and the community understand your report, reproduce the behavior, and find related reports.
 
-Before creating a Bug Report, please test the "nightly" development branch, as you might find out that you don't need to create one. When you are creating a Bug Report, please [include as many details as possible](#how-do-i-submit-a-good-bug-report). Fill out [the required template](issue_template.md), the information it asks for helps us resolve issues faster.
+Before creating a Bug Report, please test the "nightly" development branch, as you might find out that you don't need to create one. When you are creating a Bug Report, please [include as many details as possible](#how-do-i-submit-a-good-bug-report). Fill out [the required template](ISSUE_TEMPLATE/bug_report.yml), the information it asks for helps us resolve issues faster.
 
-> **Note:** Regressions can happen. If you find a **Closed** issue that seems like your issue, go ahead and open a new issue and include a link to the original issue in the body of your new one. All you need to create a link is the issue number, preceded by #. For example, #8888.
+> [!NOTE]
+>
+> Regressions can happen. If you find a **Closed** issue that seems like your issue, go ahead and open a new issue and include a link to the original issue in the body of your new one. All you need to create a link is the issue number, preceded by #. For example, #8888.
 
 #### How Do I Submit A (Good) Bug Report?
 
-Bugs are tracked as [GitHub issues](https://guides.github.com/features/issues/). Use the New Issue button to create an issue and provide the following information by filling in [the template](issue_template.md).
+Bugs are tracked as [GitHub issues](https://guides.github.com/features/issues/). Use the New Issue button to create an issue and provide the following information by filling in [the template](ISSUE_TEMPLATE/bug_report.yml).
 
 Explain the problem and include additional details to help maintainers reproduce the problem:
 
-* **Use a clear and descriptive title** for the issue to identify the problem.
-* **Describe the exact steps which reproduce the problem** in as many details as possible. For example, start by explaining how you started Marlin, e.g. which command exactly you used in the terminal, or how you started Marlin otherwise. When listing steps, **don't just say what you did, but explain how you did it**. For example, if you moved the cursor to the end of a line, explain if you used the mouse, or a keyboard shortcut or an Marlin command, and if so which one?
-* **Provide specific examples to demonstrate the steps**. Include links to files or GitHub projects, or copy/pasteable snippets, which you use in those examples. If you're providing snippets or log output in the issue, use [Markdown code blocks](https://help.github.com/articles/markdown-basics/#multiple-lines).
-* **Describe the behavior you observed after following the steps** and point out what exactly is the problem with that behavior.
-* **Explain which behavior you expected to see instead and why.**
-* **Include detailed log output** especially for probing and leveling. See below for usage of `DEBUG_LEVELING_FEATURE`.
-* **Include screenshots, links to videos, etc.** which clearly demonstrate the problem.
-* **Include G-code** (if relevant) that reliably causes the problem to show itself.
-* **If the problem wasn't triggered by a specific action**, describe what you were doing before the problem happened and share more information using the guidelines below.
+- **Use a clear and descriptive title** for the issue to identify the problem.
+- **Describe the exact steps which reproduce the problem** in as many details as possible. For example, start by explaining how you started Marlin, e.g. which command exactly you used in the terminal, or how you started Marlin otherwise. When listing steps, **don't just say what you did, but explain how you did it**. For example, if you moved the cursor to the end of a line, explain if you used the mouse, or a keyboard shortcut or an Marlin command, and if so which one?
+- **Provide specific examples to demonstrate the steps**. Include links to files or GitHub projects, or copy/pasteable snippets, which you use in those examples. If you're providing snippets or log output in the issue, use [Markdown code blocks](https://help.github.com/articles/markdown-basics/#multiple-lines).
+- **Describe the behavior you observed after following the steps** and point out what exactly is the problem with that behavior.
+- **Explain which behavior you expected to see instead and why.**
+- **Include detailed log output** especially for probing and leveling. See below for usage of `DEBUG_LEVELING_FEATURE`.
+- **Include screenshots, links to videos, etc.** which clearly demonstrate the problem.
+- **Include G-code** (if relevant) that reliably causes the problem to show itself.
+- **If the problem wasn't triggered by a specific action**, describe what you were doing before the problem happened and share more information using the guidelines below.
 
 Provide more context:
 
-* **Can you reproduce the problem with a minimum of options enabled?**
-* **Did the problem start happening recently** (e.g. after updating to a new version of Marlin) or was this always a problem?
-* If the problem started happening recently, **can you reproduce the problem in an older version of Marlin?** What's the most recent version in which the problem doesn't happen? You can download older versions of Marlin from [the releases page](https://github.com/MarlinFirmware/Marlin/releases).
-* **Can you reliably reproduce the issue?** If not, provide details about how often the problem happens and under which conditions it normally happens.
+- **Can you reproduce the problem with a minimum of options enabled?**
+- **Did the problem start happening recently** (e.g. after updating to a new version of Marlin) or was this always a problem?
+- If the problem started happening recently, **can you reproduce the problem in an older version of Marlin?** What's the most recent version in which the problem doesn't happen? You can download older versions of Marlin from [the releases page](https://github.com/MarlinFirmware/Marlin/releases).
+- **Can you reliably reproduce the issue?** If not, provide details about how often the problem happens and under which conditions it normally happens.
 
 Include details about your configuration and environment:
 
-* **Which version of Marlin are you using?** Marlin's exact version and build date can be seen in the startup message when a host connects to Marlin, or in the LCD Info menu (if enabled).
-* **What kind of 3D Printer and electronics are you using**?
-* **What kind of add-ons (probe, filament sensor) do you have**?
-* **Include your Configuration files.** Make a ZIP file containing `Configuration.h` and `Configuration_adv.h` and drop it on your reply.
+- **Which version of Marlin are you using?** Marlin's exact version and build date can be seen in the startup message when a host connects to Marlin, or in the LCD Info menu (if enabled).
+- **What kind of 3D Printer and electronics are you using**?
+- **What kind of add-ons (probe, filament sensor) do you have**?
+- **Include your Configuration files.** Make a ZIP file containing `Configuration.h` and `Configuration_adv.h` and drop it on your reply.
 
 ### Suggesting Features or Changes
 
 This section guides you through submitting a suggestion for Marlin, including completely new features and minor improvements to existing functionality. Following these guidelines helps maintainers and the community understand your suggestion and find related suggestions.
 
-Before creating a suggestion, please check [this list](#before-submitting-a-suggestion) as you might find out that you don't need to create one. When you are creating an enhancement suggestion, please [include as many details as possible](#how-do-i-submit-a-good-enhancement-suggestion). Fill in [the template](issue_template.md), including the steps that you imagine you would take if the feature you're requesting existed.
+Before creating a suggestion, please check [this list](https://github.com/MarlinFirmware/Marlin/issues?q=is%3Aopen+is%3Aissue+label%3A%22T%3A+Feature+Request%22) as you might find out that you don't need to create one. When you are creating an enhancement suggestion, please [include as many details as possible](#how-do-i-submit-a-good-feature-request). Fill in [the template](ISSUE_TEMPLATE/feature_request.yml), including the steps that you imagine you would take if the feature you're requesting existed.
 
 #### Before Submitting a Feature Request
 
-* **Check the [Marlin website](http://marlinfw.org/)** for tips — you might discover that the feature is already included. Most importantly, check if you're using [the latest version of Marlin](https://github.com/MarlinFirmware/Marlin/releases) and if you can get the desired behavior by changing [Marlin's config settings](http://marlinfw.org/docs/configuration/configuration.html).
-* **Perform a [cursory search](https://github.com/MarlinFirmware/Marlin/issues?q=is%3Aissue)** to see if the enhancement has already been suggested. If it has, add a comment to the existing issue instead of opening a new one.
+- **Check the [Marlin website](https://marlinfw.org/)** for tips — you might discover that the feature is already included. Most importantly, check if you're using [the latest version of Marlin](https://github.com/MarlinFirmware/Marlin/releases) and if you can get the desired behavior by changing [Marlin's config settings](https://marlinfw.org/docs/configuration/configuration.html).
+- **Perform a [cursory search](https://github.com/MarlinFirmware/Marlin/issues?q=is%3Aopen+is%3Aissue+label%3A%22T%3A+Feature+Request%22)** to see if the enhancement has already been suggested. If it has, add a comment to the existing issue instead of opening a new one.
 
 #### How Do I Submit A (Good) Feature Request?
 
 Feature Requests are tracked as [GitHub issues](https://guides.github.com/features/issues/). Please follow these guidelines in your request:
 
-* **Use a clear and descriptive title** for the issue to identify the suggestion.
-* **Provide a step-by-step description of the requested feature** in as much detail as possible.
-* **Provide specific examples to demonstrate the steps**.
-* **Describe the current behavior** and **explain which behavior you expected to see instead** and why.
-* **Include screenshots and links to videos** which demonstrate the feature or point out the part of Marlin to which the request is related.
-* **Explain why this feature would be useful** to most Marlin users.
-* **Name other firmwares that have this feature, if any.**
+- **Use a clear and descriptive title** for the issue to identify the suggestion.
+- **Provide a step-by-step description of the requested feature** in as much detail as possible.
+- **Provide specific examples to demonstrate the steps**.
+- **Describe the current behavior** and **explain which behavior you expected to see instead** and why.
+- **Include screenshots and links to videos** which demonstrate the feature or point out the part of Marlin to which the request is related.
+- **Explain why this feature would be useful** to most Marlin users.
+- **Name other firmwares that have this feature, if any.**
 
 ### Your First Code Contribution
 
 Unsure where to begin contributing to Marlin? You can start by looking through these `good-first-issue` and `help-wanted` issues:
 
-* [Beginner issues][good-first-issue] - issues which should only require a few lines of code, and a test or two.
-* [Help Wanted issues][help-wanted] - issues which should be a bit more involved than `beginner` issues.
+- [Beginner issues][good-first-issue] - issues which should only require a few lines of code, and a test or two.
+- [Help Wanted issues][help-wanted] - issues which should be a bit more involved than `beginner` issues.
 
 ### Pull Requests
 
-Pull Requests should always be targeted to working branches (e.g., `bugfix-1.1.x` and/or `bugfix-2.0.x`) and never to release branches (e.g., `1.1.x`). If this is your first Pull Request, please read our [Guide to Pull Requests](http://marlinfw.org/docs/development/getting_started_pull_requests.html) and Github's [Pull Request](https://help.github.com/articles/creating-a-pull-request/) documentation.
+Pull Requests should always be targeted to working branches (e.g., `bugfix-2.1.x` and/or `bugfix-1.1.x`) and never to release branches (e.g., `2.0.x` and/or `1.1.x`). If this is your first Pull Request, please read our [Guide to Pull Requests](https://marlinfw.org/docs/development/getting_started_pull_requests.html) and GitHub's [Pull Request](https://help.github.com/articles/creating-a-pull-request/) documentation.
 
-* Fill in [the required template](pull_request_template.md).
-* Don't include issue numbers in the PR title.
-* Include pictures, diagrams, and links to videos in your Pull Request to demonstrate your changes, if needed.
-* Follow the [Coding Standards](http://marlinfw.org/docs/development/coding_standards.html) posted on our website.
-* Document new code with clear and concise comments.
-* End all files with a newline.
+- Fill in [the required template](pull_request_template.md).
+- Don't include issue numbers in the PR title.
+- Include pictures, diagrams, and links to videos in your Pull Request to demonstrate your changes, if needed.
+- Follow the [Coding Standards](https://marlinfw.org/docs/development/coding_standards.html) posted on our website.
+- Document new code with clear and concise comments.
+- End all files with a newline.
 
 ## Styleguides
 
 ### Git Commit Messages
 
-* Use the present tense ("Add feature" not "Added feature").
-* Use the imperative mood ("Move cursor to..." not "Moves cursor to...").
-* Limit the first line to 72 characters or fewer.
-* Reference issues and Pull Requests liberally after the first line.
+- Use the present tense ("Add feature" not "Added feature").
+- Use the imperative mood ("Move cursor to..." not "Moves cursor to...").
+- Limit the first line to 72 characters or fewer.
+- Reference issues and Pull Requests liberally after the first line.
 
 ### C++ Coding Standards
 
-* Please read and follow the [Coding Standards](http://marlinfw.org/docs/development/coding_standards.html) posted on our website. Failure to follow these guidelines will delay evaluation and acceptance of Pull Requests.
+- Please read and follow the [Coding Standards](https://marlinfw.org/docs/development/coding_standards.html) posted on our website. Failure to follow these guidelines will delay evaluation and acceptance of Pull Requests.
 
 ### Documentation
 
-* Guidelines for documentation are still under development. In-general, be clear, concise, and to-the-point.
+- Guidelines for documentation are still under development. In-general, be clear, concise, and to-the-point.

.github/issue_template.md

@@ -1,16 +0,0 @@
-# NO SUPPORT REQUESTS PLEASE
-
-Support Requests posted here will be automatically closed!
-
-This Issue Queue is for Marlin bug reports and development-related issues, and we prefer not to handle user-support questions here. See https://github.com/MarlinFirmware/Marlin/blob/1.1.x/.github/contributing.md#i-dont-want-to-read-this-whole-thing-i-just-have-a-question.
-
-For best results getting help with configuration and troubleshooting, please use the following resources:
-
-- RepRap.org Marlin Forum http://forums.reprap.org/list.php?415
-- Tom's 3D Forums https://discuss.toms3d.org/
-- Facebook Group "Marlin Firmware" https://www.facebook.com/groups/1049718498464482/
-- Facebook Group "Marlin Firmware for 3D Printers" https://www.facebook.com/groups/3Dtechtalk/
-- Marlin Configuration https://www.youtube.com/results?search_query=marlin+configuration on YouTube
-- Marlin Discord server. Join link: https://discord.gg/n5NJ59y
-
-After seeking help from the community, if the consensus points to to a bug in Marlin, then you should post a Bug Report at https://github.com/MarlinFirmware/Marlin/issues/new/choose).

.github/pull_request_template.md

@@ -1,19 +1,33 @@
-### Requirements
+<!--
 
-* Filling out this template is required. Pull Requests without a clear description may be closed at the maintainers' discretion.
+Submitting a Pull Request
+
+- Please fill out all sections of this form. You can delete the helpful comments.
+- Pull Requests without clear information will take longer and may even be rejected.
+- We get a high volume of submissions so please be patient during review.
+
+-->
 
 ### Description
 
 <!--
 
-We must be able to understand your proposed change from this description. If we can't understand what the code will do from this description, the Pull Request may be closed at the maintainers' discretion. Keep in mind that the maintainer reviewing this PR may not be familiar with or have worked with the code recently, so please walk us through the concepts.
+Clearly describe the submitted changes with lots of details. Include images where helpful. Initial reviewers may not be familiar with the subject, so be as thorough as possible. You can use MarkDown syntax to improve readability with bullet lists, code blocks, and so on. PREVIEW and fix up formatting before submitting.
 
 -->
 
+### Requirements
+
+<!-- Does this PR require a specific board, LCD, etc.? -->
+
 ### Benefits
 
-<!-- What does this fix or improve? -->
+<!-- What does this PR fix or improve? -->
+
+### Configurations
+
+<!-- Attach Configurations ZIP and any other files needed to test this PR. -->
 
 ### Related Issues
 
-<!-- Whether this fixes a bug or fulfills a feature request, please list any related Issues here. -->
+<!-- Does this PR fix a bug or fulfill a Feature Request? Link related Issues here. -->

.github/workflows/auto-label.yml

@@ -0,0 +1,41 @@
+#
+# auto-label.yml
+# - Find all open issues without a label and a title containing "[BUG]".
+# - Apply the label "Bug: Potential ?" to these issues.
+#
+
+name: Label Old Bugs
+
+on:
+  schedule:
+  - cron: "30 8 * * *"
+
+jobs:
+  autolabel:
+    name: Auto Label
+    if: github.repository == 'MarlinFirmware/Marlin'
+    runs-on: ubuntu-22.04
+    steps:
+    - name: Auto Label for [BUG]
+      uses: actions/github-script@v7
+      with:
+        script: |
+          // Get all open issues in this repository
+          const issueList = await github.rest.issues.listForRepo({
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            state: 'open'
+          });
+          // Filter issues without labels that have a title containing '[BUG]'.
+          const matchingIssues = issueList.data.filter(
+            issue => issue.title.includes('[BUG]') && issue.labels.length === 0
+          );
+          // Process the first 50
+          for (const issue of matchingIssues.slice(0, 50)) {
+            await github.rest.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: issue.number,
+              labels: ['Bug: Potential ?']
+            });
+          }

.github/workflows/bad-target.md

@@ -1,7 +0,0 @@
-Thanks for your contribution! Unfortunately we can't accept PRs directed at release branches. We make patches to the bugfix branches and only later do we push them out as releases.
-
-Please redo this PR starting with the `bugfix-2.0.x` branch and be careful to target `bugfix-2.0.x` when resubmitting the PR.
-
-It may help to set your fork's default branch to `bugfix-2.0.x`.
-
-See [this page](http://marlinfw.org/docs/development/getting_started_pull_requests.html) for full instructions.

.github/workflows/bump-date.yml

@@ -7,28 +7,53 @@ name: Bump Distribution Date
 
 on:
   schedule:
-    - cron: '0 0 * * *'
+    - cron: '0 */6 * * *'
 
 jobs:
   bump_date:
+    name: Bump Distribution Date
+    if: github.repository == 'MarlinFirmware/Marlin'
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
 
     - name: Check out bugfix-2.0.x
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         ref: bugfix-2.0.x
 
-    - name: Bump Distribution Date
+    - name: Bump Date (bugfix-2.0.x)
       run: |
         # Inline Bump Script
-        [[ "$GITHUB_REPOSITORY" == "MarlinFirmware/Marlin" ]] || exit 0
-        DIST=$( date +"%Y-%m-%d" )
-        eval "sed -E -i 's/(#define +STRING_DISTRIBUTION_DATE) .*$/\1 \"$DIST\"/g' Marlin/src/inc/Version.h" && \
-        git config user.name "${GITHUB_ACTOR}" && \
-        git config user.email "${GITHUB_ACTOR}@users.noreply.github.com" && \
-        git add . && \
-        git commit -m "[cron] Bump distribution date ($DIST)" && \
-        git push
+        if [[ ! "$( git log -1 --pretty=%B )" =~ ^\[cron\] ]]; then
+          DIST=$( date +"%Y-%m-%d" )
+          eval "sed -E -i 's/(#define +STRING_DISTRIBUTION_DATE) .*$/\1 \"$DIST\"/g' Marlin/src/inc/Version.h" && \
+          eval "sed -E -i 's/(#define +STRING_DISTRIBUTION_DATE) .*$/\1 \"$DIST\"/g' Marlin/Version.h" && \
+          git config user.name "${GITHUB_ACTOR}" && \
+          git config user.email "${GITHUB_ACTOR}@users.noreply.github.com" && \
+          git add . && \
+          git commit -m "[cron] Bump distribution date ($DIST)" && \
+          git push
+        fi
+        exit 0
+
+    - name: Check out bugfix-2.1.x
+      uses: actions/checkout@v4
+      with:
+        ref: bugfix-2.1.x
+
+    - name: Bump Date (bugfix-2.1.x)
+      run: |
+        # Inline Bump Script
+        if [[ ! "$( git log -1 --pretty=%B )" =~ ^\[cron\] ]]; then
+          DIST=$( date +"%Y-%m-%d" )
+          eval "sed -E -i 's/(#define +STRING_DISTRIBUTION_DATE) .*$/\1 \"$DIST\"/g' Marlin/src/inc/Version.h" && \
+          eval "sed -E -i 's/(#define +STRING_DISTRIBUTION_DATE) .*$/\1 \"$DIST\"/g' Marlin/Version.h" && \
+          git config user.name "${GITHUB_ACTOR}" && \
+          git config user.email "${GITHUB_ACTOR}@users.noreply.github.com" && \
+          git add . && \
+          git commit -m "[cron] Bump distribution date ($DIST)" && \
+          git push
+        fi
+        exit 0

.github/workflows/check-pr.yml

@@ -1,12 +1,13 @@
 #
-# comment-pr.yml
-# Add a comment to any PR directed to a release branch
+# check-pr.yml
+# Close PRs directed at release branches
 #
 
 name: PR Bad Target
 
 on:
-  pull_request:
+  pull_request_target:
+    types: [opened]
     branches:
     - 1.0.x
     - 1.1.x
@@ -14,14 +15,19 @@ on:
 
 jobs:
   bad_target:
-
     name: PR Bad Target
-    runs-on: ubuntu-latest
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@v1
-      - uses: harupy/comment-on-pr@master
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          filename: bad-target.md
+    - uses: superbrothers/close-pull-request@v3
+      with:
+        comment: >
+          Thanks for your contribution! Unfortunately we can't accept PRs directed at release branches. We make patches to the bugfix branches and only later do we push them out as releases.
+
+          Please redo this PR starting with the `bugfix-2.1.x` branch and be careful to target `bugfix-2.1.x` when resubmitting the PR. Patches may also target `bugfix-2.0.x` if they are specifically for 2.0.9.x.
+
+          It may help to set your fork's default branch to `bugfix-2.1.x`.
+
+          See [this page](https://marlinfw.org/docs/development/getting_started_pull_requests.html) for full instructions.

.github/workflows/ci-build-tests.yml

@@ -0,0 +1,214 @@
+#
+# ci-build-tests.yml
+# Do test builds to catch compile errors
+#
+
+name: CI - Build Tests
+
+on:
+  pull_request:
+    branches:
+    - bugfix-2.1.x
+    - 2.1.x
+    paths-ignore:
+    - config/**
+    - data/**
+    - docs/**
+    - test/**
+    - Marlin/tests/**
+    - '**/*.md'
+  push:
+    branches:
+    - bugfix-2.1.x
+    - 2.1.x
+    - release-*
+    paths-ignore:
+    - config/**
+    - data/**
+    - docs/**
+    - test/**
+    - Marlin/tests/**
+    - '**/*.md'
+
+jobs:
+  test_builds:
+    name: Build Test
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-22.04
+
+    env:
+      CONFIG_BRANCH: ${{ github.base_ref || github.ref_name }}
+
+    strategy:
+      fail-fast: true
+      matrix:
+        test-platform:
+
+        # RP2040
+        - SKR_Pico
+
+        # Native
+        - linux_native
+        - simulator_linux_release
+
+        # AVR
+        - mega2560
+        - mega1280
+        - at90usb1286_dfu
+
+        # AVR Extended
+        - mega2560ext
+        - melzi_optiboot
+        - rambo
+        - sanguino1284p
+        - sanguino644p
+
+        # SAM3X8E
+        - DUE
+        - DUE_archim
+
+        # SAMD21
+        - SAMD51_grandcentral_m4
+        - SAMD21_minitronics20
+
+        # ESP32
+        - esp32
+        - mks_tinybee
+
+        # Teensy 2
+        #- at90usb1286_cdc
+
+        # Teensy MK20DX256
+        - teensy31
+
+        # Teensy MK64FX512, MK66FX1M0
+        - teensy35
+
+        # Teensy IMXRT1062DVx6A
+        - teensy41
+
+        # STM32F0
+        - malyan_M300
+        - STM32F070CB_malyan
+        - STM32F070RB_malyan
+
+        # STM32F1
+        - chitu_f103
+        - mks_robin
+        - mks_robin_nano_v1v2
+        - PANDA_PI_V29
+        - STM32F103RC_btt
+        - STM32F103RC_fysetc
+        - STM32F103RE_btt
+        - STM32F103RE_btt_USB
+        - STM32F103RE_creality
+        - STM32F103VE_longer
+        #- mks_robin_mini
+        #- mks_robin_nano_v1_3_f4_usbmod
+        #- mks_robin_nano_v1v2_usbmod
+        #- STM32F103CB_malyan
+        #- STM32F103RC_btt_USB
+        #- STM32F103RE
+
+        # STM32F4
+        - ARMED
+        - BTT_BTT002
+        - BTT_GTR_V1_0
+        - BTT_SKR_PRO
+        - FLYF407ZG
+        - STM32F446VE_fysetc
+        - LERDGEK
+        - LERDGEX
+        - mks_robin_pro2
+        - Opulo_Lumen_REV3
+        - rumba32
+        - STM32F401RC_creality
+        - STM32F407VE_black
+        - I3DBEEZ9_V1
+
+        # STM32F7
+        - NUCLEO_F767ZI
+        - REMRAM_V1
+
+        # STM32H7
+        - BTT_SKR_SE_BX
+        - STM32H743VI_btt
+
+        # STM32F1 (Maple)
+        - jgaurora_a5s_a1_maple
+        - mks_robin_lite_maple
+        - mks_robin_pro_maple
+        - STM32F103RC_btt_USB_maple
+        - STM32F103RC_fysetc_maple
+        - STM32F103RC_meeb_maple
+        - STM32F103VE_longer_maple
+        - STM32F103VE_ZM3E4V2_USB_maple
+        #- mks_robin_maple
+        #- mks_robin_nano_v1v2_maple
+        #- STM32F103RC_btt_maple
+        #- STM32F103RE_creality_maple
+
+        # STM32G0
+        - STM32G0B1RE_btt
+
+        # HC32
+        - HC32F460C_aquila_101
+
+        # GD32F3
+        - GD32F303RE_creality_mfl
+
+        # GD32F1
+        - GD32F103RC_aquila_mfl
+
+        # LPC176x - Lengthy tests
+        - LPC1768
+        - LPC1769
+
+    steps:
+
+    - name: Check out the PR
+      uses: actions/checkout@v4
+
+    - name: Cache pip
+      uses: actions/cache@v4
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-build-v1
+        restore-keys: |
+          ${{ runner.os }}-pip-build-
+
+    - name: Cache PlatformIO
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.platformio
+          .pio/build
+          .pio/libdeps
+        key: ${{ runner.os }}-pio-build-v1
+        restore-keys: |
+          ${{ runner.os }}-pio-build-
+
+    - name: Select Python 3.9
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.9'
+        architecture: 'x64'
+
+    - name: Install PlatformIO
+      run: |
+        pip install -U platformio
+        pio upgrade --dev
+        pio pkg update --global
+
+    - name: Install Simulator dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install build-essential
+        sudo apt-get install libsdl2-dev
+        sudo apt-get install libsdl2-net-dev
+        sudo apt-get install libglm-dev
+
+    - name: Run ${{ matrix.test-platform }} Tests
+      run: |
+        make tests-single-ci TEST_TARGET=${{ matrix.test-platform }}

.github/workflows/ci-unit-tests.yml

@@ -0,0 +1,78 @@
+#
+# ci-unit-tests.yml
+# Build and execute unit tests to catch functional issues in code
+#
+
+name: CI - Unit Tests
+
+on:
+  pull_request:
+    branches:
+    - bugfix-2.1.x
+    # Cannot be enabled on 2.1.x until it contains the unit test framework
+    #- 2.1.x
+    paths-ignore:
+    - config/**
+    - data/**
+    - docs/**
+    - '**/*.md'
+  push:
+    branches:
+    - bugfix-2.1.x
+    # Cannot be enabled on 2.1.x until it contains the unit test framework
+    #- 2.1.x
+    paths-ignore:
+    - config/**
+    - data/**
+    - docs/**
+    - '**/*.md'
+
+jobs:
+  # This runs all unit tests as a single job. While it should be possible to break this up into
+  # multiple jobs, they currently run quickly and finish long before the compilation tests.
+  run_unit_tests:
+    name: Unit Test
+    # These tests will only be able to run on the bugfix-2.1.x branch, until the next release
+    # pulls them into additional branches.
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-22.04
+
+    steps:
+    - name: Check out the PR
+      uses: actions/checkout@v4
+
+    - name: Cache pip
+      uses: actions/cache@v4
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-unit-v1
+        restore-keys: |
+          ${{ runner.os }}-pip-unit-
+
+    - name: Cache PlatformIO
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.platformio
+          .pio/build
+          .pio/libdeps
+        key: ${{ runner.os }}-pio-tests-v1
+        restore-keys: |
+          ${{ runner.os }}-pio-tests-
+
+    - name: Select Python 3.9
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.9'
+        architecture: 'x64'
+
+    - name: Install PlatformIO
+      run: |
+        pip install -U platformio
+        pio upgrade --dev
+        pio pkg update --global
+
+    - name: Run All Unit Tests
+      run: |
+        make unit-test-all-local

.github/workflows/ci-validate-boards.yml

@@ -0,0 +1,48 @@
+#
+# ci-validate-boards.yml
+# Validate boards.h to make sure it's all set up correctly
+#
+
+name: CI - Validate boards.h
+
+# We can do the on: section as two items, one for pull requests and one for pushes...
+on:
+  pull_request:
+    branches:
+      - bugfix-2.1.x
+    paths:
+      - "Marlin/src/core/boards.h"
+  push:
+    branches:
+      - bugfix-2.1.x
+    paths:
+      - "Marlin/src/core/boards.h"
+
+jobs:
+  validate_pins_files:
+    name: Validate boards.h
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Check out the PR
+        uses: actions/checkout@v4
+
+      - name: Cache pip
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-validation-v1
+          restore-keys: |
+            ${{ runner.os }}-pip-validation-
+
+      - name: Select Python 3.9
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.9"
+          architecture: "x64"
+
+      - name: Validate core/boards.h
+        run: |
+          make validate-boards -j

.github/workflows/ci-validate-lines.yml

@@ -0,0 +1,40 @@
+#
+# ci-validate-lines.yml
+# Validate that all text files are unchanged by linesformat.py
+#
+
+name: CI - Validate Source Files
+
+on:
+  pull_request:
+    branches:
+      - bugfix-2.1.x
+      - 2.1.x
+  push:
+    branches:
+      - bugfix-2.1.x
+      - 2.1.x
+
+jobs:
+  validate_source_files:
+    name: Validate Source Files
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Check out the PR
+        uses: actions/checkout@v4
+
+      - name: Cache node_modules
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-npm-lines-v1
+          restore-keys: |
+            ${{ runner.os }}-npm-lines-
+
+      - name: Validate text file formatting
+        run: |
+          npm install --save-dev prettier
+          make validate-lines -j

.github/workflows/ci-validate-pins.yml

@@ -0,0 +1,51 @@
+#
+# ci-validate-pins.yml
+# Validate that all of the pins files are unchanged by pinsformat.py
+#
+
+name: CI - Validate Pins Files
+
+on:
+  pull_request:
+    branches:
+      - bugfix-2.1.x
+    # Cannot be enabled on 2.1.x until it contains the unit test framework
+    #- 2.1.x
+    paths:
+      - "Marlin/src/pins/*/**"
+  push:
+    branches:
+      - bugfix-2.1.x
+    # Cannot be enabled on 2.1.x until it contains the unit test framework
+    #- 2.1.x
+    paths:
+      - "Marlin/src/pins/*/**"
+
+jobs:
+  validate_pins_files:
+    name: Validate Pins Files
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Check out the PR
+        uses: actions/checkout@v4
+
+      - name: Cache pip
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-validation-v1
+          restore-keys: |
+            ${{ runner.os }}-pip-validation-
+
+      - name: Select Python 3.9
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.9"
+          architecture: "x64"
+
+      - name: Validate all pins files
+        run: |
+          make validate-pins -j

.github/workflows/clean-closed.yml

@@ -0,0 +1,40 @@
+#
+# clean-closed.yml
+# Remove obsolete labels when an Issue or PR is closed
+#
+
+name: Clean Closed
+
+on:
+  pull_request:
+    types: [closed]
+  issues:
+    types: [closed]
+
+jobs:
+  remove_label:
+    runs-on: ubuntu-22.04
+
+    strategy:
+      matrix:
+        label:
+          - "S: Don't Merge"
+          - "S: Hold for 2.1"
+          - "S: Please Merge"
+          - "S: Please Test"
+          - "help wanted"
+          - "Bug: Potential ?"
+          - "Needs: Discussion"
+          - "Needs: Documentation"
+          - "Needs: More Data"
+          - "Needs: Patch"
+          - "Needs: Testing"
+          - "Needs: Work"
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Remove Labels
+        uses: actions-ecosystem/action-remove-labels@v1
+        with:
+          github_token: ${{ github.token }}
+          labels: ${{ matrix.label }}

.github/workflows/close-stale.yml

@@ -0,0 +1,40 @@
+#
+# close-stale.yml
+# Close open issues after a period of inactivity
+#
+
+name: Close Stale Issues
+
+on:
+  schedule:
+  - cron: "22 1 * * *"
+
+jobs:
+  stale:
+    name: Close Stale Issues
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-22.04
+
+    steps:
+    - uses: actions/stale@v9
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: |
+          Greetings from the Marlin AutoBot!
+          This issue has had no activity for the last 90 days.
+          Do you still see this issue with the latest `bugfix-2.1.x` code?
+          Please add a reply within 14 days or this issue will be automatically closed.
+          To keep a confirmed issue open we can also add a "Bug: Confirmed" tag.
+
+          Disclaimer: This is an open community project with lots of activity and limited
+          resources. The main project contributors will do a bug sweep ahead of the next
+          release, but any skilled member of the community may jump in at any time to fix
+          this issue. That can take a while depending on our busy lives so please be patient,
+          and take advantage of other resources such as the MarlinFirmware Discord to help
+          solve the issue.
+        days-before-stale: 90
+        days-before-close: 14
+        stale-issue-label: 'stale-closing-soon'
+        exempt-all-assignees: true
+        exempt-issue-labels: 'Bug: Confirmed !,T: Feature Request,Needs: More Data,Needs: Discussion,Needs: Documentation,Needs: Patch,Needs: Work,Needs: Testing,help wanted,no-locking'

.github/workflows/lock-closed.yml

@@ -0,0 +1,32 @@
+#
+# lock-closed.yml
+# Lock closed issues after a period of inactivity
+#
+
+name: Lock Closed Issues
+
+on:
+  schedule:
+    - cron: '0 1/13 * * *'
+
+jobs:
+  lock:
+    name: Lock Closed Issues
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-22.04
+
+    steps:
+    - uses: dessant/lock-threads@v5
+      with:
+        github-token: ${{ github.token }}
+        process-only: 'issues'
+        issue-inactive-days: '60'
+        exclude-issue-created-before: ''
+        exclude-any-issue-labels: 'no-locking'
+        add-issue-labels: ''
+        issue-comment: >
+          This issue has been automatically locked since there
+          has not been any recent activity after it was closed.
+          Please open a new issue for related bugs.
+        issue-lock-reason: ''

.github/workflows/test-builds.yml

@@ -1,103 +0,0 @@
-#
-# test-builds.yml
-# Do test builds to catch compile errors
-#
-
-name: CI
-
-on:
-  pull_request:
-    branches:
-    - bugfix-2.0.x
-    - dev-2.1.x
-    paths-ignore:
-    - config/**
-    - data/**
-    - docs/**
-    - '**/*.md'
-
-jobs:
-  test_builds:
-
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        test-platform:
-        # Base Environments
-
-        - DUE
-        - esp32
-        - linux_native
-        - megaatmega2560
-        - teensy31
-        - teensy35
-        - SAMD51_grandcentral_m4
-
-        # Extended AVR Environments
-
-        - FYSETC_F6_13
-        - megaatmega1280
-        - rambo
-        - sanguino_atmega1284p
-        - sanguino_atmega644p
-
-        # Extended STM32 Environments
-
-        - STM32F103RC_bigtree
-        - STM32F103RC_bigtree_USB
-        - STM32F103RE_bigtree
-        - STM32F103RE_bigtree_USB
-        - STM32F103RC_fysetc
-        - jgaurora_a5s_a1
-        - STM32F103VE_longer
-        - STM32F407VE_black
-        - BIGTREE_SKR_PRO
-        - mks_robin
-        - ARMED
-        - FYSETC_S6
-
-        # Put lengthy tests last
-
-        - LPC1768
-        - LPC1769
-
-        # STM32 with non-STM framework. both broken for now. they should use HAL_STM32 which is working.
-
-        #- STM32F4
-        #- STM32F7
-
-        # Non-working environment tests
-
-        #- BIGTREE_BTT002
-        #- at90usb1286_cdc
-        #- at90usb1286_dfu
-        #- STM32F103CB_malyan
-        #- mks_robin_lite
-        #- mks_robin_mini
-        #- mks_robin_nano
-
-    steps:
-
-    - name: Select Python 3.7
-      uses: actions/setup-python@v1
-      with:
-        python-version: '3.7' # Version range or exact version of a Python version to use, using semvers version range syntax.
-        architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
-
-    - name: Install PlatformIO
-      run: |
-        pip install -U https://github.com/platformio/platformio-core/archive/master.zip
-        platformio update
-
-    - name: Check out the PR
-      uses: actions/checkout@v2
-
-    - name: Run ${{ matrix.test-platform }} Tests
-      run: |
-        # Inline tests script
-        [[ "$GITHUB_REPOSITORY" == "MarlinFirmware/Marlin" ]] || exit 0
-        chmod +x buildroot/bin/*
-        chmod +x buildroot/share/tests/*
-        export PATH=./buildroot/bin/:./buildroot/share/tests/:${PATH}
-        run_tests . ${{ matrix.test-platform }}

.github/workflows/unlock-reopened.yml

@@ -0,0 +1,22 @@
+#
+# unlock-reopened.yml
+# Unlock an issue whenever it is re-opened
+#
+
+name: "Unlock reopened issue"
+
+on:
+  issues:
+    types: [reopened]
+
+jobs:
+  unlock:
+    name: Unlock Reopened
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-22.04
+
+    steps:
+    - uses: OSDKDev/unlock-issues@v1.1
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"

.gitignore

@@ -16,37 +16,31 @@
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #
 
-# Our automatic versioning scheme generates the following file
-# NEVER put it in the repository
+# Generated files
 _Version.h
+bdf2u8g.exe
+genpages.exe
+marlin_config.json
+mczip.h
+language*.csv
+out-csv/
+out-language/
+*.gen
+*.sublime-workspace
+
+# npm
+node_modules/
+package.json
+package-lock.json
 
-#
 # OS
-#
 applet/
-*.DS_Store
+.DS_Store
 
-#
-# Misc
-#
-*~
-*.orig
-*.rej
-*.bak
-*.idea
-*.s
-*.i
-*.ii
-*.swp
-tags
-
-#
-# C++
-#
-# Compiled Object files
+# Compiled C++ Object files
 *.slo
 *.lo
 *.o
@@ -77,11 +71,7 @@ tags
 *.out
 *.app
 
-
-#
-# C
-#
-# Object files
+# Compiled C Object files
 *.o
 *.ko
 *.obj
@@ -123,33 +113,10 @@ tags
 .gcc-flags.json
 /lib/
 
-# Workaround for Deviot+platformio quirks
-Marlin/lib
-Marlin/platformio.ini
-Marlin/*/platformio.ini
-Marlin/*/*/platformio.ini
-Marlin/*/*/*/platformio.ini
-Marlin/*/*/*/*/platformio.ini
-Marlin/.travis.yml
-Marlin/*/.travis.yml
-Marlin/*/*/.travis.yml
-Marlin/*/*/*/.travis.yml
-Marlin/*/*/*/*/.travis.yml
-Marlin/.gitignore
-Marlin/*/.gitignore
-Marlin/*/*/.gitignore
-Marlin/*/*/*/.gitignore
-Marlin/*/*/*/*/.gitignore
-Marlin/readme.txt
-Marlin/*/readme.txt
-Marlin/*/*/readme.txt
-Marlin/*/*/*/readme.txt
-Marlin/*/*/*/*/readme.txt
-
 # Secure Credentials
 Configuration_Secure.h
 
-#Visual Studio
+# Visual Studio
 *.sln
 *.vcxproj
 *.vcxproj.user
@@ -160,27 +127,53 @@ __vm/
 .vs/
 vc-fileutils.settings
 
-#Visual Studio Code
-.vscode
-.vscode/.browse.c_cpp.db*
-.vscode/c_cpp_properties.json
-.vscode/launch.json
-.vscode/*.db
+# Visual Studio Code
+.vscode/*
+!.vscode/extensions.json
+*.code-workspace
 
-#cmake
+# Simulation files
+imgui.ini
+eeprom.dat
+spi_flash.bin
+fs.img
+
+# CMake
+buildroot/share/cmake/*
 CMakeLists.txt
+!buildroot/share/cmake/CMakeLists.txt
 src/CMakeLists.txt
 CMakeListsPrivate.txt
+build/
 
-#CLion
+# CLion
 cmake-build-*
 
-#Eclipse
+# Eclipse
 .project
 .cproject
 .pydevproject
 .settings
 .classpath
 
-#Python
+# Python
 __pycache__
+
+# IOLogger logs
+*_log.csv
+
+# Misc.
+*~
+*.orig
+*.rej
+*.bak
+*.idea
+*.i
+*.ii
+*.swp
+tags
+*.logs
+*.bak
+.aider*
+!.aiderignore
+.env

.prettierignore

@@ -0,0 +1,10 @@
+# Prettier Ignore file
+*.min.js
+web-ui/
+buildroot/share/PlatformIO/boards
+buildroot/share/PlatformIO/variants
+*.sublime-project
+*.sublime-syntax
+.github
+.vscode
+launch.json

.vscode/extensions.json

@@ -0,0 +1,12 @@
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "marlinfirmware.auto-build",
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode-remote.remote-containers",
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

.zed/settings.json

@@ -0,0 +1,16 @@
+/**
+ * Marlin-specific settings for Zed
+ *
+ * For a full list of overridable settings, and general information on folder-specific settings,
+ * see the documentation: https://zed.dev/docs/configuring-zed#settings-files
+ */
+{
+  "languages": {
+    "C": {
+      "enable_language_server": false
+    },
+    "C++": {
+      "enable_language_server": false
+    }
+  }
+}

LICENSE

@@ -3,7 +3,7 @@
                     GNU GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
 
- Copyright (c) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Copyright (c) 2007 Free Software Foundation, Inc. <https://www.fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
@@ -647,7 +647,7 @@ the "copyright" line and a pointer to where the full notice is found.
     GNU General Public License for more details.
 
     You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 Also add information on how to contact you by electronic and paper mail.
 
@@ -666,12 +666,11 @@ might be different; for a GUI interface, you would use an "about box".
   You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
+<https://www.gnu.org/licenses/>.
 
   The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
-
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

Makefile

@@ -0,0 +1,176 @@
+SCRIPTS_DIR := buildroot/share/scripts
+MAKESCRIPTS_DIR := buildroot/share/make
+CONTAINER_RT_BIN := docker
+CONTAINER_RT_OPTS := --rm -v $(PWD):/code -v platformio-cache:/root/.platformio
+CONTAINER_IMAGE := marlin-dev
+UNIT_TEST_CONFIG ?= default
+
+# Find a Python 3 interpreter
+ifeq ($(OS),Windows_NT)
+	# Windows: use `where` – fall back through the three common names
+	PYTHON := $(shell which python 2>nul || which python3 2>nul || which py 2>nul)
+	# Windows: Use Python script to find pins files
+	PINS := $(shell $(PYTHON) $(MAKESCRIPTS_DIR)/find.py Marlin/src/pins -mindepth 2 -name 'pins_*.h')
+else
+	# POSIX: use `command -v` – prefer python3 over python
+	PYTHON := $(shell command -v python3 2>/dev/null || command -v python 2>/dev/null)
+	# Unix/Linux: Use find command
+	PINS := $(shell find Marlin/src/pins -mindepth 2 -name 'pins_*.h')
+endif
+
+# Check that the found interpreter is Python 3
+# Error if there's no Python 3 available
+ifneq ($(strip $(PYTHON)),)
+	PYTHON_VERSION := $(shell $(PYTHON) -c "import sys; print(sys.version_info[0])" 2>/dev/null)
+	ifneq ($(PYTHON_VERSION),3)
+		$(error $(PYTHON) is not Python 3 – install a Python‑3.x interpreter or adjust your PATH)
+	endif
+else
+	$(error No Python executable found – install Python 3.x and make sure it is in your PATH)
+endif
+
+help:
+	@echo "Tasks for local development:"
+	@echo "make marlin                    : Build Marlin for the configured board"
+	@echo "make format-pins -j            : Reformat all pins files (-j for parallel execution)"
+	@echo "make validate-lines -j         : Validate line endings, fails on trailing whitespace, etc."
+	@echo "make validate-pins -j          : Validate all pins files, fails if any require reformatting"
+	@echo "make validate-boards -j        : Validate boards.h and pins.h for standards compliance"
+	@echo "make validate-urls             : Validate URLs in source files"
+	@echo "make tests-single-ci           : Run a single test from inside the CI"
+	@echo "make tests-single-local        : Run a single test locally"
+	@echo "make tests-single-local-docker : Run a single test locally, using docker"
+	@echo "make tests-all-local           : Run all tests locally"
+	@echo "make tests-all-local-docker    : Run all tests locally, using docker"
+	@echo "make unit-test-single-local    : Run unit tests for a single config locally"
+	@echo "make unit-test-single-local-docker : Run unit tests for a single config locally, using docker"
+	@echo "make unit-test-all-local       : Run all code tests locally"
+	@echo "make unit-test-all-local-docker : Run all code tests locally, using docker"
+	@echo "make setup-local-docker        : Setup local docker"
+	@echo ""
+	@echo "Options for testing:"
+	@echo "  TEST_TARGET          Set when running tests-single-*, to select the"
+	@echo "                       test. If you set it to ALL it will run all "
+	@echo "                       tests, but some of them are broken: use "
+	@echo "                       tests-all-* instead to run only the ones that "
+	@echo "                       run on GitHub CI"
+	@echo "  ONLY_TEST            Limit tests to only those that contain this, or"
+	@echo "                       the index of the test (1-based)"
+	@echo "  UNIT_TEST_CONFIG     Set the name of the config from the test folder, without"
+	@echo "                       the leading number. Default is 'default'". Used with the
+	@echo "                       unit-test-single-* tasks"
+	@echo "  VERBOSE_PLATFORMIO   If you want the full PIO output, set any value"
+	@echo "  GIT_RESET_HARD       Used by CI: reset all local changes. WARNING:"
+	@echo "                       THIS WILL UNDO ANY CHANGES YOU'VE MADE!"
+
+marlin:
+	./buildroot/bin/mftest -a
+.PHONY: marlin
+
+clean:
+	rm -rf .pio/build*
+
+tests-single-ci:
+	export GIT_RESET_HARD=true
+	$(MAKE) tests-single-local TEST_TARGET=$(TEST_TARGET) PLATFORMIO_BUILD_FLAGS=-DGITHUB_ACTION
+
+tests-single-local:
+	@if ! test -n "$(TEST_TARGET)" ; then echo "***ERROR*** Set TEST_TARGET=<your-module> or use make tests-all-local" ; return 1; fi
+	export PATH="./buildroot/bin/:./buildroot/tests/:${PATH}" \
+	  && export VERBOSE_PLATFORMIO=$(VERBOSE_PLATFORMIO) \
+	  && run_tests . $(TEST_TARGET) "$(ONLY_TEST)"
+
+tests-single-local-docker:
+	@if ! test -n "$(TEST_TARGET)" ; then echo "***ERROR*** Set TEST_TARGET=<your-module> or use make tests-all-local-docker" ; return 1; fi
+	@if ! $(CONTAINER_RT_BIN) images -q $(CONTAINER_IMAGE) > /dev/null ; then $(MAKE) setup-local-docker ; fi
+	$(CONTAINER_RT_BIN) run $(CONTAINER_RT_OPTS) $(CONTAINER_IMAGE) make tests-single-local TEST_TARGET=$(TEST_TARGET) VERBOSE_PLATFORMIO=$(VERBOSE_PLATFORMIO) GIT_RESET_HARD=$(GIT_RESET_HARD) ONLY_TEST="$(ONLY_TEST)"
+
+tests-all-local:
+	@$(PYTHON) -c "import yaml" 2>/dev/null || (echo 'pyyaml module is not installed. Install it with "$(PYTHON) -m pip install pyyaml"' && exit 1)
+	export PATH="./buildroot/bin/:./buildroot/tests/:${PATH}" \
+	  && export VERBOSE_PLATFORMIO=$(VERBOSE_PLATFORMIO) \
+	  && for TEST_TARGET in $$($(PYTHON) $(MAKESCRIPTS_DIR)/get_test_targets.py) ; do \
+	    if [ "$$TEST_TARGET" = "linux_native" ] && [ "$$(uname)" = "Darwin" ]; then \
+	      echo "Skipping tests for $$TEST_TARGET on macOS" ; \
+	      continue ; \
+	    fi ; \
+	    echo "Running tests for $$TEST_TARGET" ; \
+	    run_tests . $$TEST_TARGET || exit 1 ; \
+	    sleep 5; \
+	  done
+
+tests-all-local-docker:
+	@if ! $(CONTAINER_RT_BIN) images -q $(CONTAINER_IMAGE) > /dev/null ; then $(MAKE) setup-local-docker ; fi
+	$(CONTAINER_RT_BIN) run $(CONTAINER_RT_OPTS) $(CONTAINER_IMAGE) make tests-all-local VERBOSE_PLATFORMIO=$(VERBOSE_PLATFORMIO) GIT_RESET_HARD=$(GIT_RESET_HARD)
+
+unit-test-single-local:
+	platformio run -t marlin_$(UNIT_TEST_CONFIG) -e linux_native_test
+
+unit-test-single-local-docker:
+	@if ! $(CONTAINER_RT_BIN) images -q $(CONTAINER_IMAGE) > /dev/null ; then $(MAKE) setup-local-docker ; fi
+	$(CONTAINER_RT_BIN) run $(CONTAINER_RT_OPTS)  $(CONTAINER_IMAGE) make unit-test-single-local UNIT_TEST_CONFIG=$(UNIT_TEST_CONFIG)
+
+unit-test-all-local:
+	platformio run -t test-marlin -e linux_native_test
+
+unit-test-all-local-docker:
+	@if ! $(CONTAINER_RT_BIN) images -q $(CONTAINER_IMAGE) > /dev/null ; then $(MAKE) setup-local-docker ; fi
+	$(CONTAINER_RT_BIN) run $(CONTAINER_RT_OPTS)  $(CONTAINER_IMAGE) make unit-test-all-local
+
+USERNAME := $(shell whoami)
+USER_ID  := $(shell id -u)
+GROUP_ID := $(shell id -g)
+
+.PHONY: setup-local-docker setup-local-docker-old
+
+setup-local-docker:
+	@echo "Building marlin-dev Docker image..."
+	$(CONTAINER_RT_BIN) build -t $(CONTAINER_IMAGE) \
+	  --build-arg USERNAME=$(USERNAME) \
+	  --build-arg USER_ID=$(USER_ID) \
+	  --build-arg GROUP_ID=$(GROUP_ID) \
+	  -f docker/Dockerfile .
+	@echo
+	@echo "To run all tests in Docker:"
+	@echo "  make tests-all-local-docker"
+	@echo "To run a single test in Docker:"
+	@echo "  make tests-single-local-docker TEST_TARGET=mega2560"
+
+setup-local-docker-old:
+	$(CONTAINER_RT_BIN) buildx build -t $(CONTAINER_IMAGE) -f docker/Dockerfile .
+
+.PHONY: $(PINS) format-pins validate-pins
+
+$(PINS): %:
+	@echo "Formatting pins $@"
+	@$(PYTHON) $(SCRIPTS_DIR)/pinsformat.py $< $@
+
+format-pins: $(PINS)
+	@echo "Processed $(words $(PINS)) pins files"
+
+validate-pins: format-pins
+	@echo "Validating pins files"
+	@git diff --exit-code || (git status && echo "\nError: Pins files are not formatted correctly. Run \"make format-pins\" to fix.\n" && exit 1)
+
+.PHONY: format-lines validate-lines validate-urls
+
+format-lines:
+	@echo "Formatting all sources"
+	@$(PYTHON) $(SCRIPTS_DIR)/linesformat.py buildroot
+	@$(PYTHON) $(SCRIPTS_DIR)/linesformat.py Marlin
+
+validate-lines:
+	@echo "Validating text formatting"
+	@npx prettier --check . --editorconfig --object-wrap preserve --prose-wrap never
+
+validate-urls:
+	@echo "Checking URLs in source files"
+	@$(MAKESCRIPTS_DIR)/check-urls.sh
+
+BOARDS_FILE := Marlin/src/core/boards.h
+
+.PHONY: validate-boards
+
+validate-boards:
+	@echo "Validating boards.h file"
+	@$(PYTHON) $(MAKESCRIPTS_DIR)/validate_boards.py $(BOARDS_FILE) || (echo "\nError: boards.h file is not valid. Please check and correct it.\n" && exit 1)

Marlin/Makefile

@@ -14,7 +14,7 @@
 # Detailed instructions for using the makefile:
 #
 #  1. Modify the line containing "ARDUINO_INSTALL_DIR" to point to the directory that
-#     contains the Arduino installation (for example, under Mac OS X, this
+#     contains the Arduino installation (for example, under macOS, this
 #     might be /Applications/Arduino.app/Contents/Resources/Java).
 #
 #  2. Modify the line containing "UPLOAD_PORT" to refer to the filename
@@ -22,8 +22,10 @@
 #     (e.g. UPLOAD_PORT = /dev/tty.USB0).  If the exact name of this file
 #     changes, you can use * as a wild card (e.g. UPLOAD_PORT = /dev/tty.usb*).
 #
-#  3. Set the line containing "MCU" to match your board's processor.
-#     Older one's are atmega8 based, newer ones like Arduino Mini, Bluetooth
+#  3. Set the line containing "MCU" to match your board's processor. Set
+#     "PROG_MCU" as the AVR part name corresponding to "MCU". You can use the
+#     following command to get a list of correspondences: `avrdude -c alf -p x`
+#     Older boards are atmega8 based, newer ones like Arduino Mini, Bluetooth
 #     or Diecimila have the atmega168.  If you're using a LilyPad Arduino,
 #     change F_CPU to 8000000. If you are using Gen7 electronics, you
 #     probably need to use 20000000. Either way, you must regenerate
@@ -34,18 +36,18 @@
 #  5. Type "make upload", reset your Arduino board, and press enter to
 #     upload your program to the Arduino board.
 #
-# Note that all settings at the top of this file can be overriden from
+# Note that all settings at the top of this file can be overridden from
 # the command line with, for example, "make HARDWARE_MOTHERBOARD=71"
 #
 # To compile for RAMPS (atmega2560) with Arduino 1.6.9 at root/arduino you would use...
 #
 #   make ARDUINO_VERSION=10609 AVR_TOOLS_PATH=/root/arduino/hardware/tools/avr/bin/ \
-#   HARDWARE_MOTHERBOARD=33 ARDUINO_INSTALL_DIR=/root/arduino
+#   HARDWARE_MOTHERBOARD=1200 ARDUINO_INSTALL_DIR=/root/arduino
 #
 # To compile and upload simply add "upload" to the end of the line...
 #
 #   make ARDUINO_VERSION=10609 AVR_TOOLS_PATH=/root/arduino/hardware/tools/avr/bin/ \
-#   HARDWARE_MOTHERBOARD=33 ARDUINO_INSTALL_DIR=/root/arduino upload
+#   HARDWARE_MOTHERBOARD=1200 ARDUINO_INSTALL_DIR=/root/arduino upload
 #
 # If uploading doesn't work try adding the parameter "AVRDUDE_PROGRAMMER=wiring" or
 # start upload manually (using stk500) like so:
@@ -57,55 +59,80 @@
 #
 
 # This defines the board to compile for (see boards.h for your board's ID)
-HARDWARE_MOTHERBOARD ?= 11
+HARDWARE_MOTHERBOARD ?= 1020
+
+ifeq ($(OS),Windows_NT)
+  # Windows
+  ARDUINO_INSTALL_DIR ?= ${HOME}/AppData/Local/Arduino
+  ARDUINO_USER_DIR ?= ${HOME}/Documents/Arduino
+else
+  UNAME_S := $(shell uname -s)
+  ifeq ($(UNAME_S),Linux)
+    # Linux
+    ARDUINO_INSTALL_DIR ?= /usr/share/arduino
+    ARDUINO_USER_DIR ?= ${HOME}/Arduino
+  endif
+  ifeq ($(UNAME_S),Darwin)
+    # Darwin (macOS)
+    ARDUINO_INSTALL_DIR ?= /Applications/Arduino.app/Contents/Java
+    ARDUINO_USER_DIR ?= ${HOME}/Documents/Arduino
+    AVR_TOOLS_PATH ?= /Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/
+  endif
+endif
 
 # Arduino source install directory, and version number
 # On most linuxes this will be /usr/share/arduino
-ARDUINO_INSTALL_DIR  ?= ${HOME}/Arduino
-ARDUINO_VERSION      ?= 106
+ARDUINO_INSTALL_DIR  ?= ${HOME}/AppData/Local/Arduino       # C:/Users/${USERNAME}/AppData/Local/Arduino
+ARDUINO_VERSION      ?= 10819
 
 # The installed Libraries are in the User folder
-ARDUINO_USER_DIR ?= ${HOME}/Arduino
+ARDUINO_USER_DIR ?= ${HOME}/Documents/Arduino
 
-# You can optionally set a path to the avr-gcc tools. Requires a trailing slash. (ex: /usr/local/avr-gcc/bin)
+# You can optionally set a path to the avr-gcc tools.
+# Requires a trailing slash. For example, /usr/local/avr-gcc/bin/
 AVR_TOOLS_PATH ?=
 
-#Programmer configuration
+# Programmer configuration
 UPLOAD_RATE        ?= 57600
 AVRDUDE_PROGRAMMER ?= arduino
-# on most linuxes this will be /dev/ttyACM0 or /dev/ttyACM1
+# On most linuxes this will be /dev/ttyACM0 or /dev/ttyACM1
 UPLOAD_PORT        ?= /dev/ttyUSB0
 
-#Directory used to build files in, contains all the build files, from object files to the final hex file
-#on linux it is best to put an absolute path like /home/username/tmp .
+# Directory used to build files in, contains all the build files, from object
+# files to the final hex file on linux it is best to put an absolute path
+# like /home/username/tmp .
 BUILD_DIR          ?= applet
 
 # This defines whether Liquid_TWI2 support will be built
 LIQUID_TWI2        ?= 0
 
-# this defines if Wire is needed
+# This defines if Wire is needed
 WIRE               ?= 0
 
-# this defines if U8GLIB is needed (may require RELOC_WORKAROUND)
-U8GLIB             ?= 1
+# This defines if Tone is needed (i.e., SPEAKER is defined in Configuration.h)
+# Disabling this (and SPEAKER) saves approximately 350 bytes of memory.
+TONE               ?= 1
 
-# this defines whether to include the Trinamic TMCStepper library
-TMC                ?= 1
+# This defines if U8GLIB is needed (may require RELOC_WORKAROUND)
+U8GLIB             ?= 0
 
-# this defines whether to include the AdaFruit NeoPixel library
+# This defines whether to include the Trinamic TMCStepper library
+TMC                ?= 0
+
+# This defines whether to include the AdaFruit NeoPixel library
 NEOPIXEL           ?= 0
 
 ############
 # Try to automatically determine whether RELOC_WORKAROUND is needed based
 # on GCC versions:
-#   http://www.avrfreaks.net/comment/1789106#comment-1789106
+#   https://www.avrfreaks.net/comment/1789106#comment-1789106
 
-CC_MAJ:=$(shell $(CC) -dM -E - < /dev/null | grep __GNUC__ | cut -f3 -d\ )
-CC_MIN:=$(shell $(CC) -dM -E - < /dev/null | grep __GNUC_MINOR__ | cut -f3 -d\ )
-CC_PATCHLEVEL:=$(shell $(CC) -dM -E - < /dev/null | grep __GNUC_PATCHLEVEL__ | cut -f3 -d\ )
+CC_MAJ:=$(shell $(CC) -dM -E - < /dev/null | grep __GNUC__ | cut -f3 -d' ' )
+CC_MIN:=$(shell $(CC) -dM -E - < /dev/null | grep __GNUC_MINOR__ | cut -f3 -d' ' )
+CC_PATCHLEVEL:=$(shell $(CC) -dM -E - < /dev/null | grep __GNUC_PATCHLEVEL__ | cut -f3 -d' ' )
 CC_VER:=$(shell echo $$(( $(CC_MAJ) * 10000 + $(CC_MIN) * 100 + $(CC_PATCHLEVEL) )))
 ifeq ($(shell test $(CC_VER) -lt 40901 && echo 1),1)
-  @echo This version of GCC is likely broken. Enabling relocation workaround.
+  $(warning This GCC version $(CC_VER) is likely broken. Enabling relocation workaround.)
   RELOC_WORKAROUND = 1
 endif
 
@@ -160,6 +187,17 @@ else ifeq ($(HARDWARE_MOTHERBOARD),1033)
 # RAMPS Plus 3DYMY (Power outputs: Spindle, Controller Fan)
 else ifeq ($(HARDWARE_MOTHERBOARD),1034)
 
+# RAMPS 1.6+ (Power outputs: Hotend, Fan, Bed)
+else ifeq ($(HARDWARE_MOTHERBOARD),1040)
+# RAMPS 1.6+ (Power outputs: Hotend0, Hotend1, Bed)
+else ifeq ($(HARDWARE_MOTHERBOARD),1041)
+# RAMPS 1.6+ (Power outputs: Hotend, Fan0, Fan1)
+else ifeq ($(HARDWARE_MOTHERBOARD),1042)
+# RAMPS 1.6+ (Power outputs: Hotend0, Hotend1, Fan)
+else ifeq ($(HARDWARE_MOTHERBOARD),1043)
+# RAMPS 1.6+ (Power outputs: Spindle, Controller Fan)
+else ifeq ($(HARDWARE_MOTHERBOARD),1044)
+
 #
 # RAMPS Derivatives - ATmega1280, ATmega2560
 #
@@ -170,103 +208,140 @@ else ifeq ($(HARDWARE_MOTHERBOARD),1100)
 else ifeq ($(HARDWARE_MOTHERBOARD),1101)
 # Velleman K8400 Controller (derived from 3Drag Controller)
 else ifeq ($(HARDWARE_MOTHERBOARD),1102)
-# 2PrintBeta BAM&DICE with STK drivers
+# Velleman K8600 Controller (Vertex Nano)
 else ifeq ($(HARDWARE_MOTHERBOARD),1103)
-# 2PrintBeta BAM&DICE Due with STK drivers
+# Velleman K8800 Controller (Vertex Delta)
 else ifeq ($(HARDWARE_MOTHERBOARD),1104)
-# MKS BASE v1.0
+# 2PrintBeta BAM&DICE with STK drivers
 else ifeq ($(HARDWARE_MOTHERBOARD),1105)
-# MKS v1.4 with A4982 stepper drivers
+# 2PrintBeta BAM&DICE Due with STK drivers
 else ifeq ($(HARDWARE_MOTHERBOARD),1106)
-# MKS v1.5 with Allegro A4982 stepper drivers
+# MKS BASE v1.0
 else ifeq ($(HARDWARE_MOTHERBOARD),1107)
-# MKS v1.6 with Allegro A4982 stepper drivers
+# MKS BASE v1.4 with Allegro A4982 stepper drivers
 else ifeq ($(HARDWARE_MOTHERBOARD),1108)
-
-# MKS BASE 1.0 with Heroic HR4982 stepper drivers
+# MKS BASE v1.5 with Allegro A4982 stepper drivers
 else ifeq ($(HARDWARE_MOTHERBOARD),1109)
-# MKS GEN v1.3 or 1.4
+# MKS BASE v1.6 with Allegro A4982 stepper drivers
 else ifeq ($(HARDWARE_MOTHERBOARD),1110)
-# MKS GEN L
+# MKS BASE 1.0 with Heroic HR4982 stepper drivers
 else ifeq ($(HARDWARE_MOTHERBOARD),1111)
-# zrib V2.0 control board (Chinese knock off RAMPS replica)
+# MKS GEN v1.3 or 1.4
 else ifeq ($(HARDWARE_MOTHERBOARD),1112)
-# BigTreeTech or BIQU KFB2.0
+# MKS GEN L
 else ifeq ($(HARDWARE_MOTHERBOARD),1113)
-# Felix 2.0+ Electronics Board (RAMPS like)
+# BigTreeTech or BIQU KFB2.0
 else ifeq ($(HARDWARE_MOTHERBOARD),1114)
-# Invent-A-Part RigidBoard
+# Zonestar zrib V2.0 (Chinese RAMPS replica)
 else ifeq ($(HARDWARE_MOTHERBOARD),1115)
-# Invent-A-Part RigidBoard V2
+# Zonestar zrib V5.2 (Chinese RAMPS replica)
 else ifeq ($(HARDWARE_MOTHERBOARD),1116)
-# Sainsmart 2-in-1 board
+# Zonestar zrib V5.3 (Chinese RAMPS replica)
 else ifeq ($(HARDWARE_MOTHERBOARD),1117)
-# Ultimaker
+# Felix 2.0+ Electronics Board (RAMPS like)
 else ifeq ($(HARDWARE_MOTHERBOARD),1118)
-# Ultimaker (Older electronics. Pre 1.5.4. This is rare)
+# Invent-A-Part RigidBoard
 else ifeq ($(HARDWARE_MOTHERBOARD),1119)
-  MCU ?= atmega1280
-
-# Azteeg X3
+# Invent-A-Part RigidBoard V2
 else ifeq ($(HARDWARE_MOTHERBOARD),1120)
-# Azteeg X3 Pro
+# Sainsmart 2-in-1 board
 else ifeq ($(HARDWARE_MOTHERBOARD),1121)
-# Ultimainboard 2.x (Uses TEMP_SENSOR 20)
+# Ultimaker
 else ifeq ($(HARDWARE_MOTHERBOARD),1122)
-# Rumba
+# Ultimaker (Older electronics. Pre 1.5.4. This is rare)
 else ifeq ($(HARDWARE_MOTHERBOARD),1123)
-# Raise3D Rumba
+  MCU              ?= atmega1280
+  PROG_MCU         ?= m1280
+# Azteeg X3
 else ifeq ($(HARDWARE_MOTHERBOARD),1124)
-# Rapide Lite RL200 Rumba
+# Azteeg X3 Pro
 else ifeq ($(HARDWARE_MOTHERBOARD),1125)
-# Formbot T-Rex 2 Plus
+# Ultimainboard 2.x (Uses TEMP_SENSOR 20)
 else ifeq ($(HARDWARE_MOTHERBOARD),1126)
-# Formbot T-Rex 3
+# Rumba
 else ifeq ($(HARDWARE_MOTHERBOARD),1127)
-# Formbot Raptor
+# Raise3D N series Rumba derivative
 else ifeq ($(HARDWARE_MOTHERBOARD),1128)
-# Formbot Raptor 2
+# Rapide Lite 200 (v1, low-cost RUMBA clone with drv)
 else ifeq ($(HARDWARE_MOTHERBOARD),1129)
-# bq ZUM Mega 3D
+# Formbot T-Rex 2 Plus
 else ifeq ($(HARDWARE_MOTHERBOARD),1130)
-# MakeBoard Mini v2.1.2 is a control board sold by MicroMake
+# Formbot T-Rex 3
 else ifeq ($(HARDWARE_MOTHERBOARD),1131)
-# TriGorilla Anycubic version 1.3 based on RAMPS EFB
+# Formbot Raptor
 else ifeq ($(HARDWARE_MOTHERBOARD),1132)
-# TriGorilla Anycubic version 1.4 based on RAMPS EFB
+# Formbot Raptor 2
 else ifeq ($(HARDWARE_MOTHERBOARD),1133)
-# TriGorilla Anycubic version 1.4 Rev 1.1
+# bq ZUM Mega 3D
 else ifeq ($(HARDWARE_MOTHERBOARD),1134)
-# Creality: Ender-4, CR-8
+# MakeBoard Mini v2.1.2 by MicroMake
 else ifeq ($(HARDWARE_MOTHERBOARD),1135)
-# Creality: CR10S, CR20, CR-X
+# TriGorilla Anycubic version 1.3-based on RAMPS EFB
 else ifeq ($(HARDWARE_MOTHERBOARD),1136)
-# Dagoma F5
+#   ... Ver 1.4
 else ifeq ($(HARDWARE_MOTHERBOARD),1137)
-# FYSETC F6 1.3
+#   ... Rev 1.1 (new servo pin order)
 else ifeq ($(HARDWARE_MOTHERBOARD),1138)
-# FYSETC F6 1.5
+# Creality: Ender-4, CR-8
 else ifeq ($(HARDWARE_MOTHERBOARD),1139)
-# Duplicator i3 Plus
+# Creality: CR10S, CR20, CR-X
 else ifeq ($(HARDWARE_MOTHERBOARD),1140)
-# VORON
+# Creality CR-10 V2, CR-10 V3
 else ifeq ($(HARDWARE_MOTHERBOARD),1141)
-# TRONXY V3 1.0
+# Dagoma F5
 else ifeq ($(HARDWARE_MOTHERBOARD),1142)
-# Z-Bolt X Series
+# Dagoma D6 (as found in the Dagoma DiscoUltimate V2 TMC)
 else ifeq ($(HARDWARE_MOTHERBOARD),1143)
-# TT OSCAR
+# FYSETC F6 1.3
 else ifeq ($(HARDWARE_MOTHERBOARD),1144)
-# Overlord/Overlord Pro
+# FYSETC F6 1.4
 else ifeq ($(HARDWARE_MOTHERBOARD),1145)
-# ADIMLab Gantry v1
+# Wanhao Duplicator i3 Plus
 else ifeq ($(HARDWARE_MOTHERBOARD),1146)
-# ADIMLab Gantry v2
+# VORON Design
 else ifeq ($(HARDWARE_MOTHERBOARD),1147)
-# BIQU Tango V1
+# Tronxy TRONXY-V3-1.0
 else ifeq ($(HARDWARE_MOTHERBOARD),1148)
-# MKS GEN L V2
+# Z-Bolt X Series
 else ifeq ($(HARDWARE_MOTHERBOARD),1149)
+# TT OSCAR
+else ifeq ($(HARDWARE_MOTHERBOARD),1150)
+# BIQU Tango V1
+else ifeq ($(HARDWARE_MOTHERBOARD),1151)
+# MKS GEN L V2
+else ifeq ($(HARDWARE_MOTHERBOARD),1152)
+# MKS GEN L V2.1
+else ifeq ($(HARDWARE_MOTHERBOARD),1153)
+# Copymaster 3D
+else ifeq ($(HARDWARE_MOTHERBOARD),1154)
+# Ortur 4
+else ifeq ($(HARDWARE_MOTHERBOARD),1155)
+# Tenlog D3 Hero IDEX printer
+else ifeq ($(HARDWARE_MOTHERBOARD),1156)
+# Tenlog D3, D5, D6 IDEX Printer
+else ifeq ($(HARDWARE_MOTHERBOARD),1157)
+# Ramps S 1.2 by Sakul.cz (Power outputs: Hotend0, Hotend1, Fan, Bed)
+else ifeq ($(HARDWARE_MOTHERBOARD),1158)
+# Ramps S 1.2 by Sakul.cz (Power outputs: Hotend0, Hotend1, Hotend2, Bed)
+else ifeq ($(HARDWARE_MOTHERBOARD),1159)
+# Ramps S 1.2 by Sakul.cz (Power outputs: Hotend, Fan0, Fan1, Bed)
+else ifeq ($(HARDWARE_MOTHERBOARD),1160)
+# Longer LK1 PRO / Alfawise U20 Pro (PRO version)
+else ifeq ($(HARDWARE_MOTHERBOARD),1161)
+# Longer LKx PRO / Alfawise Uxx Pro (PRO version)
+else ifeq ($(HARDWARE_MOTHERBOARD),1162)
+# Pxmalion Core I3
+else ifeq ($(HARDWARE_MOTHERBOARD),1163)
+# Panowin Cutlass (as found in the Panowin F1)
+else ifeq ($(HARDWARE_MOTHERBOARD),1164)
+# Kodama Bardo V1.x (as found in the Kodama Trinus)
+else ifeq ($(HARDWARE_MOTHERBOARD),1165)
+# XTLW MFF V1.0
+else ifeq ($(HARDWARE_MOTHERBOARD),1166)
+# XTLW MFF V2.0
+else ifeq ($(HARDWARE_MOTHERBOARD),1167)
+# E3D Rumba BigBox
+else ifeq ($(HARDWARE_MOTHERBOARD),1168)
 
 #
 # RAMBo and derivatives
@@ -284,6 +359,8 @@ else ifeq ($(HARDWARE_MOTHERBOARD),1203)
 else ifeq ($(HARDWARE_MOTHERBOARD),1204)
 # abee Scoovo X9H
 else ifeq ($(HARDWARE_MOTHERBOARD),1205)
+# ThinkerV2
+else ifeq ($(HARDWARE_MOTHERBOARD),1206)
 
 #
 # Other ATmega1280, ATmega2560
@@ -317,20 +394,50 @@ else ifeq ($(HARDWARE_MOTHERBOARD),1311)
 else ifeq ($(HARDWARE_MOTHERBOARD),1312)
 # Mega controller
 else ifeq ($(HARDWARE_MOTHERBOARD),1313)
-# Geeetech GT2560 Rev B for Mecreator2
+# Geeetech GT2560 Rev A
 else ifeq ($(HARDWARE_MOTHERBOARD),1314)
-# Geeetech GT2560 Rev. A
+# Geeetech GT2560 Rev A+ (with auto level probe)
 else ifeq ($(HARDWARE_MOTHERBOARD),1315)
-# Geeetech GT2560 Rev. A+ (with auto level probe)
+# Geeetech GT2560 Rev B
 else ifeq ($(HARDWARE_MOTHERBOARD),1316)
-# Geeetech GT2560 Rev B for A10(M/D)
+# Geeetech GT2560 Rev B for A10(M/T/D)
 else ifeq ($(HARDWARE_MOTHERBOARD),1317)
-# Geeetech GT2560 Rev B for A20(M/D)
+# Geeetech GT2560 Rev B for Mecreator2
 else ifeq ($(HARDWARE_MOTHERBOARD),1318)
-# Einstart retrofit
+# Geeetech GT2560 Rev B for A20(M/T/D)
 else ifeq ($(HARDWARE_MOTHERBOARD),1319)
-# Wanhao 0ne+ i3 Mini
+# Geeetech GT2560 Rev B for A10(M/T/D)
 else ifeq ($(HARDWARE_MOTHERBOARD),1320)
+# Geeetech GT2560 Rev B for A20(M/T/D)
+else ifeq ($(HARDWARE_MOTHERBOARD),1321)
+# Geeetech GT2560 V4.1B for A10(M/T/D)
+else ifeq ($(HARDWARE_MOTHERBOARD),1322)
+# Einstart retrofit
+else ifeq ($(HARDWARE_MOTHERBOARD),1323)
+# Wanhao 0ne+ i3 Mini
+else ifeq ($(HARDWARE_MOTHERBOARD),1324)
+# Wanhao D9 MK2
+else ifeq ($(HARDWARE_MOTHERBOARD),1325)
+# Overlord/Overlord Pro
+else ifeq ($(HARDWARE_MOTHERBOARD),1326)
+# ADIMLab Gantry v1
+else ifeq ($(HARDWARE_MOTHERBOARD),1327)
+# ADIMLab Gantry v2
+else ifeq ($(HARDWARE_MOTHERBOARD),1328)
+# Leapfrog Xeed 2015
+else ifeq ($(HARDWARE_MOTHERBOARD),1329)
+# PICA Shield (original version)
+else ifeq ($(HARDWARE_MOTHERBOARD),1330)
+# PICA Shield (rev C or later)
+else ifeq ($(HARDWARE_MOTHERBOARD),1331)
+# Intamsys 4.0 (Funmat HT)
+else ifeq ($(HARDWARE_MOTHERBOARD),1332)
+# Malyan M180 Mainboard Version 2
+else ifeq ($(HARDWARE_MOTHERBOARD),1333)
+# Mega controller & Protoneer CNC Shield V3.00
+else ifeq ($(HARDWARE_MOTHERBOARD),1334)
+# WEEDO 62A board (TINA2, Monoprice Cadet, etc.)
+else ifeq ($(HARDWARE_MOTHERBOARD),1335)
 
 #
 # ATmega1281, ATmega2561
@@ -339,9 +446,11 @@ else ifeq ($(HARDWARE_MOTHERBOARD),1320)
 # Minitronics v1.0/1.1
 else ifeq ($(HARDWARE_MOTHERBOARD),1400)
   MCU              ?= atmega1281
+  PROG_MCU         ?= m1281
 # Silvergate v1.0
 else ifeq ($(HARDWARE_MOTHERBOARD),1401)
   MCU              ?= atmega1281
+  PROG_MCU         ?= m1281
 
 #
 # Sanguinololu and Derivatives - ATmega644P, ATmega1284P
@@ -351,42 +460,67 @@ else ifeq ($(HARDWARE_MOTHERBOARD),1401)
 else ifeq ($(HARDWARE_MOTHERBOARD),1500)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega644p
+  PROG_MCU         ?= m644p
 # Sanguinololu 1.2 and above
 else ifeq ($(HARDWARE_MOTHERBOARD),1501)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega644p
+  PROG_MCU         ?= m644p
 # Melzi
 else ifeq ($(HARDWARE_MOTHERBOARD),1502)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega644p
-# Melzi with ATmega1284 (MaKr3d version)
+  PROG_MCU         ?= m644p
+# Melzi V2
 else ifeq ($(HARDWARE_MOTHERBOARD),1503)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega1284p
-# Melzi Creality3D board (for CR-10 etc)
+  PROG_MCU         ?= m1284p
+# Melzi with ATmega1284 (MaKr3d version)
 else ifeq ($(HARDWARE_MOTHERBOARD),1504)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega1284p
-# Melzi Malyan M150 board
+  PROG_MCU         ?= m1284p
+# Melzi Creality3D (for CR-10 etc)
 else ifeq ($(HARDWARE_MOTHERBOARD),1505)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega1284p
-# Tronxy X5S
+  PROG_MCU         ?= m1284p
+# Melzi Creality3D (for Ender-2)
 else ifeq ($(HARDWARE_MOTHERBOARD),1506)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega1284p
-# STB V1.1
+  PROG_MCU         ?= m1284p
+# Melzi Malyan M150
 else ifeq ($(HARDWARE_MOTHERBOARD),1507)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega1284p
-# Azteeg X1
+  PROG_MCU         ?= m1284p
+# Tronxy X5S
 else ifeq ($(HARDWARE_MOTHERBOARD),1508)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega1284p
-# Anet 1.0 (Melzi clone)
+  PROG_MCU         ?= m1284p
+# STB V1.1
 else ifeq ($(HARDWARE_MOTHERBOARD),1509)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega1284p
+  PROG_MCU         ?= m1284p
+# Azteeg X1
+else ifeq ($(HARDWARE_MOTHERBOARD),1510)
+  HARDWARE_VARIANT ?= Sanguino
+  MCU              ?= atmega1284p
+  PROG_MCU         ?= m1284p
+# Anet 1.0 (Melzi clone)
+else ifeq ($(HARDWARE_MOTHERBOARD),1511)
+  HARDWARE_VARIANT ?= Sanguino
+  MCU              ?= atmega1284p
+  PROG_MCU         ?= m1284p
+# ZoneStar ZMIB V2
+else ifeq ($(HARDWARE_MOTHERBOARD),1512)
+  HARDWARE_VARIANT ?= Sanguino
+  MCU              ?= atmega1284p
+  PROG_MCU         ?= m1284p
 
 #
 # Other ATmega644P, ATmega644, ATmega1284P
@@ -396,50 +530,61 @@ else ifeq ($(HARDWARE_MOTHERBOARD),1509)
 else ifeq ($(HARDWARE_MOTHERBOARD),1600)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega644p
+  PROG_MCU         ?= m644p
 # Gen3+
 else ifeq ($(HARDWARE_MOTHERBOARD),1601)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega644p
+  PROG_MCU         ?= m644p
 # Gen6
 else ifeq ($(HARDWARE_MOTHERBOARD),1602)
   HARDWARE_VARIANT ?= Gen6
   MCU              ?= atmega644p
+  PROG_MCU         ?= m644p
 # Gen6 deluxe
 else ifeq ($(HARDWARE_MOTHERBOARD),1603)
   HARDWARE_VARIANT ?= Gen6
   MCU              ?= atmega644p
+  PROG_MCU         ?= m644p
 # Gen7 custom (Alfons3 Version)
 else ifeq ($(HARDWARE_MOTHERBOARD),1604)
   HARDWARE_VARIANT ?= Gen7
   MCU              ?= atmega644
+  PROG_MCU         ?= m644
   F_CPU            ?= 20000000
 # Gen7 v1.1, v1.2
 else ifeq ($(HARDWARE_MOTHERBOARD),1605)
   HARDWARE_VARIANT ?= Gen7
   MCU              ?= atmega644p
+  PROG_MCU         ?= m644p
   F_CPU            ?= 20000000
 # Gen7 v1.3
 else ifeq ($(HARDWARE_MOTHERBOARD),1606)
   HARDWARE_VARIANT ?= Gen7
   MCU              ?= atmega644p
+  PROG_MCU         ?= m644p
   F_CPU            ?= 20000000
 # Gen7 v1.4
 else ifeq ($(HARDWARE_MOTHERBOARD),1607)
   HARDWARE_VARIANT ?= Gen7
   MCU              ?= atmega1284p
+  PROG_MCU         ?= m1284p
   F_CPU            ?= 20000000
 # Alpha OMCA board
 else ifeq ($(HARDWARE_MOTHERBOARD),1608)
   HARDWARE_VARIANT ?= SanguinoA
   MCU              ?= atmega644
+  PROG_MCU         ?= m644
 # Final OMCA board
 else ifeq ($(HARDWARE_MOTHERBOARD),1609)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega644p
+  PROG_MCU         ?= m644p
 # Sethi 3D_1
 else ifeq ($(HARDWARE_MOTHERBOARD),1610)
   HARDWARE_VARIANT ?= Sanguino
   MCU              ?= atmega644p
+  PROG_MCU         ?= m644p
 
 #
 # Teensyduino - AT90USB1286, AT90USB1286P
@@ -449,51 +594,64 @@ else ifeq ($(HARDWARE_MOTHERBOARD),1610)
 else ifeq ($(HARDWARE_MOTHERBOARD),1700)
   HARDWARE_VARIANT ?= Teensy
   MCU              ?= at90usb1286
+  PROG_MCU         ?= usb1286
 # Printrboard (AT90USB1286)
 else ifeq ($(HARDWARE_MOTHERBOARD),1701)
   HARDWARE_VARIANT ?= Teensy
   MCU              ?= at90usb1286
+  PROG_MCU         ?= usb1286
 # Printrboard Revision F (AT90USB1286)
 else ifeq ($(HARDWARE_MOTHERBOARD),1702)
   HARDWARE_VARIANT ?= Teensy
   MCU              ?= at90usb1286
+  PROG_MCU         ?= usb1286
 # Brainwave (AT90USB646)
 else ifeq ($(HARDWARE_MOTHERBOARD),1703)
   HARDWARE_VARIANT ?= Teensy
   MCU              ?= at90usb646
+  PROG_MCU         ?= usb646
 # Brainwave Pro (AT90USB1286)
 else ifeq ($(HARDWARE_MOTHERBOARD),1704)
   HARDWARE_VARIANT ?= Teensy
   MCU              ?= at90usb1286
+  PROG_MCU         ?= usb1286
 # SAV Mk-I (AT90USB1286)
 else ifeq ($(HARDWARE_MOTHERBOARD),1705)
   HARDWARE_VARIANT ?= Teensy
   MCU              ?= at90usb1286
+  PROG_MCU         ?= usb1286
 # Teensy++2.0 (AT90USB1286)
 else ifeq ($(HARDWARE_MOTHERBOARD),1706)
   HARDWARE_VARIANT ?= Teensy
   MCU              ?= at90usb1286
+  PROG_MCU         ?= usb1286
 # 5DPrint D8 Driver Board
 else ifeq ($(HARDWARE_MOTHERBOARD),1707)
   HARDWARE_VARIANT ?= Teensy
   MCU              ?= at90usb1286
+  PROG_MCU         ?= usb1286
+
+#
+# SAM3X8E ARM Cortex-M3
+#
 
 # UltiMachine Archim1 (with DRV8825 drivers)
 else ifeq ($(HARDWARE_MOTHERBOARD),3023)
   HARDWARE_VARIANT ?= archim
   MCPU              = cortex-m3
-  F_CPU             = 84000000L
+  F_CPU             = 84000000
   IS_MCU            = 0
 # UltiMachine Archim2 (with TMC2130 drivers)
 else ifeq ($(HARDWARE_MOTHERBOARD),3024)
   HARDWARE_VARIANT ?= archim
   MCPU              = cortex-m3
-  F_CPU             = 84000000L
+  F_CPU             = 84000000
   IS_MCU            = 0
 endif
 
 # Be sure to regenerate speed_lookuptable.h with create_speed_lookuptable.py
 # if you are setting this to something other than 16MHz
+# Do not put the UL suffix, it's done later on.
 # Set to 16Mhz if not yet set.
 F_CPU ?= 16000000
 
@@ -503,7 +661,8 @@ IS_MCU ?= 1
 ifeq ($(IS_MCU),1)
   # Set to arduino, ATmega2560 if not yet set.
   HARDWARE_VARIANT ?= arduino
-  MCU ?= atmega2560
+  MCU              ?= atmega2560
+  PROG_MCU         ?= m2560
 
   TOOL_PREFIX = avr
   MCU_FLAGS   = -mmcu=$(MCU)
@@ -534,36 +693,45 @@ VPATH += $(BUILD_DIR)
 VPATH += $(HARDWARE_SRC)
 
 ifeq ($(HARDWARE_VARIANT), $(filter $(HARDWARE_VARIANT),arduino Teensy Sanguino))
-VPATH += $(ARDUINO_INSTALL_DIR)/hardware/marlin/avr/libraries/LiquidCrystal/src
-VPATH += $(ARDUINO_INSTALL_DIR)/hardware/marlin/avr/libraries/SPI
+  # Old libraries (avr-core 1.6.21 < / Arduino < 1.6.8)
+  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SPI
+  # New libraries (avr-core >= 1.6.21 / Arduino >= 1.6.8)
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/arduino/avr/1.8.6/libraries/SPI/src
 endif
 
 ifeq ($(IS_MCU),1)
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/cores/arduino
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/arduino/avr/1.8.6/cores/arduino
 
+  # Old libraries (avr-core 1.6.21 < / Arduino < 1.6.8)
   VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SPI
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SPI/src
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SoftwareSerial/src
+  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SoftwareSerial
+  # New libraries (avr-core >= 1.6.21 / Arduino >= 1.6.8)
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/arduino/avr/1.8.6/libraries/SPI/src
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/arduino/avr/1.8.6/libraries/SoftwareSerial/src
 endif
 
 VPATH += $(ARDUINO_INSTALL_DIR)/libraries/LiquidCrystal/src
+
 ifeq ($(LIQUID_TWI2), 1)
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/Wire
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/Wire/utility
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/LiquidTWI2
+  WIRE   = 1
+  VPATH += $(ARDUINO_INSTALL_DIR)/libraries/LiquidTWI2
 endif
 ifeq ($(WIRE), 1)
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/Wire
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/Wire/utility
+  # Old libraries (avr-core 1.6.21 / Arduino < 1.6.8)
+  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/Wire
+  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/Wire/utility
+  # New libraries (avr-core >= 1.6.21 / Arduino >= 1.6.8)
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/avr/1.8.6/libraries/Wire/src
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/avr/1.8.6/libraries/Wire/src/utility
 endif
 ifeq ($(NEOPIXEL), 1)
 VPATH += $(ARDUINO_INSTALL_DIR)/libraries/Adafruit_NeoPixel
 endif
 ifeq ($(U8GLIB), 1)
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib/csrc
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib/cppsrc
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib/fntsrc
+VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib-HAL
+VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib-HAL/src
+# VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib
+# VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib/src
 endif
 ifeq ($(TMC), 1)
 VPATH += $(ARDUINO_INSTALL_DIR)/libraries/TMCStepper/src
@@ -572,9 +740,9 @@ endif
 
 ifeq ($(HARDWARE_VARIANT), arduino)
   HARDWARE_SUB_VARIANT ?= mega
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/variants/$(HARDWARE_SUB_VARIANT)
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/avr/1.8.6/variants/$(HARDWARE_SUB_VARIANT)
 else ifeq ($(HARDWARE_VARIANT), Sanguino)
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/marlin/avr/variants/sanguino
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/avr/1.8.6/variants/sanguino
 else ifeq ($(HARDWARE_VARIANT), archim)
   VPATH   += $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/system/libsam
   VPATH   += $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/system/CMSIS/CMSIS/Include/
@@ -590,7 +758,7 @@ else ifeq ($(HARDWARE_VARIANT), archim)
   LDLIBS   = $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/variants/archim/libsam_sam3x8e_gcc_rel.a
 else
   HARDWARE_SUB_VARIANT ?= standard
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/$(HARDWARE_VARIANT)/variants/$(HARDWARE_SUB_VARIANT)
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/avr/1.8.6/variants/$(HARDWARE_SUB_VARIANT)
 endif
 
 LIB_SRC = wiring.c \
@@ -605,7 +773,7 @@ endif
 
 ifeq ($(HARDWARE_VARIANT), Teensy)
   LIB_SRC = wiring.c
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/teensy/cores/teensy
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/teensy/cores/teensy
 endif
 
 LIB_CXXSRC = WMath.cpp WString.cpp Print.cpp SPI.cpp
@@ -626,13 +794,23 @@ ifeq ($(WIRE), 1)
   LIB_CXXSRC += Wire.cpp
 endif
 
+ifeq ($(TONE), 1)
+  LIB_CXXSRC += Tone.cpp
+endif
+
 ifeq ($(U8GLIB), 1)
   LIB_CXXSRC += U8glib.cpp
-  LIB_SRC += u8g_ll_api.c u8g_bitmap.c u8g_clip.c u8g_com_null.c u8g_delay.c u8g_page.c u8g_pb.c u8g_pb16h1.c u8g_rect.c u8g_state.c u8g_font.c u8g_font_6x13.c u8g_font_04b_03.c u8g_font_5x8.c
+  LIB_SRC += u8g_ll_api.c u8g_bitmap.c u8g_clip.c u8g_com_null.c u8g_delay.c \
+    u8g_page.c u8g_pb.c u8g_pb16h1.c u8g_rect.c u8g_state.c u8g_font.c \
+    u8g_font_6x13.c u8g_font_04b_03.c u8g_font_5x8.c
 endif
 
 ifeq ($(TMC), 1)
-  LIB_CXXSRC += TMCStepper.cpp COOLCONF.cpp DRV_STATUS.cpp IHOLD_IRUN.cpp CHOPCONF.cpp GCONF.cpp PWMCONF.cpp DRV_CONF.cpp DRVCONF.cpp DRVCTRL.cpp DRVSTATUS.cpp ENCMODE.cpp RAMP_STAT.cpp SGCSCONF.cpp SHORT_CONF.cpp SMARTEN.cpp SW_MODE.cpp SW_SPI.cpp TMC2130Stepper.cpp TMC2208Stepper.cpp TMC2209Stepper.cpp TMC2660Stepper.cpp TMC5130Stepper.cpp TMC5160Stepper.cpp
+  LIB_CXXSRC += TMCStepper.cpp COOLCONF.cpp DRV_STATUS.cpp IHOLD_IRUN.cpp \
+    CHOPCONF.cpp GCONF.cpp PWMCONF.cpp DRV_CONF.cpp DRVCONF.cpp DRVCTRL.cpp DRVSTATUS.cpp \
+    GLOBAL_SCALER.cpp SLAVECONF.cpp IOIN.cpp ENCMODE.cpp RAMP_STAT.cpp SGCSCONF.cpp \
+    SHORT_CONF.cpp SMARTEN.cpp SW_MODE.cpp SW_SPI.cpp TMC2130Stepper.cpp TMC2208Stepper.cpp \
+    TMC2209Stepper.cpp TMC2240Stepper.cpp TMC2660Stepper.cpp TMC5130Stepper.cpp TMC5160Stepper.cpp
 endif
 
 ifeq ($(RELOC_WORKAROUND), 1)
@@ -674,17 +852,23 @@ REMOVE = rm -f
 MV = mv -f
 
 # Place -D or -U options here
-CDEFS    = -DF_CPU=$(F_CPU) ${addprefix -D , $(DEFINES)} -DARDUINO=$(ARDUINO_VERSION)
+CDEFS    = -DF_CPU=$(F_CPU)UL ${addprefix -D , $(DEFINES)} -DARDUINO=$(ARDUINO_VERSION)
 CXXDEFS  = $(CDEFS)
 
 ifeq ($(HARDWARE_VARIANT), Teensy)
-  CDEFS  += -DUSB_SERIAL
+  CDEFS      += -DUSB_SERIAL
   LIB_SRC    += usb.c pins_teensy.c
   LIB_CXXSRC += usb_api.cpp
 
 else ifeq ($(HARDWARE_VARIANT), archim)
-  CDEFS      += -DARDUINO_SAM_ARCHIM -DARDUINO_ARCH_SAM -D__SAM3X8E__ -DUSB_VID=0x27b1 -DUSB_PID=0x0001 -DUSBCON '-DUSB_MANUFACTURER="UltiMachine"' '-DUSB_PRODUCT="Archim"'
-  LIB_CXXSRC += variant.cpp IPAddress.cpp Reset.cpp RingBuffer.cpp Stream.cpp UARTClass.cpp  USARTClass.cpp abi.cpp new.cpp watchdog.cpp CDC.cpp PluggableUSB.cpp  USBCore.cpp
+  CDEFS      += -DARDUINO_SAM_ARCHIM -DARDUINO_ARCH_SAM -D__SAM3X8E__
+  CDEFS      += -DUSB_VID=0x27B1 -DUSB_PID=0x0001 -DUSBCON
+  CDEFS      += '-DUSB_MANUFACTURER="UltiMachine"' '-DUSB_PRODUCT_STRING="Archim"'
+
+  LIB_CXXSRC += variant.cpp IPAddress.cpp Reset.cpp RingBuffer.cpp Stream.cpp \
+    UARTClass.cpp  USARTClass.cpp abi.cpp new.cpp watchdog.cpp CDC.cpp \
+    PluggableUSB.cpp USBCore.cpp
+
   LIB_SRC    += cortex_handlers.c iar_calls_sam3.c syscalls_sam3.c dtostrf.c itoa.c
 
   ifeq ($(U8GLIB), 1)
@@ -693,8 +877,8 @@ else ifeq ($(HARDWARE_VARIANT), archim)
 endif
 
 # Add all the source directories as include directories too
-CINCS = ${addprefix -I ,${VPATH}}
-CXXINCS = ${addprefix -I ,${VPATH}}
+CINCS = ${addprefix -I, ${VPATH}}
+CXXINCS = ${addprefix -I, ${VPATH}}
 
 # Silence warnings for library code (won't work for .h files, unfortunately)
 LIBWARN = -w -Wno-packed-bitfield-compat
@@ -710,16 +894,20 @@ CTUNING = -fsigned-char -funsigned-bitfields -fno-exceptions \
 ifneq ($(HARDWARE_MOTHERBOARD),)
   CTUNING += -DMOTHERBOARD=${HARDWARE_MOTHERBOARD}
 endif
+
 #CEXTRA = -Wa,-adhlns=$(<:.c=.lst)
 CXXEXTRA = -fno-use-cxa-atexit -fno-threadsafe-statics -fno-rtti
 CFLAGS := $(CDEBUG) $(CDEFS) $(CINCS) -O$(OPT) $(CEXTRA)   $(CTUNING) $(CSTANDARD)
 CXXFLAGS :=         $(CDEFS) $(CINCS) -O$(OPT) $(CXXEXTRA) $(CTUNING) $(CXXSTANDARD)
 ASFLAGS :=          $(CDEFS)
 #ASFLAGS = -Wa,-adhlns=$(<:.S=.lst),-gstabs
+
 ifeq ($(HARDWARE_VARIANT), archim)
   LD_PREFIX = -Wl,--gc-sections,-Map,Marlin.ino.map,--cref,--check-sections,--entry=Reset_Handler,--unresolved-symbols=report-all,--warn-common,--warn-section-align
   LD_SUFFIX = $(LDLIBS)
-  LDFLAGS   = -lm -T$(LDSCRIPT) -u _sbrk -u link -u _close -u _fstat -u _isatty -u _lseek -u _read -u _write -u _exit -u kill -u _getpid
+
+  LDFLAGS   = -lm -T$(LDSCRIPT) -u _sbrk -u link -u _close -u _fstat -u _isatty
+  LDFLAGS  += -u _lseek -u _read -u _write -u _exit -u kill -u _getpid
 else
   LD_PREFIX = -Wl,--gc-sections,--relax
   LDFLAGS   = -lm
@@ -732,10 +920,10 @@ AVRDUDE_WRITE_FLASH = -Uflash:w:$(BUILD_DIR)/$(TARGET).hex:i
 ifeq ($(shell uname -s), Linux)
   AVRDUDE_CONF = /etc/avrdude/avrdude.conf
 else
-  AVRDUDE_CONF = $(ARDUINO_INSTALL_DIR)/hardware/tools/avr/etc/avrdude.conf
+  AVRDUDE_CONF = $(ARDUINO_INSTALL_DIR)/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf
 endif
 AVRDUDE_FLAGS = -D -C$(AVRDUDE_CONF) \
-  -p$(MCU) -P$(AVRDUDE_PORT) -c$(AVRDUDE_PROGRAMMER) \
+  -p$(PROG_MCU) -P$(AVRDUDE_PORT) -c$(AVRDUDE_PROGRAMMER) \
   -b$(UPLOAD_RATE)
 
 # Since Marlin 2.0, the source files may be distributed into several
@@ -789,11 +977,11 @@ sym: $(BUILD_DIR)/$(TARGET).sym
 # Do not try to reset an Arduino if it's not one
 upload: $(BUILD_DIR)/$(TARGET).hex
 ifeq (${AVRDUDE_PROGRAMMER}, arduino)
-  stty hup < $(UPLOAD_PORT); true
+	stty hup < $(UPLOAD_PORT); true
 endif
-  $(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH)
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH)
 ifeq (${AVRDUDE_PROGRAMMER}, arduino)
-  stty -hup < $(UPLOAD_PORT); true
+	stty -hup < $(UPLOAD_PORT); true
 endif
 
 # Display size of file.
@@ -801,10 +989,10 @@ HEXSIZE = $(SIZE) --target=$(FORMAT) $(BUILD_DIR)/$(TARGET).hex
 ELFSIZE = $(SIZE)  $(SIZE_FLAGS) $(BUILD_DIR)/$(TARGET).elf; \
           $(SIZE)  $(BUILD_DIR)/$(TARGET).elf
 sizebefore:
-  $P if [ -f $(BUILD_DIR)/$(TARGET).elf ]; then echo; echo $(MSG_SIZE_BEFORE); $(HEXSIZE); echo; fi
+	$P if [ -f $(BUILD_DIR)/$(TARGET).elf ]; then echo; echo $(MSG_SIZE_BEFORE); $(HEXSIZE); echo; fi
 
 sizeafter: build
-  $P if [ -f $(BUILD_DIR)/$(TARGET).elf ]; then echo; echo $(MSG_SIZE_AFTER); $(ELFSIZE); echo; fi
+	$P if [ -f $(BUILD_DIR)/$(TARGET).elf ]; then echo; echo $(MSG_SIZE_AFTER); $(ELFSIZE); echo; fi
 
 
 # Convert ELF to COFF for use in debugging / simulating in AVR Studio or VMLAB.
@@ -816,74 +1004,74 @@ COFFCONVERT=$(OBJCOPY) --debugging \
 
 
 coff: $(BUILD_DIR)/$(TARGET).elf
-  $(COFFCONVERT) -O coff-avr $(BUILD_DIR)/$(TARGET).elf $(TARGET).cof
+	$(COFFCONVERT) -O coff-avr $(BUILD_DIR)/$(TARGET).elf $(TARGET).cof
 
 
 extcoff: $(TARGET).elf
-  $(COFFCONVERT) -O coff-ext-avr $(BUILD_DIR)/$(TARGET).elf $(TARGET).cof
+	$(COFFCONVERT) -O coff-ext-avr $(BUILD_DIR)/$(TARGET).elf $(TARGET).cof
 
 
 .SUFFIXES: .elf .hex .eep .lss .sym .bin
 .PRECIOUS: .o
 
 .elf.hex:
-  $(Pecho) "  COPY  $@"
-  $P $(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@
+	$(Pecho) "  COPY  $@"
+	$P $(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@
 
 .elf.bin:
-  $(Pecho) "  COPY  $@"
-  $P $(OBJCOPY) -O binary -R .eeprom $< $@
+	$(Pecho) "  COPY  $@"
+	$P $(OBJCOPY) -O binary -R .eeprom $< $@
 
 .elf.eep:
-  -$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
-    --change-section-lma .eeprom=0 -O $(FORMAT) $< $@
+	-$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
+	  --change-section-lma .eeprom=0 -O $(FORMAT) $< $@
 
 # Create extended listing file from ELF output file.
 .elf.lss:
-  $(OBJDUMP) -h -S $< > $@
+	$(OBJDUMP) -h -S $< > $@
 
 # Create a symbol table from ELF output file.
 .elf.sym:
-  $(NM) -n $< > $@
+	$(NM) -n $< > $@
 
 # Link: create ELF output file from library.
-
+LDFLAGS+= -Wl,-V
 $(BUILD_DIR)/$(TARGET).elf: $(OBJ) Configuration.h
-  $(Pecho) "  CXX   $@"
-  $P $(CC) $(LD_PREFIX) $(ALL_CXXFLAGS) -o $@ -L. $(OBJ) $(LDFLAGS) $(LD_SUFFIX)
+	$(Pecho) "  CXX   $@"
+	$P $(CXX) $(LD_PREFIX) $(ALL_CXXFLAGS) -o $@ -L. $(OBJ) $(LDFLAGS) $(LD_SUFFIX)
 
 # Object files that were found in "src" will be stored in $(BUILD_DIR)
 # in directories that mirror the structure of "src"
 
 $(BUILD_DIR)/%.o: %.c Configuration.h Configuration_adv.h $(MAKEFILE)
-  $(Pecho) "  CC    $<"
-  $P $(CC) -MMD -c $(ALL_CFLAGS) $(CWARN) $< -o $@
+	$(Pecho) "  CC    $<"
+	$P $(CC) -MMD -c $(ALL_CFLAGS) $(CWARN) $< -o $@
 
 $(BUILD_DIR)/%.o: %.cpp Configuration.h Configuration_adv.h $(MAKEFILE)
-  $(Pecho) "  CXX   $<"
-  $P $(CXX) -MMD -c $(ALL_CXXFLAGS) $(CXXWARN) $< -o $@
+	$(Pecho) "  CXX   $<"
+	$P $(CXX) -MMD -c $(ALL_CXXFLAGS) $(CXXWARN) $< -o $@
 
 # Object files for Arduino libs will be created in $(BUILD_DIR)/arduino
 
 $(BUILD_DIR)/arduino/%.o: %.c Configuration.h Configuration_adv.h $(MAKEFILE)
-  $(Pecho) "  CC    $<"
-  $P $(CC) -MMD -c $(ALL_CFLAGS) $(LIBWARN) $< -o $@
+	$(Pecho) "  CC    $<"
+	$P $(CC) -MMD -c $(ALL_CFLAGS) $(LIBWARN) $< -o $@
 
 $(BUILD_DIR)/arduino/%.o: %.cpp Configuration.h Configuration_adv.h $(MAKEFILE)
-  $(Pecho) "  CXX   $<"
-  $P $(CXX) -MMD -c $(ALL_CXXFLAGS)  $(LIBWARN) $< -o $@
+	$(Pecho) "  CXX   $<"
+	$P $(CXX) -MMD -c $(ALL_CXXFLAGS)  $(LIBWARN) $< -o $@
 
 $(BUILD_DIR)/arduino/%.o: %.S $(MAKEFILE)
-  $(Pecho) "  CXX   $<"
-  $P $(CXX) -MMD -c $(ALL_ASFLAGS) $< -o $@
+	$(Pecho) "  CXX   $<"
+	$P $(CXX) -MMD -c $(ALL_ASFLAGS) $< -o $@
 
 # Target: clean project.
 clean:
-  $(Pecho) "  RMDIR $(BUILD_DIR)/"
-  $P rm -rf $(BUILD_DIR)
+	$(Pecho) "  RMDIR $(BUILD_DIR)/"
+	$P rm -rf $(BUILD_DIR)
 
 
 .PHONY: all build elf hex eep lss sym program coff extcoff clean depend sizebefore sizeafter
 
-# Automaticaly include the dependency files created by gcc
+# Automatically include the dependency files created by gcc
 -include ${patsubst %.o, %.d, ${OBJ}}

Marlin/Marlin.ino

@@ -1,9 +1,8 @@
-/*
-================================================================================
+/*==============================================================================
 
   Marlin Firmware
 
-  (c) 2011-2019 MarlinFirmware
+  (c) 2011-2024 MarlinFirmware
   Portions of Marlin are (c) by their respective authors.
   All code complies with GPLv2 and/or GPLv3
 
@@ -12,30 +11,33 @@
 Greetings! Thank you for choosing Marlin 2 as your 3D printer firmware.
 
 To configure Marlin you must edit Configuration.h and Configuration_adv.h
-located in the root 'Marlin' folder. Check the config/examples folder to see if
-there's a more suitable starting-point for your specific hardware.
+located in the root 'Marlin' folder. Check our Configurations repository to
+see if there's a more suitable starting-point for your specific hardware.
 
 Before diving in, we recommend the following essential links:
 
 Marlin Firmware Official Website
 
-  - http://marlinfw.org/
+  - https://marlinfw.org/
     The official Marlin Firmware website contains the most up-to-date
     documentation. Contributions are always welcome!
 
 Configuration
 
-  - https://www.youtube.com/watch?v=3gwWVFtdg-4
+  - https://github.com/MarlinFirmware/Configurations
+    Example configurations for several printer models.
+
+  - https://youtu.be/3gwWVFtdg-4
     A good 20-minute overview of Marlin configuration by Tom Sanladerer.
     (Applies to Marlin 1.0.x, so Jerk and Acceleration should be halved.)
     Also... https://www.google.com/search?tbs=vid%3A1&q=configure+marlin
 
-  - http://marlinfw.org/docs/configuration/configuration.html
+  - https://marlinfw.org/docs/configuration/configuration.html
     Marlin's configuration options are explained in more detail here.
 
 Getting Help
 
-  - http://forums.reprap.org/list.php?415
+  - https://reprap.org/forum/list.php?415
     The Marlin Discussion Forum is a great place to get help from other Marlin
     users who may have experienced similar issues to your own.
 
@@ -45,9 +47,11 @@ Getting Help
 
 Contributing
 
-  - http://marlinfw.org/docs/development/contributing.html
+  - https://marlinfw.org/docs/development/contributing.html
     If you'd like to contribute to Marlin, read this first!
 
-  - http://marlinfw.org/docs/development/coding_standards.html
+  - https://marlinfw.org/docs/development/coding_standards.html
     Before submitting code get to know the Coding Standards.
-*/
+
+
+------------------------------------------------------------------------------*/

Marlin/Version.h

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 #pragma once
@@ -28,20 +28,27 @@
 /**
  * Marlin release version identifier
  */
-//#define SHORT_BUILD_VERSION "2.0.4"
+//#define SHORT_BUILD_VERSION "bugfix-2.1.x"
 
 /**
  * Verbose version identifier which should contain a reference to the location
  * from where the binary was downloaded or the source code was compiled.
  */
-//#define DETAILED_BUILD_VERSION SHORT_BUILD_VERSION " (Github)"
+//#define DETAILED_BUILD_VERSION SHORT_BUILD_VERSION
 
 /**
  * The STRING_DISTRIBUTION_DATE represents when the binary file was built,
  * here we define this default string as the date where the latest release
  * version was tagged.
  */
-//#define STRING_DISTRIBUTION_DATE "2020-01-31"
+//#define STRING_DISTRIBUTION_DATE "2026-01-25"
+
+/**
+ * The protocol for communication to the host. Protocol indicates communication
+ * standards such as the use of ASCII, "echo:" and "error:" line prefixes, etc.
+ * (Other behaviors are given by the firmware version and capabilities report.)
+ */
+//#define PROTOCOL_VERSION "1.0"
 
 /**
  * Defines a generic printer name to be output to the LCD after booting Marlin.
@@ -51,10 +58,10 @@
 /**
  * The SOURCE_CODE_URL is the location where users will find the Marlin Source
  * Code which is installed on the device. In most cases —unless the manufacturer
- * has a distinct Github fork— the Source Code URL should just be the main
+ * has a distinct GitHub fork— the Source Code URL should just be the main
  * Marlin repository.
  */
-//#define SOURCE_CODE_URL "https://github.com/MarlinFirmware/Marlin"
+//#define SOURCE_CODE_URL "github.com/MarlinFirmware/Marlin"
 
 /**
  * Default generic printer UUID.
@@ -65,12 +72,12 @@
  * The WEBSITE_URL is the location where users can get more information such as
  * documentation about a specific Marlin release.
  */
-//#define WEBSITE_URL "http://marlinfw.org"
+//#define WEBSITE_URL "marlinfw.org"
 
 /**
- * Set the vendor info the serial USB interface, if changable
- * Currently only supported by DUE platform
+ * Set the vendor info the serial USB interface, if changeable.
+ * Currently only supported by DUE platform.
  */
-//#define  USB_DEVICE_VENDOR_ID           0x0000
-//#define  USB_DEVICE_PRODUCT_ID          0x0000
-//#define  USB_DEVICE_MANUFACTURE_NAME    WEBSITE_URL
+//#define USB_DEVICE_VENDOR_ID           0x0000
+//#define USB_DEVICE_PRODUCT_ID          0x0000
+//#define USB_DEVICE_MANUFACTURE_NAME    WEBSITE_URL

Marlin/config.ini

@@ -0,0 +1,254 @@
+#
+# Marlin Firmware
+# config.ini - Options to apply before the build
+#
+[config:base]
+#
+# ini_use_config - A comma-separated list of actions to apply to the Configuration files.
+#                  The actions will be applied in the listed order.
+#  - none
+#    Ignore this file and don't apply any configuration options
+#
+#  - base
+#    Just apply the options in config:base to the configuration
+#
+#  - minimal
+#    Just apply the options in config:minimal to the configuration
+#
+#  - all
+#    Apply all 'config:*' sections in this file to the configuration
+#
+#  - another.ini
+#    Load another INI file with a path relative to this config.ini file (i.e., within Marlin/)
+#
+#  - https://me.myserver.com/path/to/configs
+#    Fetch configurations from any URL.
+#
+#  - example/Creality/Ender-5 Plus @ bugfix-2.1.x
+#    Fetch example configuration files from the MarlinFirmware/Configurations repository
+#    https://raw.githubusercontent.com/MarlinFirmware/Configurations/bugfix-2.1.x/config/examples/Creality/Ender-5%20Plus/
+#
+#  - example/default @ release-2.0.9.7
+#    Fetch default configuration files from the MarlinFirmware/Configurations repository
+#    https://raw.githubusercontent.com/MarlinFirmware/Configurations/release-2.0.9.7/config/default/
+#
+#  - [disable]
+#    Comment out all #defines in both Configuration.h and Configuration_adv.h. This is useful
+#    to start with a clean slate before applying any config: options, so only the options explicitly
+#    set in config.ini will be enabled in the configuration.
+#
+#  - [flatten] (Not yet implemented)
+#    Produce a flattened set of Configuration.h and Configuration_adv.h files with only the enabled
+#    #defines and no comments. A clean look, but context-free.
+#
+ini_use_config                           = none
+
+# Load all config: sections in this file
+;ini_use_config                          = all
+# Disable everything and apply subsequent config:base options
+;ini_use_config                          = [disable], base
+# Load config file relative to Marlin/
+;ini_use_config                          = another.ini
+# Download configurations from GitHub
+;ini_use_config                          = example/Creality/Ender-5 Plus @ bugfix-2.1.x
+# Download configurations from your server
+;ini_use_config                          = https://me.myserver.com/path/to/configs
+# Evaluate config:base and do a config dump
+;ini_use_config                          = base
+;config_export                           = 2
+
+[config:minimal]
+motherboard                              = BOARD_RAMPS_14_EFB
+serial_port                              = 0
+baudrate                                 = 250000
+
+string_config_h_author                   = "(default from config.ini)"
+
+capabilities_report                      = on
+extended_capabilities_report             = on
+
+use_watchdog                             = on
+thermal_protection_hotends               = on
+thermal_protection_hysteresis            = 4
+thermal_protection_period                = 40
+
+bufsize                                  = 4
+block_buffer_size                        = 16
+max_cmd_size                             = 96
+
+extruders                                = 1
+temp_sensor_0                            = 1
+
+temp_hysteresis                          = 3
+heater_0_mintemp                         = 5
+heater_0_maxtemp                         = 275
+
+pidtemp                                  = on
+pid_k1                                   = 0.95
+pid_max                                  = 255
+pid_functional_range                     = 20
+
+default_kp                               = 22.20
+default_ki                               = 1.08
+default_kd                               = 114.00
+
+temp_sensor_bed                          = 1
+bed_check_interval                       = 5000
+bed_mintemp                              = 5
+bed_maxtemp                              = 150
+
+thermal_protection_bed                   = on
+thermal_protection_bed_hysteresis        = 2
+thermal_protection_bed_period            = 20
+
+x_driver_type                            = A4988
+y_driver_type                            = A4988
+z_driver_type                            = A4988
+e0_driver_type                           = A4988
+
+x_bed_size                               = 200
+x_min_pos                                = 0
+x_max_pos                                = X_BED_SIZE
+
+y_bed_size                               = 200
+y_min_pos                                = 0
+y_max_pos                                = Y_BED_SIZE
+
+z_min_pos                                = 0
+z_max_pos                                = 200
+
+x_home_dir                               = -1
+y_home_dir                               = -1
+z_home_dir                               = -1
+
+x_min_endstop_hit_state                  = HIGH
+y_min_endstop_hit_state                  = HIGH
+z_min_endstop_hit_state                  = HIGH
+
+default_axis_steps_per_unit              = { 80, 80, 400, 500 }
+axis_relative_modes                      = { false, false, false, false }
+default_max_feedrate                     = { 300, 300, 5, 25 }
+default_max_acceleration                 = { 3000, 3000, 100, 10000 }
+
+homing_feedrate_mm_m                     = { (50*60), (50*60), (4*60) }
+homing_bump_divisor                      = { 2, 2, 4 }
+
+x_enable_on                              = LOW
+y_enable_on                              = LOW
+z_enable_on                              = LOW
+e_enable_on                              = LOW
+
+invert_x_dir                             = false
+invert_y_dir                             = true
+invert_z_dir                             = false
+invert_e0_dir                            = false
+
+step_state_e                             = HIGH
+step_state_x                             = HIGH
+step_state_y                             = HIGH
+step_state_z                             = HIGH
+
+proportional_font_ratio                  = 1.0
+default_nominal_filament_dia             = 1.75
+
+junction_deviation_mm                    = 0.013
+
+default_acceleration                     = 3000
+default_travel_acceleration              = 3000
+default_retract_acceleration             = 3000
+
+default_minimumfeedrate                  = 0.0
+default_mintravelfeedrate                = 0.0
+
+min_steps_per_segment                    = 6
+default_minsegmenttime                   = 20000
+
+[config:basic]
+hotend_overshoot                         = 15
+bed_overshoot                            = 10
+max_bed_power                            = 255
+
+busy_while_heating                       = on
+host_keepalive_feature                   = on
+default_keepalive_interval               = 2
+printjob_timer_autostart                 = on
+
+jd_handle_small_segments                 = on
+validate_homing_endstops                 = on
+editable_steps_per_unit                  = on
+
+eeprom_boot_silent                       = on
+eeprom_chitchat                          = on
+
+endstoppullups                           = on
+
+prevent_cold_extrusion                   = on
+extrude_mintemp                          = 170
+prevent_lengthy_extrude                  = on
+extrude_maxlength                        = 200
+
+min_software_endstops                    = on
+max_software_endstops                    = on
+min_software_endstop_x                   = on
+min_software_endstop_y                   = on
+min_software_endstop_z                   = on
+max_software_endstop_x                   = on
+max_software_endstop_y                   = on
+max_software_endstop_z                   = on
+
+preheat_1_label                          = "PLA"
+preheat_1_temp_hotend                    = 180
+preheat_1_temp_bed                       = 70
+preheat_1_fan_speed                      = 0
+
+preheat_2_label                          = "ABS"
+preheat_2_temp_hotend                    = 240
+preheat_2_temp_bed                       = 110
+preheat_2_fan_speed                      = 0
+
+temp_bed_hysteresis                      = 3
+temp_bed_residency_time                  = 10
+temp_bed_window                          = 1
+temp_residency_time                      = 10
+temp_window                              = 1
+
+[config:advanced]
+arc_support                              = on
+min_arc_segment_mm                       = 0.1
+max_arc_segment_mm                       = 1.0
+min_circle_segments                      = 72
+n_arc_correction                         = 25
+
+auto_report_temperatures                 = on
+
+autotemp                                 = on
+autotemp_min                             = 210
+autotemp_max                             = 250
+autotemp_factor                          = 0.1f
+autotemp_oldweight                       = 0.98
+
+default_stepper_timeout_sec              = 120
+disable_idle_x                           = on
+disable_idle_y                           = on
+disable_idle_z                           = on
+disable_idle_e                           = on
+
+e0_auto_fan_pin                          = -1
+
+faster_gcode_parser                      = on
+debug_flags_gcode                        = on
+
+homing_bump_mm                           = { 5, 5, 2 }
+
+slowdown                                 = on
+slowdown_divisor                         = 2
+multistepping_limit                      = 16
+
+serial_overrun_protection                = on
+tx_buffer_size                           = 0
+
+watch_temp_increase                      = 2
+watch_temp_period                        = 40
+
+watch_bed_temp_increase                  = 2
+watch_bed_temp_period                    = 60

Marlin/lib/readme.txt

@@ -33,4 +33,4 @@ PlatformIO will find your libraries automatically, configure preprocessor's
 include paths and build them.
 
 More information about PlatformIO Library Dependency Finder
-- http://docs.platformio.org/page/librarymanager/ldf.html
+- https://docs.platformio.org/page/librarymanager/ldf.html

Marlin/src/HAL/AVR/HAL.cpp

@@ -0,0 +1,194 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#ifdef __AVR__
+
+#include "../../inc/MarlinConfig.h"
+#include "HAL.h"
+#include <avr/wdt.h>
+
+#ifdef USBCON
+  DefaultSerial1 MSerial0(false, Serial);
+  #ifdef BLUETOOTH
+    BTSerial btSerial(false, bluetoothSerial);
+  #endif
+#endif
+
+// ------------------------
+// Public Variables
+// ------------------------
+
+// Don't initialize/override variable (which would happen in .init4)
+uint8_t MarlinHAL::reset_reason __attribute__((section(".noinit")));
+
+// ------------------------
+// Public functions
+// ------------------------
+
+__attribute__((naked))             // Don't output function pro- and epilogue
+__attribute__((used))              // Output the function, even if "not used"
+__attribute__((section(".init3"))) // Put in an early user definable section
+void save_reset_reason() {
+  #if ENABLED(OPTIBOOT_RESET_REASON)
+    __asm__ __volatile__(
+      A("STS %0, r2")
+      : "=m"(hal.reset_reason)
+    );
+  #else
+    hal.reset_reason = MCUSR;
+  #endif
+
+  // Clear within 16ms since WDRF bit enables a 16ms watchdog timer -> Boot loop
+  hal.clear_reset_source();
+  wdt_disable();
+}
+
+#include "registers.h"
+
+MarlinHAL::MarlinHAL() {
+  TERN_(HAL_AVR_DIRTY_INIT, _ATmega_resetperipherals()); // Clean-wipe the device state.
+}
+
+void MarlinHAL::init() {
+  // Init Servo Pins
+  #if HAS_SERVO_0
+    OUT_WRITE(SERVO0_PIN, LOW);
+  #endif
+  #if HAS_SERVO_1
+    OUT_WRITE(SERVO1_PIN, LOW);
+  #endif
+  #if HAS_SERVO_2
+    OUT_WRITE(SERVO2_PIN, LOW);
+  #endif
+  #if HAS_SERVO_3
+    OUT_WRITE(SERVO3_PIN, LOW);
+  #endif
+  #if HAS_SERVO_4
+    OUT_WRITE(SERVO4_PIN, LOW);
+  #endif
+  #if HAS_SERVO_5
+    OUT_WRITE(SERVO5_PIN, LOW);
+  #endif
+
+  init_pwm_timers();   // Init user timers to default frequency - 1000HZ
+
+  #if PIN_EXISTS(BEEPER) && ENABLED(HAL_AVR_DIRTY_INIT) && DISABLED(ATMEGA_NO_BEEPFIX)
+    // Make sure no alternative is locked onto the BEEPER.
+    // This fixes the issue where the ATmega is constantly beeping.
+    // Might disable other peripherals using the pin; to circumvent that please undefine one of the above things!
+    // The true culprit is the AVR ArduinoCore that enables peripherals redundantly.
+    // (USART1 on the GeeeTech GT2560)
+    // https://youtube.be/jMgCvRXkexk
+    _ATmega_savePinAlternate(BEEPER_PIN);
+
+    OUT_WRITE(BEEPER_PIN, LOW);
+  #endif
+}
+
+void MarlinHAL::reboot() {
+  #if ENABLED(USE_WATCHDOG)
+    while (1) { /* run out the watchdog */ }
+  #else
+    void (*resetFunc)() = 0;  // Declare resetFunc() at address 0
+    resetFunc();              // Jump to address 0
+  #endif
+}
+
+// ------------------------
+// Watchdog Timer
+// ------------------------
+
+#if ENABLED(USE_WATCHDOG)
+
+  #include <avr/wdt.h>
+
+  // Initialize watchdog with 8s timeout, if possible. Otherwise, make it 4s.
+  void MarlinHAL::watchdog_init() {
+    #if ENABLED(WATCHDOG_DURATION_8S) && defined(WDTO_8S)
+      #define WDTO_NS WDTO_8S
+    #else
+      #define WDTO_NS WDTO_4S
+    #endif
+    #if ENABLED(WATCHDOG_RESET_MANUAL)
+      // Enable the watchdog timer, but only for the interrupt.
+      // Take care, as this requires the correct order of operation, with interrupts disabled.
+      // See the datasheet of any AVR chip for details.
+      wdt_reset();
+      cli();
+      _WD_CONTROL_REG = _BV(_WD_CHANGE_BIT) | _BV(WDE);
+      _WD_CONTROL_REG = _BV(WDIE) | (WDTO_NS & 0x07) | ((WDTO_NS & 0x08) << 2); // WDTO_NS directly does not work. bit 0-2 are consecutive in the register but the highest value bit is at bit 5
+                                                                                // So worked for up to WDTO_2S
+      sei();
+      wdt_reset();
+    #else
+      wdt_enable(WDTO_NS); // The function handles the upper bit correct.
+    #endif
+    //delay(10000); // test it!
+  }
+
+  //===========================================================================
+  //=================================== ISR ===================================
+  //===========================================================================
+
+  // Watchdog timer interrupt, called if main program blocks >4sec and manual reset is enabled.
+  #if ENABLED(WATCHDOG_RESET_MANUAL)
+    ISR(WDT_vect) {
+      sei();  // With the interrupt driven serial we need to allow interrupts.
+      SERIAL_ERROR_MSG(STR_WATCHDOG_FIRED);
+      marlin.minkill();  // interrupt-safe final kill and infinite loop
+    }
+  #endif
+
+  // Reset watchdog. MUST be called at least every 4 seconds after the
+  // first watchdog_init or AVR will go into emergency procedures.
+  void MarlinHAL::watchdog_refresh() { wdt_reset(); }
+
+#endif // USE_WATCHDOG
+
+// ------------------------
+// Free Memory Accessor
+// ------------------------
+
+#if HAS_MEDIA
+
+  #include "../../sd/SdFatUtil.h"
+  int freeMemory() { return SdFatUtil::FreeRam(); }
+
+#else // !HAS_MEDIA
+
+  extern "C" {
+    extern char __bss_end;
+    extern char __heap_start;
+    extern void* __brkval;
+
+    int freeMemory() {
+      int free_memory;
+      if ((int)__brkval == 0)
+        free_memory = ((int)&free_memory) - ((int)&__bss_end);
+      else
+        free_memory = ((int)&free_memory) - ((int)__brkval);
+      return free_memory;
+    }
+  }
+
+#endif // !HAS_MEDIA
+
+#endif // __AVR__

Marlin/src/HAL/AVR/HAL.h

@@ -0,0 +1,280 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * HAL for Arduino AVR
+ */
+
+#include "../shared/Marduino.h"
+#include "../shared/HAL_SPI.h"
+#include "fastio.h"
+#include "math.h"
+
+#ifdef USBCON
+  #include <HardwareSerial.h>
+#else
+  #include "MarlinSerial.h"
+  #define BOARD_NO_NATIVE_USB
+#endif
+
+#include <stdint.h>
+#include <util/delay.h>
+#include <avr/eeprom.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+#include <avr/io.h>
+
+//
+// Default graphical display delays
+//
+#if F_CPU >= 20000000
+  #define CPU_ST7920_DELAY_1 150
+  #define CPU_ST7920_DELAY_2   0
+  #define CPU_ST7920_DELAY_3 150
+#elif F_CPU == 16000000
+  #define CPU_ST7920_DELAY_1 125
+  #define CPU_ST7920_DELAY_2   0
+  #define CPU_ST7920_DELAY_3 188
+#endif
+
+#ifndef pgm_read_ptr
+  // Compatibility for avr-libc 1.8.0-4.1 included with Ubuntu for
+  // Windows Subsystem for Linux on Windows 10 as of 10/18/2019
+  #define pgm_read_ptr_far(address_long) (void*)__ELPM_word((uint32_t)(address_long))
+  #define pgm_read_ptr_near(address_short) (void*)__LPM_word((uint16_t)(address_short))
+  #define pgm_read_ptr(address_short) pgm_read_ptr_near(address_short)
+#endif
+
+// ------------------------
+// Defines
+// ------------------------
+
+// AVR PROGMEM extension for sprintf_P
+#define S_FMT "%S"
+
+// AVR PROGMEM extension for string define
+#define PGMSTR(NAM,STR) const char NAM[] PROGMEM = STR
+
+#ifndef CRITICAL_SECTION_START
+  #define CRITICAL_SECTION_START()  unsigned char _sreg = SREG; cli()
+  #define CRITICAL_SECTION_END()    SREG = _sreg
+#endif
+
+#define HAL_CAN_SET_PWM_FREQ   // This HAL supports PWM Frequency adjustment
+#define PWM_FREQUENCY 1000     // Default PWM frequency when set_pwm_duty() is called without set_pwm_frequency()
+
+// ------------------------
+// Types
+// ------------------------
+
+typedef int8_t pin_t;
+
+#define SHARED_SERVOS HAS_SERVOS  // Use shared/servos.cpp
+
+class Servo;
+typedef Servo hal_servo_t;
+
+// ------------------------
+// Serial ports
+// ------------------------
+
+#ifdef USBCON
+  #include "../../core/serial_hook.h"
+  typedef ForwardSerial1Class< decltype(Serial) > DefaultSerial1;
+  extern DefaultSerial1 MSerial0;
+  #ifdef BLUETOOTH
+    typedef ForwardSerial1Class< decltype(bluetoothSerial) > BTSerial;
+    extern BTSerial btSerial;
+  #endif
+
+  #define MYSERIAL1 TERN(BLUETOOTH, btSerial, MSerial0)
+#else
+  #if !WITHIN(SERIAL_PORT, 0, 3)
+    #error "SERIAL_PORT must be from 0 to 3."
+  #endif
+  #define MYSERIAL1 customizedSerial1
+
+  #ifdef SERIAL_PORT_2
+    #if !WITHIN(SERIAL_PORT_2, 0, 3)
+      #error "SERIAL_PORT_2 must be from 0 to 3."
+    #endif
+    #define MYSERIAL2 customizedSerial2
+  #endif
+
+  #ifdef SERIAL_PORT_3
+    #if !WITHIN(SERIAL_PORT_3, 0, 3)
+      #error "SERIAL_PORT_3 must be from 0 to 3."
+    #endif
+    #define MYSERIAL3 customizedSerial3
+  #endif
+#endif
+
+#ifdef MMU_SERIAL_PORT
+  #if !WITHIN(MMU_SERIAL_PORT, 0, 3)
+    #error "MMU_SERIAL_PORT must be from 0 to 3"
+  #endif
+  #define MMU_SERIAL mmuSerial
+#endif
+
+#ifdef LCD_SERIAL_PORT
+  #if !WITHIN(LCD_SERIAL_PORT, 0, 3)
+    #error "LCD_SERIAL_PORT must be from 0 to 3."
+  #endif
+  #define LCD_SERIAL lcdSerial
+  #if ANY(HAS_DGUS_LCD, EXTENSIBLE_UI)
+    #define LCD_SERIAL_TX_BUFFER_FREE() LCD_SERIAL.get_tx_buffer_free()
+  #endif
+#endif
+
+//
+// ADC
+//
+#define HAL_ADC_VREF_MV   5000
+#define HAL_ADC_RESOLUTION  10
+
+//
+// Pin Mapping for M42, M43, M226
+//
+#define GET_PIN_MAP_PIN(index) index
+#define GET_PIN_MAP_INDEX(pin) pin
+#define PARSED_PIN_INDEX(code, dval) parser.intval(code, dval)
+
+#define HAL_SENSITIVE_PINS 0, 1
+
+#ifdef __AVR_AT90USB1286__
+  #define JTAG_DISABLE() do{ MCUCR = 0x80; MCUCR = 0x80; }while(0)
+#endif
+
+// AVR compatibility
+#define strtof strtod
+
+// ------------------------
+// Free Memory Accessor
+// ------------------------
+
+#pragma GCC diagnostic push
+#if GCC_VERSION <= 50000
+  #pragma GCC diagnostic ignored "-Wunused-function"
+#endif
+
+extern "C" int freeMemory();
+
+#pragma GCC diagnostic pop
+
+// ------------------------
+// MarlinHAL Class
+// ------------------------
+
+class MarlinHAL {
+public:
+
+  // Earliest possible init, before setup()
+  MarlinHAL();
+
+  // Watchdog
+  static void watchdog_init()    IF_DISABLED(USE_WATCHDOG, {});
+  static void watchdog_refresh() IF_DISABLED(USE_WATCHDOG, {});
+
+  static void init();          // Called early in setup()
+  static void init_board() {}  // Called less early in setup()
+  static void reboot();        // Restart the firmware from 0x0
+
+  // Interrupts
+  static bool isr_state() { return TEST(SREG, SREG_I); }
+  static void isr_on()  { sei(); }
+  static void isr_off() { cli(); }
+
+  static void delay_ms(const int ms) { delay(ms); }
+
+  // Tasks, called from marlin.idle()
+  static void idletask() {}
+
+  // Reset
+  static uint8_t reset_reason;
+  static uint8_t get_reset_source() { return reset_reason; }
+  static void clear_reset_source() { MCUSR = 0; }
+
+  // Free SRAM
+  static int freeMemory() { return ::freeMemory(); }
+
+  //
+  // ADC Methods
+  //
+
+  // Called by Temperature::init once at startup
+  static void adc_init() {
+    ADCSRA = _BV(ADEN) | _BV(ADSC) | _BV(ADIF) | 0x07;
+    DIDR0 = 0;
+    #ifdef DIDR2
+      DIDR2 = 0;
+    #endif
+  }
+
+  // Called by Temperature::init for each sensor at startup
+  static void adc_enable(const uint8_t ch) {
+    #ifdef DIDR2
+      if (ch > 7) { SBI(DIDR2, ch & 0x07); return; }
+    #endif
+    SBI(DIDR0, ch);
+  }
+
+  // Begin ADC sampling on the given channel. Called from Temperature::isr!
+  static void adc_start(const uint8_t ch) {
+    #ifdef MUX5
+      ADCSRB = ch > 7 ? _BV(MUX5) : 0;
+    #else
+      ADCSRB = 0;
+    #endif
+    ADMUX = _BV(REFS0) | (ch & 0x07);
+    SBI(ADCSRA, ADSC);
+  }
+
+  // Is the ADC ready for reading?
+  static bool adc_ready() { return !TEST(ADCSRA, ADSC); }
+
+  // The current value of the ADC register
+  static __typeof__(ADC) adc_value() { return ADC; }
+
+  /**
+   * init_pwm_timers
+   * Set the default frequency for timers 2-5 to 1000HZ
+   */
+  static void init_pwm_timers();
+
+  /**
+   * Set the PWM duty cycle for the pin to the given value.
+   * Optionally invert the duty cycle [default = false]
+   * Optionally change the scale of the provided value to enable finer PWM duty control [default = 255]
+   */
+  static void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size=255, const bool invert=false);
+
+  /**
+   * Set the frequency of the timer for the given pin as close as
+   * possible to the provided desired frequency. Internally calculate
+   * the required waveform generation mode, prescaler, and resolution
+   * values and set timer registers accordingly.
+   * NOTE that the frequency is applied to all pins on the timer (Ex OC3A, OC3B and OC3B)
+   * NOTE that there are limitations, particularly if using TIMER2. (see Configuration_adv.h -> FAST_PWM_FAN Settings)
+   */
+  static void set_pwm_frequency(const pin_t pin, const uint16_t f_desired);
+};

Marlin/src/HAL/AVR/HAL_SPI.cpp

@@ -0,0 +1,252 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Adapted from Arduino Sd2Card Library
+ * Copyright (c) 2009 by William Greiman
+ */
+
+/**
+ * HAL for AVR - SPI functions
+ */
+
+#ifdef __AVR__
+
+#include "../../inc/MarlinConfig.h"
+
+void spiBegin() {
+  #if PIN_EXISTS(SD_SS)
+    // Do not init HIGH for boards with pin 4 used as Fans or Heaters or otherwise, not likely to have multiple SPI devices anyway.
+    #if defined(__AVR_ATmega644__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__) || defined(__AVR_ATmega1284P__)
+      // SS must be in output mode even it is not chip select
+      SET_OUTPUT(SD_SS_PIN);
+    #else
+      // set SS high - may be chip select for another SPI device
+      OUT_WRITE(SD_SS_PIN, HIGH);
+    #endif
+  #endif
+  SET_OUTPUT(SD_SCK_PIN);
+  SET_INPUT(SD_MISO_PIN);
+  SET_OUTPUT(SD_MOSI_PIN);
+
+  IF_DISABLED(SOFTWARE_SPI, spiInit(SPI_HALF_SPEED));
+}
+
+#if NONE(SOFTWARE_SPI, FORCE_SOFT_SPI)
+
+  // ------------------------
+  // Hardware SPI
+  // ------------------------
+
+  // make sure SPCR rate is in expected bits
+  #if (SPR0 != 0 || SPR1 != 1)
+    #error "unexpected SPCR bits"
+  #endif
+
+  /**
+   * Initialize hardware SPI
+   * Set SCK rate to F_CPU/pow(2, 1 + spiRate) for spiRate [0,6]
+   */
+  void spiInit(uint8_t spiRate) {
+    // See avr processor documentation
+    CBI(
+      #ifdef PRR
+        PRR
+      #elif defined(PRR0)
+        PRR0
+      #endif
+      , PRSPI
+    );
+
+    SPCR = _BV(SPE) | _BV(MSTR) | (spiRate >> 1);
+    SPSR = spiRate & 1 || spiRate == 6 ? 0 : _BV(SPI2X);
+  }
+
+  /** SPI receive a byte */
+  uint8_t spiRec() {
+    SPDR = 0xFF;
+    while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
+    return SPDR;
+  }
+
+  /** SPI read data  */
+  void spiRead(uint8_t *buf, uint16_t nbyte) {
+    if (nbyte-- == 0) return;
+    SPDR = 0xFF;
+    for (uint16_t i = 0; i < nbyte; i++) {
+      while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
+      buf[i] = SPDR;
+      SPDR = 0xFF;
+    }
+    while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
+    buf[nbyte] = SPDR;
+  }
+
+  /** SPI send a byte */
+  void spiSend(uint8_t b) {
+    SPDR = b;
+    while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
+  }
+
+  /** SPI send block  */
+  void spiSendBlock(uint8_t token, const uint8_t *buf) {
+    SPDR = token;
+    for (uint16_t i = 0; i < 512; i += 2) {
+      while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
+      SPDR = buf[i];
+      while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
+      SPDR = buf[i + 1];
+    }
+    while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
+  }
+
+  /** begin spi transaction */
+  void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) {
+    // Based on Arduino SPI library
+    // Clock settings are defined as follows. Note that this shows SPI2X
+    // inverted, so the bits form increasing numbers. Also note that
+    // fosc/64 appears twice
+    // SPR1 SPR0 ~SPI2X Freq
+    //   0    0     0   fosc/2
+    //   0    0     1   fosc/4
+    //   0    1     0   fosc/8
+    //   0    1     1   fosc/16
+    //   1    0     0   fosc/32
+    //   1    0     1   fosc/64
+    //   1    1     0   fosc/64
+    //   1    1     1   fosc/128
+
+    // We find the fastest clock that is less than or equal to the
+    // given clock rate. The clock divider that results in clock_setting
+    // is 2 ^^ (clock_div + 1). If nothing is slow enough, we'll use the
+    // slowest (128 == 2 ^^ 7, so clock_div = 6).
+    uint8_t clockDiv;
+
+    // When the clock is known at compiletime, use this if-then-else
+    // cascade, which the compiler knows how to completely optimize
+    // away. When clock is not known, use a loop instead, which generates
+    // shorter code.
+    if (__builtin_constant_p(spiClock)) {
+      if (spiClock >= F_CPU / 2)       clockDiv = 0;
+      else if (spiClock >= F_CPU / 4)  clockDiv = 1;
+      else if (spiClock >= F_CPU / 8)  clockDiv = 2;
+      else if (spiClock >= F_CPU / 16) clockDiv = 3;
+      else if (spiClock >= F_CPU / 32) clockDiv = 4;
+      else if (spiClock >= F_CPU / 64) clockDiv = 5;
+      else                             clockDiv = 6;
+    }
+    else {
+      uint32_t clockSetting = F_CPU / 2;
+      clockDiv = 0;
+      while (clockDiv < 6 && spiClock < clockSetting) {
+        clockSetting /= 2;
+        clockDiv++;
+      }
+    }
+
+    // Compensate for the duplicate fosc/64
+    if (clockDiv == 6) clockDiv = 7;
+
+    // Invert the SPI2X bit
+    clockDiv ^= 0x1;
+
+    SPCR = _BV(SPE) | _BV(MSTR) | ((bitOrder == LSBFIRST) ? _BV(DORD) : 0) |
+      (dataMode << CPHA) | ((clockDiv >> 1) << SPR0);
+    SPSR = clockDiv | 0x01;
+  }
+
+#else // SOFTWARE_SPI || FORCE_SOFT_SPI
+
+  // ------------------------
+  // Software SPI
+  // ------------------------
+
+  // nop to tune soft SPI timing
+  #define nop asm volatile ("\tnop\n")
+
+  void spiInit(uint8_t) { /* do nothing */ }
+
+  // Begin SPI transaction, set clock, bit order, data mode
+  void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) { /* do nothing */ }
+
+  // Soft SPI receive byte
+  uint8_t spiRec() {
+    uint8_t data = 0;
+    // no interrupts during byte receive - about 8µs
+    cli();
+    // output pin high - like sending 0xFF
+    WRITE(SD_MOSI_PIN, HIGH);
+
+    for (uint8_t i = 0; i < 8; ++i) {
+      WRITE(SD_SCK_PIN, HIGH);
+
+      nop; // adjust so SCK is nice
+      nop;
+
+      data <<= 1;
+
+      if (READ(SD_MISO_PIN)) data |= 1;
+
+      WRITE(SD_SCK_PIN, LOW);
+    }
+
+    sei();
+    return data;
+  }
+
+  // Soft SPI read data
+  void spiRead(uint8_t *buf, uint16_t nbyte) {
+    for (uint16_t i = 0; i < nbyte; i++)
+      buf[i] = spiRec();
+  }
+
+  // Soft SPI send byte
+  void spiSend(uint8_t data) {
+    // no interrupts during byte send - about 8µs
+    cli();
+    for (uint8_t i = 0; i < 8; ++i) {
+      WRITE(SD_SCK_PIN, LOW);
+      WRITE(SD_MOSI_PIN, data & 0x80);
+      data <<= 1;
+      WRITE(SD_SCK_PIN, HIGH);
+    }
+
+    nop; // hold SCK high for a few ns
+    nop;
+    nop;
+    nop;
+
+    WRITE(SD_SCK_PIN, LOW);
+
+    sei();
+  }
+
+  // Soft SPI send block
+  void spiSendBlock(uint8_t token, const uint8_t *buf) {
+    spiSend(token);
+    for (uint16_t i = 0; i < 512; i++)
+      spiSend(buf[i]);
+  }
+
+#endif // SOFTWARE_SPI || FORCE_SOFT_SPI
+
+#endif // __AVR__

Marlin/src/HAL/AVR/MarlinSPI.h

@@ -0,0 +1,26 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include <SPI.h>
+
+using MarlinSPI = SPIClass;

Marlin/src/HAL/AVR/MarlinSerial.cpp

@@ -0,0 +1,651 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * MarlinSerial.cpp - Hardware serial library for Wiring
+ * Copyright (c) 2006 Nicholas Zambetti.  All right reserved.
+ *
+ * Modified 23 November 2006 by David A. Mellis
+ * Modified 28 September 2010 by Mark Sproul
+ * Modified 14 February 2016 by Andreas Hardtung (added tx buffer)
+ * Modified 01 October 2017 by Eduardo José Tagle (added XON/XOFF)
+ * Modified 10 June 2018 by Eduardo José Tagle (See #10991)
+ * Templatized 01 October 2018 by Eduardo José Tagle to allow multiple instances
+ */
+
+#ifdef __AVR__
+
+// Disable HardwareSerial.cpp to support chips without a UART (Attiny, etc.)
+
+#include "../../inc/MarlinConfig.h"
+
+#if !defined(USBCON) && (defined(UBRRH) || defined(UBRR0H) || defined(UBRR1H) || defined(UBRR2H) || defined(UBRR3H))
+
+#include "MarlinSerial.h"
+
+#if ENABLED(DIRECT_STEPPING)
+  #include "../../feature/direct_stepping.h"
+#endif
+
+template<typename Cfg> typename MarlinSerial<Cfg>::ring_buffer_r MarlinSerial<Cfg>::rx_buffer = { 0, 0, { 0 } };
+template<typename Cfg> typename MarlinSerial<Cfg>::ring_buffer_t MarlinSerial<Cfg>::tx_buffer = { 0 };
+template<typename Cfg> bool     MarlinSerial<Cfg>::_written = false;
+template<typename Cfg> uint8_t  MarlinSerial<Cfg>::xon_xoff_state = MarlinSerial<Cfg>::XON_XOFF_CHAR_SENT | MarlinSerial<Cfg>::XON_CHAR;
+template<typename Cfg> uint8_t  MarlinSerial<Cfg>::rx_dropped_bytes = 0;
+template<typename Cfg> uint8_t  MarlinSerial<Cfg>::rx_buffer_overruns = 0;
+template<typename Cfg> uint8_t  MarlinSerial<Cfg>::rx_framing_errors = 0;
+template<typename Cfg> typename MarlinSerial<Cfg>::ring_buffer_pos_t MarlinSerial<Cfg>::rx_max_enqueued = 0;
+
+// A SW memory barrier, to ensure GCC does not overoptimize loops
+#define sw_barrier() asm volatile("": : :"memory");
+
+#include "../../feature/e_parser.h"
+
+// "Atomically" read the RX head index value without disabling interrupts:
+// This MUST be called with RX interrupts enabled, and CAN'T be called
+// from the RX ISR itself!
+template<typename Cfg>
+FORCE_INLINE typename MarlinSerial<Cfg>::ring_buffer_pos_t MarlinSerial<Cfg>::atomic_read_rx_head() {
+  if (Cfg::RX_SIZE > 256) {
+    // Keep reading until 2 consecutive reads return the same value,
+    // meaning there was no update in-between caused by an interrupt.
+    // This works because serial RX interrupts happen at a slower rate
+    // than successive reads of a variable, so 2 consecutive reads with
+    // the same value means no interrupt updated it.
+    ring_buffer_pos_t vold, vnew = rx_buffer.head;
+    sw_barrier();
+    do {
+      vold = vnew;
+      vnew = rx_buffer.head;
+      sw_barrier();
+    } while (vold != vnew);
+    return vnew;
+  }
+  else {
+    // With an 8bit index, reads are always atomic. No need for special handling
+    return rx_buffer.head;
+  }
+}
+
+template<typename Cfg>
+volatile bool MarlinSerial<Cfg>::rx_tail_value_not_stable = false;
+template<typename Cfg>
+volatile uint16_t MarlinSerial<Cfg>::rx_tail_value_backup = 0;
+
+// Set RX tail index, taking into account the RX ISR could interrupt
+//  the write to this variable in the middle - So a backup strategy
+//  is used to ensure reads of the correct values.
+//    -Must NOT be called from the RX ISR -
+template<typename Cfg>
+FORCE_INLINE void MarlinSerial<Cfg>::atomic_set_rx_tail(typename MarlinSerial<Cfg>::ring_buffer_pos_t value) {
+  if (Cfg::RX_SIZE > 256) {
+    // Store the new value in the backup
+    rx_tail_value_backup = value;
+    sw_barrier();
+    // Flag we are about to change the true value
+    rx_tail_value_not_stable = true;
+    sw_barrier();
+    // Store the new value
+    rx_buffer.tail = value;
+    sw_barrier();
+    // Signal the new value is completely stored into the value
+    rx_tail_value_not_stable = false;
+    sw_barrier();
+  }
+  else
+    rx_buffer.tail = value;
+}
+
+// Get the RX tail index, taking into account the read could be
+//  interrupting in the middle of the update of that index value
+//    -Called from the RX ISR -
+template<typename Cfg>
+FORCE_INLINE typename MarlinSerial<Cfg>::ring_buffer_pos_t MarlinSerial<Cfg>::atomic_read_rx_tail() {
+  if (Cfg::RX_SIZE > 256) {
+    // If the true index is being modified, return the backup value
+    if (rx_tail_value_not_stable) return rx_tail_value_backup;
+  }
+  // The true index is stable, return it
+  return rx_buffer.tail;
+}
+
+// (called with RX interrupts disabled)
+template<typename Cfg>
+FORCE_INLINE void MarlinSerial<Cfg>::store_rxd_char() {
+
+  static EmergencyParser::State emergency_state; // = EP_RESET
+
+  // This must read the R_UCSRA register before reading the received byte to detect error causes
+  if (Cfg::DROPPED_RX && B_DOR && !++rx_dropped_bytes) --rx_dropped_bytes;
+  if (Cfg::RX_OVERRUNS && B_DOR && !++rx_buffer_overruns) --rx_buffer_overruns;
+  if (Cfg::RX_FRAMING_ERRORS && B_FE && !++rx_framing_errors) --rx_framing_errors;
+
+  // Read the character from the USART
+  uint8_t c = R_UDR;
+
+  #if ENABLED(DIRECT_STEPPING)
+    if (page_manager.maybe_store_rxd_char(c)) return;
+  #endif
+
+  // Get the tail - Nothing can alter its value while this ISR is executing, but there's
+  // a chance that this ISR interrupted the main process while it was updating the index.
+  // The backup mechanism ensures the correct value is always returned.
+  const ring_buffer_pos_t t = atomic_read_rx_tail();
+
+  // Get the head pointer - This ISR is the only one that modifies its value, so it's safe to read here
+  ring_buffer_pos_t h = rx_buffer.head;
+
+  // Get the next element
+  ring_buffer_pos_t i = (ring_buffer_pos_t)(h + 1) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+
+  if (Cfg::EMERGENCYPARSER) emergency_parser.update(emergency_state, c);
+
+  // If the character is to be stored at the index just before the tail
+  // (such that the head would advance to the current tail), the RX FIFO is
+  // full, so don't write the character or advance the head.
+  if (i != t) {
+    rx_buffer.buffer[h] = c;
+    h = i;
+  }
+  else if (Cfg::DROPPED_RX && !++rx_dropped_bytes)
+    --rx_dropped_bytes;
+
+  if (Cfg::MAX_RX_QUEUED) {
+    // Calculate count of bytes stored into the RX buffer
+    const ring_buffer_pos_t rx_count = (ring_buffer_pos_t)(h - t) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+
+    // Keep track of the maximum count of enqueued bytes
+    NOLESS(rx_max_enqueued, rx_count);
+  }
+
+  if (Cfg::XONOFF) {
+    // If the last char that was sent was an XON
+    if ((xon_xoff_state & XON_XOFF_CHAR_MASK) == XON_CHAR) {
+
+      // Bytes stored into the RX buffer
+      const ring_buffer_pos_t rx_count = (ring_buffer_pos_t)(h - t) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+
+      // If over 12.5% of RX buffer capacity, send XOFF before running out of
+      // RX buffer space .. 325 bytes @ 250kbits/s needed to let the host react
+      // and stop sending bytes. This translates to 13mS propagation time.
+      if (rx_count >= (Cfg::RX_SIZE) / 8) {
+
+        // At this point, definitely no TX interrupt was executing, since the TX ISR can't be preempted.
+        // Don't enable the TX interrupt here as a means to trigger the XOFF char, because if it happens
+        // to be in the middle of trying to disable the RX interrupt in the main program, eventually the
+        // enabling of the TX interrupt could be undone. The ONLY reliable thing this can do to ensure
+        // the sending of the XOFF char is to send it HERE AND NOW.
+
+        // About to send the XOFF char
+        xon_xoff_state = XOFF_CHAR | XON_XOFF_CHAR_SENT;
+
+        // Wait until the TX register becomes empty and send it - Here there could be a problem
+        // - While waiting for the TX register to empty, the RX register could receive a new
+        //   character. This must also handle that situation!
+        while (!B_UDRE) {
+
+          if (B_RXC) {
+            // A char arrived while waiting for the TX buffer to be empty - Receive and process it!
+
+            i = (ring_buffer_pos_t)(h + 1) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+
+            // Read the character from the USART
+            c = R_UDR;
+
+            if (Cfg::EMERGENCYPARSER) emergency_parser.update(emergency_state, c);
+
+            // If the character is to be stored at the index just before the tail
+            // (such that the head would advance to the current tail), the FIFO is
+            // full, so don't write the character or advance the head.
+            if (i != t) {
+              rx_buffer.buffer[h] = c;
+              h = i;
+            }
+            else if (Cfg::DROPPED_RX && !++rx_dropped_bytes)
+              --rx_dropped_bytes;
+          }
+          sw_barrier();
+        }
+
+        R_UDR = XOFF_CHAR;
+
+        // Clear the TXC bit -- "can be cleared by writing a one to its bit
+        // location". This makes sure flush() won't return until the bytes
+        // actually got written
+        B_TXC = 1;
+
+        // At this point there could be a race condition between the write() function
+        // and this sending of the XOFF char. This interrupt could happen between the
+        // wait to be empty TX buffer loop and the actual write of the character. Since
+        // the TX buffer is full because it's sending the XOFF char, the only way to be
+        // sure the write() function will succeed is to wait for the XOFF char to be
+        // completely sent. Since an extra character could be received during the wait
+        // it must also be handled!
+        while (!B_UDRE) {
+
+          if (B_RXC) {
+            // A char arrived while waiting for the TX buffer to be empty - Receive and process it!
+
+            i = (ring_buffer_pos_t)(h + 1) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+
+            // Read the character from the USART
+            c = R_UDR;
+
+            if (Cfg::EMERGENCYPARSER)
+              emergency_parser.update(emergency_state, c);
+
+            // If the character is to be stored at the index just before the tail
+            // (such that the head would advance to the current tail), the FIFO is
+            // full, so don't write the character or advance the head.
+            if (i != t) {
+              rx_buffer.buffer[h] = c;
+              h = i;
+            }
+            else if (Cfg::DROPPED_RX && !++rx_dropped_bytes)
+              --rx_dropped_bytes;
+          }
+          sw_barrier();
+        }
+
+        // At this point everything is ready. The write() function won't
+        // have any issues writing to the UART TX register if it needs to!
+      }
+    }
+  }
+
+  // Store the new head value - The main loop will retry until the value is stable
+  rx_buffer.head = h;
+}
+
+// (called with TX irqs disabled)
+template<typename Cfg>
+FORCE_INLINE void MarlinSerial<Cfg>::_tx_udr_empty_irq() {
+  if (Cfg::TX_SIZE > 0) {
+    // Read positions
+    uint8_t t = tx_buffer.tail;
+    const uint8_t h = tx_buffer.head;
+
+    if (Cfg::XONOFF) {
+      // If an XON char is pending to be sent, do it now
+      if (xon_xoff_state == XON_CHAR) {
+
+        // Send the character
+        R_UDR = XON_CHAR;
+
+        // clear the TXC bit -- "can be cleared by writing a one to its bit
+        // location". This makes sure flush() won't return until the bytes
+        // actually got written
+        B_TXC = 1;
+
+        // Remember we sent it.
+        xon_xoff_state = XON_CHAR | XON_XOFF_CHAR_SENT;
+
+        // If nothing else to transmit, just disable TX interrupts.
+        if (h == t) B_UDRIE = 0; // (Non-atomic, could be reenabled by the main program, but eventually this will succeed)
+
+        return;
+      }
+    }
+
+    // If nothing to transmit, just disable TX interrupts. This could
+    // happen as the result of the non atomicity of the disabling of RX
+    // interrupts that could end reenabling TX interrupts as a side effect.
+    if (h == t) {
+      B_UDRIE = 0; // (Non-atomic, could be reenabled by the main program, but eventually this will succeed)
+      return;
+    }
+
+    // There is something to TX, Send the next byte
+    const uint8_t c = tx_buffer.buffer[t];
+    t = (t + 1) & (Cfg::TX_SIZE - 1);
+    R_UDR = c;
+    tx_buffer.tail = t;
+
+    // Clear the TXC bit (by writing a one to its bit location).
+    // Ensures flush() won't return until the bytes are actually written/
+    B_TXC = 1;
+
+    // Disable interrupts if there is nothing to transmit following this byte
+    if (h == t) B_UDRIE = 0; // (Non-atomic, could be reenabled by the main program, but eventually this will succeed)
+  }
+}
+
+// Public Methods
+template<typename Cfg>
+void MarlinSerial<Cfg>::begin(const long baud) {
+  uint16_t baud_setting;
+  bool useU2X = true;
+
+  #if F_CPU == 16000000UL && SERIAL_PORT == 0
+    // Hard-coded exception for compatibility with the bootloader shipped
+    // with the Duemilanove and previous boards, and the firmware on the
+    // 8U2 on the Uno and Mega 2560.
+    if (baud == 57600) useU2X = false;
+  #endif
+
+  R_UCSRA = 0;
+  if (useU2X) {
+    B_U2X = 1;
+    baud_setting = (F_CPU / 4 / baud - 1) / 2;
+  }
+  else
+    baud_setting = (F_CPU / 8 / baud - 1) / 2;
+
+  // assign the baud_setting, a.k.a. ubbr (USART Baud Rate Register)
+  R_UBRRH = baud_setting >> 8;
+  R_UBRRL = baud_setting;
+
+  B_RXEN = 1;
+  B_TXEN = 1;
+  B_RXCIE = 1;
+  if (Cfg::TX_SIZE > 0) B_UDRIE = 0;
+  _written = false;
+}
+
+template<typename Cfg>
+void MarlinSerial<Cfg>::end() {
+  B_RXEN = 0;
+  B_TXEN = 0;
+  B_RXCIE = 0;
+  B_UDRIE = 0;
+}
+
+template<typename Cfg>
+int MarlinSerial<Cfg>::peek() {
+  const ring_buffer_pos_t h = atomic_read_rx_head(), t = rx_buffer.tail;
+  return h == t ? -1 : rx_buffer.buffer[t];
+}
+
+template<typename Cfg>
+int MarlinSerial<Cfg>::read() {
+  const ring_buffer_pos_t h = atomic_read_rx_head();
+
+  // Read the tail. Main thread owns it, so it is safe to directly read it
+  ring_buffer_pos_t t = rx_buffer.tail;
+
+  // If nothing to read, return now
+  if (h == t) return -1;
+
+  // Get the next char
+  const int v = rx_buffer.buffer[t];
+  t = (ring_buffer_pos_t)(t + 1) & (Cfg::RX_SIZE - 1);
+
+  // Advance tail - Making sure the RX ISR will always get an stable value, even
+  // if it interrupts the writing of the value of that variable in the middle.
+  atomic_set_rx_tail(t);
+
+  if (Cfg::XONOFF) {
+    // If the XOFF char was sent, or about to be sent...
+    if ((xon_xoff_state & XON_XOFF_CHAR_MASK) == XOFF_CHAR) {
+      // Get count of bytes in the RX buffer
+      const ring_buffer_pos_t rx_count = (ring_buffer_pos_t)(h - t) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+      if (rx_count < (Cfg::RX_SIZE) / 10) {
+        if (Cfg::TX_SIZE > 0) {
+          // Signal we want an XON character to be sent.
+          xon_xoff_state = XON_CHAR;
+          // Enable TX ISR. Non atomic, but it will eventually enable them
+          B_UDRIE = 1;
+        }
+        else {
+          // If not using TX interrupts, we must send the XON char now
+          xon_xoff_state = XON_CHAR | XON_XOFF_CHAR_SENT;
+          while (!B_UDRE) sw_barrier();
+          R_UDR = XON_CHAR;
+        }
+      }
+    }
+  }
+
+  return v;
+}
+
+template<typename Cfg>
+typename MarlinSerial<Cfg>::ring_buffer_pos_t MarlinSerial<Cfg>::available() {
+  const ring_buffer_pos_t h = atomic_read_rx_head(), t = rx_buffer.tail;
+  return (ring_buffer_pos_t)(Cfg::RX_SIZE + h - t) & (Cfg::RX_SIZE - 1);
+}
+
+template<typename Cfg>
+void MarlinSerial<Cfg>::flush() {
+
+  // Set the tail to the head:
+  //  - Read the RX head index in a safe way. (See atomic_read_rx_head.)
+  //  - Set the tail, making sure the RX ISR will always get a stable value, even
+  //    if it interrupts the writing of the value of that variable in the middle.
+  atomic_set_rx_tail(atomic_read_rx_head());
+
+  if (Cfg::XONOFF) {
+    // If the XOFF char was sent, or about to be sent...
+    if ((xon_xoff_state & XON_XOFF_CHAR_MASK) == XOFF_CHAR) {
+      if (Cfg::TX_SIZE > 0) {
+        // Signal we want an XON character to be sent.
+        xon_xoff_state = XON_CHAR;
+        // Enable TX ISR. Non atomic, but it will eventually enable it.
+        B_UDRIE = 1;
+      }
+      else {
+        // If not using TX interrupts, we must send the XON char now
+        xon_xoff_state = XON_CHAR | XON_XOFF_CHAR_SENT;
+        while (!B_UDRE) sw_barrier();
+        R_UDR = XON_CHAR;
+      }
+    }
+  }
+}
+
+template<typename Cfg>
+void MarlinSerial<Cfg>::write(const uint8_t c) {
+  if (Cfg::TX_SIZE == 0) {
+
+    _written = true;
+    while (!B_UDRE) sw_barrier();
+    R_UDR = c;
+
+  }
+  else {
+
+    _written = true;
+
+    // If the TX interrupts are disabled and the data register
+    // is empty, just write the byte to the data register and
+    // be done. This shortcut helps significantly improve the
+    // effective datarate at high (>500kbit/s) bitrates, where
+    // interrupt overhead becomes a slowdown.
+    // Yes, there is a race condition between the sending of the
+    // XOFF char at the RX ISR, but it is properly handled there
+    if (!B_UDRIE && B_UDRE) {
+      R_UDR = c;
+
+      // clear the TXC bit -- "can be cleared by writing a one to its bit
+      // location". This makes sure flush() won't return until the bytes
+      // actually got written
+      B_TXC = 1;
+      return;
+    }
+
+    const uint8_t i = (tx_buffer.head + 1) & (Cfg::TX_SIZE - 1);
+
+    // If global interrupts are disabled (as the result of being called from an ISR)...
+    if (!hal.isr_state()) {
+
+      // Make room by polling if it is possible to transmit, and do so!
+      while (i == tx_buffer.tail) {
+
+        // If we can transmit another byte, do it.
+        if (B_UDRE) _tx_udr_empty_irq();
+
+        // Make sure compiler rereads tx_buffer.tail
+        sw_barrier();
+      }
+    }
+    else {
+      // Interrupts are enabled, just wait until there is space
+      while (i == tx_buffer.tail) sw_barrier();
+    }
+
+    // Store new char. head is always safe to move
+    tx_buffer.buffer[tx_buffer.head] = c;
+    tx_buffer.head = i;
+
+    // Enable TX ISR - Non atomic, but it will eventually enable TX ISR
+    B_UDRIE = 1;
+  }
+}
+
+template<typename Cfg>
+void MarlinSerial<Cfg>::flushTX() {
+
+  if (Cfg::TX_SIZE == 0) {
+    // No bytes written, no need to flush. This special case is needed since there's
+    // no way to force the TXC (transmit complete) bit to 1 during initialization.
+    if (!_written) return;
+
+    // Wait until everything was transmitted
+    while (!B_TXC) sw_barrier();
+
+    // At this point nothing is queued anymore (DRIE is disabled) and
+    // the hardware finished transmission (TXC is set).
+
+  }
+  else {
+
+    // No bytes written, no need to flush. This special case is needed since there's
+    // no way to force the TXC (transmit complete) bit to 1 during initialization.
+    if (!_written) return;
+
+    // If global interrupts are disabled (as the result of being called from an ISR)...
+    if (!hal.isr_state()) {
+
+      // Wait until everything was transmitted - We must do polling, as interrupts are disabled
+      while (tx_buffer.head != tx_buffer.tail || !B_TXC) {
+
+        // If there is more space, send an extra character
+        if (B_UDRE) _tx_udr_empty_irq();
+
+        sw_barrier();
+      }
+
+    }
+    else {
+      // Wait until everything was transmitted
+      while (tx_buffer.head != tx_buffer.tail || !B_TXC) sw_barrier();
+    }
+
+    // At this point nothing is queued anymore (DRIE is disabled) and
+    // the hardware finished transmission (TXC is set).
+  }
+}
+
+// Hookup ISR handlers
+ISR(SERIAL_REGNAME(USART, SERIAL_PORT, _RX_vect)) {
+  MarlinSerial<MarlinSerialCfg<SERIAL_PORT>>::store_rxd_char();
+}
+
+ISR(SERIAL_REGNAME(USART, SERIAL_PORT, _UDRE_vect)) {
+  MarlinSerial<MarlinSerialCfg<SERIAL_PORT>>::_tx_udr_empty_irq();
+}
+
+// Because of the template definition above, it's required to instantiate the template to have all methods generated
+template class MarlinSerial< MarlinSerialCfg<SERIAL_PORT> >;
+MSerialT1 customizedSerial1(MSerialT1::HasEmergencyParser);
+
+#ifdef SERIAL_PORT_2
+
+  // Hookup ISR handlers
+  ISR(SERIAL_REGNAME(USART, SERIAL_PORT_2, _RX_vect)) {
+    MarlinSerial<MarlinSerialCfg<SERIAL_PORT_2>>::store_rxd_char();
+  }
+
+  ISR(SERIAL_REGNAME(USART, SERIAL_PORT_2, _UDRE_vect)) {
+    MarlinSerial<MarlinSerialCfg<SERIAL_PORT_2>>::_tx_udr_empty_irq();
+  }
+
+  template class MarlinSerial< MarlinSerialCfg<SERIAL_PORT_2> >;
+  MSerialT2 customizedSerial2(MSerialT2::HasEmergencyParser);
+
+#endif // SERIAL_PORT_2
+
+#ifdef SERIAL_PORT_3
+
+  // Hookup ISR handlers
+  ISR(SERIAL_REGNAME(USART, SERIAL_PORT_3, _RX_vect)) {
+    MarlinSerial<MarlinSerialCfg<SERIAL_PORT_3>>::store_rxd_char();
+  }
+
+  ISR(SERIAL_REGNAME(USART, SERIAL_PORT_3, _UDRE_vect)) {
+    MarlinSerial<MarlinSerialCfg<SERIAL_PORT_3>>::_tx_udr_empty_irq();
+  }
+
+  template class MarlinSerial< MarlinSerialCfg<SERIAL_PORT_3> >;
+  MSerialT3 customizedSerial3(MSerialT3::HasEmergencyParser);
+
+#endif // SERIAL_PORT_3
+
+#ifdef MMU_SERIAL_PORT
+
+  ISR(SERIAL_REGNAME(USART, MMU_SERIAL_PORT, _RX_vect)) {
+    MarlinSerial<MMU2SerialCfg<MMU_SERIAL_PORT>>::store_rxd_char();
+  }
+
+  ISR(SERIAL_REGNAME(USART, MMU_SERIAL_PORT, _UDRE_vect)) {
+    MarlinSerial<MMU2SerialCfg<MMU_SERIAL_PORT>>::_tx_udr_empty_irq();
+  }
+
+  template class MarlinSerial< MMU2SerialCfg<MMU_SERIAL_PORT> >;
+  MSerialMMU2 mmuSerial(MSerialMMU2::HasEmergencyParser);
+
+#endif // MMU_SERIAL_PORT
+
+#ifdef LCD_SERIAL_PORT
+
+  ISR(SERIAL_REGNAME(USART, LCD_SERIAL_PORT, _RX_vect)) {
+    MarlinSerial<LCDSerialCfg<LCD_SERIAL_PORT>>::store_rxd_char();
+  }
+
+  ISR(SERIAL_REGNAME(USART, LCD_SERIAL_PORT, _UDRE_vect)) {
+    MarlinSerial<LCDSerialCfg<LCD_SERIAL_PORT>>::_tx_udr_empty_irq();
+  }
+
+  template class MarlinSerial< LCDSerialCfg<LCD_SERIAL_PORT> >;
+  MSerialLCD lcdSerial(MSerialLCD::HasEmergencyParser);
+
+  #if ANY(HAS_DGUS_LCD, EXTENSIBLE_UI)
+    template<typename Cfg>
+    typename MarlinSerial<Cfg>::ring_buffer_pos_t MarlinSerial<Cfg>::get_tx_buffer_free() {
+      const ring_buffer_pos_t t = tx_buffer.tail,  // next byte to send.
+                              h = tx_buffer.head;  // next pos for queue.
+      int ret = t - h - 1;
+      if (ret < 0) ret += Cfg::TX_SIZE + 1;
+      return ret;
+    }
+  #endif
+
+#endif // LCD_SERIAL_PORT
+
+#endif // !USBCON && (UBRRH || UBRR0H || UBRR1H || UBRR2H || UBRR3H)
+
+// For AT90USB targets use the UART for BT interfacing
+#if defined(USBCON) && ENABLED(BLUETOOTH)
+  MSerialBT bluetoothSerial(false);
+#endif
+
+#endif // __AVR__

Marlin/src/HAL/AVR/MarlinSerial.h

@@ -0,0 +1,290 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * MarlinSerial.h - Hardware serial library for Wiring
+ * Copyright (c) 2006 Nicholas Zambetti.  All right reserved.
+ *
+ * Modified 28 September 2010 by Mark Sproul
+ * Modified 14 February 2016 by Andreas Hardtung (added tx buffer)
+ * Modified 01 October 2017 by Eduardo José Tagle (added XON/XOFF)
+ * Templatized 01 October 2018 by Eduardo José Tagle to allow multiple instances
+ */
+
+#include <WString.h>
+
+#include "../../inc/MarlinConfigPre.h"
+#include "../../core/types.h"
+#include "../../core/serial_hook.h"
+
+#ifndef USBCON
+
+  // The presence of the UBRRH register is used to detect a UART.
+  #define UART_PRESENT(port) ((port == 0 && (defined(UBRRH) || defined(UBRR0H))) || \
+                              (port == 1 && defined(UBRR1H)) || (port == 2 && defined(UBRR2H)) || \
+                              (port == 3 && defined(UBRR3H)))
+
+  // These are macros to build serial port register names for the selected SERIAL_PORT (C preprocessor
+  // requires two levels of indirection to expand macro values properly)
+  #define SERIAL_REGNAME(registerbase,number,suffix) _SERIAL_REGNAME(registerbase,number,suffix)
+  #if SERIAL_PORT == 0 && (!defined(UBRR0H) || !defined(UDR0)) // use un-numbered registers if necessary
+    #define _SERIAL_REGNAME(registerbase,number,suffix) registerbase##suffix
+  #else
+    #define _SERIAL_REGNAME(registerbase,number,suffix) registerbase##number##suffix
+  #endif
+
+  // Registers used by MarlinSerial class (expanded depending on selected serial port)
+
+  // Templated 8bit register (generic)
+  #define UART_REGISTER_DECL_BASE(registerbase, suffix) \
+    template<int portNr> struct R_##registerbase##x##suffix {}
+
+  // Templated 8bit register (specialization for each port)
+  #define UART_REGISTER_DECL(port, registerbase, suffix) \
+    template<> struct R_##registerbase##x##suffix<port> { \
+      constexpr R_##registerbase##x##suffix(int) {} \
+      FORCE_INLINE void operator=(uint8_t newVal) const { SERIAL_REGNAME(registerbase,port,suffix) = newVal; } \
+      FORCE_INLINE operator uint8_t() const { return SERIAL_REGNAME(registerbase,port,suffix); } \
+    }
+
+  // Templated 1bit register (generic)
+  #define UART_BIT_DECL_BASE(registerbase, suffix, bit) \
+    template<int portNr>struct B_##bit##x {}
+
+  // Templated 1bit register (specialization for each port)
+  #define UART_BIT_DECL(port, registerbase, suffix, bit) \
+    template<> struct B_##bit##x<port> { \
+      constexpr B_##bit##x(int) {} \
+      FORCE_INLINE void operator=(int newVal) const { \
+        if (newVal) \
+          SBI(SERIAL_REGNAME(registerbase,port,suffix),SERIAL_REGNAME(bit,port,)); \
+        else \
+          CBI(SERIAL_REGNAME(registerbase,port,suffix),SERIAL_REGNAME(bit,port,)); \
+      } \
+      FORCE_INLINE operator bool() const { return TEST(SERIAL_REGNAME(registerbase,port,suffix),SERIAL_REGNAME(bit,port,)); } \
+    }
+
+  #define UART_DECL_BASE() \
+    UART_REGISTER_DECL_BASE(UCSR,A);\
+    UART_REGISTER_DECL_BASE(UDR,);\
+    UART_REGISTER_DECL_BASE(UBRR,H);\
+    UART_REGISTER_DECL_BASE(UBRR,L);\
+    UART_BIT_DECL_BASE(UCSR,B,RXEN);\
+    UART_BIT_DECL_BASE(UCSR,B,TXEN);\
+    UART_BIT_DECL_BASE(UCSR,A,TXC);\
+    UART_BIT_DECL_BASE(UCSR,B,RXCIE);\
+    UART_BIT_DECL_BASE(UCSR,A,UDRE);\
+    UART_BIT_DECL_BASE(UCSR,A,FE);\
+    UART_BIT_DECL_BASE(UCSR,A,DOR);\
+    UART_BIT_DECL_BASE(UCSR,B,UDRIE);\
+    UART_BIT_DECL_BASE(UCSR,A,RXC);\
+    UART_BIT_DECL_BASE(UCSR,A,U2X)
+
+  #define UART_DECL(port) \
+    UART_REGISTER_DECL(port,UCSR,A);\
+    UART_REGISTER_DECL(port,UDR,);\
+    UART_REGISTER_DECL(port,UBRR,H);\
+    UART_REGISTER_DECL(port,UBRR,L);\
+    UART_BIT_DECL(port,UCSR,B,RXEN);\
+    UART_BIT_DECL(port,UCSR,B,TXEN);\
+    UART_BIT_DECL(port,UCSR,A,TXC);\
+    UART_BIT_DECL(port,UCSR,B,RXCIE);\
+    UART_BIT_DECL(port,UCSR,A,UDRE);\
+    UART_BIT_DECL(port,UCSR,A,FE);\
+    UART_BIT_DECL(port,UCSR,A,DOR);\
+    UART_BIT_DECL(port,UCSR,B,UDRIE);\
+    UART_BIT_DECL(port,UCSR,A,RXC);\
+    UART_BIT_DECL(port,UCSR,A,U2X)
+
+  // Declare empty templates
+  UART_DECL_BASE();
+
+  // And all the specializations for each possible serial port
+  #if UART_PRESENT(0)
+    UART_DECL(0);
+  #endif
+  #if UART_PRESENT(1)
+    UART_DECL(1);
+  #endif
+  #if UART_PRESENT(2)
+    UART_DECL(2);
+  #endif
+  #if UART_PRESENT(3)
+    UART_DECL(3);
+  #endif
+
+  #define BYTE 0
+
+  template<typename Cfg>
+  class MarlinSerial {
+  protected:
+    // Registers
+    static constexpr R_UCSRxA<Cfg::PORT> R_UCSRA = 0;
+    static constexpr R_UDRx<Cfg::PORT>   R_UDR   = 0;
+    static constexpr R_UBRRxH<Cfg::PORT> R_UBRRH = 0;
+    static constexpr R_UBRRxL<Cfg::PORT> R_UBRRL = 0;
+
+    // Bits
+    static constexpr B_RXENx<Cfg::PORT>  B_RXEN  = 0;
+    static constexpr B_TXENx<Cfg::PORT>  B_TXEN  = 0;
+    static constexpr B_TXCx<Cfg::PORT>   B_TXC   = 0;
+    static constexpr B_RXCIEx<Cfg::PORT> B_RXCIE = 0;
+    static constexpr B_UDREx<Cfg::PORT>  B_UDRE  = 0;
+    static constexpr B_FEx<Cfg::PORT>    B_FE    = 0;
+    static constexpr B_DORx<Cfg::PORT>   B_DOR   = 0;
+    static constexpr B_UDRIEx<Cfg::PORT> B_UDRIE = 0;
+    static constexpr B_RXCx<Cfg::PORT>   B_RXC   = 0;
+    static constexpr B_U2Xx<Cfg::PORT>   B_U2X   = 0;
+
+    // Base size of type on buffer size
+    typedef uvalue_t(Cfg::RX_SIZE - 1) ring_buffer_pos_t;
+
+    struct ring_buffer_r {
+      volatile ring_buffer_pos_t head, tail;
+      unsigned char buffer[Cfg::RX_SIZE];
+    };
+
+    struct ring_buffer_t {
+      volatile uint8_t head, tail;
+      unsigned char buffer[Cfg::TX_SIZE];
+    };
+
+    static ring_buffer_r rx_buffer;
+    static ring_buffer_t tx_buffer;
+    static bool _written;
+
+    static constexpr uint8_t XON_XOFF_CHAR_SENT = 0x80,  // XON / XOFF Character was sent
+                             XON_XOFF_CHAR_MASK = 0x1F;  // XON / XOFF character to send
+
+    // XON / XOFF character definitions
+    static constexpr uint8_t XON_CHAR  = 17, XOFF_CHAR = 19;
+    static uint8_t xon_xoff_state,
+                   rx_dropped_bytes,
+                   rx_buffer_overruns,
+                   rx_framing_errors;
+    static ring_buffer_pos_t rx_max_enqueued;
+
+    FORCE_INLINE static ring_buffer_pos_t atomic_read_rx_head();
+
+    static volatile bool rx_tail_value_not_stable;
+    static volatile uint16_t rx_tail_value_backup;
+
+    FORCE_INLINE static void atomic_set_rx_tail(ring_buffer_pos_t value);
+    FORCE_INLINE static ring_buffer_pos_t atomic_read_rx_tail();
+
+  public:
+    FORCE_INLINE static void store_rxd_char();
+    FORCE_INLINE static void _tx_udr_empty_irq();
+
+  public:
+    static void begin(const long);
+    static void end();
+    static int peek();
+    static int read();
+    static void flush();
+    static ring_buffer_pos_t available();
+    static void write(const uint8_t c);
+    static void flushTX();
+    #if ANY(HAS_DGUS_LCD, EXTENSIBLE_UI)
+      static ring_buffer_pos_t get_tx_buffer_free();
+    #endif
+
+    enum { HasEmergencyParser = Cfg::EMERGENCYPARSER };
+    static bool emergency_parser_enabled() { return Cfg::EMERGENCYPARSER; }
+
+    FORCE_INLINE static uint8_t dropped() { return Cfg::DROPPED_RX ? rx_dropped_bytes : 0; }
+    FORCE_INLINE static uint8_t buffer_overruns() { return Cfg::RX_OVERRUNS ? rx_buffer_overruns : 0; }
+    FORCE_INLINE static uint8_t framing_errors() { return Cfg::RX_FRAMING_ERRORS ? rx_framing_errors : 0; }
+    FORCE_INLINE static ring_buffer_pos_t rxMaxEnqueued() { return Cfg::MAX_RX_QUEUED ? rx_max_enqueued : 0; }
+  };
+
+  template <uint8_t serial>
+  struct MarlinSerialCfg {
+    static constexpr int PORT               = serial;
+    static constexpr unsigned int RX_SIZE   = RX_BUFFER_SIZE;
+    static constexpr unsigned int TX_SIZE   = TX_BUFFER_SIZE;
+    static constexpr bool XONOFF            = ENABLED(SERIAL_XON_XOFF);
+    static constexpr bool EMERGENCYPARSER   = ENABLED(EMERGENCY_PARSER);
+    static constexpr bool DROPPED_RX        = ENABLED(SERIAL_STATS_DROPPED_RX);
+    static constexpr bool RX_OVERRUNS       = ENABLED(SERIAL_STATS_RX_BUFFER_OVERRUNS);
+    static constexpr bool RX_FRAMING_ERRORS = ENABLED(SERIAL_STATS_RX_FRAMING_ERRORS);
+    static constexpr bool MAX_RX_QUEUED     = ENABLED(SERIAL_STATS_MAX_RX_QUEUED);
+  };
+
+  typedef Serial1Class< MarlinSerial< MarlinSerialCfg<SERIAL_PORT> > > MSerialT1;
+  extern MSerialT1 customizedSerial1;
+
+  #ifdef SERIAL_PORT_2
+    typedef Serial1Class< MarlinSerial< MarlinSerialCfg<SERIAL_PORT_2> > > MSerialT2;
+    extern MSerialT2 customizedSerial2;
+  #endif
+
+  #ifdef SERIAL_PORT_3
+    typedef Serial1Class< MarlinSerial< MarlinSerialCfg<SERIAL_PORT_3> > > MSerialT3;
+    extern MSerialT3 customizedSerial3;
+  #endif
+
+#endif // !USBCON
+
+#ifdef MMU_SERIAL_PORT
+  template <uint8_t serial>
+  struct MMU2SerialCfg {
+    static constexpr int PORT               = serial;
+    static constexpr unsigned int RX_SIZE   = 32;
+    static constexpr unsigned int TX_SIZE   = 32;
+    static constexpr bool XONOFF            = false;
+    static constexpr bool EMERGENCYPARSER   = false;
+    static constexpr bool DROPPED_RX        = false;
+    static constexpr bool RX_FRAMING_ERRORS = false;
+    static constexpr bool MAX_RX_QUEUED     = false;
+    static constexpr bool RX_OVERRUNS       = false;
+  };
+
+  typedef Serial1Class< MarlinSerial< MMU2SerialCfg<MMU_SERIAL_PORT> > > MSerialMMU2;
+  extern MSerialMMU2 mmuSerial;
+#endif
+
+#ifdef LCD_SERIAL_PORT
+
+  template <uint8_t serial>
+  struct LCDSerialCfg {
+    static constexpr int PORT               = serial;
+    static constexpr unsigned int RX_SIZE   = TERN(HAS_DGUS_LCD, DGUS_RX_BUFFER_SIZE,  64);
+    static constexpr unsigned int TX_SIZE   = TERN(HAS_DGUS_LCD, DGUS_TX_BUFFER_SIZE, 128);
+    static constexpr bool XONOFF            = false;
+    static constexpr bool EMERGENCYPARSER   = ENABLED(EMERGENCY_PARSER);
+    static constexpr bool DROPPED_RX        = false;
+    static constexpr bool RX_FRAMING_ERRORS = false;
+    static constexpr bool MAX_RX_QUEUED     = false;
+    static constexpr bool RX_OVERRUNS       = ALL(HAS_DGUS_LCD, SERIAL_STATS_RX_BUFFER_OVERRUNS);
+  };
+
+  typedef Serial1Class< MarlinSerial< LCDSerialCfg<LCD_SERIAL_PORT> > > MSerialLCD;
+  extern MSerialLCD lcdSerial;
+#endif
+
+// Use the UART for Bluetooth in AT90USB configurations
+#if defined(USBCON) && ENABLED(BLUETOOTH)
+  typedef Serial1Class<HardwareSerial> MSerialBT;
+  extern MSerialBT bluetoothSerial;
+#endif

Marlin/src/HAL/AVR/Servo.cpp

@@ -0,0 +1,225 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * servo.cpp - Interrupt driven Servo library for Arduino using 16 bit timers- Version 2
+ * Copyright (c) 2009 Michael Margolis.  All right reserved.
+ */
+
+/**
+ * A servo is activated by creating an instance of the Servo class passing the desired pin to the attach() method.
+ * The servos are pulsed in the background using the value most recently written using the write() method
+ *
+ * Note that analogWrite of PWM on pins associated with the timer are disabled when the first servo is attached.
+ * Timers are seized as needed in groups of 12 servos - 24 servos use two timers, 48 servos will use four.
+ *
+ * The methods are:
+ *
+ * Servo - Class for manipulating servo motors connected to Arduino pins.
+ *
+ * attach(pin)           - Attach a servo motor to an i/o pin.
+ * attach(pin, min, max) - Attach to a pin, setting min and max values in microseconds
+ *                         Default min is 544, max is 2400
+ *
+ * write()               - Set the servo angle in degrees. (Invalid angles —over MIN_PULSE_WIDTH— are treated as µs.)
+ * writeMicroseconds()   - Set the servo pulse width in microseconds.
+ * move(pin, angle)      - Sequence of attach(pin), write(angle), safe_delay(servo_delay[servoIndex]).
+ *                         With DEACTIVATE_SERVOS_AFTER_MOVE it detaches after servo_delay[servoIndex].
+ * read()                - Get the last-written servo pulse width as an angle between 0 and 180.
+ * readMicroseconds()    - Get the last-written servo pulse width in microseconds.
+ * attached()            - Return true if a servo is attached.
+ * detach()              - Stop an attached servo from pulsing its i/o pin.
+ */
+
+#ifdef __AVR__
+
+#include "../../inc/MarlinConfig.h"
+
+#if HAS_SERVOS
+
+#include <avr/interrupt.h>
+
+#include "../shared/servo.h"
+#include "../shared/servo_private.h"
+
+static volatile int8_t Channel[_Nbr_16timers];              // counter for the servo being pulsed for each timer (or -1 if refresh interval)
+
+/************ static functions common to all instances ***********************/
+
+static inline void handle_interrupts(const timer16_Sequence_t timer, volatile uint16_t* TCNTn, volatile uint16_t* OCRnA) {
+  int8_t cho = Channel[timer];                                        // Handle the prior Channel[timer] first
+  if (cho < 0)                                                        // Channel -1 indicates the refresh interval completed...
+    *TCNTn = 0;                                                       // ...so reset the timer
+  else if (SERVO_INDEX(timer, cho) < ServoCount)                      // prior channel handled?
+    extDigitalWrite(SERVO(timer, cho).Pin.nbr, LOW);                  // pulse the prior channel LOW
+
+  Channel[timer] = ++cho;                                             // Handle the next channel (or 0)
+  if (cho < SERVOS_PER_TIMER && SERVO_INDEX(timer, cho) < ServoCount) {
+    *OCRnA = *TCNTn + SERVO(timer, cho).ticks;                        // set compare to current ticks plus duration
+    if (SERVO(timer, cho).Pin.isActive)                               // activated?
+      extDigitalWrite(SERVO(timer, cho).Pin.nbr, HIGH);               // yes: pulse HIGH
+  }
+  else {
+    // finished all channels so wait for the refresh period to expire before starting over
+    const unsigned int cval = ((unsigned)*TCNTn) + 32 / (SERVO_TIMER_PRESCALER), // allow 32 cycles to ensure the next OCR1A not missed
+                       ival = (unsigned int)usToTicks(REFRESH_INTERVAL); // at least REFRESH_INTERVAL has elapsed
+    *OCRnA = max(cval, ival);
+
+    Channel[timer] = -1;                                              // reset the timer counter to 0 on the next call
+  }
+}
+
+#ifndef WIRING // Wiring pre-defines signal handlers so don't define any if compiling for the Wiring platform
+
+  // Interrupt handlers for Arduino
+  #ifdef _useTimer1
+    SIGNAL(TIMER1_COMPA_vect) { handle_interrupts(_timer1, &TCNT1, &OCR1A); }
+  #endif
+
+  #ifdef _useTimer3
+    SIGNAL(TIMER3_COMPA_vect) { handle_interrupts(_timer3, &TCNT3, &OCR3A); }
+  #endif
+
+  #ifdef _useTimer4
+    SIGNAL(TIMER4_COMPA_vect) { handle_interrupts(_timer4, &TCNT4, &OCR4A); }
+  #endif
+
+  #ifdef _useTimer5
+    SIGNAL(TIMER5_COMPA_vect) { handle_interrupts(_timer5, &TCNT5, &OCR5A); }
+  #endif
+
+#else // WIRING
+
+  // Interrupt handlers for Wiring
+  #ifdef _useTimer1
+    void Timer1Service() { handle_interrupts(_timer1, &TCNT1, &OCR1A); }
+  #endif
+  #ifdef _useTimer3
+    void Timer3Service() { handle_interrupts(_timer3, &TCNT3, &OCR3A); }
+  #endif
+
+#endif // WIRING
+
+/****************** end of static functions ******************************/
+
+void initISR(const timer16_Sequence_t timer_index) {
+  switch (timer_index) {
+    default: break;
+
+    #ifdef _useTimer1
+      case _timer1:
+        TCCR1A = 0;             // normal counting mode
+        TCCR1B = _BV(CS11);     // set prescaler of 8
+        TCNT1 = 0;              // clear the timer count
+        #if defined(__AVR_ATmega8__) || defined(__AVR_ATmega128__)
+          SBI(TIFR, OCF1A);      // clear any pending interrupts;
+          SBI(TIMSK, OCIE1A);    // enable the output compare interrupt
+        #else
+          // here if not ATmega8 or ATmega128
+          SBI(TIFR1, OCF1A);     // clear any pending interrupts;
+          SBI(TIMSK1, OCIE1A);   // enable the output compare interrupt
+        #endif
+        #ifdef WIRING
+          timerAttach(TIMER1OUTCOMPAREA_INT, Timer1Service);
+        #endif
+        break;
+    #endif
+
+    #ifdef _useTimer3
+      case _timer3:
+        TCCR3A = 0;             // normal counting mode
+        TCCR3B = _BV(CS31);     // set prescaler of 8
+        TCNT3 = 0;              // clear the timer count
+        #ifdef __AVR_ATmega128__
+          SBI(TIFR, OCF3A);     // clear any pending interrupts;
+          SBI(ETIMSK, OCIE3A);  // enable the output compare interrupt
+        #else
+          SBI(TIFR3, OCF3A);   // clear any pending interrupts;
+          SBI(TIMSK3, OCIE3A); // enable the output compare interrupt
+        #endif
+        #ifdef WIRING
+          timerAttach(TIMER3OUTCOMPAREA_INT, Timer3Service);  // for Wiring platform only
+        #endif
+        break;
+    #endif
+
+    #ifdef _useTimer4
+      case _timer4:
+        TCCR4A = 0;             // normal counting mode
+        TCCR4B = _BV(CS41);     // set prescaler of 8
+        TCNT4 = 0;              // clear the timer count
+        TIFR4 = _BV(OCF4A);     // clear any pending interrupts;
+        TIMSK4 = _BV(OCIE4A);   // enable the output compare interrupt
+        break;
+    #endif
+
+    #ifdef _useTimer5
+      case _timer5:
+        TCCR5A = 0;             // normal counting mode
+        TCCR5B = _BV(CS51);     // set prescaler of 8
+        TCNT5 = 0;              // clear the timer count
+        TIFR5 = _BV(OCF5A);     // clear any pending interrupts;
+        TIMSK5 = _BV(OCIE5A);   // enable the output compare interrupt
+        break;
+    #endif
+  }
+}
+
+void finISR(const timer16_Sequence_t timer_index) {
+  // Disable use of the given timer
+  #ifdef WIRING
+    switch (timer_index) {
+      default: break;
+
+      case _timer1:
+        CBI(
+          #if defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__)
+            TIMSK1
+          #else
+            TIMSK
+          #endif
+          , OCIE1A    // disable timer 1 output compare interrupt
+        );
+        timerDetach(TIMER1OUTCOMPAREA_INT);
+        break;
+
+      case _timer3:
+        CBI(
+          #if defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__)
+            TIMSK3
+          #else
+            ETIMSK
+          #endif
+          , OCIE3A    // disable the timer3 output compare A interrupt
+        );
+        timerDetach(TIMER3OUTCOMPAREA_INT);
+        break;
+    }
+  #else // !WIRING
+    // For arduino - in future: call here to a currently undefined function to reset the timer
+    UNUSED(timer_index);
+  #endif
+}
+
+#endif // HAS_SERVOS
+
+#endif // __AVR__

Marlin/src/HAL/AVR/ServoTimers.h

@@ -0,0 +1,93 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * ServoTimers.h - Interrupt driven Servo library for Arduino using 16 bit timers- Version 2
+ * Copyright (c) 2009 Michael Margolis.  All right reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/**
+ * Defines for 16 bit timers used with  Servo library
+ *
+ * If _useTimerX is defined then TimerX is a 16 bit timer on the current board
+ * timer16_Sequence_t enumerates the sequence that the timers should be allocated
+ * _Nbr_16timers indicates how many 16 bit timers are available.
+ */
+
+/**
+ * AVR Only definitions
+ * --------------------
+ */
+
+#define TRIM_DURATION           2   // compensation ticks to trim adjust for digitalWrite delays
+#define SERVO_TIMER_PRESCALER   8   // timer prescaler
+
+// Say which 16 bit timers can be used and in what order
+#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+  //#define _useTimer1
+  #define _useTimer4
+  #if NUM_SERVOS > SERVOS_PER_TIMER
+    #define _useTimer3
+    #if !HAS_MOTOR_CURRENT_PWM && SERVOS > 2 * SERVOS_PER_TIMER
+      #define _useTimer5 // Timer 5 is used for motor current PWM and can't be used for servos.
+    #endif
+  #endif
+#elif defined(__AVR_ATmega32U4__)
+  #define _useTimer3
+#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
+  #define _useTimer3
+#elif defined(__AVR_ATmega128__) || defined(__AVR_ATmega1281__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega2561__)
+  #define _useTimer3
+#else
+  // everything else
+#endif
+
+typedef enum {
+  #ifdef _useTimer1
+    _timer1,
+  #endif
+  #ifdef _useTimer3
+    _timer3,
+  #endif
+  #ifdef _useTimer4
+    _timer4,
+  #endif
+  #ifdef _useTimer5
+    _timer5,
+  #endif
+  _Nbr_16timers
+} timer16_Sequence_t;

Marlin/src/HAL/AVR/eeprom.cpp

@@ -0,0 +1,74 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#ifdef __AVR__
+
+#include "../../inc/MarlinConfig.h"
+
+#if ANY(EEPROM_SETTINGS, SD_FIRMWARE_UPDATE)
+
+/**
+ * PersistentStore for Arduino-style EEPROM interface
+ * with implementations supplied by the framework.
+ */
+
+#include "../shared/eeprom_api.h"
+
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE size_t(E2END + 1)
+#endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE - eeprom_exclude_size; }
+bool PersistentStore::access_start()  { return true; }
+bool PersistentStore::access_finish() { return true; }
+
+bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
+  uint16_t written = 0;
+  while (size--) {
+    uint8_t * const p = (uint8_t * const)REAL_EEPROM_ADDR(pos);
+    uint8_t v = *value;
+    if (v != eeprom_read_byte(p)) { // EEPROM has only ~100,000 write cycles, so only write bytes that have changed!
+      eeprom_write_byte(p, v);
+      if (++written & 0x7F) delay(2); else safe_delay(2); // Avoid triggering watchdog during long EEPROM writes
+      if (eeprom_read_byte(p) != v) {
+        SERIAL_ECHO_MSG(STR_ERR_EEPROM_WRITE);
+        return true;
+      }
+    }
+    crc16(crc, &v, 1);
+    pos++;
+    value++;
+  }
+  return false;
+}
+
+bool PersistentStore::read_data(int &pos, uint8_t *value, size_t size, uint16_t *crc, const bool writing/*=true*/) {
+  do {
+    const uint8_t c = eeprom_read_byte((uint8_t*)REAL_EEPROM_ADDR(pos));
+    if (writing) *value = c;
+    crc16(crc, &c, 1);
+    pos++;
+    value++;
+  } while (--size);
+  return false;  // always assume success for AVR's
+}
+
+#endif // EEPROM_SETTINGS || SD_FIRMWARE_UPDATE
+#endif // __AVR__

Marlin/src/HAL/AVR/endstop_interrupts.h

@@ -0,0 +1,358 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * Endstop Interrupts
+ *
+ * Without endstop interrupts the endstop pins must be polled continually in
+ * the temperature-ISR via endstops.update(), most of the time finding no change.
+ * With this feature endstops.update() is called only when we know that at
+ * least one endstop has changed state, saving valuable CPU cycles.
+ *
+ * This feature only works when all used endstop pins can generate either an
+ * 'external interrupt' or a 'pin change interrupt'.
+ *
+ * Test whether pins issue interrupts on your board by flashing 'pin_interrupt_test.ino'.
+ * (Located in Marlin/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino)
+ */
+
+#include "../../module/endstops.h"
+
+#include <stdint.h>
+
+// One ISR for all EXT-Interrupts
+void endstop_ISR() { endstops.update(); }
+
+/**
+ * Patch for pins_arduino.h (...\Arduino\hardware\arduino\avr\variants\mega\pins_arduino.h)
+ *
+ * These macros for the Arduino MEGA do not include the two connected pins on Port J (D14, D15).
+ * So we extend them here because these are the normal pins for Y_MIN and Y_MAX on RAMPS.
+ * There are more PCI-enabled processor pins on Port J, but they are not connected to Arduino MEGA.
+ */
+#if defined(ARDUINO_AVR_MEGA2560) || defined(ARDUINO_AVR_MEGA)
+
+  #define digitalPinHasPCICR(p)   (WITHIN(p, 10, 15) || WITHIN(p, 50, 53) || WITHIN(p, 62, 69))
+
+  #undef  digitalPinToPCICR
+  #define digitalPinToPCICR(p)    (digitalPinHasPCICR(p) ? (&PCICR) : nullptr)
+
+  #undef  digitalPinToPCICRbit
+  #define digitalPinToPCICRbit(p) (WITHIN(p, 10, 13) || WITHIN(p, 50, 53) ? 0 : \
+                                   WITHIN(p, 14, 15) ? 1 : \
+                                   WITHIN(p, 62, 69) ? 2 : \
+                                   0)
+
+  #undef  digitalPinToPCMSK
+  #define digitalPinToPCMSK(p)    (WITHIN(p, 10, 13) || WITHIN(p, 50, 53) ? (&PCMSK0) : \
+                                   WITHIN(p, 14, 15) ? (&PCMSK1) : \
+                                   WITHIN(p, 62, 69) ? (&PCMSK2) : \
+                                   nullptr)
+
+  #undef  digitalPinToPCMSKbit
+  #define digitalPinToPCMSKbit(p) (WITHIN(p, 10, 13) ? ((p) - 6) : \
+                                   (p) == 14 || (p) == 51 ? 2 : \
+                                   (p) == 15 || (p) == 52 ? 1 : \
+                                   (p) == 50 ? 3 : \
+                                   (p) == 53 ? 0 : \
+                                   WITHIN(p, 62, 69) ? ((p) - 62) : \
+                                   0)
+
+#elif defined(__AVR_ATmega164A__) || defined(__AVR_ATmega164P__) || defined(__AVR_ATmega324A__) || \
+      defined(__AVR_ATmega324P__) || defined(__AVR_ATmega324PA__) || defined(__AVR_ATmega324PB__) || \
+      defined(__AVR_ATmega644A__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284__) || \
+      defined(__AVR_ATmega1284P__)
+
+  #define digitalPinHasPCICR(p)   WITHIN(p, 0, NUM_DIGITAL_PINS)
+
+#else
+
+  #error "Unsupported AVR variant!"
+
+#endif
+
+// Install Pin change interrupt for a pin. Can be called multiple times.
+void pciSetup(const int8_t pin) {
+  if (digitalPinHasPCICR(pin)) {
+    SBI(*digitalPinToPCMSK(pin), digitalPinToPCMSKbit(pin));  // enable pin
+    SBI(PCIFR, digitalPinToPCICRbit(pin)); // clear any outstanding interrupt
+    SBI(PCICR, digitalPinToPCICRbit(pin)); // enable interrupt for the group
+  }
+}
+
+// Handlers for pin change interrupts
+#ifdef PCINT0_vect
+  ISR(PCINT0_vect) { endstop_ISR(); }
+#endif
+
+#ifdef PCINT1_vect
+  ISR(PCINT1_vect, ISR_ALIASOF(PCINT0_vect));
+#endif
+
+#ifdef PCINT2_vect
+  ISR(PCINT2_vect, ISR_ALIASOF(PCINT0_vect));
+#endif
+
+#ifdef PCINT3_vect
+  ISR(PCINT3_vect, ISR_ALIASOF(PCINT0_vect));
+#endif
+
+void setup_endstop_interrupts() {
+  #define _ATTACH(P) attachInterrupt(digitalPinToInterrupt(P), endstop_ISR, CHANGE)
+  #if USE_X_MAX
+    #if (digitalPinToInterrupt(X_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(X_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(X_MAX_PIN), "X_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(X_MAX_PIN);
+    #endif
+  #endif
+  #if USE_X_MIN
+    #if (digitalPinToInterrupt(X_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(X_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(X_MIN_PIN), "X_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(X_MIN_PIN);
+    #endif
+  #endif
+  #if USE_Y_MAX
+    #if (digitalPinToInterrupt(Y_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Y_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Y_MAX_PIN), "Y_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Y_MAX_PIN);
+    #endif
+  #endif
+  #if USE_Y_MIN
+    #if (digitalPinToInterrupt(Y_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Y_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Y_MIN_PIN), "Y_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Y_MIN_PIN);
+    #endif
+  #endif
+  #if USE_Z_MAX
+    #if (digitalPinToInterrupt(Z_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Z_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Z_MAX_PIN), "Z_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Z_MAX_PIN);
+    #endif
+  #endif
+  #if USE_Z_MIN
+    #if (digitalPinToInterrupt(Z_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Z_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Z_MIN_PIN), "Z_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Z_MIN_PIN);
+    #endif
+  #endif
+  #if USE_I_MAX
+    #if (digitalPinToInterrupt(I_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(I_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(I_MAX_PIN), "I_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(I_MAX_PIN);
+    #endif
+  #elif USE_I_MIN
+    #if (digitalPinToInterrupt(I_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(I_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(I_MIN_PIN), "I_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(I_MIN_PIN);
+    #endif
+  #endif
+  #if USE_J_MAX
+    #if (digitalPinToInterrupt(J_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(J_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(J_MAX_PIN), "J_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(J_MAX_PIN);
+    #endif
+  #elif USE_J_MIN
+    #if (digitalPinToInterrupt(J_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(J_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(J_MIN_PIN), "J_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(J_MIN_PIN);
+    #endif
+  #endif
+  #if USE_K_MAX
+    #if (digitalPinToInterrupt(K_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(K_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(K_MAX_PIN), "K_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(K_MAX_PIN);
+    #endif
+  #elif USE_K_MIN
+    #if (digitalPinToInterrupt(K_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(K_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(K_MIN_PIN), "K_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(K_MIN_PIN);
+    #endif
+  #endif
+  #if USE_U_MAX
+    #if (digitalPinToInterrupt(U_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(U_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(U_MAX_PIN), "U_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(U_MAX_PIN);
+    #endif
+  #elif USE_U_MIN
+    #if (digitalPinToInterrupt(U_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(U_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(U_MIN_PIN), "U_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(U_MIN_PIN);
+    #endif
+  #endif
+  #if USE_V_MAX
+    #if (digitalPinToInterrupt(V_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(V_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(V_MAX_PIN), "V_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(V_MAX_PIN);
+    #endif
+  #elif USE_V_MIN
+    #if (digitalPinToInterrupt(V_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(V_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(V_MIN_PIN), "V_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(V_MIN_PIN);
+    #endif
+  #endif
+  #if USE_W_MAX
+    #if (digitalPinToInterrupt(W_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(W_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(W_MAX_PIN), "W_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(W_MAX_PIN);
+    #endif
+  #elif USE_W_MIN
+    #if (digitalPinToInterrupt(W_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(W_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(W_MIN_PIN), "W_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(W_MIN_PIN);
+    #endif
+  #endif
+  #if USE_X2_MAX
+    #if (digitalPinToInterrupt(X2_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(X2_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(X2_MAX_PIN), "X2_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(X2_MAX_PIN);
+    #endif
+  #endif
+  #if USE_X2_MIN
+    #if (digitalPinToInterrupt(X2_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(X2_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(X2_MIN_PIN), "X2_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(X2_MIN_PIN);
+    #endif
+  #endif
+  #if USE_Y2_MAX
+    #if (digitalPinToInterrupt(Y2_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Y2_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Y2_MAX_PIN), "Y2_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Y2_MAX_PIN);
+    #endif
+  #endif
+  #if USE_Y2_MIN
+    #if (digitalPinToInterrupt(Y2_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Y2_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Y2_MIN_PIN), "Y2_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Y2_MIN_PIN);
+    #endif
+  #endif
+  #if USE_Z2_MAX
+    #if (digitalPinToInterrupt(Z2_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Z2_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Z2_MAX_PIN), "Z2_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Z2_MAX_PIN);
+    #endif
+  #endif
+  #if USE_Z2_MIN
+    #if (digitalPinToInterrupt(Z2_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Z2_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Z2_MIN_PIN), "Z2_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Z2_MIN_PIN);
+    #endif
+  #endif
+  #if USE_Z3_MAX
+    #if (digitalPinToInterrupt(Z3_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Z3_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Z3_MAX_PIN), "Z3_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Z3_MAX_PIN);
+    #endif
+  #endif
+  #if USE_Z3_MIN
+    #if (digitalPinToInterrupt(Z3_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Z3_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Z3_MIN_PIN), "Z3_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Z3_MIN_PIN);
+    #endif
+  #endif
+  #if USE_Z4_MAX
+    #if (digitalPinToInterrupt(Z4_MAX_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Z4_MAX_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Z4_MAX_PIN), "Z4_MAX_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Z4_MAX_PIN);
+    #endif
+  #endif
+  #if USE_Z4_MIN
+    #if (digitalPinToInterrupt(Z4_MIN_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Z4_MIN_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Z4_MIN_PIN), "Z4_MIN_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Z4_MIN_PIN);
+    #endif
+  #endif
+  #if USE_Z_MIN_PROBE
+    #if (digitalPinToInterrupt(Z_MIN_PROBE_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(Z_MIN_PROBE_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(Z_MIN_PROBE_PIN), "Z_MIN_PROBE_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(Z_MIN_PROBE_PIN);
+    #endif
+  #endif
+  #if USE_CALIBRATION
+    #if (digitalPinToInterrupt(CALIBRATION_PIN) != NOT_AN_INTERRUPT)
+      _ATTACH(CALIBRATION_PIN);
+    #else
+      static_assert(digitalPinHasPCICR(CALIBRATION_PIN), "CALIBRATION_PIN is not interrupt-capable. Disable ENDSTOP_INTERRUPTS_FEATURE to continue.");
+      pciSetup(CALIBRATION_PIN);
+    #endif
+  #endif
+
+  // If we arrive here without raising an assertion, each pin has either an EXT-interrupt or a PCI.
+}

Marlin/src/HAL/AVR/fast_pwm.cpp

@@ -0,0 +1,239 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#ifdef __AVR__
+
+#include "../../inc/MarlinConfig.h"
+
+//#define DEBUG_AVR_FAST_PWM
+#define DEBUG_OUT ENABLED(DEBUG_AVR_FAST_PWM)
+#include "../../core/debug_out.h"
+
+struct Timer {
+  volatile uint8_t* TCCRnQ[3];  // max 3 TCCR registers per timer
+  volatile uint16_t* OCRnQ[3];  // max 3 OCR registers per timer
+  volatile uint16_t* ICRn;      // max 1 ICR register per timer
+  uint8_t n;                    // the timer number [0->5]
+  uint8_t q;                    // the timer output [0->2] (A->C)
+  bool isPWM;                   // True if pin is a "hardware timer"
+  bool isProtected;             // True if timer is protected
+};
+
+// Macros for the Timer structure
+#define _SET_WGMnQ(T, V) do{ \
+    *(T.TCCRnQ)[0] = (*(T.TCCRnQ)[0] & ~(0x3 << 0)) | (( int(V)       & 0x3) << 0); \
+    *(T.TCCRnQ)[1] = (*(T.TCCRnQ)[1] & ~(0x3 << 3)) | (((int(V) >> 2) & 0x3) << 3); \
+  }while(0)
+
+// Set TCCR CS bits
+#define _SET_CSn(T, V) (*(T.TCCRnQ)[1] = (*(T.TCCRnQ[1]) & ~(0x7 << 0)) | ((int(V) & 0x7) << 0))
+
+// Set TCCR COM bits
+#define _SET_COMnQ(T, Q, V) (*(T.TCCRnQ)[0] = (*(T.TCCRnQ)[0] & ~(0x3 << (6-2*(Q)))) | (int(V) << (6-2*(Q))))
+
+// Set OCRnQ register
+#define _SET_OCRnQ(T, Q, V) (*(T.OCRnQ)[Q] = int(V) & 0xFFFF)
+
+// Set ICRn register (one per timer)
+#define _SET_ICRn(T, V) (*(T.ICRn) = int(V) & 0xFFFF)
+
+/**
+ * Return a Timer struct describing a pin's timer.
+ */
+const Timer get_pwm_timer(const pin_t pin) {
+
+  uint8_t q = 0;
+
+  switch (digitalPinToTimer(pin)) {
+    #ifdef TCCR0A
+      IF_DISABLED(AVR_AT90USB1286_FAMILY, case TIMER0A:)
+    #endif
+    #ifdef TCCR1A
+      case TIMER1A: case TIMER1B:
+    #endif
+
+    break;    // Protect reserved timers (TIMER0 & TIMER1)
+
+    #ifdef TCCR0A
+      case TIMER0B:   // Protected timer, but allow setting the duty cycle on OCR0B for pin D4 only
+        return Timer({ { &TCCR0A, nullptr, nullptr }, { (uint16_t*)&OCR0A, (uint16_t*)&OCR0B, nullptr }, nullptr, 0, 1, true, true });
+    #endif
+
+    #if HAS_TCCR2
+      case TIMER2:
+        return Timer({ { &TCCR2, nullptr, nullptr }, { (uint16_t*)&OCR2, nullptr, nullptr }, nullptr, 2, 0, true, false });
+    #elif ENABLED(USE_OCR2A_AS_TOP)
+      case TIMER2A: break; // Protect TIMER2A since its OCR is used by TIMER2B
+      case TIMER2B:
+        return Timer({ { &TCCR2A, &TCCR2B, nullptr }, { (uint16_t*)&OCR2A, (uint16_t*)&OCR2B, nullptr }, nullptr, 2, 1, true, false });
+    #elif defined(TCCR2A)
+      case TIMER2B: ++q; case TIMER2A:
+        return Timer({ { &TCCR2A, &TCCR2B, nullptr }, { (uint16_t*)&OCR2A, (uint16_t*)&OCR2B, nullptr }, nullptr, 2, q, true, false });
+    #endif
+
+    #ifdef OCR3C
+      case TIMER3C: ++q; case TIMER3B: ++q; case TIMER3A:
+        return Timer({ { &TCCR3A, &TCCR3B, &TCCR3C }, { &OCR3A, &OCR3B, &OCR3C  }, &ICR3, 3, q, true, false });
+    #elif defined(OCR3B)
+      case TIMER3B: ++q; case TIMER3A:
+        return Timer({ { &TCCR3A, &TCCR3B, nullptr }, { &OCR3A, &OCR3B, nullptr }, &ICR3, 3, q, true, false });
+    #endif
+
+    #ifdef TCCR4A
+      case TIMER4C: ++q; case TIMER4B: ++q; case TIMER4A:
+        return Timer({ { &TCCR4A, &TCCR4B, &TCCR4C }, { &OCR4A, &OCR4B, &OCR4C }, &ICR4, 4, q, true, false });
+    #endif
+
+    #ifdef TCCR5A
+      case TIMER5C: ++q; case TIMER5B: ++q; case TIMER5A:
+        return Timer({ { &TCCR5A, &TCCR5B, &TCCR5C }, { &OCR5A, &OCR5B, &OCR5C }, &ICR5, 5, q, true, false });
+    #endif
+  }
+
+  return Timer();
+}
+
+void MarlinHAL::set_pwm_frequency(const pin_t pin, const uint16_t f_desired) {
+  DEBUG_ECHOLNPGM("set_pwm_frequency(pin=", pin, ", freq=", f_desired, ")");
+  const Timer timer = get_pwm_timer(pin);
+  if (timer.isProtected || !timer.isPWM) return; // Don't proceed if protected timer or not recognized
+
+  const bool is_timer2 = timer.n == 2;
+  const uint16_t maxtop = is_timer2 ? 0xFF : 0xFFFF;
+
+  DEBUG_ECHOLNPGM("maxtop=", maxtop);
+
+  uint16_t res = 0xFF;        // resolution (TOP value)
+  uint8_t j = CS_NONE;        // prescaler index
+  uint8_t wgm = WGM_PWM_PC_8; // waveform generation mode
+
+  // Calculating the prescaler and resolution to use to achieve closest frequency
+  if (f_desired != 0) {
+    constexpr uint16_t prescaler[] = { 1, 8, (32), 64, (128), 256, 1024 };  // (*) are Timer 2 only
+    uint16_t f = (F_CPU) / (uint32_t(maxtop) << 11) + 1;      // Start with the lowest non-zero frequency achievable (for 16MHz, 1 or 31)
+
+    DEBUG_ECHOLNPGM("f=", f);
+    DEBUG_ECHOLNPGM("(prescaler loop)");
+    for (uint8_t i = 0; i < COUNT(prescaler); ++i) {          // Loop through all prescaler values
+      const uint32_t p = prescaler[i];                        // Extend to 32 bits for calculations
+      DEBUG_ECHOLNPGM("prescaler[", i, "]=", p);
+      uint16_t res_fast_temp, res_pc_temp;
+      if (is_timer2) {
+        #if ENABLED(USE_OCR2A_AS_TOP)                         // No resolution calculation for TIMER2 unless enabled USE_OCR2A_AS_TOP
+          const uint16_t rft = (F_CPU) / (p * f_desired);
+          res_fast_temp = rft - 1;
+          res_pc_temp = rft / 2;
+          DEBUG_ECHOLNPGM("(Timer2) res_fast_temp=", res_fast_temp, " res_pc_temp=", res_pc_temp);
+        #else
+          res_fast_temp = res_pc_temp = maxtop;
+          DEBUG_ECHOLNPGM("(Timer2) res_fast_temp=", maxtop, " res_pc_temp=", maxtop);
+        #endif
+      }
+      else {
+        if (p == 32 || p == 128) continue;                    // Skip TIMER2 specific prescalers when not TIMER2
+        const uint16_t rft = (F_CPU) / (p * f_desired);
+        DEBUG_ECHOLNPGM("(Not Timer 2) F_CPU=", STRINGIFY(F_CPU), " prescaler=", p, " f_desired=", f_desired);
+        res_fast_temp = rft - 1;
+        res_pc_temp = rft / 2;
+      }
+
+      LIMIT(res_fast_temp, 1U, maxtop);
+      LIMIT(res_pc_temp, 1U, maxtop);
+
+      // Calculate frequencies of test prescaler and resolution values
+      const uint16_t f_fast_temp = (F_CPU) / (p * (1 + res_fast_temp)),
+                     f_pc_temp   = (F_CPU) / ((p * res_pc_temp) << 1),
+                     f_diff      = _MAX(f, f_desired) - _MIN(f, f_desired),
+                     f_fast_diff = _MAX(f_fast_temp, f_desired) - _MIN(f_fast_temp, f_desired),
+                     f_pc_diff   = _MAX(f_pc_temp, f_desired) - _MIN(f_pc_temp, f_desired);
+
+      DEBUG_ECHOLNPGM("f_fast_temp=", f_fast_temp, " f_pc_temp=", f_pc_temp, " f_diff=", f_diff, " f_fast_diff=", f_fast_diff, " f_pc_diff=", f_pc_diff);
+
+      if (f_fast_diff < f_diff && f_fast_diff <= f_pc_diff) { // FAST values are closest to desired f
+        // Set the Wave Generation Mode to FAST PWM
+        wgm = is_timer2 ? uint8_t(TERN(USE_OCR2A_AS_TOP, WGM2_FAST_PWM_OCR2A, WGM2_FAST_PWM)) : uint8_t(WGM_FAST_PWM_ICRn);
+        // Remember this combination
+        f = f_fast_temp; res = res_fast_temp; j = i + 1;
+        DEBUG_ECHOLNPGM("(FAST) updated f=", f);
+      }
+      else if (f_pc_diff < f_diff) {                          // PHASE CORRECT values are closes to desired f
+        // Set the Wave Generation Mode to PWM PHASE CORRECT
+        wgm = is_timer2 ? uint8_t(TERN(USE_OCR2A_AS_TOP, WGM2_PWM_PC_OCR2A, WGM2_PWM_PC)) : uint8_t(WGM_PWM_PC_ICRn);
+        f = f_pc_temp; res = res_pc_temp; j = i + 1;
+        DEBUG_ECHOLNPGM("(PHASE) updated f=", f);
+      }
+    } // prescaler loop
+  }
+
+  _SET_WGMnQ(timer, wgm);
+  _SET_CSn(timer, j);
+
+  if (is_timer2) {
+    TERN_(USE_OCR2A_AS_TOP, _SET_OCRnQ(timer, 0, res)); // Set OCR2A value (TOP) = res
+  }
+  else
+    _SET_ICRn(timer, res);                              // Set ICRn value (TOP) = res
+}
+
+void MarlinHAL::set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) {
+  // If v is 0 or v_size (max), digitalWrite to LOW or HIGH.
+  // Note that digitalWrite also disables PWM output for us (sets COM bit to 0)
+  if (v == 0)
+    digitalWrite(pin, invert);
+  else if (v == v_size)
+    digitalWrite(pin, !invert);
+  else {
+    const Timer timer = get_pwm_timer(pin);
+    if (timer.isPWM) {
+      if (timer.n == 0) {
+        _SET_COMnQ(timer, timer.q, COM_CLEAR_SET);  // Only allow a TIMER0B select...
+        _SET_OCRnQ(timer, timer.q, v);              // ...and OCR0B duty update. For output pin D4 no frequency changes are permitted.
+      }
+      else if (!timer.isProtected) {
+        const uint16_t top = timer.n == 2 ? TERN(USE_OCR2A_AS_TOP, *timer.OCRnQ[0], 255) : *timer.ICRn;
+        _SET_COMnQ(timer, SUM_TERN(HAS_TCCR2, timer.q, timer.q == 2), COM_CLEAR_SET + invert);   // COM20 is on bit 4 of TCCR2, so +1 for q==2
+        _SET_OCRnQ(timer, timer.q, uint16_t(uint32_t(v) * top / v_size)); // Scale 8/16-bit v to top value
+      }
+    }
+    else
+      digitalWrite(pin, v < v_size / 2 ? LOW : HIGH);
+  }
+}
+
+void MarlinHAL::init_pwm_timers() {
+  // Init some timer frequencies to a default 1KHz
+  const pin_t pwm_pin[] = {
+    #ifdef __AVR_ATmega2560__
+      10, 5, 6, 46
+    #elif defined(__AVR_ATmega1280__)
+      12, 31
+    #elif defined(__AVR_ATmega644__) || defined(__AVR_ATmega1284__)
+      15, 6
+    #elif defined(__AVR_AT90USB1286__) || defined(__AVR_mega64) || defined(__AVR_mega128)
+      16, 24
+    #endif
+  };
+
+  for (uint8_t i = 0; i < COUNT(pwm_pin); ++i)
+    set_pwm_frequency(pwm_pin[i], 1000);
+}
+
+#endif // __AVR__

Marlin/src/HAL/AVR/fastio.cpp

@@ -0,0 +1,288 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Fast I/O for extended pins
+ */
+
+#ifdef __AVR__
+
+#include "fastio.h"
+
+#ifdef FASTIO_EXT_START
+
+#include "../shared/Marduino.h"
+
+#define _IS_EXT(P) WITHIN(P, FASTIO_EXT_START, FASTIO_EXT_END)
+
+void extDigitalWrite(const int8_t pin, const uint8_t state) {
+  #define _WCASE(N) case N: WRITE(N, state); break
+  switch (pin) {
+    default: digitalWrite(pin, state);
+    #if _IS_EXT(70)
+      _WCASE(70);
+    #endif
+    #if _IS_EXT(71)
+      _WCASE(71);
+    #endif
+    #if _IS_EXT(72)
+      _WCASE(72);
+    #endif
+    #if _IS_EXT(73)
+      _WCASE(73);
+    #endif
+    #if _IS_EXT(74)
+      _WCASE(74);
+    #endif
+    #if _IS_EXT(75)
+      _WCASE(75);
+    #endif
+    #if _IS_EXT(76)
+      _WCASE(76);
+    #endif
+    #if _IS_EXT(77)
+      _WCASE(77);
+    #endif
+    #if _IS_EXT(78)
+      _WCASE(78);
+    #endif
+    #if _IS_EXT(79)
+      _WCASE(79);
+    #endif
+    #if _IS_EXT(80)
+      _WCASE(80);
+    #endif
+    #if _IS_EXT(81)
+      _WCASE(81);
+    #endif
+    #if _IS_EXT(82)
+      _WCASE(82);
+    #endif
+    #if _IS_EXT(83)
+      _WCASE(83);
+    #endif
+    #if _IS_EXT(84)
+      _WCASE(84);
+    #endif
+    #if _IS_EXT(85)
+      _WCASE(85);
+    #endif
+    #if _IS_EXT(86)
+      _WCASE(86);
+    #endif
+    #if _IS_EXT(87)
+      _WCASE(87);
+    #endif
+    #if _IS_EXT(88)
+      _WCASE(88);
+    #endif
+    #if _IS_EXT(89)
+      _WCASE(89);
+    #endif
+    #if _IS_EXT(90)
+      _WCASE(90);
+    #endif
+    #if _IS_EXT(91)
+      _WCASE(91);
+    #endif
+    #if _IS_EXT(92)
+      _WCASE(92);
+    #endif
+    #if _IS_EXT(93)
+      _WCASE(93);
+    #endif
+    #if _IS_EXT(94)
+      _WCASE(94);
+    #endif
+    #if _IS_EXT(95)
+      _WCASE(95);
+    #endif
+    #if _IS_EXT(96)
+      _WCASE(96);
+    #endif
+    #if _IS_EXT(97)
+      _WCASE(97);
+    #endif
+    #if _IS_EXT(98)
+      _WCASE(98);
+    #endif
+    #if _IS_EXT(99)
+      _WCASE(99);
+    #endif
+    #if _IS_EXT(100)
+      _WCASE(100);
+    #endif
+  }
+}
+
+uint8_t extDigitalRead(const int8_t pin) {
+  #define _RCASE(N) case N: return READ(N)
+  switch (pin) {
+    default: return digitalRead(pin);
+    #if _IS_EXT(70)
+      _RCASE(70);
+    #endif
+    #if _IS_EXT(71)
+      _RCASE(71);
+    #endif
+    #if _IS_EXT(72)
+      _RCASE(72);
+    #endif
+    #if _IS_EXT(73)
+      _RCASE(73);
+    #endif
+    #if _IS_EXT(74)
+      _RCASE(74);
+    #endif
+    #if _IS_EXT(75)
+      _RCASE(75);
+    #endif
+    #if _IS_EXT(76)
+      _RCASE(76);
+    #endif
+    #if _IS_EXT(77)
+      _RCASE(77);
+    #endif
+    #if _IS_EXT(78)
+      _RCASE(78);
+    #endif
+    #if _IS_EXT(79)
+      _RCASE(79);
+    #endif
+    #if _IS_EXT(80)
+      _RCASE(80);
+    #endif
+    #if _IS_EXT(81)
+      _RCASE(81);
+    #endif
+    #if _IS_EXT(82)
+      _RCASE(82);
+    #endif
+    #if _IS_EXT(83)
+      _RCASE(83);
+    #endif
+    #if _IS_EXT(84)
+      _RCASE(84);
+    #endif
+    #if _IS_EXT(85)
+      _RCASE(85);
+    #endif
+    #if _IS_EXT(86)
+      _RCASE(86);
+    #endif
+    #if _IS_EXT(87)
+      _RCASE(87);
+    #endif
+    #if _IS_EXT(88)
+      _RCASE(88);
+    #endif
+    #if _IS_EXT(89)
+      _RCASE(89);
+    #endif
+    #if _IS_EXT(90)
+      _RCASE(90);
+    #endif
+    #if _IS_EXT(91)
+      _RCASE(91);
+    #endif
+    #if _IS_EXT(92)
+      _RCASE(92);
+    #endif
+    #if _IS_EXT(93)
+      _RCASE(93);
+    #endif
+    #if _IS_EXT(94)
+      _RCASE(94);
+    #endif
+    #if _IS_EXT(95)
+      _RCASE(95);
+    #endif
+    #if _IS_EXT(96)
+      _RCASE(96);
+    #endif
+    #if _IS_EXT(97)
+      _RCASE(97);
+    #endif
+    #if _IS_EXT(98)
+      _RCASE(98);
+    #endif
+    #if _IS_EXT(99)
+      _RCASE(99);
+    #endif
+    #if _IS_EXT(100)
+      _RCASE(100);
+    #endif
+  }
+}
+
+#if 0
+/**
+ * Set Timer 5 PWM frequency in Hz, from 3.8Hz up to ~16MHz
+ * with a minimum resolution of 100 steps.
+ *
+ * DC values -1.0 to 1.0. Negative duty cycle inverts the pulse.
+ */
+uint16_t set_pwm_frequency_hz(const float hz, const float dca, const float dcb, const float dcc) {
+  float count = 0;
+  if (hz > 0 && (dca || dcb || dcc)) {
+    count = float(F_CPU) / hz;            // 1x prescaler, TOP for 16MHz base freq.
+    uint16_t prescaler;                   // Range of 30.5Hz (65535) 64.5kHz (>31)
+
+         if (count >= 255. * 256.) { prescaler = 1024; SET_CS(5, PRESCALER_1024); }
+    else if (count >= 255. * 64.)  { prescaler = 256;  SET_CS(5,  PRESCALER_256); }
+    else if (count >= 255. * 8.)   { prescaler = 64;   SET_CS(5,   PRESCALER_64); }
+    else if (count >= 255.)        { prescaler = 8;    SET_CS(5,    PRESCALER_8); }
+    else                           { prescaler = 1;    SET_CS(5,    PRESCALER_1); }
+
+    count /= float(prescaler);
+    const float pwm_top = roundf(count);   // Get the rounded count
+
+    ICR5 = (uint16_t)pwm_top - 1;         // Subtract 1 for TOP
+    OCR5A = pwm_top * ABS(dca);           // Update and scale DCs
+    OCR5B = pwm_top * ABS(dcb);
+    OCR5C = pwm_top * ABS(dcc);
+    _SET_COM(5, A, dca ? (dca < 0 ? COM_SET_CLEAR : COM_CLEAR_SET) : COM_NORMAL); // Set compare modes
+    _SET_COM(5, B, dcb ? (dcb < 0 ? COM_SET_CLEAR : COM_CLEAR_SET) : COM_NORMAL);
+    _SET_COM(5, C, dcc ? (dcc < 0 ? COM_SET_CLEAR : COM_CLEAR_SET) : COM_NORMAL);
+
+    SET_WGM(5, FAST_PWM_ICRn);            // Fast PWM with ICR5 as TOP
+
+    //SERIAL_ECHOLNPGM("Timer 5 Settings:");
+    //SERIAL_ECHOLNPGM("  Prescaler=", prescaler);
+    //SERIAL_ECHOLNPGM("        TOP=", ICR5);
+    //SERIAL_ECHOLNPGM("      OCR5A=", OCR5A);
+    //SERIAL_ECHOLNPGM("      OCR5B=", OCR5B);
+    //SERIAL_ECHOLNPGM("      OCR5C=", OCR5C);
+  }
+  else {
+    // Restore the default for Timer 5
+    SET_WGM(5, PWM_PC_8);                 // PWM 8-bit (Phase Correct)
+    SET_COMS(5, NORMAL, NORMAL, NORMAL);  // Do nothing
+    SET_CS(5, PRESCALER_64);              // 16MHz / 64 = 250kHz
+    OCR5A = OCR5B = OCR5C = 0;
+  }
+  return roundf(count);
+}
+#endif
+
+#endif // FASTIO_EXT_START
+#endif // __AVR__

Marlin/src/HAL/AVR/fastio.h

@@ -0,0 +1,272 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * Fast I/O Routines for AVR
+ * Use direct port manipulation to save scads of processor time.
+ * Contributed by Triffid_Hunter and modified by Kliment, thinkyhead, Bob-the-Kuhn, et.al.
+ */
+
+#include <avr/io.h>
+
+#if defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1286P__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB646P__) || defined(__AVR_AT90USB647__)
+  #define AVR_AT90USB1286_FAMILY 1
+#elif defined(__AVR_ATmega644__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__) || defined(__AVR_ATmega1284P__)
+  #define AVR_ATmega1284_FAMILY 1
+#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+  #define AVR_ATmega2560_FAMILY 1
+#elif defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__)
+  #define AVR_ATmega2561_FAMILY 1
+#elif defined(__AVR_ATmega168__) || defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__)
+  #define AVR_ATmega328_FAMILY 1
+#endif
+
+/**
+ * Include Ports and Functions
+ */
+#if AVR_ATmega328_FAMILY
+  #include "fastio/fastio_168.h"
+#elif AVR_ATmega1284_FAMILY
+  #include "fastio/fastio_644.h"
+#elif AVR_ATmega2560_FAMILY
+  #include "fastio/fastio_1280.h"
+#elif AVR_AT90USB1286_FAMILY
+  #include "fastio/fastio_AT90USB.h"
+#elif AVR_ATmega2561_FAMILY
+  #include "fastio/fastio_1281.h"
+#else
+  #error "No FastIO definition for the selected AVR Board."
+#endif
+
+/**
+ * Magic I/O routines
+ *
+ * Now you can simply SET_OUTPUT(PIN); WRITE(PIN, HIGH); WRITE(PIN, LOW);
+ *
+ * Why double up on these macros? see https://gcc.gnu.org/onlinedocs/cpp/Stringification.html
+ */
+
+#define _READ(IO)             TEST(DIO ## IO ## _RPORT, DIO ## IO ## _PIN)
+
+#define _WRITE_NC(IO,V) do{ \
+  if (V) SBI(DIO ## IO ## _WPORT, DIO ## IO ## _PIN); \
+  else   CBI(DIO ## IO ## _WPORT, DIO ## IO ## _PIN); \
+}while(0)
+
+#define _WRITE_C(IO,V) do{ \
+  uint8_t port_bits = DIO ## IO ## _WPORT;                  /* Get a mask from the current port bits */ \
+  if (V) port_bits = ~port_bits;                            /* For setting bits, invert the mask */ \
+  DIO ## IO ## _RPORT = port_bits & _BV(DIO ## IO ## _PIN); /* Atomically toggle the output port bits */ \
+}while(0)
+
+#define _WRITE(IO,V)          do{ if (&(DIO ## IO ## _RPORT) < (uint8_t*)0x100) _WRITE_NC(IO,V); else _WRITE_C(IO,V); }while(0)
+
+#define _TOGGLE(IO)           (DIO ## IO ## _RPORT = _BV(DIO ## IO ## _PIN))
+
+#define _SET_INPUT(IO)        CBI(DIO ## IO ## _DDR, DIO ## IO ## _PIN)
+#define _SET_OUTPUT(IO)       SBI(DIO ## IO ## _DDR, DIO ## IO ## _PIN)
+
+#define _IS_INPUT(IO)         !TEST(DIO ## IO ## _DDR, DIO ## IO ## _PIN)
+#define _IS_OUTPUT(IO)        TEST(DIO ## IO ## _DDR, DIO ## IO ## _PIN)
+
+// digitalRead/Write wrappers
+#ifdef FASTIO_EXT_START
+  void extDigitalWrite(const int8_t pin, const uint8_t state);
+  uint8_t extDigitalRead(const int8_t pin);
+#else
+  #define extDigitalWrite(IO,V) digitalWrite(IO,V)
+  #define extDigitalRead(IO)    digitalRead(IO)
+#endif
+
+#define READ(IO)              _READ(IO)
+#define WRITE(IO,V)           _WRITE(IO,V)
+#define TOGGLE(IO)            _TOGGLE(IO)
+
+#define SET_INPUT(IO)         _SET_INPUT(IO)
+#define SET_INPUT_PULLUP(IO)  do{ _SET_INPUT(IO); _WRITE(IO, HIGH); }while(0)
+#define SET_INPUT_PULLDOWN    SET_INPUT
+#define SET_OUTPUT(IO)        _SET_OUTPUT(IO)
+#define SET_PWM               SET_OUTPUT
+
+#define IS_INPUT(IO)          _IS_INPUT(IO)
+#define IS_OUTPUT(IO)         _IS_OUTPUT(IO)
+
+#define OUT_WRITE(IO,V)       do{ SET_OUTPUT(IO); WRITE(IO,V); }while(0)
+
+/**
+ * Timer and Interrupt Control
+ */
+
+// Waveform Generation Modes
+enum WaveGenMode : uint8_t {
+  WGM_NORMAL,          //  0
+  WGM_PWM_PC_8,        //  1
+  WGM_PWM_PC_9,        //  2
+  WGM_PWM_PC_10,       //  3
+  WGM_CTC_OCRnA,       //  4  COM OCnx
+  WGM_FAST_PWM_8,      //  5
+  WGM_FAST_PWM_9,      //  6
+  WGM_FAST_PWM_10,     //  7
+  WGM_PWM_PC_FC_ICRn,  //  8
+  WGM_PWM_PC_FC_OCRnA, //  9  COM OCnA
+  WGM_PWM_PC_ICRn,     // 10
+  WGM_PWM_PC_OCRnA,    // 11  COM OCnA
+  WGM_CTC_ICRn,        // 12  COM OCnx
+  WGM_reserved,        // 13
+  WGM_FAST_PWM_ICRn,   // 14  COM OCnA
+  WGM_FAST_PWM_OCRnA   // 15  COM OCnA
+};
+
+// Wavefore Generation Modes (Timer 2 only)
+enum WaveGenMode2 : uint8_t {
+  WGM2_NORMAL,         // 0
+  WGM2_PWM_PC,         // 1
+  WGM2_CTC_OCR2A,      // 2
+  WGM2_FAST_PWM,       // 3
+  WGM2_reserved_1,     // 4
+  WGM2_PWM_PC_OCR2A,   // 5
+  WGM2_reserved_2,     // 6
+  WGM2_FAST_PWM_OCR2A, // 7
+};
+
+// Compare Modes
+enum CompareMode : uint8_t {
+  COM_NORMAL,          //  0
+  COM_TOGGLE,          //  1  Non-PWM: OCnx ... Both PWM (WGM 9,11,14,15): OCnA only ... else NORMAL
+  COM_CLEAR_SET,       //  2  Non-PWM: OCnx ... Fast PWM: OCnx/Bottom ... PF-FC: OCnx Up/Down
+  COM_SET_CLEAR        //  3  Non-PWM: OCnx ... Fast PWM: OCnx/Bottom ... PF-FC: OCnx Up/Down
+};
+
+// Clock Sources
+enum ClockSource : uint8_t {
+  CS_NONE,             //  0
+  CS_PRESCALER_1,      //  1
+  CS_PRESCALER_8,      //  2
+  CS_PRESCALER_64,     //  3
+  CS_PRESCALER_256,    //  4
+  CS_PRESCALER_1024,   //  5
+  CS_EXT_FALLING,      //  6
+  CS_EXT_RISING        //  7
+};
+
+// Clock Sources (Timer 2 only)
+enum ClockSource2 : uint8_t {
+  CS2_NONE,            //  0
+  CS2_PRESCALER_1,     //  1
+  CS2_PRESCALER_8,     //  2
+  CS2_PRESCALER_32,    //  3
+  CS2_PRESCALER_64,    //  4
+  CS2_PRESCALER_128,   //  5
+  CS2_PRESCALER_256,   //  6
+  CS2_PRESCALER_1024   //  7
+};
+
+// Get interrupt bits in an orderly way
+// Ex: cs = GET_CS(0); coma1 = GET_COM(A,1);
+#define GET_WGM(T)   (((TCCR##T##A >> WGM##T##0) & 0x3) | ((TCCR##T##B >> WGM##T##2 << 2) & 0xC))
+#define GET_CS(T)    ((TCCR##T##B >> CS##T##0) & 0x7)
+#define GET_COM(T,Q) ((TCCR##T##Q >> COM##T##Q##0) & 0x3)
+#define GET_COMA(T)  GET_COM(T,A)
+#define GET_COMB(T)  GET_COM(T,B)
+#define GET_COMC(T)  GET_COM(T,C)
+#define GET_ICNC(T)  (!!(TCCR##T##B & _BV(ICNC##T)))
+#define GET_ICES(T)  (!!(TCCR##T##B & _BV(ICES##T)))
+#define GET_FOC(T,Q) (!!(TCCR##T##C & _BV(FOC##T##Q)))
+#define GET_FOCA(T)  GET_FOC(T,A)
+#define GET_FOCB(T)  GET_FOC(T,B)
+#define GET_FOCC(T)  GET_FOC(T,C)
+
+// Set Wave Generation Mode bits
+// Ex: SET_WGM(5,CTC_ICRn);
+#define _SET_WGM(T,V) do{ \
+    TCCR##T##A = (TCCR##T##A & ~(0x3 << WGM##T##0)) | (( int(V)       & 0x3) << WGM##T##0); \
+    TCCR##T##B = (TCCR##T##B & ~(0x3 << WGM##T##2)) | (((int(V) >> 2) & 0x3) << WGM##T##2); \
+  }while(0)
+#define SET_WGM(T,V) _SET_WGM(T,WGM_##V)
+
+// Set Clock Select bits
+// Ex: SET_CS3(PRESCALER_64);
+#ifdef TCCR2
+  #define HAS_TCCR2 1
+#endif
+#define _SET_CS(T,V) (TCCR##T##B = (TCCR##T##B & ~(0x7 << CS##T##0)) | ((int(V) & 0x7) << CS##T##0))
+#define _SET_CS0(V) _SET_CS(0,V)
+#define _SET_CS1(V) _SET_CS(1,V)
+#define _SET_CS3(V) _SET_CS(3,V)
+#define _SET_CS4(V) _SET_CS(4,V)
+#define _SET_CS5(V) _SET_CS(5,V)
+#define SET_CS0(V) _SET_CS0(CS_##V)
+#define SET_CS1(V) _SET_CS1(CS_##V)
+
+#if HAS_TCCR2
+  #define _SET_CS2(V) (TCCR2 = (TCCR2 & ~(0x7 << CS20)) | (int(V) << CS20))
+  #define SET_CS2(V) _SET_CS2(CS2_##V)
+#else
+  #define _SET_CS2(V) _SET_CS(2,V)
+  #define SET_CS2(V) _SET_CS2(CS_##V)
+#endif
+
+#define SET_CS3(V) _SET_CS3(CS_##V)
+#define SET_CS4(V) _SET_CS4(CS_##V)
+#define SET_CS5(V) _SET_CS5(CS_##V)
+#define SET_CS(T,V) SET_CS##T(V)
+
+// Set Compare Mode bits
+// Ex: SET_COMS(4,CLEAR_SET,CLEAR_SET,CLEAR_SET);
+#define _SET_COM(T,Q,V) (TCCR##T##Q = (TCCR##T##Q & ~(0x3 << COM##T##Q##0)) | (int(V) << COM##T##Q##0))
+#define SET_COM(T,Q,V) _SET_COM(T,Q,COM_##V)
+#define SET_COMA(T,V) SET_COM(T,A,V)
+#define SET_COMB(T,V) SET_COM(T,B,V)
+#define SET_COMC(T,V) SET_COM(T,C,V)
+#define SET_COMS(T,V1,V2,V3) do{ SET_COMA(T,V1); SET_COMB(T,V2); SET_COMC(T,V3); }while(0)
+
+// Set Noise Canceler bit
+// Ex: SET_ICNC(2,1)
+#define SET_ICNC(T,V) (TCCR##T##B = (V) ? TCCR##T##B | _BV(ICNC##T) : TCCR##T##B & ~_BV(ICNC##T))
+
+// Set Input Capture Edge Select bit
+// Ex: SET_ICES(5,0)
+#define SET_ICES(T,V) (TCCR##T##B = (V) ? TCCR##T##B | _BV(ICES##T) : TCCR##T##B & ~_BV(ICES##T))
+
+// Set Force Output Compare bit
+// Ex: SET_FOC(3,A,1)
+#define SET_FOC(T,Q,V) (TCCR##T##C = (V) ? TCCR##T##C | _BV(FOC##T##Q) : TCCR##T##C & ~_BV(FOC##T##Q))
+#define SET_FOCA(T,V) SET_FOC(T,A,V)
+#define SET_FOCB(T,V) SET_FOC(T,B,V)
+#define SET_FOCC(T,V) SET_FOC(T,C,V)
+
+// define which hardware PWMs are available for the current CPU
+// all timer 1 PWMS deleted from this list because they are never available
+#if AVR_ATmega2560_FAMILY
+  #define PWM_PIN(P)  ((P >= 2 && P <= 10) || P == 13 || P == 44 || P == 45 || P == 46)
+#elif AVR_ATmega2561_FAMILY
+  #define PWM_PIN(P)  ((P >= 2 && P <= 6) || P == 9)
+#elif AVR_ATmega1284_FAMILY
+  #define PWM_PIN(P)  (P == 3 || P == 4 || P == 14 || P == 15)
+#elif AVR_AT90USB1286_FAMILY
+  #define PWM_PIN(P)  (P == 0 || P == 1 || P == 14 || P == 15 || P == 16 || P == 24)
+#elif AVR_ATmega328_FAMILY
+  #define PWM_PIN(P)  (P == 3 || P == 5 || P == 6 || P == 11)
+#else
+  #error "unknown CPU"
+#endif

Marlin/src/HAL/AVR/fastio/fastio_1280.h

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 #pragma once
@@ -26,44 +26,42 @@
  *
  *   Hardware Pin  : 02 03 06 07 01 05 15 16 17 18 23 24 25 26 64 63 13 12 46 45 44 43 78 77 76 75 74 73 72 71 60 59 58 57 56 55 54 53 50 70 52 51 42 41 40 39 38 37 36 35 22 21 20 19 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 | 04 08 09 10 11 14 27 28 29 30 31 32 33 34 47 48 49 61 62 65 66 67 68 69 79 80 81 98 99 100
  *   Port          : E0 E1 E4 E5 G5 E3 H3 H4 H5 H6 B4 B5 B6 B7 J1 J0 H1 H0 D3 D2 D1 D0 A0 A1 A2 A3 A4 A5 A6 A7 C7 C6 C5 C4 C3 C2 C1 C0 D7 G2 G1 G0 L7 L6 L5 L4 L3 L2 L1 L0 B3 B2 B1 B0 F0 F1 F2 F3 F4 F5 F6 F7 K0 K1 K2 K3 K4 K5 K6 K7 | E2 E6 E7 xx xx H2 H7 G3 G4 xx xx xx xx xx D4 D5 D6 xx xx J2 J3 J4 J5 J6 J7 xx xx xx xx xx
- *   Logical Pin   : 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | 78 79 80 xx xx 84 85 71 70 xx xx xx xx xx 81 82 83 xx xx 72 72 75 76 77 74 xx xx xx xx xx
+ *   Logical Pin   : 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | 78 79 80 xx xx 84 85 71 70 xx xx xx xx xx 81 82 83 xx xx 72 73 75 76 77 74 xx xx xx xx xx
+ *   Analog Input  :                                                                                                                                                                    0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
  */
 
 #include "../fastio.h"
 
-// change for your board
-#define DEBUG_LED   DIO21
-
 // UART
-#define RXD         DIO0
-#define TXD         DIO1
+#define RXD         0
+#define TXD         1
 
 // SPI
-#define SCK         DIO52
-#define MISO        DIO50
-#define MOSI        DIO51
-#define SS          DIO53
+#define MISO        50
+#define MOSI        51
+#define SCK         52
+#define SS          53
 
 // TWI (I2C)
-#define SCL         DIO21
-#define SDA         DIO20
+#define SCL         21
+#define SDA         20
 
 // Timers and PWM
-#define OC0A        DIO13
-#define OC0B        DIO4
-#define OC1A        DIO11
-#define OC1B        DIO12
-#define OC2A        DIO10
-#define OC2B        DIO9
-#define OC3A        DIO5
-#define OC3B        DIO2
-#define OC3C        DIO3
-#define OC4A        DIO6
-#define OC4B        DIO7
-#define OC4C        DIO8
-#define OC5A        DIO46
-#define OC5B        DIO45
-#define OC5C        DIO44
+#define OC0A        13
+#define OC0B        4
+#define OC1A        11
+#define OC1B        12
+#define OC2A        10
+#define OC2B        9
+#define OC3A        5
+#define OC3B        2
+#define OC3C        3
+#define OC4A        6
+#define OC4B        7
+#define OC4C        8
+#define OC5A        46
+#define OC5B        45
+#define OC5C        44
 
 // Digital I/O
 

Marlin/src/HAL/AVR/fastio/fastio_1281.h

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 #pragma once
@@ -30,32 +30,29 @@
 
 #include "../fastio.h"
 
-// change for your board
-#define DEBUG_LED   DIO46
-
 // UART
-#define RXD         DIO0
-#define TXD         DIO1
+#define RXD         0
+#define TXD         1
 
 // SPI
-#define SCK         DIO10
-#define MISO        DIO12
-#define MOSI        DIO11
-#define SS          DIO16
+#define SCK         10
+#define MISO        12
+#define MOSI        11
+#define SS          16
 
 // TWI (I2C)
-#define SCL         DIO17
-#define SDA         DIO18
+#define SCL         17
+#define SDA         18
 
 // Timers and PWM
-#define OC0A        DIO9
-#define OC0B        DIO4
-#define OC1A        DIO7
-#define OC1B        DIO8
-#define OC2A        DIO6
-#define OC3A        DIO5
-#define OC3B        DIO2
-#define OC3C        DIO3
+#define OC0A        9
+#define OC0B        4
+#define OC1A        7
+#define OC1B        8
+#define OC2A        6
+#define OC3A        5
+#define OC3B        2
+#define OC3C        3
 
 // Digital I/O
 

Marlin/src/HAL/AVR/fastio/fastio_168.h

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 #pragma once
@@ -30,29 +30,27 @@
 
 #include "../fastio.h"
 
-#define DEBUG_LED   AIO5
-
 // UART
-#define RXD         DIO0
-#define TXD         DIO1
+#define RXD         0
+#define TXD         1
 
 // SPI
-#define SCK         DIO13
-#define MISO        DIO12
-#define MOSI        DIO11
-#define SS          DIO10
+#define SS          10
+#define MOSI        11
+#define MISO        12
+#define SCK         13
 
 // TWI (I2C)
 #define SCL         AIO5
 #define SDA         AIO4
 
 // Timers and PWM
-#define OC0A        DIO6
-#define OC0B        DIO5
-#define OC1A        DIO9
-#define OC1B        DIO10
-#define OC2A        DIO11
-#define OC2B        DIO3
+#define OC0A        6
+#define OC0B        5
+#define OC1A        9
+#define OC1B        10
+#define OC2A        11
+#define OC2B        3
 
 // Digital I/O
 

Marlin/src/HAL/AVR/fastio/fastio_644.h

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 #pragma once
@@ -56,34 +56,32 @@
 
 #include "../fastio.h"
 
-#define DEBUG_LED   DIO0
-
 // UART
-#define RXD         DIO8
-#define TXD         DIO9
-#define RXD0        DIO8
-#define TXD0        DIO9
+#define RXD         8
+#define TXD         9
+#define RXD0        8
+#define TXD0        9
 
-#define RXD1        DIO10
-#define TXD1        DIO11
+#define RXD1        10
+#define TXD1        11
 
 // SPI
-#define SCK         DIO7
-#define MISO        DIO6
-#define MOSI        DIO5
-#define SS          DIO4
+#define SS          4
+#define MOSI        5
+#define MISO        6
+#define SCK         7
 
 // TWI (I2C)
-#define SCL         DIO16
-#define SDA         DIO17
+#define SCL         16
+#define SDA         17
 
 // Timers and PWM
-#define OC0A        DIO3
-#define OC0B        DIO4
-#define OC1A        DIO13
-#define OC1B        DIO12
-#define OC2A        DIO15
-#define OC2B        DIO14
+#define OC0A        3
+#define OC0B        4
+#define OC1A        13
+#define OC1B        12
+#define OC2A        15
+#define OC2B        14
 
 // Digital I/O
 

Marlin/src/HAL/AVR/fastio/fastio_AT90USB.h

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 #pragma once
@@ -26,19 +26,16 @@
  *
  *   Logical Pin: 28 29 30 31 32 33 34 35 20 21 22 23 24 25 26 27 10 11 12 13 14 15 16 17 00 01 02 03 04 05 06 07 08 09(46*47)36 37 18 19 38 39 40 41 42 43 44 45
  *   Port:        A0 A1 A2 A3 A4 A5 A6 A7 B0 B1 B2 B3 B4 B5 B6 B7 C0 C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 D7 E0 E1 E2 E3 E4 E5 E6 E7 F0 F1 F2 F3 F4 F5 F6 F7
- *            The logical pins 46 and 47 are not supported by Teensyduino, but are supported below as E2 and E3
+ *            Logical pins 46-47 aren't supported by Teensyduino, but are supported below as E2 and E3
  */
 
 #include "../fastio.h"
 
-// change for your board
-#define DEBUG_LED   DIO31 /* led D5 red */
-
 // SPI
-#define SCK         DIO21  //  9
-#define MISO        DIO23  // 11
-#define MOSI        DIO22  // 10
-#define SS          DIO20  //  8
+#define SS          20  //  8
+#define SCK         21  //  9
+#define MOSI        22  // 10
+#define MISO        23  // 11
 
 // Digital I/O
 
@@ -366,8 +363,11 @@
 #define AIO7_PWM    0
 #define AIO7_DDR    DDRF
 
-//-- Begin not supported by Teensyduino
-//-- don't use Arduino functions on these pins pinMode/digitalWrite/etc
+//-- 46-47 are not supported by Teensyduino
+//-- Don't use Arduino functions (pinMode, digitalWrite, etc.) on these pins
+#define PIN_E2   46
+#define PIN_E3   47
+
 #define DIO46_PIN   PINE2
 #define DIO46_RPORT PINE
 #define DIO46_WPORT PORTE
@@ -380,10 +380,7 @@
 #define DIO47_PWM   0
 #define DIO47_DDR   DDRE
 
-#define TEENSY_E2   46
-#define TEENSY_E3   47
-
-//-- end not supported by Teensyduino
+//--
 
 #undef PA0
 #define PA0_PIN     PINA0
@@ -679,7 +676,6 @@
 #define PF7_PWM     0
 #define PF7_DDR     DDRF
 
-
 /**
  * Some of the pin mapping functions of the Teensduino extension to the Arduino IDE
  * do not function the same as the other Arduino extensions.

Marlin/src/HAL/AVR/inc/Conditionals_LCD.h

@@ -0,0 +1,26 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#ifndef SERIAL_PORT
+  #define SERIAL_PORT 0
+#endif

Marlin/src/HAL/AVR/inc/Conditionals_adv.h

@@ -0,0 +1,22 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once

Marlin/src/HAL/AVR/inc/Conditionals_post.h

@@ -0,0 +1,22 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once

Marlin/src/HAL/AVR/inc/Conditionals_type.h

@@ -0,0 +1,22 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2024 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once

Marlin/src/HAL/AVR/inc/SanityCheck.h

@@ -0,0 +1,115 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * Test AVR-specific configuration values for errors at compile-time.
+ */
+
+#if HAS_SPI_TFT || HAS_FSMC_TFT
+  #error "Sorry! TFT displays are not available for HAL/AVR."
+#endif
+
+/**
+ * Check for common serial pin conflicts
+ */
+#define CHECK_SERIAL_PIN(N) ( \
+     X_STOP_PIN == N || Y_STOP_PIN == N || Z_STOP_PIN  == N \
+  || X_MIN_PIN  == N || Y_MIN_PIN  == N || Z_MIN_PIN   == N \
+  || X_MAX_PIN  == N || Y_MAX_PIN  == N || Z_MAX_PIN   == N \
+  || X_STEP_PIN == N || Y_STEP_PIN == N || Z_STEP_PIN  == N \
+  || X_DIR_PIN  == N || Y_DIR_PIN  == N || Z_DIR_PIN   == N \
+  || X_ENA_PIN  == N || Y_ENA_PIN  == N || Z_ENA_PIN   == N \
+  || BTN_EN1    == N || BTN_EN2    == N || LCD_PINS_EN == N \
+)
+#if SERIAL_IN_USE(0)
+  // D0-D1. No known conflicts.
+#endif
+#if SERIAL_IN_USE(1)
+  #if NOT_TARGET(__AVR_ATmega644P__, __AVR_ATmega1284P__)
+    #if CHECK_SERIAL_PIN(18) || CHECK_SERIAL_PIN(19)
+      #error "Serial Port 1 pin D18 and/or D19 conflicts with another pin on the board."
+    #endif
+  #else
+    #if CHECK_SERIAL_PIN(10) || CHECK_SERIAL_PIN(11)
+      #error "Serial Port 1 pin D10 and/or D11 conflicts with another pin on the board."
+    #endif
+  #endif
+#endif
+#if SERIAL_IN_USE(2) && (CHECK_SERIAL_PIN(16) || CHECK_SERIAL_PIN(17))
+  #error "Serial Port 2 pin D16 and/or D17 conflicts with another pin on the board."
+#endif
+#if SERIAL_IN_USE(3) && (CHECK_SERIAL_PIN(14) || CHECK_SERIAL_PIN(15))
+  #error "Serial Port 3 pin D14 and/or D15 conflicts with another pin on the board."
+#endif
+#undef CHECK_SERIAL_PIN
+
+/**
+ * Checks for FAST PWM
+ */
+#if ALL(FAST_PWM_FAN, USE_OCR2A_AS_TOP, HAS_TCCR2)
+  #error "USE_OCR2A_AS_TOP does not apply to devices with a single output TIMER2."
+#endif
+
+/**
+ * Checks for SOFT PWM
+ */
+#if HAS_FAN0 && FAN0_PIN == 9 && DISABLED(FAN_SOFT_PWM) && ENABLED(SPEAKER)
+  #error "FAN0_PIN 9 Hardware PWM uses Timer 2 which conflicts with Arduino AVR Tone Timer (for SPEAKER)."
+  #error "Disable SPEAKER or enable FAN_SOFT_PWM."
+#endif
+
+/**
+ * Sanity checks for Spindle / Laser PWM
+ */
+#if ENABLED(SPINDLE_LASER_USE_PWM)
+  #include "../ServoTimers.h"   // Needed to check timer availability (_useTimer3)
+  #if SPINDLE_LASER_PWM_PIN == 4 || WITHIN(SPINDLE_LASER_PWM_PIN, 11, 13)
+    #error "Counter/Timer for SPINDLE_LASER_PWM_PIN is used by a system interrupt."
+  #elif NUM_SERVOS > 0 && defined(_useTimer3) && (WITHIN(SPINDLE_LASER_PWM_PIN, 2, 3) || SPINDLE_LASER_PWM_PIN == 5)
+    #error "Counter/Timer for SPINDLE_LASER_PWM_PIN is used by the servo system."
+  #endif
+#elif SPINDLE_LASER_FREQUENCY
+  #error "SPINDLE_LASER_FREQUENCY requires SPINDLE_LASER_USE_PWM."
+#endif
+
+/**
+ * The Trinamic library includes SoftwareSerial.h, leading to a compile error.
+ */
+#if ALL(HAS_TMC_SW_SERIAL, ENDSTOP_INTERRUPTS_FEATURE)
+  #error "TMCStepper includes SoftwareSerial.h which is incompatible with ENDSTOP_INTERRUPTS_FEATURE. Disable ENDSTOP_INTERRUPTS_FEATURE to continue."
+#endif
+
+#if ALL(HAS_TMC_SW_SERIAL, MONITOR_DRIVER_STATUS)
+  #error "MONITOR_DRIVER_STATUS causes performance issues when used with SoftwareSerial-connected drivers. Disable MONITOR_DRIVER_STATUS or use hardware serial to continue."
+#endif
+
+/**
+ * Postmortem debugging
+ */
+#if ENABLED(POSTMORTEM_DEBUGGING)
+  #error "POSTMORTEM_DEBUGGING is not supported on AVR boards."
+#endif
+
+#if USING_PULLDOWNS
+  #error "PULLDOWN pin mode is not available on AVR boards."
+#endif

Marlin/src/HAL/AVR/math.h

@@ -0,0 +1,109 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * Optimized math functions for AVR
+ */
+
+// intRes = longIn1 * longIn2 >> 24
+// uses:
+// r1, r0 for the result of mul.
+// [tmp1] to store 0.
+// [tmp2] to store bits 16-23 of the 56 bit result. The top bit of [tmp2] is used for rounding.
+// Note that the lower two bytes and the upper two bytes of the 56 bit result are not calculated.
+// This can cause the result to be out by one as the lower bytes may cause carries into the upper ones.
+// [intRes] (A B) is bits 24-39 and is the returned value.
+// [longIn1] (C B A) is a 24 bit parameter.
+// [longIn2] (D C B A) is a 32 bit parameter.
+//
+FORCE_INLINE static uint16_t MultiU24X32toH16(uint32_t longIn1, uint32_t longIn2) {
+  uint8_t tmp1;
+  uint8_t tmp2;
+  uint16_t intRes;
+  __asm__ __volatile__(
+    A("clr %[tmp1]")
+    A("mul %A[longIn1], %B[longIn2]")
+    A("mov %[tmp2], r1")
+    A("mul %B[longIn1], %C[longIn2]")
+    A("movw %A[intRes], r0")
+    A("mul %C[longIn1], %C[longIn2]")
+    A("add %B[intRes], r0")
+    A("mul %C[longIn1], %B[longIn2]")
+    A("add %A[intRes], r0")
+    A("adc %B[intRes], r1")
+    A("mul %A[longIn1], %C[longIn2]")
+    A("add %[tmp2], r0")
+    A("adc %A[intRes], r1")
+    A("adc %B[intRes], %[tmp1]")
+    A("mul %B[longIn1], %B[longIn2]")
+    A("add %[tmp2], r0")
+    A("adc %A[intRes], r1")
+    A("adc %B[intRes], %[tmp1]")
+    A("mul %C[longIn1], %A[longIn2]")
+    A("add %[tmp2], r0")
+    A("adc %A[intRes], r1")
+    A("adc %B[intRes], %[tmp1]")
+    A("mul %B[longIn1], %A[longIn2]")
+    A("add %[tmp2], r1")
+    A("adc %A[intRes], %[tmp1]")
+    A("adc %B[intRes], %[tmp1]")
+    A("mul %D[longIn2], %A[longIn1]")
+    A("lsl %[tmp2]")
+    A("adc %A[intRes], r0")
+    A("adc %B[intRes], r1")
+    A("mul %D[longIn2], %B[longIn1]")
+    A("add %B[intRes], r0")
+    A("clr r1")
+      : [intRes] "=&r" (intRes),
+        [tmp1] "=&r" (tmp1),
+        [tmp2] "=&r" (tmp2)
+      : [longIn1] "d" (longIn1),
+        [longIn2] "d" (longIn2)
+      : "cc"
+  );
+  return intRes;
+}
+
+// charRes = charIn1 * charIn2 >> 8
+// uses:
+// r1, r0 for the result of mul. After the mul, r0 holds bits 0-7 of the 16 bit result,
+//        and the top bit of r0 is used for rounding.
+// [charRes] is bits 8-15 and is the returned value.
+// [charIn1] is an 8 bit parameter.
+// [charIn2] is an 8 bit parameter.
+//
+FORCE_INLINE static uint8_t MultiU8X8toH8(uint8_t charIn1, uint8_t charIn2) {
+  uint8_t charRes;
+  __asm__ __volatile__ (
+    A("mul %[charIn1], %[charIn2]")
+    A("mov %[charRes], r1")
+    A("clr r1")
+    A("lsl r0")
+    A("adc %[charRes], r1")
+      : [charRes] "=&r" (charRes)
+      : [charIn1] "d" (charIn1),
+        [charIn2] "d" (charIn2)
+      : "cc"
+  );
+  return charRes;
+}

Marlin/src/HAL/AVR/pinsDebug.h

@@ -0,0 +1,408 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * Pins Debugging for Atmel 8 bit AVR CPUs
+ *
+ *   - NUMBER_PINS_TOTAL
+ *   - MULTI_NAME_PAD
+ *   - getPinByIndex(index)
+ *   - printPinNameByIndex(index)
+ *   - getPinIsDigitalByIndex(index)
+ *   - digitalPinToAnalogIndex(pin)
+ *   - getValidPinMode(pin)
+ *   - isValidPin(pin)
+ *   - isAnalogPin(pin)
+ *   - digitalRead_mod(pin)
+ *   - pwm_status(pin)
+ *   - printPinPWM(pin)
+ *   - printPinPort(pin)
+ *   - printPinNumber(pin)
+ *   - printPinAnalog(pin)
+ */
+
+#include "../../inc/MarlinConfig.h"
+
+#define NUMBER_PINS_TOTAL NUM_DIGITAL_PINS
+
+#if MB(BQ_ZUM_MEGA_3D, MIGHTYBOARD_REVE, MINIRAMBO, SCOOVO_X9H, TRIGORILLA_14)
+  #define AVR_ATmega2560_FAMILY_PLUS_70 1
+#endif
+
+#if AVR_AT90USB1286_FAMILY
+
+  // Working with Teensyduino extension so need to re-define some things
+  #include "pinsDebug_Teensyduino.h"
+  // Can't use the "digitalPinToPort" function from the Teensyduino type IDEs
+  // portModeRegister takes a different argument
+  #define digitalPinToTimer_DEBUG(P) digitalPinToTimer(P)
+  #define digitalPinToBitMask_DEBUG(P) digitalPinToBitMask(P)
+  #define digitalPinToPort_DEBUG(P) digitalPinToPort(P)
+  #define getValidPinMode(P) (*portModeRegister(P) & digitalPinToBitMask_DEBUG(P))
+
+#elif AVR_ATmega2560_FAMILY_PLUS_70   // So we can access/display all the pins on boards using more than 70
+
+  #include "pinsDebug_plus_70.h"
+  #define digitalPinToTimer_DEBUG(P) digitalPinToTimer_plus_70(P)
+  #define digitalPinToBitMask_DEBUG(P) digitalPinToBitMask_plus_70(P)
+  #define digitalPinToPort_DEBUG(P) digitalPinToPort_plus_70(P)
+  bool getValidPinMode(pin_t pin) {return *portModeRegister(digitalPinToPort_DEBUG(pin)) & digitalPinToBitMask_DEBUG(pin); }
+
+#else
+
+  #define digitalPinToTimer_DEBUG(P) digitalPinToTimer(P)
+  #define digitalPinToBitMask_DEBUG(P) digitalPinToBitMask(P)
+  #define digitalPinToPort_DEBUG(P) digitalPinToPort(P)
+  bool getValidPinMode(pin_t pin) {return *portModeRegister(digitalPinToPort_DEBUG(pin)) & digitalPinToBitMask_DEBUG(pin); }
+  #define getPinByIndex(x) pgm_read_byte(&pin_array[x].pin)
+
+#endif
+
+#define isValidPin(P) (P >= 0 && P < NUMBER_PINS_TOTAL)
+#if AVR_ATmega1284_FAMILY
+  #define isAnalogPin(P) WITHIN(P, analogInputToDigitalPin(7), analogInputToDigitalPin(0))
+  #define digitalPinToAnalogIndex(P) int(isAnalogPin(P) ? (P) - analogInputToDigitalPin(7) : -1)
+#else
+  #define _ANALOG1(P) WITHIN(P, analogInputToDigitalPin(0), analogInputToDigitalPin(7))
+  #define _ANALOG2(P) WITHIN(P, analogInputToDigitalPin(8), analogInputToDigitalPin(15))
+  #define isAnalogPin(P) (_ANALOG1(P) || _ANALOG2(P))
+  #define digitalPinToAnalogIndex(P) int(_ANALOG1(P) ? (P) - analogInputToDigitalPin(0) : _ANALOG2(P) ? (P) - analogInputToDigitalPin(8) + 8 : -1)
+#endif
+#define getPinByIndex(x) pgm_read_byte(&pin_array[x].pin)
+#define MULTI_NAME_PAD 26 // space needed to be pretty if not first name assigned to a pin
+
+void printPinNameByIndex(const uint8_t index) {
+  PGM_P const name_mem_pointer = (PGM_P)pgm_read_ptr(&pin_array[index].name);
+  for (uint8_t y = 0; y < MAX_NAME_LENGTH; ++y) {
+    char temp_char = pgm_read_byte(name_mem_pointer + y);
+    if (temp_char != 0)
+      SERIAL_CHAR(temp_char);
+    else {
+      for (uint8_t i = 0; i < MAX_NAME_LENGTH - y; ++i) SERIAL_CHAR(' ');
+      break;
+    }
+  }
+}
+
+#define getPinIsDigitalByIndex(x)   pgm_read_byte(&pin_array[x].is_digital)
+
+#if defined(__AVR_ATmega1284P__)  // 1284 IDE extensions set this to the number of
+  #undef NUM_DIGITAL_PINS         // digital only pins while all other CPUs have it
+  #define NUM_DIGITAL_PINS 32     // set to digital only + digital/analog
+#endif
+
+#define PWM_PRINT(V) do{ sprintf_P(buffer, PSTR("PWM:  %4d"), V); SERIAL_ECHO(buffer); }while(0)
+#define PWM_CASE(N,Z)                                           \
+  case TIMER##N##Z:                                             \
+    if (TCCR##N##A & (_BV(COM##N##Z##1) | _BV(COM##N##Z##0))) { \
+      PWM_PRINT(OCR##N##Z);                                     \
+      return true;                                              \
+    } else return false
+
+#define ABTEST(N) defined(TCCR##N##A) && defined(COM##N##A1)
+
+/**
+ * Print a pin's PWM status.
+ * Return true if it's currently a PWM pin.
+ */
+bool pwm_status(const uint8_t pin) {
+  char buffer[20];   // for the sprintf statements
+
+  switch (digitalPinToTimer_DEBUG(pin)) {
+
+    #if ABTEST(0)
+      #ifdef TIMER0A
+        #if !AVR_AT90USB1286_FAMILY  // not available in Teensyduino type IDEs
+          PWM_CASE(0, A);
+        #endif
+      #endif
+      PWM_CASE(0, B);
+    #endif
+
+    #if ABTEST(1)
+      PWM_CASE(1, A);
+      PWM_CASE(1, B);
+      #if defined(COM1C1) && defined(TIMER1C)
+        PWM_CASE(1, C);
+      #endif
+    #endif
+
+    #if ABTEST(2)
+      PWM_CASE(2, A);
+      PWM_CASE(2, B);
+    #endif
+
+    #if ABTEST(3)
+      PWM_CASE(3, A);
+      PWM_CASE(3, B);
+      #ifdef COM3C1
+        PWM_CASE(3, C);
+      #endif
+    #endif
+
+    #ifdef TCCR4A
+      PWM_CASE(4, A);
+      PWM_CASE(4, B);
+      PWM_CASE(4, C);
+    #endif
+
+    #if ABTEST(5)
+      PWM_CASE(5, A);
+      PWM_CASE(5, B);
+      PWM_CASE(5, C);
+    #endif
+
+    case NOT_ON_TIMER:
+    default:
+      return false;
+  }
+  SERIAL_ECHO_SP(2);
+} // pwm_status
+
+const volatile uint8_t* const PWM_other[][3] PROGMEM = {
+    { &TCCR0A, &TCCR0B, &TIMSK0 },
+    { &TCCR1A, &TCCR1B, &TIMSK1 },
+  #if ABTEST(2)
+    { &TCCR2A, &TCCR2B, &TIMSK2 },
+  #endif
+  #if ABTEST(3)
+    { &TCCR3A, &TCCR3B, &TIMSK3 },
+  #endif
+  #ifdef TCCR4A
+    { &TCCR4A, &TCCR4B, &TIMSK4 },
+  #endif
+  #if ABTEST(5)
+    { &TCCR5A, &TCCR5B, &TIMSK5 },
+  #endif
+};
+
+const volatile uint8_t* const PWM_OCR[][3] PROGMEM = {
+
+  #ifdef TIMER0A
+    { &OCR0A, &OCR0B, 0 },
+  #else
+    { 0, &OCR0B, 0 },
+  #endif
+
+  #if defined(COM1C1) && defined(TIMER1C)
+   { (const uint8_t*)&OCR1A, (const uint8_t*)&OCR1B, (const uint8_t*)&OCR1C },
+  #else
+   { (const uint8_t*)&OCR1A, (const uint8_t*)&OCR1B, 0 },
+  #endif
+
+  #if ABTEST(2)
+    { &OCR2A, &OCR2B, 0 },
+  #endif
+
+  #if ABTEST(3)
+    #ifdef COM3C1
+      { (const uint8_t*)&OCR3A, (const uint8_t*)&OCR3B, (const uint8_t*)&OCR3C },
+    #else
+      { (const uint8_t*)&OCR3A, (const uint8_t*)&OCR3B, 0 },
+    #endif
+  #endif
+
+  #ifdef TCCR4A
+    { (const uint8_t*)&OCR4A, (const uint8_t*)&OCR4B, (const uint8_t*)&OCR4C },
+  #endif
+
+  #if ABTEST(5)
+    { (const uint8_t*)&OCR5A, (const uint8_t*)&OCR5B, (const uint8_t*)&OCR5C },
+  #endif
+};
+
+#define TCCR_A(T)   pgm_read_word(&PWM_other[T][0])
+#define TCCR_B(T)   pgm_read_word(&PWM_other[T][1])
+#define TIMSK(T)    pgm_read_word(&PWM_other[T][2])
+#define CS_0       0
+#define CS_1       1
+#define CS_2       2
+#define WGM_0      0
+#define WGM_1      1
+#define WGM_2      3
+#define WGM_3      4
+#define TOIE       0
+
+#define OCR_VAL(T, L)   pgm_read_word(&PWM_OCR[T][L])
+
+void err_is_counter()     { SERIAL_ECHOPGM("   non-standard PWM mode"); }
+void err_is_interrupt()   { SERIAL_ECHOPGM("   compare interrupt enabled"); }
+void err_prob_interrupt() { SERIAL_ECHOPGM("   overflow interrupt enabled"); }
+void print_is_also_tied() { SERIAL_ECHOPGM(" is also tied to this pin"); SERIAL_ECHO_SP(14); }
+
+void com_print(const uint8_t N, const uint8_t Z) {
+  const uint8_t *TCCRA = (uint8_t*)TCCR_A(N);
+  SERIAL_ECHOPGM("    COM", AS_DIGIT(N));
+  SERIAL_CHAR(Z);
+  SERIAL_ECHOPGM(": ", int((*TCCRA >> (6 - Z * 2)) & 0x03));
+}
+
+void timer_prefix(uint8_t T, char L, uint8_t N) {  // T - timer    L - pwm  N - WGM bit layout
+  char buffer[20];   // for the sprintf statements
+  const uint8_t *TCCRB = (uint8_t*)TCCR_B(T),
+                *TCCRA = (uint8_t*)TCCR_A(T);
+  uint8_t WGM = (((*TCCRB & _BV(WGM_2)) >> 1) | (*TCCRA & (_BV(WGM_0) | _BV(WGM_1))));
+  if (N == 4) WGM |= ((*TCCRB & _BV(WGM_3)) >> 1);
+
+  SERIAL_ECHOPGM("    TIMER", AS_DIGIT(T));
+  SERIAL_CHAR(L);
+  SERIAL_ECHO_SP(3);
+
+  if (N == 3) {
+    const uint8_t *OCRVAL8 = (uint8_t*)OCR_VAL(T, L - 'A');
+    PWM_PRINT(*OCRVAL8);
+  }
+  else {
+    const uint16_t *OCRVAL16 = (uint16_t*)OCR_VAL(T, L - 'A');
+    PWM_PRINT(*OCRVAL16);
+  }
+  SERIAL_ECHOPGM("    WGM: ", WGM);
+  com_print(T,L);
+  SERIAL_ECHOPGM("    CS: ", (*TCCRB & (_BV(CS_0) | _BV(CS_1) | _BV(CS_2)) ));
+  SERIAL_ECHOPGM("    TCCR", AS_DIGIT(T), "A: ", *TCCRA);
+  SERIAL_ECHOPGM("    TCCR", AS_DIGIT(T), "B: ", *TCCRB);
+
+  const uint8_t *TMSK = (uint8_t*)TIMSK(T);
+  SERIAL_ECHOPGM("    TIMSK", AS_DIGIT(T), ": ", *TMSK);
+
+  const uint8_t OCIE = L - 'A' + 1;
+  if (N == 3) { if (WGM == 0 || WGM == 2 || WGM ==  4 || WGM ==  6) err_is_counter(); }
+  else        { if (WGM == 0 || WGM == 4 || WGM == 12 || WGM == 13) err_is_counter(); }
+  if (TEST(*TMSK, OCIE)) err_is_interrupt();
+  if (TEST(*TMSK, TOIE)) err_prob_interrupt();
+}
+
+void printPinPWM(const uint8_t pin) {
+  switch (digitalPinToTimer_DEBUG(pin)) {
+
+    #if ABTEST(0)
+      #ifdef TIMER0A
+        #if !AVR_AT90USB1286_FAMILY  // not available in Teensyduino type IDEs
+          case TIMER0A: timer_prefix(0, 'A', 3); break;
+        #endif
+      #endif
+      case TIMER0B: timer_prefix(0, 'B', 3); break;
+    #endif
+
+    #if ABTEST(1)
+      case TIMER1A: timer_prefix(1, 'A', 4); break;
+      case TIMER1B: timer_prefix(1, 'B', 4); break;
+      #if defined(COM1C1) && defined(TIMER1C)
+        case TIMER1C: timer_prefix(1, 'C', 4); break;
+      #endif
+    #endif
+
+    #if ABTEST(2)
+      case TIMER2A: timer_prefix(2, 'A', 3); break;
+      case TIMER2B: timer_prefix(2, 'B', 3); break;
+    #endif
+
+    #if ABTEST(3)
+      case TIMER3A: timer_prefix(3, 'A', 4); break;
+      case TIMER3B: timer_prefix(3, 'B', 4); break;
+      #ifdef COM3C1
+        case TIMER3C: timer_prefix(3, 'C', 4); break;
+      #endif
+    #endif
+
+    #ifdef TCCR4A
+      case TIMER4A: timer_prefix(4, 'A', 4); break;
+      case TIMER4B: timer_prefix(4, 'B', 4); break;
+      case TIMER4C: timer_prefix(4, 'C', 4); break;
+    #endif
+
+    #if ABTEST(5)
+      case TIMER5A: timer_prefix(5, 'A', 4); break;
+      case TIMER5B: timer_prefix(5, 'B', 4); break;
+      case TIMER5C: timer_prefix(5, 'C', 4); break;
+    #endif
+
+    case NOT_ON_TIMER: break;
+
+  }
+  SERIAL_ECHOPGM("  ");
+
+  // on pins that have two PWMs, print info on second PWM
+  #if AVR_ATmega2560_FAMILY || AVR_AT90USB1286_FAMILY
+    // looking for port B7 - PWMs 0A and 1C
+    if (digitalPinToPort_DEBUG(pin) == 'B' - 64 && 0x80 == digitalPinToBitMask_DEBUG(pin)) {
+      #if !AVR_AT90USB1286_FAMILY
+        SERIAL_ECHOPGM("\n .");
+        SERIAL_ECHO_SP(18);
+        SERIAL_ECHOPGM("TIMER1C");
+        print_is_also_tied();
+        timer_prefix(1, 'C', 4);
+      #else
+        SERIAL_ECHOPGM("\n .");
+        SERIAL_ECHO_SP(18);
+        SERIAL_ECHOPGM("TIMER0A");
+        print_is_also_tied();
+        timer_prefix(0, 'A', 3);
+      #endif
+    }
+  #else
+    UNUSED(print_is_also_tied);
+  #endif
+} // printPinPWM
+
+#ifndef digitalRead_mod                   // Use Teensyduino's version of digitalRead - it doesn't disable the PWMs
+  int digitalRead_mod(const pin_t pin) {  // same as digitalRead except the PWM stop section has been removed
+    const uint8_t port = digitalPinToPort_DEBUG(pin);
+    return (port != NOT_A_PIN) && (*portInputRegister(port) & digitalPinToBitMask_DEBUG(pin)) ? HIGH : LOW;
+  }
+#endif
+
+void printPinPort(const pin_t pin) {   // print port number
+  #ifdef digitalPinToPort_DEBUG
+    uint8_t x;
+    SERIAL_ECHOPGM("  Port: ");
+    #if AVR_AT90USB1286_FAMILY
+      x = (pin == PIN_E2 || pin == PIN_E3) ? 'E' : 'A' + digitalPinToPort_DEBUG(pin) - 1;
+    #else
+      x = 'A' + digitalPinToPort_DEBUG(pin) - 1;
+    #endif
+    SERIAL_CHAR(x);
+
+    #if AVR_AT90USB1286_FAMILY
+      if (pin == PIN_E2)
+        x = '2';
+      else if (pin == PIN_E3)
+        x = '3';
+      else {
+        uint8_t temp = digitalPinToBitMask_DEBUG(pin);
+        for (x = '0'; x < '9' && temp != 1; x++) temp >>= 1;
+      }
+    #else
+      uint8_t temp = digitalPinToBitMask_DEBUG(pin);
+      for (x = '0'; x < '9' && temp != 1; x++) temp >>= 1;
+    #endif
+    SERIAL_CHAR(x);
+  #else
+    SERIAL_ECHO_SP(10);
+  #endif
+}
+
+#define printPinNumber(P) do{ sprintf_P(buffer, PSTR("%3d "), P); SERIAL_ECHO(buffer); }while(0)
+#define printPinAnalog(P) do{ sprintf_P(buffer, PSTR(" (A%2d)  "), digitalPinToAnalogIndex(P)); SERIAL_ECHO(buffer); }while(0)
+
+#undef ABTEST

Marlin/src/HAL/AVR/pinsDebug_Teensyduino.h

@@ -2,6 +2,9 @@
  * Marlin 3D Printer Firmware
  * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
@@ -13,17 +16,16 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 #pragma once
 
 //
-//  some of the pin mapping functions of the Teensduino extension to the Arduino IDE
-//  do not function the same as the other Arduino extensions
+// Some of the pin mapping functions of the Arduino IDE Teensduino extension
+// function differently from other Arduino extensions.
 //
 
-
 #define TEENSYDUINO_IDE
 
 //digitalPinToTimer(pin) function works like Arduino but Timers are not defined
@@ -45,8 +47,6 @@
 #define PE 5
 #define PF 6
 
-#undef digitalPinToPort
-
 const uint8_t PROGMEM digital_pin_to_port_PGM[] = {
   PD, // 0  - PD0 - INT0 - PWM
   PD, // 1  - PD1 - INT1 - PWM
@@ -98,11 +98,11 @@ const uint8_t PROGMEM digital_pin_to_port_PGM[] = {
   PE, // 47 - PE3 (not defined in teensyduino)
 };
 
-#define digitalPinToPort(P) ( pgm_read_byte( digital_pin_to_port_PGM + (P) ) )
+#define digitalPinToPort(P) pgm_read_byte(digital_pin_to_port_PGM[P])
 
 // digitalPinToBitMask(pin) is OK
 
-#define digitalRead_mod(p)  extDigitalRead(p)   // Teensyduino's version of digitalRead doesn't
+#define digitalRead_mod(P)  extDigitalRead(P)   // Teensyduino's version of digitalRead doesn't
                                                 // disable the PWMs so we can use it as is
 
 // portModeRegister(pin) is OK

Marlin/src/HAL/AVR/pinsDebug_plus_70.h

@@ -0,0 +1,331 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * Structures for 2560 family boards that use more than 70 pins
+ */
+
+#if MB(BQ_ZUM_MEGA_3D, MINIRAMBO, SCOOVO_X9H, TRIGORILLA_14)
+  #undef NUM_DIGITAL_PINS
+  #define NUM_DIGITAL_PINS            85
+#elif MB(MIGHTYBOARD_REVE)
+  #undef NUM_DIGITAL_PINS
+  #define NUM_DIGITAL_PINS            80
+#endif
+
+#define PA 1
+#define PB 2
+#define PC 3
+#define PD 4
+#define PE 5
+#define PF 6
+#define PG 7
+#define PH 8
+#define PJ 10
+#define PK 11
+#define PL 12
+
+const uint8_t PROGMEM digital_pin_to_port_PGM_plus_70[] = {
+  // PORTLIST
+  // ------------------------
+  PE, // PE 0 ** 0 ** USART0_RX
+  PE, // PE 1 ** 1 ** USART0_TX
+  PE, // PE 4 ** 2 ** PWM2
+  PE, // PE 5 ** 3 ** PWM3
+  PG, // PG 5 ** 4 ** PWM4
+  PE, // PE 3 ** 5 ** PWM5
+  PH, // PH 3 ** 6 ** PWM6
+  PH, // PH 4 ** 7 ** PWM7
+  PH, // PH 5 ** 8 ** PWM8
+  PH, // PH 6 ** 9 ** PWM9
+  PB, // PB 4 ** 10 ** PWM10
+  PB, // PB 5 ** 11 ** PWM11
+  PB, // PB 6 ** 12 ** PWM12
+  PB, // PB 7 ** 13 ** PWM13
+  PJ, // PJ 1 ** 14 ** USART3_TX
+  PJ, // PJ 0 ** 15 ** USART3_RX
+  PH, // PH 1 ** 16 ** USART2_TX
+  PH, // PH 0 ** 17 ** USART2_RX
+  PD, // PD 3 ** 18 ** USART1_TX
+  PD, // PD 2 ** 19 ** USART1_RX
+  PD, // PD 1 ** 20 ** I2C_SDA
+  PD, // PD 0 ** 21 ** I2C_SCL
+  PA, // PA 0 ** 22 ** D22
+  PA, // PA 1 ** 23 ** D23
+  PA, // PA 2 ** 24 ** D24
+  PA, // PA 3 ** 25 ** D25
+  PA, // PA 4 ** 26 ** D26
+  PA, // PA 5 ** 27 ** D27
+  PA, // PA 6 ** 28 ** D28
+  PA, // PA 7 ** 29 ** D29
+  PC, // PC 7 ** 30 ** D30
+  PC, // PC 6 ** 31 ** D31
+  PC, // PC 5 ** 32 ** D32
+  PC, // PC 4 ** 33 ** D33
+  PC, // PC 3 ** 34 ** D34
+  PC, // PC 2 ** 35 ** D35
+  PC, // PC 1 ** 36 ** D36
+  PC, // PC 0 ** 37 ** D37
+  PD, // PD 7 ** 38 ** D38
+  PG, // PG 2 ** 39 ** D39
+  PG, // PG 1 ** 40 ** D40
+  PG, // PG 0 ** 41 ** D41
+  PL, // PL 7 ** 42 ** D42
+  PL, // PL 6 ** 43 ** D43
+  PL, // PL 5 ** 44 ** D44
+  PL, // PL 4 ** 45 ** D45
+  PL, // PL 3 ** 46 ** D46
+  PL, // PL 2 ** 47 ** D47
+  PL, // PL 1 ** 48 ** D48
+  PL, // PL 0 ** 49 ** D49
+  PB, // PB 3 ** 50 ** SPI_MISO
+  PB, // PB 2 ** 51 ** SPI_MOSI
+  PB, // PB 1 ** 52 ** SPI_SCK
+  PB, // PB 0 ** 53 ** SPI_SS
+  PF, // PF 0 ** 54 ** A0
+  PF, // PF 1 ** 55 ** A1
+  PF, // PF 2 ** 56 ** A2
+  PF, // PF 3 ** 57 ** A3
+  PF, // PF 4 ** 58 ** A4
+  PF, // PF 5 ** 59 ** A5
+  PF, // PF 6 ** 60 ** A6
+  PF, // PF 7 ** 61 ** A7
+  PK, // PK 0 ** 62 ** A8
+  PK, // PK 1 ** 63 ** A9
+  PK, // PK 2 ** 64 ** A10
+  PK, // PK 3 ** 65 ** A11
+  PK, // PK 4 ** 66 ** A12
+  PK, // PK 5 ** 67 ** A13
+  PK, // PK 6 ** 68 ** A14
+  PK, // PK 7 ** 69 ** A15
+  PG, // PG 4 ** 70 **
+  PG, // PG 3 ** 71 **
+  PJ, // PJ 2 ** 72 **
+  PJ, // PJ 3 ** 73 **
+  PJ, // PJ 7 ** 74 **
+  PJ, // PJ 4 ** 75 **
+  PJ, // PJ 5 ** 76 **
+  PJ, // PJ 6 ** 77 **
+  PE, // PE 2 ** 78 **
+  PE, // PE 6 ** 79 **
+  PE, // PE 7 ** 80 **
+  PD, // PD 4 ** 81 **
+  PD, // PD 5 ** 82 **
+  PD, // PD 6 ** 83 **
+  PH, // PH 2 ** 84 **
+  PH, // PH 7 ** 85 **
+};
+
+#define digitalPinToPort_plus_70(P) ( pgm_read_byte( digital_pin_to_port_PGM_plus_70 + (P) ) )
+
+const uint8_t PROGMEM digital_pin_to_bit_mask_PGM_plus_70[] = {
+  // PIN IN PORT
+  // ------------------------
+  _BV( 0 ), // PE 0 ** 0 ** USART0_RX
+  _BV( 1 ), // PE 1 ** 1 ** USART0_TX
+  _BV( 4 ), // PE 4 ** 2 ** PWM2
+  _BV( 5 ), // PE 5 ** 3 ** PWM3
+  _BV( 5 ), // PG 5 ** 4 ** PWM4
+  _BV( 3 ), // PE 3 ** 5 ** PWM5
+  _BV( 3 ), // PH 3 ** 6 ** PWM6
+  _BV( 4 ), // PH 4 ** 7 ** PWM7
+  _BV( 5 ), // PH 5 ** 8 ** PWM8
+  _BV( 6 ), // PH 6 ** 9 ** PWM9
+  _BV( 4 ), // PB 4 ** 10 ** PWM10
+  _BV( 5 ), // PB 5 ** 11 ** PWM11
+  _BV( 6 ), // PB 6 ** 12 ** PWM12
+  _BV( 7 ), // PB 7 ** 13 ** PWM13
+  _BV( 1 ), // PJ 1 ** 14 ** USART3_TX
+  _BV( 0 ), // PJ 0 ** 15 ** USART3_RX
+  _BV( 1 ), // PH 1 ** 16 ** USART2_TX
+  _BV( 0 ), // PH 0 ** 17 ** USART2_RX
+  _BV( 3 ), // PD 3 ** 18 ** USART1_TX
+  _BV( 2 ), // PD 2 ** 19 ** USART1_RX
+  _BV( 1 ), // PD 1 ** 20 ** I2C_SDA
+  _BV( 0 ), // PD 0 ** 21 ** I2C_SCL
+  _BV( 0 ), // PA 0 ** 22 ** D22
+  _BV( 1 ), // PA 1 ** 23 ** D23
+  _BV( 2 ), // PA 2 ** 24 ** D24
+  _BV( 3 ), // PA 3 ** 25 ** D25
+  _BV( 4 ), // PA 4 ** 26 ** D26
+  _BV( 5 ), // PA 5 ** 27 ** D27
+  _BV( 6 ), // PA 6 ** 28 ** D28
+  _BV( 7 ), // PA 7 ** 29 ** D29
+  _BV( 7 ), // PC 7 ** 30 ** D30
+  _BV( 6 ), // PC 6 ** 31 ** D31
+  _BV( 5 ), // PC 5 ** 32 ** D32
+  _BV( 4 ), // PC 4 ** 33 ** D33
+  _BV( 3 ), // PC 3 ** 34 ** D34
+  _BV( 2 ), // PC 2 ** 35 ** D35
+  _BV( 1 ), // PC 1 ** 36 ** D36
+  _BV( 0 ), // PC 0 ** 37 ** D37
+  _BV( 7 ), // PD 7 ** 38 ** D38
+  _BV( 2 ), // PG 2 ** 39 ** D39
+  _BV( 1 ), // PG 1 ** 40 ** D40
+  _BV( 0 ), // PG 0 ** 41 ** D41
+  _BV( 7 ), // PL 7 ** 42 ** D42
+  _BV( 6 ), // PL 6 ** 43 ** D43
+  _BV( 5 ), // PL 5 ** 44 ** D44
+  _BV( 4 ), // PL 4 ** 45 ** D45
+  _BV( 3 ), // PL 3 ** 46 ** D46
+  _BV( 2 ), // PL 2 ** 47 ** D47
+  _BV( 1 ), // PL 1 ** 48 ** D48
+  _BV( 0 ), // PL 0 ** 49 ** D49
+  _BV( 3 ), // PB 3 ** 50 ** SPI_MISO
+  _BV( 2 ), // PB 2 ** 51 ** SPI_MOSI
+  _BV( 1 ), // PB 1 ** 52 ** SPI_SCK
+  _BV( 0 ), // PB 0 ** 53 ** SPI_SS
+  _BV( 0 ), // PF 0 ** 54 ** A0
+  _BV( 1 ), // PF 1 ** 55 ** A1
+  _BV( 2 ), // PF 2 ** 56 ** A2
+  _BV( 3 ), // PF 3 ** 57 ** A3
+  _BV( 4 ), // PF 4 ** 58 ** A4
+  _BV( 5 ), // PF 5 ** 59 ** A5
+  _BV( 6 ), // PF 6 ** 60 ** A6
+  _BV( 7 ), // PF 7 ** 61 ** A7
+  _BV( 0 ), // PK 0 ** 62 ** A8
+  _BV( 1 ), // PK 1 ** 63 ** A9
+  _BV( 2 ), // PK 2 ** 64 ** A10
+  _BV( 3 ), // PK 3 ** 65 ** A11
+  _BV( 4 ), // PK 4 ** 66 ** A12
+  _BV( 5 ), // PK 5 ** 67 ** A13
+  _BV( 6 ), // PK 6 ** 68 ** A14
+  _BV( 7 ), // PK 7 ** 69 ** A15
+  _BV( 4 ), // PG 4 ** 70 **
+  _BV( 3 ), // PG 3 ** 71 **
+  _BV( 2 ), // PJ 2 ** 72 **
+  _BV( 3 ), // PJ 3 ** 73 **
+  _BV( 7 ), // PJ 7 ** 74 **
+  _BV( 4 ), // PJ 4 ** 75 **
+  _BV( 5 ), // PJ 5 ** 76 **
+  _BV( 6 ), // PJ 6 ** 77 **
+  _BV( 2 ), // PE 2 ** 78 **
+  _BV( 6 ), // PE 6 ** 79 **
+  _BV( 7 ), // PE 7 ** 80 **
+  _BV( 4 ), // PD 4 ** 81 **
+  _BV( 5 ), // PD 5 ** 82 **
+  _BV( 6 ), // PD 6 ** 83 **
+  _BV( 2 ), // PH 2 ** 84 **
+  _BV( 7 ), // PH 7 ** 85 **
+};
+
+#define digitalPinToBitMask_plus_70(P) ( pgm_read_byte( digital_pin_to_bit_mask_PGM_plus_70 + (P) ) )
+
+const uint8_t PROGMEM digital_pin_to_timer_PGM_plus_70[] = {
+  // TIMERS
+  // ------------------------
+  NOT_ON_TIMER, // PE 0 ** 0 ** USART0_RX
+  NOT_ON_TIMER, // PE 1 ** 1 ** USART0_TX
+  TIMER3B, // PE 4 ** 2 ** PWM2
+  TIMER3C, // PE 5 ** 3 ** PWM3
+  TIMER0B, // PG 5 ** 4 ** PWM4
+  TIMER3A, // PE 3 ** 5 ** PWM5
+  TIMER4A, // PH 3 ** 6 ** PWM6
+  TIMER4B, // PH 4 ** 7 ** PWM7
+  TIMER4C, // PH 5 ** 8 ** PWM8
+  TIMER2B, // PH 6 ** 9 ** PWM9
+  TIMER2A, // PB 4 ** 10 ** PWM10
+  TIMER1A, // PB 5 ** 11 ** PWM11
+  TIMER1B, // PB 6 ** 12 ** PWM12
+  TIMER0A, // PB 7 ** 13 ** PWM13
+  NOT_ON_TIMER, // PJ 1 ** 14 ** USART3_TX
+  NOT_ON_TIMER, // PJ 0 ** 15 ** USART3_RX
+  NOT_ON_TIMER, // PH 1 ** 16 ** USART2_TX
+  NOT_ON_TIMER, // PH 0 ** 17 ** USART2_RX
+  NOT_ON_TIMER, // PD 3 ** 18 ** USART1_TX
+  NOT_ON_TIMER, // PD 2 ** 19 ** USART1_RX
+  NOT_ON_TIMER, // PD 1 ** 20 ** I2C_SDA
+  NOT_ON_TIMER, // PD 0 ** 21 ** I2C_SCL
+  NOT_ON_TIMER, // PA 0 ** 22 ** D22
+  NOT_ON_TIMER, // PA 1 ** 23 ** D23
+  NOT_ON_TIMER, // PA 2 ** 24 ** D24
+  NOT_ON_TIMER, // PA 3 ** 25 ** D25
+  NOT_ON_TIMER, // PA 4 ** 26 ** D26
+  NOT_ON_TIMER, // PA 5 ** 27 ** D27
+  NOT_ON_TIMER, // PA 6 ** 28 ** D28
+  NOT_ON_TIMER, // PA 7 ** 29 ** D29
+  NOT_ON_TIMER, // PC 7 ** 30 ** D30
+  NOT_ON_TIMER, // PC 6 ** 31 ** D31
+  NOT_ON_TIMER, // PC 5 ** 32 ** D32
+  NOT_ON_TIMER, // PC 4 ** 33 ** D33
+  NOT_ON_TIMER, // PC 3 ** 34 ** D34
+  NOT_ON_TIMER, // PC 2 ** 35 ** D35
+  NOT_ON_TIMER, // PC 1 ** 36 ** D36
+  NOT_ON_TIMER, // PC 0 ** 37 ** D37
+  NOT_ON_TIMER, // PD 7 ** 38 ** D38
+  NOT_ON_TIMER, // PG 2 ** 39 ** D39
+  NOT_ON_TIMER, // PG 1 ** 40 ** D40
+  NOT_ON_TIMER, // PG 0 ** 41 ** D41
+  NOT_ON_TIMER, // PL 7 ** 42 ** D42
+  NOT_ON_TIMER, // PL 6 ** 43 ** D43
+  TIMER5C, // PL 5 ** 44 ** D44
+  TIMER5B, // PL 4 ** 45 ** D45
+  TIMER5A, // PL 3 ** 46 ** D46
+  NOT_ON_TIMER, // PL 2 ** 47 ** D47
+  NOT_ON_TIMER, // PL 1 ** 48 ** D48
+  NOT_ON_TIMER, // PL 0 ** 49 ** D49
+  NOT_ON_TIMER, // PB 3 ** 50 ** SPI_MISO
+  NOT_ON_TIMER, // PB 2 ** 51 ** SPI_MOSI
+  NOT_ON_TIMER, // PB 1 ** 52 ** SPI_SCK
+  NOT_ON_TIMER, // PB 0 ** 53 ** SPI_SS
+  NOT_ON_TIMER, // PF 0 ** 54 ** A0
+  NOT_ON_TIMER, // PF 1 ** 55 ** A1
+  NOT_ON_TIMER, // PF 2 ** 56 ** A2
+  NOT_ON_TIMER, // PF 3 ** 57 ** A3
+  NOT_ON_TIMER, // PF 4 ** 58 ** A4
+  NOT_ON_TIMER, // PF 5 ** 59 ** A5
+  NOT_ON_TIMER, // PF 6 ** 60 ** A6
+  NOT_ON_TIMER, // PF 7 ** 61 ** A7
+  NOT_ON_TIMER, // PK 0 ** 62 ** A8
+  NOT_ON_TIMER, // PK 1 ** 63 ** A9
+  NOT_ON_TIMER, // PK 2 ** 64 ** A10
+  NOT_ON_TIMER, // PK 3 ** 65 ** A11
+  NOT_ON_TIMER, // PK 4 ** 66 ** A12
+  NOT_ON_TIMER, // PK 5 ** 67 ** A13
+  NOT_ON_TIMER, // PK 6 ** 68 ** A14
+  NOT_ON_TIMER, // PK 7 ** 69 ** A15
+  NOT_ON_TIMER, // PG 4 ** 70 **
+  NOT_ON_TIMER, // PG 3 ** 71 **
+  NOT_ON_TIMER, // PJ 2 ** 72 **
+  NOT_ON_TIMER, // PJ 3 ** 73 **
+  NOT_ON_TIMER, // PJ 7 ** 74 **
+  NOT_ON_TIMER, // PJ 4 ** 75 **
+  NOT_ON_TIMER, // PJ 5 ** 76 **
+  NOT_ON_TIMER, // PJ 6 ** 77 **
+  NOT_ON_TIMER, // PE 2 ** 78 **
+  NOT_ON_TIMER, // PE 6 ** 79 **
+};
+
+#define digitalPinToTimer_plus_70(P) ( pgm_read_byte( digital_pin_to_timer_PGM_plus_70 + (P) ) )
+
+/**
+ *  Interrupts that are not implemented
+ *
+ *  INT6    E6 79
+ *  INT7    E7 80
+ *  PCINT11 J2 72
+ *  PCINT12 J3 73
+ *  PCINT13 J4 75
+ *  PCINT14 J5 76
+ *  PCINT15 J6 77
+ */

Marlin/src/HAL/AVR/registers.cpp

@@ -0,0 +1,979 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2023 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifdef __AVR__
+
+#include "../../inc/MarlinConfigPre.h"
+
+#if ENABLED(HAL_AVR_DIRTY_INIT)
+
+#include "registers.h"
+
+// Since the compiler could be creating multiple copies of function code-graphs for each header inline-inclusion,
+// we want to off-load the function definitions that define static memory into this solitary compilation unit.
+// This way the ROM is NOT bloated (who knows if the compiler is optimizing same-content constant objects into one?)
+
+ATmegaPinFunctions _ATmega_getPinFunctions(int pin) {
+  if (pin < 0) return {};
+
+  ATmegaPinInfo info = _ATmega_getPinInfo((unsigned int)pin);
+
+  #ifdef __AVR_TRM01__
+    if (info.port == eATmegaPort::PORT_A) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD7 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD6 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD5 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD4 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD3 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD1 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD0 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_B) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC0A, eATmegaPinFunc::TOC1C, eATmegaPinFunc::PCI7 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC1B, eATmegaPinFunc::PCI6 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC1A, eATmegaPinFunc::PCI5 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC2A, eATmegaPinFunc::PCI4 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_MISO, eATmegaPinFunc::PCI3 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_MOSI, eATmegaPinFunc::PCI2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_SCK, eATmegaPinFunc::PCI1 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_CS, eATmegaPinFunc::PCI0 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_C) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD15 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD14 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD13 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD12 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD11 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD10 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD9 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD8 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_D) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER0_CLKI };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER1_CLKI };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART1_CLK };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER1_ICP };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT3, eATmegaPinFunc::USART1_TXD };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT2, eATmegaPinFunc::USART1_RXD };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT1, eATmegaPinFunc::TWI_SDA };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT0, eATmegaPinFunc::TWI_CLK };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_E) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT7, eATmegaPinFunc::TIMER3_ICP, eATmegaPinFunc::CLKO };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT6, eATmegaPinFunc::TIMER3_CLKI };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT5, eATmegaPinFunc::TOC3C };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT4, eATmegaPinFunc::TOC3B };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::AIN1, eATmegaPinFunc::TOC3A };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::AIN0, eATmegaPinFunc::USART0_CLK };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PDO, eATmegaPinFunc::USART0_TXD };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PDI, eATmegaPinFunc::USART0_RXD, eATmegaPinFunc::PCI8 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_F) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC7 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC6 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC5 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC4 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC3 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC1 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC0 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_G) {
+      if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC0B };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOSC1 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3 ) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOSC2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_ALE };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_RD };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_WR };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_H) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER4_CLKI };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC2B };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC4C };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC4B };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC4A };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART2_CLK };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART2_TXD };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART2_RXD };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_J) {
+      if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI15 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI14 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI13 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI12 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART3_CLK, eATmegaPinFunc::PCI11 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART3_TXD, eATmegaPinFunc::PCI10 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART3_RXD, eATmegaPinFunc::PCI9 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_K) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC15, eATmegaPinFunc::PCI23 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC14, eATmegaPinFunc::PCI22 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC13, eATmegaPinFunc::PCI21 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC12, eATmegaPinFunc::PCI20 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC11, eATmegaPinFunc::PCI19 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC10, eATmegaPinFunc::PCI18 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC9, eATmegaPinFunc::PCI17 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC8, eATmegaPinFunc::PCI16 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_L) {
+      if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC5C };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC5B };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC5A };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER5_CLKI };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER5_ICP };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER4_ICP };
+        return { funcs, countof(funcs) };
+      }
+    }
+  #elif defined(__AVR_TRM02__)
+    if (info.port == eATmegaPort::PORT_A) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI7, eATmegaPinFunc::ADC7 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI6, eATmegaPinFunc::ADC6 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI5, eATmegaPinFunc::ADC5 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI4, eATmegaPinFunc::ADC4 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI3, eATmegaPinFunc::ADC3 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI2, eATmegaPinFunc::ADC2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI1, eATmegaPinFunc::ADC1 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI0, eATmegaPinFunc::ADC0 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_B) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_SCK, eATmegaPinFunc::TOC3B, eATmegaPinFunc::PCI15 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_MISO, eATmegaPinFunc::TOC3A, eATmegaPinFunc::PCI14 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_MOSI, eATmegaPinFunc::TIMER3_ICP, eATmegaPinFunc::PCI13 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_CS, eATmegaPinFunc::TOC0B, eATmegaPinFunc::PCI12 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::AIN1, eATmegaPinFunc::TOC0A, eATmegaPinFunc::PCI11 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::AIN0, eATmegaPinFunc::EINT2, eATmegaPinFunc::PCI10 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER1_ECI, eATmegaPinFunc::CLKO, eATmegaPinFunc::PCI9 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER0_ECI, eATmegaPinFunc::USART0_CLK, eATmegaPinFunc::PCI8 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_C) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOSC2, eATmegaPinFunc::PCI23 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOSC1, eATmegaPinFunc::PCI22 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI21 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI20 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI19 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI18 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI17, eATmegaPinFunc::TWI_SDA };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TWI_CLK, eATmegaPinFunc::PCI16 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_D) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC2A, eATmegaPinFunc::PCI31 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER1_ICP, eATmegaPinFunc::TOC2B, eATmegaPinFunc::PCI30 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC1A, eATmegaPinFunc::PCI29 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC1B, eATmegaPinFunc::USART1_CLK, eATmegaPinFunc::PCI28 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT1, eATmegaPinFunc::USART1_TXD, eATmegaPinFunc::PCI27 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT0, eATmegaPinFunc::USART1_RXD, eATmegaPinFunc::PCI26 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART0_TXD, eATmegaPinFunc::PCI25 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART0_TXD, eATmegaPinFunc::PCI24, eATmegaPinFunc::TIMER3_ECI };
+        return { funcs, countof(funcs) };
+      }
+    }
+  #elif defined(__AVR_TRM03__)
+    if (info.port == eATmegaPort::PORT_B) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::XTAL2, eATmegaPinFunc::TOSC2, eATmegaPinFunc::PCI7 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::XTAL1, eATmegaPinFunc::TOSC1, eATmegaPinFunc::PCI6 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_SCK, eATmegaPinFunc::PCI5 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_MISO, eATmegaPinFunc::PCI4 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_MOSI, eATmegaPinFunc::TOC2A, eATmegaPinFunc::PCI3 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_CS, eATmegaPinFunc::TOC1B, eATmegaPinFunc::PCI2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC1A, eATmegaPinFunc::PCI1 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER1_ICP, eATmegaPinFunc::CLKO, eATmegaPinFunc::PCI0 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_C) {
+      if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI14 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC5, eATmegaPinFunc::TWI_CLK, eATmegaPinFunc::PCI13 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC4, eATmegaPinFunc::TWI_SDA, eATmegaPinFunc::PCI12 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC3, eATmegaPinFunc::PCI11 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC2, eATmegaPinFunc::PCI10 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC1, eATmegaPinFunc::PCI9 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC0, eATmegaPinFunc::PCI8 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_D) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::AIN1, eATmegaPinFunc::PCI23 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::AIN0, eATmegaPinFunc::TOC0A, eATmegaPinFunc::PCI22 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER1_ECI, eATmegaPinFunc::TOC0B, eATmegaPinFunc::PCI21 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART_CLK, eATmegaPinFunc::TIMER0_ECI, eATmegaPinFunc::PCI20 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT1, eATmegaPinFunc::TOC2B, eATmegaPinFunc::PCI19 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT0, eATmegaPinFunc::PCI18 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART_TXD, eATmegaPinFunc::PCI17 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART_RXD, eATmegaPinFunc::PCI16 };
+        return { funcs, countof(funcs) };
+      }
+    }
+  #elif defined(__AVR_TRM04__)
+    if (info.port == eATmegaPort::PORT_A) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD7 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD6 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD5 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD4 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD3 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD1 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD0 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_B) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC0A, eATmegaPinFunc::TOC1C, eATmegaPinFunc::PCI7 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC1B, eATmegaPinFunc::PCI6 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC1A, eATmegaPinFunc::PCI5 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC2A, eATmegaPinFunc::PCI4 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PDO, eATmegaPinFunc::SPI_MISO, eATmegaPinFunc::PCI3 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PDI, eATmegaPinFunc::SPI_MOSI, eATmegaPinFunc::PCI2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_SCK, eATmegaPinFunc::PCI1 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_CS, eATmegaPinFunc::PCI0 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_C) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD15, eATmegaPinFunc::TIMER3_ICP, eATmegaPinFunc::CLKO };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD14, eATmegaPinFunc::TOC3A };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD13, eATmegaPinFunc::TOC3B };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD12, eATmegaPinFunc::TOC3C };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD11, eATmegaPinFunc::TIMER3_CLKI };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD10 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD9 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_AD8 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_D) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER0_CLKI };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER1_CLKI };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART1_CLK };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER1_ICP };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT3, eATmegaPinFunc::USART1_TXD };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT2, eATmegaPinFunc::USART1_RXD };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT1, eATmegaPinFunc::TWI_SDA, eATmegaPinFunc::TOC2B };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT0, eATmegaPinFunc::TWI_CLK, eATmegaPinFunc::TOC0B };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_E) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT7, eATmegaPinFunc::AIN1, eATmegaPinFunc::UVCON };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT6, eATmegaPinFunc::AIN0 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT5, eATmegaPinFunc::TOSC2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT4, eATmegaPinFunc::TOSC2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::UID };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_ALE };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_RD };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EXTMEM_WR };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_F) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC7 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC6 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC5 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC4 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC3 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC1 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC0 };
+        return { funcs, countof(funcs) };
+      }
+    }
+  #elif defined(__AVR_TRM05__)
+    if (info.port == eATmegaPort::PORT_A) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC7, eATmegaPinFunc::PCI7 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC6, eATmegaPinFunc::PCI6 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC5, eATmegaPinFunc::PCI5 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC4, eATmegaPinFunc::PCI4 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC3, eATmegaPinFunc::PCI3 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC2, eATmegaPinFunc::PCI2 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC1, eATmegaPinFunc::PCI1 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::ADC0, eATmegaPinFunc::PCI0 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_B) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_SCK, eATmegaPinFunc::PCI15 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_MISO, eATmegaPinFunc::PCI14 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_MOSI, eATmegaPinFunc::PCI13 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::SPI_CS, eATmegaPinFunc::TOC0B, eATmegaPinFunc::PCI12 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::AIN1, eATmegaPinFunc::TOC0A, eATmegaPinFunc::PCI11 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::AIN0, eATmegaPinFunc::EINT2, eATmegaPinFunc::PCI10 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER1_ECI, eATmegaPinFunc::CLKO, eATmegaPinFunc::PCI9 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER0_ECI, eATmegaPinFunc::USART0_CLK, eATmegaPinFunc::PCI8 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_C) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOSC2, eATmegaPinFunc::PCI23 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOSC1, eATmegaPinFunc::PCI22 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI21 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI20 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI19 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::PCI18 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TWI_SDA, eATmegaPinFunc::PCI17 };
+        return { funcs, countof(funcs) };
+      }
+      else if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TWI_CLK, eATmegaPinFunc::PCI16 };
+        return { funcs, countof(funcs) };
+      }
+    }
+    else if (info.port == eATmegaPort::PORT_D) {
+      if (info.pinidx == 7) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC2A, eATmegaPinFunc::PCI31 };
+        return { funcs, countof(funcs) };
+      }
+      if (info.pinidx == 6) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TIMER1_ICP, eATmegaPinFunc::TOC2B, eATmegaPinFunc::PCI30 };
+        return { funcs, countof(funcs) };
+      }
+      if (info.pinidx == 5) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC1A, eATmegaPinFunc::PCI29 };
+        return { funcs, countof(funcs) };
+      }
+      if (info.pinidx == 4) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::TOC1B, eATmegaPinFunc::USART1_CLK, eATmegaPinFunc::PCI28 };
+        return { funcs, countof(funcs) };
+      }
+      if (info.pinidx == 3) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT1, eATmegaPinFunc::USART1_TXD, eATmegaPinFunc::PCI27 };
+        return { funcs, countof(funcs) };
+      }
+      if (info.pinidx == 2) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::EINT0, eATmegaPinFunc::USART1_RXD, eATmegaPinFunc::PCI26 };
+        return { funcs, countof(funcs) };
+      }
+      if (info.pinidx == 1) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART0_TXD, eATmegaPinFunc::PCI25 };
+        return { funcs, countof(funcs) };
+      }
+      if (info.pinidx == 0) {
+        static const eATmegaPinFunc funcs[] = { eATmegaPinFunc::USART0_RXD, eATmegaPinFunc::PCI24 };
+        return { funcs, countof(funcs) };
+      }
+    }
+  #endif
+
+  return ATmegaPinFunctions();  // default and empty.
+}
+
+#endif // HAL_AVR_DIRTY_INIT
+#endif // __AVR__

Marlin/src/HAL/AVR/spi_pins.h

@@ -0,0 +1,63 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * Define SPI Pins: SCK, MISO, MOSI, SS
+ * Platform pins have parentheses, e.g., "(53)", so we cannot use them.
+ */
+#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__)
+  #define _PIN_SPI_SCK  13
+  #define _PIN_SPI_MISO 12
+  #define _PIN_SPI_MOSI 11
+  #define _PIN_SPI_SS   10
+#elif defined(__AVR_ATmega644__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__) || defined(__AVR_ATmega1284P__)
+  #define _PIN_SPI_SCK  7
+  #define _PIN_SPI_MISO 6
+  #define _PIN_SPI_MOSI 5
+  #define _PIN_SPI_SS   4
+#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+  #define _PIN_SPI_SCK  52
+  #define _PIN_SPI_MISO 50
+  #define _PIN_SPI_MOSI 51
+  #define _PIN_SPI_SS   53
+#elif defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__)
+  #define _PIN_SPI_SCK  21
+  #define _PIN_SPI_MISO 23
+  #define _PIN_SPI_MOSI 22
+  #define _PIN_SPI_SS   20
+#elif defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__)
+  #define _PIN_SPI_SCK  10
+  #define _PIN_SPI_MISO 12
+  #define _PIN_SPI_MOSI 11
+  #define _PIN_SPI_SS   16
+#endif
+
+#ifndef SD_SCK_PIN
+  #define SD_SCK_PIN  _PIN_SPI_SCK
+#endif
+#ifndef SD_MISO_PIN
+  #define SD_MISO_PIN _PIN_SPI_MISO
+#endif
+#ifndef SD_MOSI_PIN
+  #define SD_MOSI_PIN _PIN_SPI_MOSI
+#endif

Marlin/src/HAL/AVR/timers.h

@@ -0,0 +1,261 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include <stdint.h>
+
+// ------------------------
+// Types
+// ------------------------
+
+typedef uint16_t hal_timer_t;
+#define HAL_TIMER_TYPE_MAX hal_timer_t(UINT16_MAX)
+
+// ------------------------
+// Defines
+// ------------------------
+
+#define HAL_TIMER_RATE          ((F_CPU) / 8)    // i.e., 2MHz or 2.5MHz
+
+#ifndef MF_TIMER_STEP
+  #define MF_TIMER_STEP         1
+#endif
+#ifndef MF_TIMER_PULSE
+  #define MF_TIMER_PULSE        MF_TIMER_STEP
+#endif
+#ifndef MF_TIMER_TEMP
+  #define MF_TIMER_TEMP         0
+#endif
+
+#define TEMP_TIMER_FREQUENCY        (((F_CPU) + 0x2000) / 0x4000)
+
+#define STEPPER_TIMER_RATE          HAL_TIMER_RATE
+#define STEPPER_TIMER_PRESCALE      8
+#define STEPPER_TIMER_TICKS_PER_US  ((STEPPER_TIMER_RATE) / 1000000UL)              // (MHz) Stepper Timer ticks per µs
+
+#define PULSE_TIMER_RATE            STEPPER_TIMER_RATE                              // (Hz) Frequency of Pulse Timer
+#define PULSE_TIMER_PRESCALE        STEPPER_TIMER_PRESCALE
+
+#define ENABLE_STEPPER_DRIVER_INTERRUPT()  SBI(TIMSK1, OCIE1A)
+#define DISABLE_STEPPER_DRIVER_INTERRUPT() CBI(TIMSK1, OCIE1A)
+#define STEPPER_ISR_ENABLED()             TEST(TIMSK1, OCIE1A)
+
+#define ENABLE_TEMPERATURE_INTERRUPT()     SBI(TIMSK0, OCIE0A)
+#define DISABLE_TEMPERATURE_INTERRUPT()    CBI(TIMSK0, OCIE0A)
+#define TEMPERATURE_ISR_ENABLED()         TEST(TIMSK0, OCIE0A)
+
+FORCE_INLINE void HAL_timer_start(const uint8_t timer_num, const uint32_t) {
+  switch (timer_num) {
+    case MF_TIMER_STEP:
+      // waveform generation = 0100 = CTC
+      SET_WGM(1, CTC_OCRnA);
+
+      // output mode = 00 (disconnected)
+      SET_COMA(1, NORMAL);
+
+      // Set the timer pre-scaler
+      // Generally we use a divider of 8, resulting in a 2MHz timer
+      // frequency on a 16MHz MCU. If you are going to change this, be
+      // sure to regenerate speed_lookuptable.h with
+      // create_speed_lookuptable.py
+      SET_CS(1, PRESCALER_8);  //  CS 2 = 1/8 prescaler
+
+      // Init Stepper ISR to 122 Hz for quick starting
+      // (F_CPU) / (STEPPER_TIMER_PRESCALE) / frequency
+      OCR1A = 0x4000;
+      TCNT1 = 0;
+      break;
+
+    case MF_TIMER_TEMP:
+      // Use timer0 for temperature measurement
+      // Interleave temperature interrupt with millies interrupt
+      OCR0A = 128;
+      break;
+  }
+}
+
+#define TIMER_OCR_1             OCR1A
+#define TIMER_COUNTER_1         TCNT1
+
+#define TIMER_OCR_0             OCR0A
+#define TIMER_COUNTER_0         TCNT0
+
+#define _CAT(a,V...) a##V
+#define HAL_timer_set_compare(timer, compare) (_CAT(TIMER_OCR_, timer) = compare)
+#define HAL_timer_get_compare(timer) _CAT(TIMER_OCR_, timer)
+#define HAL_timer_get_count(timer) _CAT(TIMER_COUNTER_, timer)
+
+/**
+ * On AVR there is no hardware prioritization and preemption of
+ * interrupts, so this emulates it. The UART has first priority
+ * (otherwise, characters will be lost due to UART overflow).
+ * Then: Stepper, Endstops, Temperature, and -finally- all others.
+ */
+inline void HAL_timer_isr_prologue(const uint8_t) {}
+inline void HAL_timer_isr_epilogue(const uint8_t) {}
+
+#ifndef HAL_STEP_TIMER_ISR
+
+/* 18 cycles maximum latency */
+#define HAL_STEP_TIMER_ISR() \
+extern "C" void TIMER1_COMPA_vect() __attribute__ ((signal, naked, used, externally_visible)); \
+extern "C" void TIMER1_COMPA_vect_bottom() asm ("TIMER1_COMPA_vect_bottom") __attribute__ ((used, externally_visible, noinline)); \
+void TIMER1_COMPA_vect() { \
+  __asm__ __volatile__ ( \
+    A("push r16")                      /* 2 Save R16 */ \
+    A("in r16, __SREG__")              /* 1 Get SREG */ \
+    A("push r16")                      /* 2 Save SREG into stack */ \
+    A("lds r16, %[timsk0]")            /* 2 Load into R0 the Temperature timer Interrupt mask register */ \
+    A("push r16")                      /* 2 Save TIMSK0 into the stack */ \
+    A("andi r16,~%[msk0]")             /* 1 Disable the temperature ISR */ \
+    A("sts %[timsk0], r16")            /* 2 And set the new value */ \
+    A("lds r16, %[timsk1]")            /* 2 Load into R0 the stepper timer Interrupt mask register [TIMSK1] */ \
+    A("andi r16,~%[msk1]")             /* 1 Disable the stepper ISR */ \
+    A("sts %[timsk1], r16")            /* 2 And set the new value */ \
+    A("push r16")                      /* 2 Save TIMSK1 into stack */ \
+    A("in r16, 0x3B")                  /* 1 Get RAMPZ register */ \
+    A("push r16")                      /* 2 Save RAMPZ into stack */ \
+    A("in r16, 0x3C")                  /* 1 Get EIND register */ \
+    A("push r0")                       /* C runtime can modify all the following registers without restoring them */ \
+    A("push r1")                       \
+    A("push r18")                      \
+    A("push r19")                      \
+    A("push r20")                      \
+    A("push r21")                      \
+    A("push r22")                      \
+    A("push r23")                      \
+    A("push r24")                      \
+    A("push r25")                      \
+    A("push r26")                      \
+    A("push r27")                      \
+    A("push r30")                      \
+    A("push r31")                      \
+    A("clr r1")                        /* C runtime expects this register to be 0 */ \
+    A("call TIMER1_COMPA_vect_bottom") /* Call the bottom handler - No inlining allowed, otherwise registers used are not saved */   \
+    A("pop r31")                       \
+    A("pop r30")                       \
+    A("pop r27")                       \
+    A("pop r26")                       \
+    A("pop r25")                       \
+    A("pop r24")                       \
+    A("pop r23")                       \
+    A("pop r22")                       \
+    A("pop r21")                       \
+    A("pop r20")                       \
+    A("pop r19")                       \
+    A("pop r18")                       \
+    A("pop r1")                        \
+    A("pop r0")                        \
+    A("out 0x3C, r16")                 /* 1 Restore EIND register */ \
+    A("pop r16")                       /* 2 Get the original RAMPZ register value */ \
+    A("out 0x3B, r16")                 /* 1 Restore RAMPZ register to its original value */ \
+    A("pop r16")                       /* 2 Get the original TIMSK1 value but with stepper ISR disabled */ \
+    A("ori r16,%[msk1]")               /* 1 Reenable the stepper ISR */ \
+    A("cli")                           /* 1 Disable global interrupts - Reenabling Stepper ISR can reenter amd temperature can reenter, and we want that, if it happens, after this ISR has ended */ \
+    A("sts %[timsk1], r16")            /* 2 And restore the old value - This reenables the stepper ISR */ \
+    A("pop r16")                       /* 2 Get the temperature timer Interrupt mask register [TIMSK0] */ \
+    A("sts %[timsk0], r16")            /* 2 And restore the old value - This reenables the temperature ISR */ \
+    A("pop r16")                       /* 2 Get the old SREG value */ \
+    A("out __SREG__, r16")             /* 1 And restore the SREG value */ \
+    A("pop r16")                       /* 2 Restore R16 value */ \
+    A("reti")                          /* 4 Return from interrupt */ \
+    :                                   \
+    : [timsk0] "i" ((uint16_t)&TIMSK0), \
+      [timsk1] "i" ((uint16_t)&TIMSK1), \
+      [msk0] "M" ((uint8_t)(1<<OCIE0A)),\
+      [msk1] "M" ((uint8_t)(1<<OCIE1A)) \
+    : \
+  ); \
+} \
+void TIMER1_COMPA_vect_bottom()
+
+#endif // HAL_STEP_TIMER_ISR
+
+#ifndef HAL_TEMP_TIMER_ISR
+
+/* 14 cycles maximum latency */
+#define HAL_TEMP_TIMER_ISR() \
+extern "C" void TIMER0_COMPA_vect() __attribute__ ((signal, naked, used, externally_visible)); \
+extern "C" void TIMER0_COMPA_vect_bottom()  asm ("TIMER0_COMPA_vect_bottom") __attribute__ ((used, externally_visible, noinline)); \
+void TIMER0_COMPA_vect() { \
+  __asm__ __volatile__ ( \
+    A("push r16")                       /* 2 Save R16 */ \
+    A("in r16, __SREG__")               /* 1 Get SREG */ \
+    A("push r16")                       /* 2 Save SREG into stack */ \
+    A("lds r16, %[timsk0]")             /* 2 Load into R0 the Temperature timer Interrupt mask register */ \
+    A("andi r16,~%[msk0]")              /* 1 Disable the temperature ISR */ \
+    A("sts %[timsk0], r16")             /* 2 And set the new value */ \
+    A("sei")                            /* 1 Enable global interrupts - It is safe, as the temperature ISR is disabled, so we cannot reenter it */    \
+    A("push r16")                       /* 2 Save TIMSK0 into stack */ \
+    A("in r16, 0x3B")                   /* 1 Get RAMPZ register */ \
+    A("push r16")                       /* 2 Save RAMPZ into stack */ \
+    A("in r16, 0x3C")                   /* 1 Get EIND register */ \
+    A("push r0")                        /* C runtime can modify all the following registers without restoring them */ \
+    A("push r1")                        \
+    A("push r18")                       \
+    A("push r19")                       \
+    A("push r20")                       \
+    A("push r21")                       \
+    A("push r22")                       \
+    A("push r23")                       \
+    A("push r24")                       \
+    A("push r25")                       \
+    A("push r26")                       \
+    A("push r27")                       \
+    A("push r30")                       \
+    A("push r31")                       \
+    A("clr r1")                         /* C runtime expects this register to be 0 */ \
+    A("call TIMER0_COMPA_vect_bottom")  /* Call the bottom handler - No inlining allowed, otherwise registers used are not saved */   \
+    A("pop r31")                        \
+    A("pop r30")                        \
+    A("pop r27")                        \
+    A("pop r26")                        \
+    A("pop r25")                        \
+    A("pop r24")                        \
+    A("pop r23")                        \
+    A("pop r22")                        \
+    A("pop r21")                        \
+    A("pop r20")                        \
+    A("pop r19")                        \
+    A("pop r18")                        \
+    A("pop r1")                         \
+    A("pop r0")                         \
+    A("out 0x3C, r16")                  /* 1 Restore EIND register */ \
+    A("pop r16")                        /* 2 Get the original RAMPZ register value */ \
+    A("out 0x3B, r16")                  /* 1 Restore RAMPZ register to its original value */ \
+    A("pop r16")                        /* 2 Get the original TIMSK0 value but with temperature ISR disabled */ \
+    A("ori r16,%[msk0]")                /* 1 Enable temperature ISR */ \
+    A("cli")                            /* 1 Disable global interrupts - We must do this, as we will reenable the temperature ISR, and we don't want to reenter this handler until the current one is done */ \
+    A("sts %[timsk0], r16")             /* 2 And restore the old value */ \
+    A("pop r16")                        /* 2 Get the old SREG */ \
+    A("out __SREG__, r16")              /* 1 And restore the SREG value */ \
+    A("pop r16")                        /* 2 Restore R16 */ \
+    A("reti")                           /* 4 Return from interrupt */ \
+    :                                   \
+    : [timsk0] "i"((uint16_t)&TIMSK0),  \
+      [msk0] "M" ((uint8_t)(1<<OCIE0A)) \
+    : \
+  ); \
+} \
+void TIMER0_COMPA_vect_bottom()
+
+#endif // HAL_TEMP_TIMER_ISR

Marlin/src/HAL/AVR/u8g/LCD_defines.h

@@ -0,0 +1,29 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2023 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * AVR LCD-specific defines
+ */
+
+uint8_t u8g_com_HAL_AVR_sw_sp_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
+#define U8G_COM_HAL_SW_SPI_FN u8g_com_HAL_AVR_sw_sp_fn

Marlin/src/HAL/AVR/u8g/u8g_com_HAL_AVR_sw_spi.cpp

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 
@@ -55,17 +55,17 @@
 
 #if defined(ARDUINO) && !defined(ARDUINO_ARCH_STM32) && !defined(ARDUINO_ARCH_SAM)
 
-#include "../../inc/MarlinConfigPre.h"
+#include "../../../inc/MarlinConfigPre.h"
 
-#if HAS_GRAPHICAL_LCD
+#if HAS_MARLINUI_U8GLIB
 
-#include "../shared/Marduino.h"
-#include "../shared/Delay.h"
+#include "../../shared/Marduino.h"
+#include "../../shared/Delay.h"
 
-#include <U8glib.h>
+#include <U8glib-HAL.h>
 
-uint8_t u8g_bitData, u8g_bitNotData, u8g_bitClock, u8g_bitNotClock;
-volatile uint8_t *u8g_outData, *u8g_outClock;
+static uint8_t u8g_bitData, u8g_bitNotData, u8g_bitClock, u8g_bitNotClock;
+static volatile uint8_t *u8g_outData, *u8g_outClock;
 
 static void u8g_com_arduino_init_shift_out(uint8_t dataPin, uint8_t clockPin) {
   u8g_outData = portOutputRegister(digitalPinToPort(dataPin));
@@ -88,7 +88,7 @@ void u8g_spiSend_sw_AVR_mode_0(uint8_t val) {
   volatile uint8_t *outData = u8g_outData,
                    *outClock = u8g_outClock;
   U8G_ATOMIC_START();
-  for (uint8_t i = 0; i < 8; i++) {
+  for (uint8_t i = 0; i < 8; ++i) {
     if (val & 0x80)
       *outData |= bitData;
     else
@@ -108,7 +108,7 @@ void u8g_spiSend_sw_AVR_mode_3(uint8_t val) {
   volatile uint8_t *outData = u8g_outData,
                    *outClock = u8g_outClock;
   U8G_ATOMIC_START();
-  for (uint8_t i = 0; i < 8; i++) {
+  for (uint8_t i = 0; i < 8; ++i) {
     *outClock &= bitNotClock;
     if (val & 0x80)
       *outData |= bitData;
@@ -120,8 +120,7 @@ void u8g_spiSend_sw_AVR_mode_3(uint8_t val) {
   U8G_ATOMIC_END();
 }
 
-
-#if ENABLED(FYSETC_MINI_12864)
+#if U8G_SPI_USE_MODE_3
   #define SPISEND_SW_AVR u8g_spiSend_sw_AVR_mode_3
 #else
   #define SPISEND_SW_AVR u8g_spiSend_sw_AVR_mode_0
@@ -144,9 +143,9 @@ uint8_t u8g_com_HAL_AVR_sw_sp_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void
       break;
 
     case U8G_COM_MSG_CHIP_SELECT:
-      #if ENABLED(FYSETC_MINI_12864)           // LCD SPI is running mode 3 while SD card is running mode 0
-        if (arg_val) {                         //   SCK idle state needs to be set to the proper idle state before
-                                               //   the next chip select goes active
+      #if U8G_SPI_USE_MODE_3                                  // LCD SPI is running mode 3 while SD card is running mode 0
+        if (arg_val) {                                        // SCK idle state needs to be set to the proper idle state before
+                                                              //  the next chip select goes active
           u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, 1);  // Set SCK to mode 3 idle state before CS goes active
           u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
         }
@@ -189,5 +188,5 @@ uint8_t u8g_com_HAL_AVR_sw_sp_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void
   return 1;
 }
 
-#endif // HAS_GRAPHICAL_LCD
+#endif // HAS_MARLINUI_U8GLIB
 #endif // ARDUINO_ARCH_SAM

Marlin/src/HAL/DUE/HAL.cpp

@@ -0,0 +1,207 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * HAL for Arduino Due and compatible (SAM3X8E)
+ */
+
+#ifdef ARDUINO_ARCH_SAM
+
+#include "../../inc/MarlinConfig.h"
+
+#include <Wire.h>
+#include "usb/usb_task.h"
+
+// ------------------------
+// Public Variables
+// ------------------------
+
+uint16_t MarlinHAL::adc_result;
+
+// ------------------------
+// Public functions
+// ------------------------
+
+#if ENABLED(POSTMORTEM_DEBUGGING)
+  extern void install_min_serial();
+#endif
+
+void MarlinHAL::init() {
+  #if HAS_MEDIA
+    OUT_WRITE(SD_SS_PIN, HIGH);  // Try to set SDSS inactive before any other SPI users start up
+  #endif
+  usb_task_init();          // Initialize the USB stack
+  TERN_(POSTMORTEM_DEBUGGING, install_min_serial()); // Install the min serial handler
+}
+
+void MarlinHAL::init_board() {
+  #ifdef BOARD_INIT
+    BOARD_INIT();
+  #endif
+}
+
+void MarlinHAL::idletask() { usb_task_idle(); } // Perform USB stack housekeeping
+
+uint8_t MarlinHAL::get_reset_source() {
+  switch ((RSTC->RSTC_SR >> 8) & 0x07) {
+    case 0: return RST_POWER_ON;
+    case 1: return RST_BACKUP;
+    case 2: return RST_WATCHDOG;
+    case 3: return RST_SOFTWARE;
+    case 4: return RST_EXTERNAL;
+    default: return 0;
+  }
+}
+
+void MarlinHAL::reboot() { rstc_start_software_reset(RSTC); }
+
+// ------------------------
+// Watchdog Timer
+// ------------------------
+
+#if ENABLED(USE_WATCHDOG)
+
+  // Initialize watchdog - On SAM3X, Watchdog was already configured
+  //  and enabled or disabled at startup, so no need to reconfigure it
+  //  here.
+  void MarlinHAL::watchdog_init() { WDT_Restart(WDT); } // Reset watchdog to start clean
+
+  // Reset watchdog. MUST be called at least every 4 seconds after the
+  // first watchdog_init or AVR will go into emergency procedures.
+  void MarlinHAL::watchdog_refresh() { watchdogReset(); }
+
+#endif
+
+// Override Arduino runtime to either config or disable the watchdog
+//
+// We need to configure the watchdog as soon as possible in the boot
+// process, because watchdog initialization at hardware reset on SAM3X8E
+// is unreliable, and there is risk of unintended resets if we delay
+// that initialization to a later time.
+void watchdogSetup() {
+
+  #if ENABLED(USE_WATCHDOG)
+
+    #ifndef WATCHDOG_PIO_RESET
+      #define WATCHDOG_PIO_RESET
+    #endif
+
+    // 4 seconds timeout
+    uint32_t timeout = TERN(WATCHDOG_DURATION_8S, 8000, 4000);
+
+    // Calculate timeout value in WDT counter ticks: This assumes
+    // the slow clock is running at 32.768 kHz watchdog
+    // frequency is therefore 32768 / 128 = 256 Hz
+    timeout = (timeout << 8) / 1000;
+    if (timeout == 0)
+      timeout = 1;
+    else if (timeout > 0xFFF)
+      timeout = 0xFFF;
+
+    // We want to enable the watchdog with the specified timeout
+    uint32_t value = (0
+      | WDT_MR_WDV(timeout)               // With the specified timeout
+      | WDT_MR_WDD(timeout)               // and no invalid write window
+      #if NONE(WATCHDOG_PIO_RESET, SAMV70, SAMV71, SAME70, SAMS70)
+        | WDT_MR_WDRPROC                  // WDT fault resets processor only with this flag.
+                                          // Omit to also reset the PIO controller.
+      #endif
+      | WDT_MR_WDDBGHLT                   // WDT stops in debug state.
+      | WDT_MR_WDIDLEHLT                  // WDT stops in idle state.
+    );
+
+    #if ENABLED(WATCHDOG_RESET_MANUAL)
+      // We enable the watchdog timer, but only for the interrupt.
+
+      // Configure WDT to only trigger an interrupt
+      value |= WDT_MR_WDFIEN;             // Enable WDT fault interrupt.
+
+      // Disable WDT interrupt (just in case, to avoid triggering it!)
+      NVIC_DisableIRQ(WDT_IRQn);
+
+      // We NEED memory barriers to ensure Interrupts are actually disabled!
+      // ( https://dzone.com/articles/nvic-disabling-interrupts-on-arm-cortex-m-and-the )
+      __DSB();
+      __ISB();
+
+      // Initialize WDT with the given parameters
+      WDT_Enable(WDT, value);
+
+      // Configure and enable WDT interrupt.
+      NVIC_ClearPendingIRQ(WDT_IRQn);
+      NVIC_SetPriority(WDT_IRQn, 0); // Use highest priority, so we detect all kinds of lockups
+      NVIC_EnableIRQ(WDT_IRQn);
+
+    #else
+
+      // a WDT fault triggers a reset
+      value |= WDT_MR_WDRSTEN;
+
+      // Initialize WDT with the given parameters
+      WDT_Enable(WDT, value);
+
+    #endif
+
+    // Reset the watchdog
+    WDT_Restart(WDT);
+
+  #else
+
+    // Make sure to completely disable the Watchdog
+    WDT_Disable(WDT);
+
+  #endif
+}
+
+// ------------------------
+// Free Memory Accessor
+// ------------------------
+
+extern "C" {
+  extern unsigned int _ebss; // end of bss section
+}
+
+// Return free memory between end of heap (or end bss) and whatever is current
+int freeMemory() {
+  int free_memory, heap_end = (int)_sbrk(0);
+  return (int)&free_memory - (heap_end ?: (int)&_ebss);
+}
+
+// ------------------------
+// Serial Ports
+// ------------------------
+
+// Forward the default serial ports
+#if USING_HW_SERIAL0
+  DefaultSerial1 MSerial0(false, Serial);
+#endif
+#if USING_HW_SERIAL1
+  DefaultSerial2 MSerial1(false, Serial1);
+#endif
+#if USING_HW_SERIAL2
+  DefaultSerial3 MSerial2(false, Serial2);
+#endif
+#if USING_HW_SERIAL3
+  DefaultSerial4 MSerial3(false, Serial3);
+#endif
+
+#endif // ARDUINO_ARCH_SAM

Marlin/src/HAL/DUE/HAL.h

@@ -0,0 +1,175 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * HAL for Arduino Due and compatible (SAM3X8E)
+ */
+
+#define CPU_32_BIT
+
+#include "../shared/Marduino.h"
+#include "../shared/eeprom_if.h"
+#include "../shared/math_32bit.h"
+#include "../shared/HAL_SPI.h"
+#include "fastio.h"
+
+#include <stdint.h>
+
+//
+// Serial Ports
+//
+
+#include "MarlinSerial.h"
+#include "MarlinSerialUSB.h"
+
+// ------------------------
+// Types
+// ------------------------
+
+typedef int8_t pin_t;
+
+#define SHARED_SERVOS HAS_SERVOS  // Use shared/servos.cpp
+
+class Servo;
+typedef Servo hal_servo_t;
+
+//
+// Interrupts
+//
+#define sei() interrupts()
+#define cli() noInterrupts()
+
+#define CRITICAL_SECTION_START()  const bool _irqon = hal.isr_state(); hal.isr_off()
+#define CRITICAL_SECTION_END()    if (_irqon) hal.isr_on()
+
+//
+// ADC
+//
+#define HAL_ADC_VREF_MV   3300
+#define HAL_ADC_RESOLUTION  10
+
+#ifndef analogInputToDigitalPin
+  #define analogInputToDigitalPin(p) pin_t((p < 12U) ? (p) + 54U : -1)
+#endif
+
+//
+// Pin Mapping for M42, M43, M226
+//
+#define GET_PIN_MAP_PIN(index) index
+#define GET_PIN_MAP_INDEX(pin) pin
+#define PARSED_PIN_INDEX(code, dval) parser.intval(code, dval)
+
+//
+// Tone
+//
+void tone(const pin_t _pin, const unsigned int frequency, const unsigned long duration=0);
+void noTone(const pin_t _pin);
+
+// ------------------------
+// Class Utilities
+// ------------------------
+
+#pragma GCC diagnostic push
+#if GCC_VERSION <= 50000
+  #pragma GCC diagnostic ignored "-Wunused-function"
+#endif
+
+#pragma GCC diagnostic pop
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+char *dtostrf(double __val, signed char __width, unsigned char __prec, char *__s);
+#ifdef __cplusplus
+  }
+#endif
+
+// Return free RAM between end of heap (or end bss) and whatever is current
+int freeMemory();
+
+// ------------------------
+// MarlinHAL Class
+// ------------------------
+
+class MarlinHAL {
+public:
+
+  // Earliest possible init, before setup()
+  MarlinHAL() {}
+
+  // Watchdog
+  static void watchdog_init()    IF_DISABLED(USE_WATCHDOG, {});
+  static void watchdog_refresh() IF_DISABLED(USE_WATCHDOG, {});
+
+  static void init();          // Called early in setup()
+  static void init_board();    // Called less early in setup()
+  static void reboot();        // Restart the firmware
+
+  // Interrupts
+  static bool isr_state() { return !__get_PRIMASK(); }
+  static void isr_on()  { __enable_irq(); }
+  static void isr_off() { __disable_irq(); }
+
+  static void delay_ms(const int ms) { delay(ms); }
+
+  // Tasks, called from marlin.idle()
+  static void idletask();
+
+  // Reset
+  static uint8_t get_reset_source();
+  static void clear_reset_source() {}
+
+  // Free SRAM
+  static int freeMemory() { return ::freeMemory(); }
+
+  //
+  // ADC Methods
+  //
+
+  static uint16_t adc_result;
+
+  // Called by Temperature::init once at startup
+  static void adc_init() {}
+
+  // Called by Temperature::init for each sensor at startup
+  static void adc_enable(const uint8_t /*ch*/) {}
+
+  // Begin ADC sampling on the given channel. Called from Temperature::isr!
+  static void adc_start(const uint8_t ch) { adc_result = analogRead(ch); }
+
+  // Is the ADC ready for reading?
+  static bool adc_ready() { return true; }
+
+  // The current value of the ADC register
+  static uint16_t adc_value() { return adc_result; }
+
+  /**
+   * Set the PWM duty cycle for the pin to the given value.
+   * No inverting the duty cycle in this HAL.
+   * No changing the maximum size of the provided value to enable finer PWM duty control in this HAL.
+   */
+  static void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t=255, const bool=false) {
+    analogWrite(pin, v);
+  }
+
+};

Marlin/src/HAL/DUE/HAL_SPI.cpp

@@ -0,0 +1,818 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Software SPI functions originally from Arduino Sd2Card Library
+ * Copyright (c) 2009 by William Greiman
+ *
+ * Completely rewritten and tuned by Eduardo José Tagle in 2017/2018
+ * in ARM thumb2 inline assembler and tuned for maximum speed and performance
+ * allowing SPI clocks of up to 12 Mhz to increase SD card read/write performance
+ */
+
+/**
+ * HAL for Arduino Due and compatible (SAM3X8E)
+ */
+
+#ifdef ARDUINO_ARCH_SAM
+
+#include "../../inc/MarlinConfig.h"
+#include "../shared/Delay.h"
+
+// ------------------------
+// Public functions
+// ------------------------
+
+#if ANY(SOFTWARE_SPI, FORCE_SOFT_SPI)
+
+  // ------------------------
+  // Software SPI
+  // ------------------------
+
+  // Make sure GCC optimizes this file.
+  // Note that this line triggers a bug in GCC which is fixed by casting.
+  // See the note below.
+  #pragma GCC optimize (3)
+
+  typedef uint8_t (*pfnSpiTransfer)(uint8_t b);
+  typedef void    (*pfnSpiRxBlock)(uint8_t *buf, uint32_t nbyte);
+  typedef void    (*pfnSpiTxBlock)(const uint8_t *buf, uint32_t nbyte);
+
+  /* ---------------- Macros to be able to access definitions from asm */
+  #define _PORT(IO) DIO ##  IO ## _WPORT
+  #define _PIN_MASK(IO) MASK(DIO ## IO ## _PIN)
+  #define _PIN_SHIFT(IO) DIO ## IO ## _PIN
+  #define PORT(IO) _PORT(IO)
+  #define PIN_MASK(IO) _PIN_MASK(IO)
+  #define PIN_SHIFT(IO) _PIN_SHIFT(IO)
+
+  // run at ~8 .. ~10Mhz - Tx version (Rx data discarded)
+  static uint8_t spiTransferTx0(uint8_t bout) { // using Mode 0
+    uint32_t MOSI_PORT_PLUS30 = ((uint32_t) PORT(SD_MOSI_PIN)) + 0x30;  /* SODR of port */
+    uint32_t MOSI_MASK = PIN_MASK(SD_MOSI_PIN);
+    uint32_t SCK_PORT_PLUS30 = ((uint32_t) PORT(SD_SCK_PIN)) + 0x30;    /* SODR of port */
+    uint32_t SCK_MASK = PIN_MASK(SD_SCK_PIN);
+    uint32_t idx = 0;
+
+    /* Negate bout, as the assembler requires a negated value */
+    bout = ~bout;
+
+    /* The software SPI routine */
+    __asm__ __volatile__(
+      A(".syntax unified") // is to prevent CM0,CM1 non-unified syntax
+
+      /* Bit 7 */
+      A("ubfx %[idx],%[txval],#7,#1")                      /* Place bit 7 in bit 0 of idx*/
+
+      A("str %[mosi_mask],[%[mosi_port], %[idx],LSL #2]")  /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[idx],%[txval],#6,#1")                      /* Place bit 6 in bit 0 of idx*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 6 */
+      A("str %[mosi_mask],[%[mosi_port], %[idx],LSL #2]")  /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[idx],%[txval],#5,#1")                      /* Place bit 5 in bit 0 of idx*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 5 */
+      A("str %[mosi_mask],[%[mosi_port], %[idx],LSL #2]")  /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[idx],%[txval],#4,#1")                      /* Place bit 4 in bit 0 of idx*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 4 */
+      A("str %[mosi_mask],[%[mosi_port], %[idx],LSL #2]")  /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[idx],%[txval],#3,#1")                      /* Place bit 3 in bit 0 of idx*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 3 */
+      A("str %[mosi_mask],[%[mosi_port], %[idx],LSL #2]")  /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[idx],%[txval],#2,#1")                      /* Place bit 2 in bit 0 of idx*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 2 */
+      A("str %[mosi_mask],[%[mosi_port], %[idx],LSL #2]")  /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[idx],%[txval],#1,#1")                      /* Place bit 1 in bit 0 of idx*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 1 */
+      A("str %[mosi_mask],[%[mosi_port], %[idx],LSL #2]")  /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[idx],%[txval],#0,#1")                      /* Place bit 0 in bit 0 of idx*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 0 */
+      A("str %[mosi_mask],[%[mosi_port], %[idx],LSL #2]")  /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("nop")                                             /* Result will be 0 */
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      : [idx]"+r"( idx )
+      : [txval]"r"( bout ) ,
+        [mosi_mask]"r"( MOSI_MASK ),
+        [mosi_port]"r"( MOSI_PORT_PLUS30 ),
+        [sck_mask]"r"( SCK_MASK ),
+        [sck_port]"r"( SCK_PORT_PLUS30 )
+      : "cc"
+    );
+
+    return 0;
+  }
+
+   // Calculates the bit band alias address and returns a pointer address to word.
+   // addr: The byte address of bitbanding bit.
+   // bit:  The bit position of bitbanding bit.
+  #define BITBAND_ADDRESS(addr, bit) \
+    (((uint32_t)(addr) & 0xF0000000) + 0x02000000 + ((uint32_t)(addr)&0xFFFFF)*32 + (bit)*4)
+
+  // run at ~8 .. ~10Mhz - Rx version (Tx line not altered)
+  static uint8_t spiTransferRx0(uint8_t) { // using Mode 0
+    uint32_t bin = 0;
+    uint32_t work = 0;
+    uint32_t BITBAND_MISO_PORT = BITBAND_ADDRESS( ((uint32_t)PORT(SD_MISO_PIN))+0x3C, PIN_SHIFT(SD_MISO_PIN));  /* PDSR of port in bitband area */
+    uint32_t SCK_PORT_PLUS30 = ((uint32_t) PORT(SD_SCK_PIN)) + 0x30;    /* SODR of port */
+    uint32_t SCK_MASK = PIN_MASK(SD_SCK_PIN);
+
+    /* The software SPI routine */
+    __asm__ __volatile__(
+      A(".syntax unified") // is to prevent CM0,CM1 non-unified syntax
+
+      /* bit 7 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#7,#1")                /* Store read bit as the bit 7 */
+
+      /* bit 6 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#6,#1")                /* Store read bit as the bit 6 */
+
+      /* bit 5 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#5,#1")                /* Store read bit as the bit 5 */
+
+      /* bit 4 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#4,#1")                /* Store read bit as the bit 4 */
+
+      /* bit 3 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#3,#1")                /* Store read bit as the bit 3 */
+
+      /* bit 2 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#2,#1")                /* Store read bit as the bit 2 */
+
+      /* bit 1 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#1,#1")                /* Store read bit as the bit 1 */
+
+      /* bit 0 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#0,#1")                /* Store read bit as the bit 0 */
+
+      : [bin]"+r"( bin ),
+        [work]"+r"( work )
+      : [bitband_miso_port]"r"( BITBAND_MISO_PORT ),
+        [sck_mask]"r"( SCK_MASK ),
+        [sck_port]"r"( SCK_PORT_PLUS30 )
+      : "cc"
+    );
+
+    return bin;
+  }
+
+  // run at ~4Mhz
+  static uint8_t spiTransfer1(uint8_t b) { // using Mode 0
+    int bits = 8;
+    do {
+      WRITE(SD_MOSI_PIN, b & 0x80);
+      b <<= 1;        // little setup time
+
+      WRITE(SD_SCK_PIN, HIGH);
+      DELAY_NS(125);  // 10 cycles @ 84mhz
+
+      b |= (READ(SD_MISO_PIN) != 0);
+
+      WRITE(SD_SCK_PIN, LOW);
+      DELAY_NS(125);  // 10 cycles @ 84mhz
+    } while (--bits);
+    return b;
+  }
+
+  // all the others
+  static uint16_t spiDelayNS = 4000; // 4000ns => 125khz
+
+  static uint8_t spiTransferX(uint8_t b) { // using Mode 0
+    int bits = 8;
+    do {
+      WRITE(SD_MOSI_PIN, b & 0x80);
+      b <<= 1; // little setup time
+
+      WRITE(SD_SCK_PIN, HIGH);
+      DELAY_NS_VAR(spiDelayNS);
+
+      b |= (READ(SD_MISO_PIN) != 0);
+
+      WRITE(SD_SCK_PIN, LOW);
+      DELAY_NS_VAR(spiDelayNS);
+    } while (--bits);
+    return b;
+  }
+
+  // Pointers to generic functions for byte transfers
+
+  /**
+   * Note: The cast is unnecessary, but without it, this file triggers a GCC 4.8.3-2014 bug.
+   * Later GCC versions do not have this problem, but at this time (May 2018) Arduino still
+   * uses that buggy and obsolete GCC version!!
+   */
+  static pfnSpiTransfer spiTransferRx = (pfnSpiTransfer)spiTransferX;
+  static pfnSpiTransfer spiTransferTx = (pfnSpiTransfer)spiTransferX;
+
+  // Block transfers run at ~8 .. ~10Mhz - Tx version (Rx data discarded)
+  static void spiTxBlock0(const uint8_t *ptr, uint32_t todo) {
+    uint32_t MOSI_PORT_PLUS30 = ((uint32_t) PORT(SD_MOSI_PIN)) + 0x30;  /* SODR of port */
+    uint32_t MOSI_MASK = PIN_MASK(SD_MOSI_PIN);
+    uint32_t SCK_PORT_PLUS30 = ((uint32_t) PORT(SD_SCK_PIN)) + 0x30;    /* SODR of port */
+    uint32_t SCK_MASK = PIN_MASK(SD_SCK_PIN);
+    uint32_t work = 0;
+    uint32_t txval = 0;
+
+    /* The software SPI routine */
+    __asm__ __volatile__(
+      A(".syntax unified") // is to prevent CM0,CM1 non-unified syntax
+
+      L("loop%=")
+      A("ldrb.w %[txval], [%[ptr]], #1")                   /* Load value to send, increment buffer */
+      A("mvn %[txval],%[txval]")                           /* Negate value */
+
+      /* Bit 7 */
+      A("ubfx %[work],%[txval],#7,#1")                     /* Place bit 7 in bit 0 of work*/
+
+      A("str %[mosi_mask],[%[mosi_port], %[work],LSL #2]") /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[work],%[txval],#6,#1")                     /* Place bit 6 in bit 0 of work*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 6 */
+      A("str %[mosi_mask],[%[mosi_port], %[work],LSL #2]") /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[work],%[txval],#5,#1")                     /* Place bit 5 in bit 0 of work*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 5 */
+      A("str %[mosi_mask],[%[mosi_port], %[work],LSL #2]") /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[work],%[txval],#4,#1")                     /* Place bit 4 in bit 0 of work*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 4 */
+      A("str %[mosi_mask],[%[mosi_port], %[work],LSL #2]") /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[work],%[txval],#3,#1")                     /* Place bit 3 in bit 0 of work*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 3 */
+      A("str %[mosi_mask],[%[mosi_port], %[work],LSL #2]") /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[work],%[txval],#2,#1")                     /* Place bit 2 in bit 0 of work*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 2 */
+      A("str %[mosi_mask],[%[mosi_port], %[work],LSL #2]") /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[work],%[txval],#1,#1")                     /* Place bit 1 in bit 0 of work*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 1 */
+      A("str %[mosi_mask],[%[mosi_port], %[work],LSL #2]") /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("ubfx %[work],%[txval],#0,#1")                     /* Place bit 0 in bit 0 of work*/
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+
+      /* Bit 0 */
+      A("str %[mosi_mask],[%[mosi_port], %[work],LSL #2]") /* Access the proper SODR or CODR registers based on that bit */
+      A("str %[sck_mask],[%[sck_port]]")                   /* SODR */
+      A("subs %[todo],#1")                                 /* Decrement count of pending words to send, update status */
+      A("str %[sck_mask],[%[sck_port],#0x4]")              /* CODR */
+      A("bne.n loop%=")                                    /* Repeat until done */
+
+      : [ptr]"+r" ( ptr ) ,
+        [todo]"+r" ( todo ) ,
+        [work]"+r"( work ) ,
+        [txval]"+r"( txval )
+      : [mosi_mask]"r"( MOSI_MASK ),
+        [mosi_port]"r"( MOSI_PORT_PLUS30 ),
+        [sck_mask]"r"( SCK_MASK ),
+        [sck_port]"r"( SCK_PORT_PLUS30 )
+      : "cc"
+    );
+  }
+
+  static void spiRxBlock0(uint8_t *ptr, uint32_t todo) {
+    uint32_t bin = 0;
+    uint32_t work = 0;
+    uint32_t BITBAND_MISO_PORT = BITBAND_ADDRESS(((uint32_t)PORT(SD_MISO_PIN))+0x3C, PIN_SHIFT(SD_MISO_PIN)); /* PDSR of port in bitband area */
+    uint32_t SCK_PORT_PLUS30 = ((uint32_t) PORT(SD_SCK_PIN)) + 0x30;    /* SODR of port */
+    uint32_t SCK_MASK = PIN_MASK(SD_SCK_PIN);
+
+    /* The software SPI routine */
+    __asm__ __volatile__(
+      A(".syntax unified")                  // is to prevent CM0,CM1 non-unified syntax
+
+      L("loop%=")
+
+      /* bit 7 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#7,#1")                /* Store read bit as the bit 7 */
+
+      /* bit 6 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#6,#1")                /* Store read bit as the bit 6 */
+
+      /* bit 5 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#5,#1")                /* Store read bit as the bit 5 */
+
+      /* bit 4 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#4,#1")                /* Store read bit as the bit 4 */
+
+      /* bit 3 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#3,#1")                /* Store read bit as the bit 3 */
+
+      /* bit 2 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#2,#1")                /* Store read bit as the bit 2 */
+
+      /* bit 1 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#1,#1")                /* Store read bit as the bit 1 */
+
+      /* bit 0 */
+      A("str %[sck_mask],[%[sck_port]]")           /* SODR */
+      A("ldr %[work],[%[bitband_miso_port]]")      /* PDSR on bitband area for required bit: work will be 1 or 0 based on port */
+      A("str %[sck_mask],[%[sck_port],#0x4]")      /* CODR */
+      A("bfi %[bin],%[work],#0,#1")                /* Store read bit as the bit 0 */
+
+      A("subs %[todo],#1")                         /* Decrement count of pending words to send, update status */
+      A("strb.w %[bin], [%[ptr]], #1")             /* Store read value into buffer, increment buffer pointer */
+      A("bne.n loop%=")                            /* Repeat until done */
+
+      : [ptr]"+r"( ptr ),
+        [todo]"+r"( todo ),
+        [bin]"+r"( bin ),
+        [work]"+r"( work )
+      : [bitband_miso_port]"r"( BITBAND_MISO_PORT ),
+        [sck_mask]"r"( SCK_MASK ),
+        [sck_port]"r"( SCK_PORT_PLUS30 )
+      : "cc"
+    );
+  }
+
+  static void spiTxBlockX(const uint8_t *buf, uint32_t todo) {
+    do {
+      (void)spiTransferTx(*buf++);
+    } while (--todo);
+  }
+
+  static void spiRxBlockX(uint8_t *buf, uint32_t todo) {
+    do {
+      *buf++ = spiTransferRx(0xFF);
+    } while (--todo);
+  }
+
+  // Pointers to generic functions for block transfers
+  static pfnSpiTxBlock spiTxBlock = (pfnSpiTxBlock)spiTxBlockX;
+  static pfnSpiRxBlock spiRxBlock = (pfnSpiRxBlock)spiRxBlockX;
+
+  #if MB(ALLIGATOR)
+    #define _SS_WRITE(S) WRITE(SD_SS_PIN, S)
+  #else
+    #define _SS_WRITE(S) NOOP
+  #endif
+
+  void spiBegin() {
+    SET_OUTPUT(SD_SS_PIN);
+    _SS_WRITE(HIGH);
+    SET_OUTPUT(SD_SCK_PIN);
+    SET_INPUT(SD_MISO_PIN);
+    SET_OUTPUT(SD_MOSI_PIN);
+  }
+
+  uint8_t spiRec() {
+    _SS_WRITE(LOW);
+    WRITE(SD_MOSI_PIN, HIGH); // Output 1s 1
+    uint8_t b = spiTransferRx(0xFF);
+    _SS_WRITE(HIGH);
+    return b;
+  }
+
+  void spiRead(uint8_t *buf, uint16_t nbyte) {
+    if (nbyte) {
+      _SS_WRITE(LOW);
+      WRITE(SD_MOSI_PIN, HIGH); // Output 1s 1
+      spiRxBlock(buf, nbyte);
+      _SS_WRITE(HIGH);
+    }
+  }
+
+  void spiSend(uint8_t b) {
+    _SS_WRITE(LOW);
+    (void)spiTransferTx(b);
+    _SS_WRITE(HIGH);
+  }
+
+  void spiSendBlock(uint8_t token, const uint8_t *buf) {
+    _SS_WRITE(LOW);
+    (void)spiTransferTx(token);
+    spiTxBlock(buf, 512);
+    _SS_WRITE(HIGH);
+  }
+
+  /**
+   * spiRate should be
+   *  0 :  8 - 10 MHz
+   *  1 :  4 - 5 MHz
+   *  2 :  2 - 2.5 MHz
+   *  3 :  1 - 1.25 MHz
+   *  4 :  500 - 625 kHz
+   *  5 :  250 - 312 kHz
+   *  6 :  125 - 156 kHz
+   */
+  void spiInit(uint8_t spiRate) {
+    switch (spiRate) {
+      case 0:
+        spiTransferTx = (pfnSpiTransfer)spiTransferTx0;
+        spiTransferRx = (pfnSpiTransfer)spiTransferRx0;
+        spiTxBlock = (pfnSpiTxBlock)spiTxBlock0;
+        spiRxBlock = (pfnSpiRxBlock)spiRxBlock0;
+        break;
+      case 1:
+        spiTransferTx = (pfnSpiTransfer)spiTransfer1;
+        spiTransferRx = (pfnSpiTransfer)spiTransfer1;
+        spiTxBlock = (pfnSpiTxBlock)spiTxBlockX;
+        spiRxBlock = (pfnSpiRxBlock)spiRxBlockX;
+        break;
+      default:
+        spiDelayNS = 4000 >> (6 - spiRate); // spiRate of 2 gives the maximum error with current CPU
+        spiTransferTx = (pfnSpiTransfer)spiTransferX;
+        spiTransferRx = (pfnSpiTransfer)spiTransferX;
+        spiTxBlock = (pfnSpiTxBlock)spiTxBlockX;
+        spiRxBlock = (pfnSpiRxBlock)spiRxBlockX;
+        break;
+    }
+
+    _SS_WRITE(HIGH);
+    WRITE(SD_MOSI_PIN, HIGH);
+    WRITE(SD_SCK_PIN, LOW);
+  }
+
+  /** Begin SPI transaction, set clock, bit order, data mode */
+  void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) {
+    // TODO: to be implemented
+  }
+
+  #pragma GCC reset_options
+
+#else // !SOFTWARE_SPI
+
+  #define WHILE_TX(N) while ((SPI0->SPI_SR & SPI_SR_TDRE) == (N))
+  #define WHILE_RX(N) while ((SPI0->SPI_SR & SPI_SR_RDRF) == (N))
+  #define FLUSH_TX() do{ WHILE_RX(1) SPI0->SPI_RDR; }while(0)
+
+  #if MB(ALLIGATOR)
+
+    // slave selects controlled by SPI controller
+    // doesn't support changing SPI speeds for SD card
+
+    // ------------------------
+    // hardware SPI
+    // ------------------------
+    static bool spiInitialized = false;
+
+    void spiInit(uint8_t spiRate) {
+      if (spiInitialized) return;
+
+      // 8.4 MHz, 4 MHz, 2 MHz, 1 MHz, 0.5 MHz, 0.329 MHz, 0.329 MHz
+      constexpr int spiDivider[] = { 10, 21, 42, 84, 168, 255, 255 };
+      if (spiRate > 6) spiRate = 1;
+
+      // Set SPI mode 1, clock, select not active after transfer, with delay between transfers
+      SPI_ConfigureNPCS(SPI0, SPI_CHAN_DAC,
+                        SPI_CSR_CSAAT | SPI_CSR_SCBR(spiDivider[spiRate]) |
+                        SPI_CSR_DLYBCT(1));
+      // Set SPI mode 0, clock, select not active after transfer, with delay between transfers
+      SPI_ConfigureNPCS(SPI0, SPI_CHAN_EEPROM1, SPI_CSR_NCPHA |
+                        SPI_CSR_CSAAT | SPI_CSR_SCBR(spiDivider[spiRate]) |
+                        SPI_CSR_DLYBCT(1));
+
+      // Set SPI mode 0, clock, select not active after transfer, with delay between transfers
+      SPI_ConfigureNPCS(SPI0, SPI_CHAN, SPI_CSR_NCPHA |
+                        SPI_CSR_CSAAT | SPI_CSR_SCBR(spiDivider[spiRate]) |
+                        SPI_CSR_DLYBCT(1));
+      SPI_Enable(SPI0);
+      spiInitialized = true;
+    }
+
+    void spiBegin() {
+      if (spiInitialized) return;
+
+      // Configure SPI pins
+      PIO_Configure(
+         g_APinDescription[SD_SCK_PIN].pPort,
+         g_APinDescription[SD_SCK_PIN].ulPinType,
+         g_APinDescription[SD_SCK_PIN].ulPin,
+         g_APinDescription[SD_SCK_PIN].ulPinConfiguration);
+      PIO_Configure(
+         g_APinDescription[SD_MOSI_PIN].pPort,
+         g_APinDescription[SD_MOSI_PIN].ulPinType,
+         g_APinDescription[SD_MOSI_PIN].ulPin,
+         g_APinDescription[SD_MOSI_PIN].ulPinConfiguration);
+      PIO_Configure(
+         g_APinDescription[SD_MISO_PIN].pPort,
+         g_APinDescription[SD_MISO_PIN].ulPinType,
+         g_APinDescription[SD_MISO_PIN].ulPin,
+         g_APinDescription[SD_MISO_PIN].ulPinConfiguration);
+
+      // set master mode, peripheral select, fault detection
+      SPI_Configure(SPI0, ID_SPI0, SPI_MR_MSTR | SPI_MR_MODFDIS | SPI_MR_PS);
+      SPI_Enable(SPI0);
+
+      SET_OUTPUT(DAC0_SYNC_PIN);
+      #if HAS_MULTI_EXTRUDER
+        OUT_WRITE(DAC1_SYNC_PIN, HIGH);
+      #endif
+      WRITE(DAC0_SYNC_PIN, HIGH);
+      OUT_WRITE(SPI_EEPROM1_CS_PIN, HIGH);
+      OUT_WRITE(SPI_EEPROM2_CS_PIN, HIGH);
+      OUT_WRITE(SPI_FLASH_CS_PIN, HIGH);
+      OUT_WRITE(SD_SS_PIN, HIGH);
+      WRITE(SD_SS_PIN, LOW);
+
+      PIO_Configure(
+        g_APinDescription[SPI_PIN].pPort,
+        g_APinDescription[SPI_PIN].ulPinType,
+        g_APinDescription[SPI_PIN].ulPin,
+        g_APinDescription[SPI_PIN].ulPinConfiguration
+      );
+
+      spiInit(1);
+    }
+
+    // Read single byte from SPI
+    uint8_t spiRec() {
+      // write dummy byte with address and end transmission flag
+      SPI0->SPI_TDR = 0x000000FF | SPI_PCS(SPI_CHAN) | SPI_TDR_LASTXFER;
+
+      WHILE_TX(0);
+      WHILE_RX(0);
+
+      //DELAY_US(1U);
+      return SPI0->SPI_RDR;
+    }
+
+    uint8_t spiRec(uint32_t chan) {
+
+      WHILE_TX(0);
+      FLUSH_RX();
+
+      // write dummy byte with address and end transmission flag
+      SPI0->SPI_TDR = 0x000000FF | SPI_PCS(chan) | SPI_TDR_LASTXFER;
+      WHILE_RX(0);
+
+      return SPI0->SPI_RDR;
+    }
+
+    // Read from SPI into buffer
+    void spiRead(uint8_t *buf, uint16_t nbyte) {
+      if (!nbyte) return;
+      --nbyte;
+      for (int i = 0; i < nbyte; i++) {
+        //WHILE_TX(0);
+        SPI0->SPI_TDR = 0x000000FF | SPI_PCS(SPI_CHAN);
+        WHILE_RX(0);
+        buf[i] = SPI0->SPI_RDR;
+        //DELAY_US(1U);
+      }
+      buf[nbyte] = spiRec();
+    }
+
+    // Write single byte to SPI
+    void spiSend(const byte b) {
+      // write byte with address and end transmission flag
+      SPI0->SPI_TDR = (uint32_t)b | SPI_PCS(SPI_CHAN) | SPI_TDR_LASTXFER;
+      WHILE_TX(0);
+      WHILE_RX(0);
+      SPI0->SPI_RDR;
+      //DELAY_US(1U);
+    }
+
+    void spiSend(const uint8_t *buf, size_t nbyte) {
+      if (!nbyte) return;
+      --nbyte;
+      for (size_t i = 0; i < nbyte; i++) {
+        SPI0->SPI_TDR = (uint32_t)buf[i] | SPI_PCS(SPI_CHAN);
+        WHILE_TX(0);
+        WHILE_RX(0);
+        SPI0->SPI_RDR;
+        //DELAY_US(1U);
+      }
+      spiSend(buf[nbyte]);
+    }
+
+    void spiSend(uint32_t chan, byte b) {
+      WHILE_TX(0);
+      // write byte with address and end transmission flag
+      SPI0->SPI_TDR = (uint32_t)b | SPI_PCS(chan) | SPI_TDR_LASTXFER;
+      WHILE_RX(0);
+      FLUSH_RX();
+    }
+
+    void spiSend(uint32_t chan, const uint8_t *buf, size_t nbyte) {
+      if (!nbyte) return;
+      --nbyte;
+      for (size_t i = 0; i < nbyte; i++) {
+        WHILE_TX(0);
+        SPI0->SPI_TDR = (uint32_t)buf[i] | SPI_PCS(chan);
+        WHILE_RX(0);
+        FLUSH_RX();
+      }
+      spiSend(chan, buf[nbyte]);
+    }
+
+    // Write from buffer to SPI
+    void spiSendBlock(uint8_t token, const uint8_t *buf) {
+      SPI0->SPI_TDR = (uint32_t)token | SPI_PCS(SPI_CHAN);
+      WHILE_TX(0);
+      //WHILE_RX(0);
+      //SPI0->SPI_RDR;
+      for (int i = 0; i < 511; i++) {
+        SPI0->SPI_TDR = (uint32_t)buf[i] | SPI_PCS(SPI_CHAN);
+        WHILE_TX(0);
+        WHILE_RX(0);
+        SPI0->SPI_RDR;
+        //DELAY_US(1U);
+      }
+      spiSend(buf[511]);
+    }
+
+    /** Begin SPI transaction, set clock, bit order, data mode */
+    void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) {
+      // TODO: to be implemented
+    }
+
+  #else // U8G compatible hardware SPI
+
+    #define SPI_MODE_0_DUE_HW 2  // DUE CPHA control bit is inverted
+    #define SPI_MODE_1_DUE_HW 3
+    #define SPI_MODE_2_DUE_HW 0
+    #define SPI_MODE_3_DUE_HW 1
+
+    /**
+     *  The DUE SPI controller is set up so the upper word of the longword
+     *  written to the transmit data register selects which SPI Chip Select
+     *  Register is used. This allows different streams to have different SPI
+     *  settings.
+     *
+     *  In practice it's spooky. Some combinations hang the system, while others
+     *  upset the peripheral device.
+     *
+     *  SPI mode should be the same for all streams. The FYSETC_MINI_12864 gets
+     *  upset if the clock phase changes after chip select goes active.
+     *
+     *  SPI_CSR_CSAAT should be set for all streams. If not the WHILE_TX(0)
+     *  macro returns immediately which can result in the SPI chip select going
+     *  inactive before all the data has been sent.
+     *
+     *  The TMC2130 library uses SPI0->SPI_CSR[3].
+     *
+     *  The U8G hardware SPI uses SPI0->SPI_CSR[0]. The system hangs and/or the
+     *  FYSETC_MINI_12864 gets upset if lower baud rates are used and the SD card
+     *  is inserted or removed.
+     *
+     *  The SD card uses SPI0->SPI_CSR[3]. Efforts were made to use [1] and [2]
+     *  but they all resulted in hangs or garbage on the LCD.
+     *
+     *  The SPI controlled chip selects are NOT enabled in the GPIO controller.
+     *  The application must control the chip select.
+     *
+     *  All of the above can be avoided by defining FORCE_SOFT_SPI to force the
+     *  display to use software SPI.
+     */
+
+    void spiInit(uint8_t spiRate=6) {  // Default to slowest rate if not specified)
+                                       // Also sets U8G SPI rate to 4MHz and the SPI mode to 3
+
+      // 8.4 MHz, 4 MHz, 2 MHz, 1 MHz, 0.5 MHz, 0.329 MHz, 0.329 MHz
+      constexpr int spiDivider[] = { 10, 21, 42, 84, 168, 255, 255 };
+      if (spiRate > 6) spiRate = 1;
+
+      // Enable PIOA and SPI0
+      REG_PMC_PCER0 = (1UL << ID_PIOA) | (1UL << ID_SPI0);
+
+      // Disable PIO on A26 and A27
+      REG_PIOA_PDR = 0x0C000000;
+      OUT_WRITE(SD_SS_PIN, HIGH);
+
+      // Reset SPI0 (from sam lib)
+      SPI0->SPI_CR = SPI_CR_SPIDIS;
+      SPI0->SPI_CR = SPI_CR_SWRST;
+      SPI0->SPI_CR = SPI_CR_SWRST;
+      SPI0->SPI_CR = SPI_CR_SPIEN;
+
+      // TMC2103 compatible setup
+      // Master mode, no fault detection, PCS bits in data written to TDR select CSR register
+      SPI0->SPI_MR = SPI_MR_MSTR | SPI_MR_PS | SPI_MR_MODFDIS;
+      // SPI mode 3, 8 Bit data transfer, baud rate
+      SPI0->SPI_CSR[3] = SPI_CSR_SCBR(spiDivider[spiRate]) | SPI_CSR_CSAAT | SPI_MODE_3_DUE_HW;  // use same CSR as TMC2130
+      SPI0->SPI_CSR[0] = SPI_CSR_SCBR(spiDivider[1]) | SPI_CSR_CSAAT | SPI_MODE_3_DUE_HW;  // U8G default to 4MHz
+    }
+
+    void spiBegin() { spiInit(); }
+
+    static uint8_t spiTransfer(uint8_t data) {
+      WHILE_TX(0);
+      SPI0->SPI_TDR = (uint32_t)data | 0x00070000UL;  // Add TMC2130 PCS bits to every byte (use SPI0->SPI_CSR[3])
+      WHILE_TX(0);
+      WHILE_RX(0);
+      return SPI0->SPI_RDR;
+    }
+
+    uint8_t spiRec() { return (uint8_t)spiTransfer(0xFF); }
+
+    void spiRead(uint8_t *buf, uint16_t nbyte) {
+      for (int i = 0; i < nbyte; i++)
+        buf[i] = spiTransfer(0xFF);
+    }
+
+    void spiSend(uint8_t data) { spiTransfer(data); }
+
+    void spiSend(const uint8_t *buf, size_t nbyte) {
+      for (uint16_t i = 0; i < nbyte; i++)
+        spiTransfer(buf[i]);
+    }
+
+    void spiSendBlock(uint8_t token, const uint8_t *buf) {
+      spiTransfer(token);
+      for (uint16_t i = 0; i < 512; i++)
+        spiTransfer(buf[i]);
+    }
+
+  #endif // !ALLIGATOR
+#endif // !SOFTWARE_SPI
+
+#endif // ARDUINO_ARCH_SAM

Marlin/src/HAL/DUE/InterruptVectors.cpp

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 
@@ -41,7 +41,7 @@
    practice, we need alignment to 256 bytes to make this work in all
    cases */
 __attribute__ ((aligned(256)))
-static DeviceVectors ram_tab = { nullptr };
+static DeviceVectors ram_tab[61] = { nullptr };
 
 /**
  * This function checks if the exception/interrupt table is already in SRAM or not.

Marlin/src/HAL/DUE/InterruptVectors.h

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 #pragma once

Marlin/src/HAL/DUE/MarlinSPI.h

@@ -0,0 +1,26 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include <SPI.h>
+
+using MarlinSPI = SPIClass;

Marlin/src/HAL/DUE/MarlinSerial.cpp

@@ -0,0 +1,492 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * MarlinSerial_Due.cpp - Hardware serial library for Arduino DUE
+ * Copyright (c) 2017 Eduardo José Tagle. All right reserved
+ * Based on MarlinSerial for AVR, copyright (c) 2006 Nicholas Zambetti.  All right reserved.
+ */
+#ifdef ARDUINO_ARCH_SAM
+
+#include "../../inc/MarlinConfig.h"
+
+#include "MarlinSerial.h"
+#include "InterruptVectors.h"
+
+template<typename Cfg> typename MarlinSerial<Cfg>::ring_buffer_r MarlinSerial<Cfg>::rx_buffer = { 0, 0, { 0 } };
+template<typename Cfg> typename MarlinSerial<Cfg>::ring_buffer_t MarlinSerial<Cfg>::tx_buffer = { 0 };
+template<typename Cfg> bool     MarlinSerial<Cfg>::_written = false;
+template<typename Cfg> uint8_t  MarlinSerial<Cfg>::xon_xoff_state = MarlinSerial<Cfg>::XON_XOFF_CHAR_SENT | MarlinSerial<Cfg>::XON_CHAR;
+template<typename Cfg> uint8_t  MarlinSerial<Cfg>::rx_dropped_bytes = 0;
+template<typename Cfg> uint8_t  MarlinSerial<Cfg>::rx_buffer_overruns = 0;
+template<typename Cfg> uint8_t  MarlinSerial<Cfg>::rx_framing_errors = 0;
+template<typename Cfg> typename MarlinSerial<Cfg>::ring_buffer_pos_t MarlinSerial<Cfg>::rx_max_enqueued = 0;
+
+// A SW memory barrier, to ensure GCC does not overoptimize loops
+#define sw_barrier() asm volatile("": : :"memory");
+
+#include "../../feature/e_parser.h"
+
+// (called with RX interrupts disabled)
+template<typename Cfg>
+FORCE_INLINE void MarlinSerial<Cfg>::store_rxd_char() {
+
+  static EmergencyParser::State emergency_state; // = EP_RESET
+
+  // Get the tail - Nothing can alter its value while we are at this ISR
+  const ring_buffer_pos_t t = rx_buffer.tail;
+
+  // Get the head pointer
+  ring_buffer_pos_t h = rx_buffer.head;
+
+  // Get the next element
+  ring_buffer_pos_t i = (ring_buffer_pos_t)(h + 1) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+
+  // Read the character from the USART
+  uint8_t c = HWUART->UART_RHR;
+
+  if (Cfg::EMERGENCYPARSER) emergency_parser.update(emergency_state, c);
+
+  // If the character is to be stored at the index just before the tail
+  // (such that the head would advance to the current tail), the RX FIFO is
+  // full, so don't write the character or advance the head.
+  if (i != t) {
+    rx_buffer.buffer[h] = c;
+    h = i;
+  }
+  else if (Cfg::DROPPED_RX && !++rx_dropped_bytes)
+    --rx_dropped_bytes;
+
+  const ring_buffer_pos_t rx_count = (ring_buffer_pos_t)(h - t) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+  // Calculate count of bytes stored into the RX buffer
+
+  // Keep track of the maximum count of enqueued bytes
+  if (Cfg::MAX_RX_QUEUED) NOLESS(rx_max_enqueued, rx_count);
+
+  if (Cfg::XONOFF) {
+    // If the last char that was sent was an XON
+    if ((xon_xoff_state & XON_XOFF_CHAR_MASK) == XON_CHAR) {
+
+      // Bytes stored into the RX buffer
+      const ring_buffer_pos_t rx_count = (ring_buffer_pos_t)(h - t) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+
+      // If over 12.5% of RX buffer capacity, send XOFF before running out of
+      // RX buffer space .. 325 bytes @ 250kbits/s needed to let the host react
+      // and stop sending bytes. This translates to 13mS propagation time.
+      if (rx_count >= (Cfg::RX_SIZE) / 8) {
+
+        // At this point, definitely no TX interrupt was executing, since the TX isr can't be preempted.
+        // Don't enable the TX interrupt here as a means to trigger the XOFF char, because if it happens
+        // to be in the middle of trying to disable the RX interrupt in the main program, eventually the
+        // enabling of the TX interrupt could be undone. The ONLY reliable thing this can do to ensure
+        // the sending of the XOFF char is to send it HERE AND NOW.
+
+        // About to send the XOFF char
+        xon_xoff_state = XOFF_CHAR | XON_XOFF_CHAR_SENT;
+
+        // Wait until the TX register becomes empty and send it - Here there could be a problem
+        // - While waiting for the TX register to empty, the RX register could receive a new
+        //   character. This must also handle that situation!
+        uint32_t status;
+        while (!((status = HWUART->UART_SR) & UART_SR_TXRDY)) {
+
+          if (status & UART_SR_RXRDY) {
+            // We received a char while waiting for the TX buffer to be empty - Receive and process it!
+
+            i = (ring_buffer_pos_t)(h + 1) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+
+            // Read the character from the USART
+            c = HWUART->UART_RHR;
+
+            if (Cfg::EMERGENCYPARSER) emergency_parser.update(emergency_state, c);
+
+            // If the character is to be stored at the index just before the tail
+            // (such that the head would advance to the current tail), the FIFO is
+            // full, so don't write the character or advance the head.
+            if (i != t) {
+              rx_buffer.buffer[h] = c;
+              h = i;
+            }
+            else if (Cfg::DROPPED_RX && !++rx_dropped_bytes)
+              --rx_dropped_bytes;
+          }
+          sw_barrier();
+        }
+
+        HWUART->UART_THR = XOFF_CHAR;
+
+        // At this point there could be a race condition between the write() function
+        // and this sending of the XOFF char. This interrupt could happen between the
+        // wait to be empty TX buffer loop and the actual write of the character. Since
+        // the TX buffer is full because it's sending the XOFF char, the only way to be
+        // sure the write() function will succeed is to wait for the XOFF char to be
+        // completely sent. Since an extra character could be received during the wait
+        // it must also be handled!
+        while (!((status = HWUART->UART_SR) & UART_SR_TXRDY)) {
+
+          if (status & UART_SR_RXRDY) {
+            // A char arrived while waiting for the TX buffer to be empty - Receive and process it!
+
+            i = (ring_buffer_pos_t)(h + 1) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+
+            // Read the character from the USART
+            c = HWUART->UART_RHR;
+
+            if (Cfg::EMERGENCYPARSER) emergency_parser.update(emergency_state, c);
+
+            // If the character is to be stored at the index just before the tail
+            // (such that the head would advance to the current tail), the FIFO is
+            // full, so don't write the character or advance the head.
+            if (i != t) {
+              rx_buffer.buffer[h] = c;
+              h = i;
+            }
+            else if (Cfg::DROPPED_RX && !++rx_dropped_bytes)
+              --rx_dropped_bytes;
+          }
+          sw_barrier();
+        }
+
+        // At this point everything is ready. The write() function won't
+        // have any issues writing to the UART TX register if it needs to!
+      }
+    }
+  }
+
+  // Store the new head value
+  rx_buffer.head = h;
+}
+
+template<typename Cfg>
+FORCE_INLINE void MarlinSerial<Cfg>::_tx_thr_empty_irq() {
+  if (Cfg::TX_SIZE > 0) {
+    // Read positions
+    uint8_t t = tx_buffer.tail;
+    const uint8_t h = tx_buffer.head;
+
+    if (Cfg::XONOFF) {
+      // If an XON char is pending to be sent, do it now
+      if (xon_xoff_state == XON_CHAR) {
+
+        // Send the character
+        HWUART->UART_THR = XON_CHAR;
+
+        // Remember we sent it.
+        xon_xoff_state = XON_CHAR | XON_XOFF_CHAR_SENT;
+
+        // If nothing else to transmit, just disable TX interrupts.
+        if (h == t) HWUART->UART_IDR = UART_IDR_TXRDY;
+
+        return;
+      }
+    }
+
+    // If nothing to transmit, just disable TX interrupts. This could
+    // happen as the result of the non atomicity of the disabling of RX
+    // interrupts that could end reenabling TX interrupts as a side effect.
+    if (h == t) {
+      HWUART->UART_IDR = UART_IDR_TXRDY;
+      return;
+    }
+
+    // There is something to TX, Send the next byte
+    const uint8_t c = tx_buffer.buffer[t];
+    t = (t + 1) & (Cfg::TX_SIZE - 1);
+    HWUART->UART_THR = c;
+    tx_buffer.tail = t;
+
+    // Disable interrupts if there is nothing to transmit following this byte
+    if (h == t) HWUART->UART_IDR = UART_IDR_TXRDY;
+  }
+}
+
+template<typename Cfg>
+void MarlinSerial<Cfg>::UART_ISR() {
+  const uint32_t status = HWUART->UART_SR;
+
+  // Data received?
+  if (status & UART_SR_RXRDY) store_rxd_char();
+
+  if (Cfg::TX_SIZE > 0) {
+    // Something to send, and TX interrupts are enabled (meaning something to send)?
+    if ((status & UART_SR_TXRDY) && (HWUART->UART_IMR & UART_IMR_TXRDY)) _tx_thr_empty_irq();
+  }
+
+  // Acknowledge errors
+  if ((status & UART_SR_OVRE) || (status & UART_SR_FRAME)) {
+    if (Cfg::DROPPED_RX && (status & UART_SR_OVRE) && !++rx_dropped_bytes) --rx_dropped_bytes;
+    if (Cfg::RX_OVERRUNS && (status & UART_SR_OVRE) && !++rx_buffer_overruns) --rx_buffer_overruns;
+    if (Cfg::RX_FRAMING_ERRORS && (status & UART_SR_FRAME) && !++rx_framing_errors) --rx_framing_errors;
+
+    // TODO: error reporting outside ISR
+    HWUART->UART_CR = UART_CR_RSTSTA;
+  }
+}
+
+// Public Methods
+template<typename Cfg>
+void MarlinSerial<Cfg>::begin(const long baud_setting) {
+
+  // Disable UART interrupt in NVIC
+  NVIC_DisableIRQ( HWUART_IRQ );
+
+  // We NEED memory barriers to ensure Interrupts are actually disabled!
+  // ( https://dzone.com/articles/nvic-disabling-interrupts-on-arm-cortex-m-and-the )
+  __DSB();
+  __ISB();
+
+  // Disable clock
+  pmc_disable_periph_clk( HWUART_IRQ_ID );
+
+  // Configure PMC
+  pmc_enable_periph_clk( HWUART_IRQ_ID );
+
+  // Disable PDC channel
+  HWUART->UART_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS;
+
+  // Reset and disable receiver and transmitter
+  HWUART->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX | UART_CR_RXDIS | UART_CR_TXDIS;
+
+  // Configure mode: 8bit, No parity, 1 bit stop
+  HWUART->UART_MR = UART_MR_CHMODE_NORMAL | US_MR_CHRL_8_BIT | US_MR_NBSTOP_1_BIT | UART_MR_PAR_NO;
+
+  // Configure baudrate (asynchronous, no oversampling)
+  HWUART->UART_BRGR = (SystemCoreClock / (baud_setting << 4));
+
+  // Configure interrupts
+  HWUART->UART_IDR = 0xFFFFFFFF;
+  HWUART->UART_IER = UART_IER_RXRDY | UART_IER_OVRE | UART_IER_FRAME;
+
+  // Install interrupt handler
+  install_isr(HWUART_IRQ, UART_ISR);
+
+  // Configure priority. We need a very high priority to avoid losing characters
+  // and we need to be able to preempt the Stepper ISR and everything else!
+  // (this could probably be fixed by using DMA with the Serial port)
+  NVIC_SetPriority(HWUART_IRQ, 1);
+
+  // Enable UART interrupt in NVIC
+  NVIC_EnableIRQ(HWUART_IRQ);
+
+  // Enable receiver and transmitter
+  HWUART->UART_CR = UART_CR_RXEN | UART_CR_TXEN;
+
+  if (Cfg::TX_SIZE > 0) _written = false;
+}
+
+template<typename Cfg>
+void MarlinSerial<Cfg>::end() {
+  // Disable UART interrupt in NVIC
+  NVIC_DisableIRQ( HWUART_IRQ );
+
+  // We NEED memory barriers to ensure Interrupts are actually disabled!
+  // ( https://dzone.com/articles/nvic-disabling-interrupts-on-arm-cortex-m-and-the )
+  __DSB();
+  __ISB();
+
+  pmc_disable_periph_clk( HWUART_IRQ_ID );
+}
+
+template<typename Cfg>
+int MarlinSerial<Cfg>::peek() {
+  const int v = rx_buffer.head == rx_buffer.tail ? -1 : rx_buffer.buffer[rx_buffer.tail];
+  return v;
+}
+
+template<typename Cfg>
+int MarlinSerial<Cfg>::read() {
+
+  const ring_buffer_pos_t h = rx_buffer.head;
+  ring_buffer_pos_t t = rx_buffer.tail;
+
+  if (h == t) return -1;
+
+  int v = rx_buffer.buffer[t];
+  t = (ring_buffer_pos_t)(t + 1) & (Cfg::RX_SIZE - 1);
+
+  // Advance tail
+  rx_buffer.tail = t;
+
+  if (Cfg::XONOFF) {
+    // If the XOFF char was sent, or about to be sent...
+    if ((xon_xoff_state & XON_XOFF_CHAR_MASK) == XOFF_CHAR) {
+      // Get count of bytes in the RX buffer
+      const ring_buffer_pos_t rx_count = (ring_buffer_pos_t)(h - t) & (ring_buffer_pos_t)(Cfg::RX_SIZE - 1);
+      // When below 10% of RX buffer capacity, send XON before running out of RX buffer bytes
+      if (rx_count < (Cfg::RX_SIZE) / 10) {
+        if (Cfg::TX_SIZE > 0) {
+          // Signal we want an XON character to be sent.
+          xon_xoff_state = XON_CHAR;
+          // Enable TX isr.
+          HWUART->UART_IER = UART_IER_TXRDY;
+        }
+        else {
+          // If not using TX interrupts, we must send the XON char now
+          xon_xoff_state = XON_CHAR | XON_XOFF_CHAR_SENT;
+          while (!(HWUART->UART_SR & UART_SR_TXRDY)) sw_barrier();
+          HWUART->UART_THR = XON_CHAR;
+        }
+      }
+    }
+  }
+
+  return v;
+}
+
+template<typename Cfg>
+typename MarlinSerial<Cfg>::ring_buffer_pos_t MarlinSerial<Cfg>::available() {
+  const ring_buffer_pos_t h = rx_buffer.head, t = rx_buffer.tail;
+  return (ring_buffer_pos_t)(Cfg::RX_SIZE + h - t) & (Cfg::RX_SIZE - 1);
+}
+
+template<typename Cfg>
+void MarlinSerial<Cfg>::flush() {
+  rx_buffer.tail = rx_buffer.head;
+
+  if (Cfg::XONOFF) {
+    if ((xon_xoff_state & XON_XOFF_CHAR_MASK) == XOFF_CHAR) {
+      if (Cfg::TX_SIZE > 0) {
+        // Signal we want an XON character to be sent.
+        xon_xoff_state = XON_CHAR;
+        // Enable TX isr.
+        HWUART->UART_IER = UART_IER_TXRDY;
+      }
+      else {
+        // If not using TX interrupts, we must send the XON char now
+        xon_xoff_state = XON_CHAR | XON_XOFF_CHAR_SENT;
+        while (!(HWUART->UART_SR & UART_SR_TXRDY)) sw_barrier();
+        HWUART->UART_THR = XON_CHAR;
+      }
+    }
+  }
+}
+
+template<typename Cfg>
+size_t MarlinSerial<Cfg>::write(const uint8_t c) {
+  _written = true;
+
+  if (Cfg::TX_SIZE == 0) {
+    while (!(HWUART->UART_SR & UART_SR_TXRDY)) sw_barrier();
+    HWUART->UART_THR = c;
+  }
+  else {
+
+    // If the TX interrupts are disabled and the data register
+    // is empty, just write the byte to the data register and
+    // be done. This shortcut helps significantly improve the
+    // effective datarate at high (>500kbit/s) bitrates, where
+    // interrupt overhead becomes a slowdown.
+    // Yes, there is a race condition between the sending of the
+    // XOFF char at the RX isr, but it is properly handled there
+    if (!(HWUART->UART_IMR & UART_IMR_TXRDY) && (HWUART->UART_SR & UART_SR_TXRDY)) {
+      HWUART->UART_THR = c;
+      return 1;
+    }
+
+    const uint8_t i = (tx_buffer.head + 1) & (Cfg::TX_SIZE - 1);
+
+    // If global interrupts are disabled (as the result of being called from an ISR)...
+    if (!hal.isr_state()) {
+
+      // Make room by polling if it is possible to transmit, and do so!
+      while (i == tx_buffer.tail) {
+        // If we can transmit another byte, do it.
+        if (HWUART->UART_SR & UART_SR_TXRDY) _tx_thr_empty_irq();
+        // Make sure compiler rereads tx_buffer.tail
+        sw_barrier();
+      }
+    }
+    else {
+      // Interrupts are enabled, just wait until there is space
+      while (i == tx_buffer.tail) sw_barrier();
+    }
+
+    // Store new char. head is always safe to move
+    tx_buffer.buffer[tx_buffer.head] = c;
+    tx_buffer.head = i;
+
+    // Enable TX isr - Non atomic, but it will eventually enable TX isr
+    HWUART->UART_IER = UART_IER_TXRDY;
+  }
+  return 1;
+}
+
+template<typename Cfg>
+void MarlinSerial<Cfg>::flushTX() {
+  // TX
+
+  if (Cfg::TX_SIZE == 0) {
+    // No bytes written, no need to flush. This special case is needed since there's
+    // no way to force the TXC (transmit complete) bit to 1 during initialization.
+    if (!_written) return;
+
+    // Wait until everything was transmitted
+    while (!(HWUART->UART_SR & UART_SR_TXEMPTY)) sw_barrier();
+
+    // At this point nothing is queued anymore (DRIE is disabled) and
+    // the hardware finished transmission (TXC is set).
+
+  }
+  else {
+    // If we have never written a byte, no need to flush. This special
+    // case is needed since there is no way to force the TXC (transmit
+    // complete) bit to 1 during initialization
+    if (!_written) return;
+
+    // If global interrupts are disabled (as the result of being called from an ISR)...
+    if (!hal.isr_state()) {
+
+      // Wait until everything was transmitted - We must do polling, as interrupts are disabled
+      while (tx_buffer.head != tx_buffer.tail || !(HWUART->UART_SR & UART_SR_TXEMPTY)) {
+        // If there is more space, send an extra character
+        if (HWUART->UART_SR & UART_SR_TXRDY) _tx_thr_empty_irq();
+        sw_barrier();
+      }
+
+    }
+    else {
+      // Wait until everything was transmitted
+      while (tx_buffer.head != tx_buffer.tail || !(HWUART->UART_SR & UART_SR_TXEMPTY)) sw_barrier();
+    }
+
+    // At this point nothing is queued anymore (DRIE is disabled) and
+    // the hardware finished transmission (TXC is set).
+  }
+}
+
+// If not using the USB port as serial port
+#if defined(SERIAL_PORT) && SERIAL_PORT >= 0
+  template class MarlinSerial< MarlinSerialCfg<SERIAL_PORT> >;
+  MSerialT1 customizedSerial1(MarlinSerialCfg<SERIAL_PORT>::EMERGENCYPARSER);
+#endif
+
+#if defined(SERIAL_PORT_2) && SERIAL_PORT_2 >= 0
+  template class MarlinSerial< MarlinSerialCfg<SERIAL_PORT_2> >;
+  MSerialT2 customizedSerial2(MarlinSerialCfg<SERIAL_PORT_2>::EMERGENCYPARSER);
+#endif
+
+#if defined(SERIAL_PORT_3) && SERIAL_PORT_3 >= 0
+  template class MarlinSerial< MarlinSerialCfg<SERIAL_PORT_3> >;
+  MSerialT3 customizedSerial3(MarlinSerialCfg<SERIAL_PORT_3>::EMERGENCYPARSER);
+#endif
+
+#endif // ARDUINO_ARCH_SAM

Marlin/src/HAL/DUE/MarlinSerial.h

@@ -0,0 +1,168 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * MarlinSerial_Due.h - Hardware serial library for Arduino DUE
+ * Copyright (c) 2017 Eduardo José Tagle. All right reserved
+ * Based on MarlinSerial for AVR, copyright (c) 2006 Nicholas Zambetti.  All right reserved.
+ */
+
+#include <WString.h>
+
+#include "../../inc/MarlinConfigPre.h"
+#include "../../core/types.h"
+#include "../../core/serial_hook.h"
+
+typedef ForwardSerial1Class< decltype(Serial) > DefaultSerial1;
+typedef ForwardSerial1Class< decltype(Serial1) > DefaultSerial2;
+typedef ForwardSerial1Class< decltype(Serial2) > DefaultSerial3;
+typedef ForwardSerial1Class< decltype(Serial3) > DefaultSerial4;
+extern DefaultSerial1 MSerial0;
+extern DefaultSerial2 MSerial1;
+extern DefaultSerial3 MSerial2;
+extern DefaultSerial4 MSerial3;
+
+#define SERIAL_INDEX_MIN 0
+#define SERIAL_INDEX_MAX 3
+#define EP_SERIAL_PORT(N) customizedSerial##N
+#define USB_SERIAL_PORT(N) customizedSerial##N
+#include "../shared/serial_ports.h"
+
+// Define constants and variables for buffering incoming serial data.  We're
+// using a ring buffer (I think), in which rx_buffer_head is the index of the
+// location to which to write the next incoming character and rx_buffer_tail
+// is the index of the location from which to read.
+// 256 is the max limit due to uint8_t head and tail. Use only powers of 2. (...,16,32,64,128,256)
+#ifndef RX_BUFFER_SIZE
+  #define RX_BUFFER_SIZE 128
+#endif
+#ifndef TX_BUFFER_SIZE
+  #define TX_BUFFER_SIZE 32
+#endif
+
+//#if ENABLED(SERIAL_XON_XOFF) && RX_BUFFER_SIZE < 1024
+//  #error "SERIAL_XON_XOFF requires RX_BUFFER_SIZE >= 1024 for reliable transfers without drops."
+//#elif RX_BUFFER_SIZE && (RX_BUFFER_SIZE < 2 || !IS_POWER_OF_2(RX_BUFFER_SIZE))
+//  #error "RX_BUFFER_SIZE must be a power of 2 greater than 1."
+//#elif TX_BUFFER_SIZE && (TX_BUFFER_SIZE < 2 || TX_BUFFER_SIZE > 256 || !IS_POWER_OF_2(TX_BUFFER_SIZE))
+//  #error "TX_BUFFER_SIZE must be 0, a power of 2 greater than 1, and no greater than 256."
+//#endif
+
+// Templated structure wrapper
+template<typename S, unsigned int addr> struct StructWrapper {
+  constexpr StructWrapper(int) {}
+  FORCE_INLINE S* operator->() const { return (S*)addr; }
+};
+
+template<typename Cfg>
+class MarlinSerial {
+protected:
+  // Information for all supported UARTs
+  static constexpr uint32_t BASES[] = {0x400E0800U, 0x40098000U, 0x4009C000U, 0x400A0000U, 0x400A4000U};
+  static constexpr IRQn_Type IRQS[] = {  UART_IRQn, USART0_IRQn, USART1_IRQn, USART2_IRQn, USART3_IRQn};
+  static constexpr int    IRQ_IDS[] = {    ID_UART,   ID_USART0,   ID_USART1,   ID_USART2,   ID_USART3};
+
+  // Alias for shorter code
+  static constexpr StructWrapper<Uart,BASES[Cfg::PORT]> HWUART = 0;
+  static constexpr IRQn_Type HWUART_IRQ = IRQS[Cfg::PORT];
+  static constexpr int HWUART_IRQ_ID = IRQ_IDS[Cfg::PORT];
+
+  // Base size of type on buffer size
+  typedef uvalue_t(Cfg::RX_SIZE - 1) ring_buffer_pos_t;
+
+  struct ring_buffer_r {
+    volatile ring_buffer_pos_t head, tail;
+    unsigned char buffer[Cfg::RX_SIZE];
+  };
+
+  struct ring_buffer_t {
+    volatile uint8_t head, tail;
+    unsigned char buffer[Cfg::TX_SIZE];
+  };
+
+  static ring_buffer_r rx_buffer;
+  static ring_buffer_t tx_buffer;
+  static bool _written;
+
+  static constexpr uint8_t XON_XOFF_CHAR_SENT = 0x80,  // XON / XOFF Character was sent
+                           XON_XOFF_CHAR_MASK = 0x1F;  // XON / XOFF character to send
+
+  // XON / XOFF character definitions
+  static constexpr uint8_t XON_CHAR  = 17, XOFF_CHAR = 19;
+  static uint8_t xon_xoff_state,
+                 rx_dropped_bytes,
+                 rx_buffer_overruns,
+                 rx_framing_errors;
+  static ring_buffer_pos_t rx_max_enqueued;
+
+  FORCE_INLINE static void store_rxd_char();
+  FORCE_INLINE static void _tx_thr_empty_irq();
+  static void UART_ISR();
+
+public:
+  MarlinSerial() {};
+  static void begin(const long);
+  static void end();
+  static int peek();
+  static int read();
+  static void flush();
+  static ring_buffer_pos_t available();
+  static size_t write(const uint8_t c);
+  static void flushTX();
+
+  static bool emergency_parser_enabled() { return Cfg::EMERGENCYPARSER; }
+
+  FORCE_INLINE static uint8_t dropped() { return Cfg::DROPPED_RX ? rx_dropped_bytes : 0; }
+  FORCE_INLINE static uint8_t buffer_overruns() { return Cfg::RX_OVERRUNS ? rx_buffer_overruns : 0; }
+  FORCE_INLINE static uint8_t framing_errors() { return Cfg::RX_FRAMING_ERRORS ? rx_framing_errors : 0; }
+  FORCE_INLINE static ring_buffer_pos_t rxMaxEnqueued() { return Cfg::MAX_RX_QUEUED ? rx_max_enqueued : 0; }
+};
+
+// Serial port configuration
+template <uint8_t serial>
+struct MarlinSerialCfg {
+  static constexpr int PORT               = serial;
+  static constexpr unsigned int RX_SIZE   = RX_BUFFER_SIZE;
+  static constexpr unsigned int TX_SIZE   = TX_BUFFER_SIZE;
+  static constexpr bool XONOFF            = ENABLED(SERIAL_XON_XOFF);
+  static constexpr bool EMERGENCYPARSER   = ENABLED(EMERGENCY_PARSER);
+  static constexpr bool DROPPED_RX        = ENABLED(SERIAL_STATS_DROPPED_RX);
+  static constexpr bool RX_OVERRUNS       = ENABLED(SERIAL_STATS_RX_BUFFER_OVERRUNS);
+  static constexpr bool RX_FRAMING_ERRORS = ENABLED(SERIAL_STATS_RX_FRAMING_ERRORS);
+  static constexpr bool MAX_RX_QUEUED     = ENABLED(SERIAL_STATS_MAX_RX_QUEUED);
+};
+
+#if defined(SERIAL_PORT) && SERIAL_PORT >= 0
+  typedef Serial1Class< MarlinSerial< MarlinSerialCfg<SERIAL_PORT> > > MSerialT1;
+  extern MSerialT1 customizedSerial1;
+#endif
+
+#if defined(SERIAL_PORT_2) && SERIAL_PORT_2 >= 0
+  typedef Serial1Class< MarlinSerial< MarlinSerialCfg<SERIAL_PORT_2> > > MSerialT2;
+  extern MSerialT2 customizedSerial2;
+#endif
+
+#if defined(SERIAL_PORT_3) && SERIAL_PORT_3 >= 0
+  typedef Serial1Class< MarlinSerial< MarlinSerialCfg<SERIAL_PORT_3> > > MSerialT3;
+  extern MSerialT3 customizedSerial3;
+#endif

Marlin/src/HAL/DUE/MarlinSerialUSB.cpp

@@ -0,0 +1,142 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#ifdef ARDUINO_ARCH_SAM
+
+/**
+ * MarlinSerial_Due.cpp - Hardware serial library for Arduino DUE
+ * Copyright (c) 2017 Eduardo José Tagle. All right reserved
+ * Based on MarlinSerial for AVR, copyright (c) 2006 Nicholas Zambetti.  All right reserved.
+ */
+
+#include "../../inc/MarlinConfig.h"
+
+#if HAS_USB_SERIAL
+
+#include "MarlinSerialUSB.h"
+
+// Imports from Atmel USB Stack/CDC implementation
+extern "C" {
+  bool usb_task_cdc_isenabled();
+  bool usb_task_cdc_dtr_active();
+  bool udi_cdc_is_rx_ready();
+  int udi_cdc_getc();
+  bool udi_cdc_is_tx_ready();
+  int udi_cdc_putc(int value);
+}
+
+// Pending character
+static int pending_char = -1;
+
+// Public Methods
+void MarlinSerialUSB::begin(const long) {}
+
+void MarlinSerialUSB::end() {}
+
+int MarlinSerialUSB::peek() {
+  if (pending_char >= 0)
+    return pending_char;
+
+  // If USB CDC not enumerated or not configured on the PC side
+  if (!usb_task_cdc_isenabled())
+    return -1;
+
+  // If no bytes sent from the PC
+  if (!udi_cdc_is_rx_ready())
+    return -1;
+
+  pending_char = udi_cdc_getc();
+
+  TERN_(EMERGENCY_PARSER, emergency_parser.update(static_cast<MSerialT1*>(this)->emergency_state, (char)pending_char));
+
+  return pending_char;
+}
+
+int MarlinSerialUSB::read() {
+  if (pending_char >= 0) {
+    int ret = pending_char;
+    pending_char = -1;
+    return ret;
+  }
+
+  // If USB CDC not enumerated or not configured on the PC side
+  if (!usb_task_cdc_isenabled())
+    return -1;
+
+  // If no bytes sent from the PC
+  if (!udi_cdc_is_rx_ready())
+    return -1;
+
+  int c = udi_cdc_getc();
+
+  TERN_(EMERGENCY_PARSER, emergency_parser.update(static_cast<MSerialT1*>(this)->emergency_state, (char)c));
+
+  return c;
+}
+
+int MarlinSerialUSB::available() {
+  if (pending_char > 0) return pending_char;
+  return pending_char == 0 ||
+    // or USB CDC enumerated and configured on the PC side and some bytes where sent to us */
+    (usb_task_cdc_isenabled() && udi_cdc_is_rx_ready());
+}
+
+void MarlinSerialUSB::flush() { }
+
+size_t MarlinSerialUSB::write(const uint8_t c) {
+
+  /* Do not even bother sending anything if USB CDC is not enumerated
+     or not configured on the PC side or there is no program on the PC
+     listening to our messages */
+  if (!usb_task_cdc_isenabled() || !usb_task_cdc_dtr_active())
+    return 0;
+
+  /* Wait until the PC has read the pending to be sent data */
+  while (usb_task_cdc_isenabled() &&
+         usb_task_cdc_dtr_active() &&
+        !udi_cdc_is_tx_ready()) {
+  };
+
+  /* Do not even bother sending anything if USB CDC is not enumerated
+     or not configured on the PC side or there is no program on the PC
+     listening to our messages at this point */
+  if (!usb_task_cdc_isenabled() || !usb_task_cdc_dtr_active())
+    return 0;
+
+  // Fifo full
+  //  udi_cdc_signal_overrun();
+  udi_cdc_putc(c);
+  return 1;
+}
+
+// Preinstantiate
+#if SERIAL_PORT == -1
+  MSerialT1 customizedSerial1(TERN0(EMERGENCY_PARSER, true));
+#endif
+#if SERIAL_PORT_2 == -1
+  MSerialT2 customizedSerial2(TERN0(EMERGENCY_PARSER, true));
+#endif
+#if SERIAL_PORT_3 == -1
+  MSerialT3 customizedSerial3(TERN0(EMERGENCY_PARSER, true));
+#endif
+
+#endif // HAS_USB_SERIAL
+#endif // ARDUINO_ARCH_SAM

Marlin/src/HAL/DUE/MarlinSerialUSB.h

@@ -0,0 +1,65 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * MarlinSerialUSB_Due.h - Hardware Serial over USB (CDC) library for Arduino DUE
+ * Copyright (c) 2017 Eduardo José Tagle. All right reserved
+ */
+
+#include "../../inc/MarlinConfig.h"
+#include "../../core/serial_hook.h"
+
+#include <WString.h>
+
+struct MarlinSerialUSB {
+  void begin(const long);
+  void end();
+  int peek();
+  int read();
+  void flush();
+  int available();
+  size_t write(const uint8_t c);
+
+  #if ENABLED(SERIAL_STATS_DROPPED_RX)
+    FORCE_INLINE uint32_t dropped() { return 0; }
+  #endif
+
+  #if ENABLED(SERIAL_STATS_MAX_RX_QUEUED)
+    FORCE_INLINE int rxMaxEnqueued() { return 0; }
+  #endif
+};
+
+#if SERIAL_PORT == -1
+  typedef Serial1Class<MarlinSerialUSB> MSerialT1;
+  extern MSerialT1 customizedSerial1;
+#endif
+
+#if SERIAL_PORT_2 == -1
+  typedef Serial1Class<MarlinSerialUSB> MSerialT2;
+  extern MSerialT2 customizedSerial2;
+#endif
+
+#if SERIAL_PORT_3 == -1
+  typedef Serial1Class<MarlinSerialUSB> MSerialT3;
+  extern MSerialT3 customizedSerial3;
+#endif

Marlin/src/HAL/DUE/MinSerial.cpp

@@ -0,0 +1,91 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#ifdef ARDUINO_ARCH_SAM
+
+#include "../../inc/MarlinConfigPre.h"
+
+#if ENABLED(POSTMORTEM_DEBUGGING)
+
+#include "../shared/MinSerial.h"
+
+#include <stdarg.h>
+
+static void TXBegin() {
+  // Disable UART interrupt in NVIC
+  NVIC_DisableIRQ( UART_IRQn );
+
+  // We NEED memory barriers to ensure Interrupts are actually disabled!
+  // ( https://dzone.com/articles/nvic-disabling-interrupts-on-arm-cortex-m-and-the )
+  __DSB();
+  __ISB();
+
+  // Disable clock
+  pmc_disable_periph_clk( ID_UART );
+
+  // Configure PMC
+  pmc_enable_periph_clk( ID_UART );
+
+  // Disable PDC channel
+  UART->UART_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS;
+
+  // Reset and disable receiver and transmitter
+  UART->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX | UART_CR_RXDIS | UART_CR_TXDIS;
+
+  // Configure mode: 8bit, No parity, 1 bit stop
+  UART->UART_MR = UART_MR_CHMODE_NORMAL | US_MR_CHRL_8_BIT | US_MR_NBSTOP_1_BIT | UART_MR_PAR_NO;
+
+  // Configure baudrate (asynchronous, no oversampling) to BAUDRATE bauds
+  UART->UART_BRGR = (SystemCoreClock / (BAUDRATE << 4));
+
+  // Enable receiver and transmitter
+  UART->UART_CR = UART_CR_RXEN | UART_CR_TXEN;
+}
+
+// A SW memory barrier, to ensure GCC does not overoptimize loops
+#define sw_barrier() __asm__ volatile("": : :"memory");
+static void TX(char c) {
+  while (!(UART->UART_SR & UART_SR_TXRDY)) { WDT_Restart(WDT); sw_barrier(); };
+  UART->UART_THR = c;
+}
+
+void install_min_serial() {
+  HAL_min_serial_init = &TXBegin;
+  HAL_min_serial_out = &TX;
+}
+
+#if DISABLED(DYNAMIC_VECTORTABLE)
+  extern "C" {
+    __attribute__((naked)) void JumpHandler_ASM() {
+      __asm__ __volatile__ (
+        "b CommonHandler_ASM\n"
+      );
+    }
+    void __attribute__((naked, alias("JumpHandler_ASM"))) HardFault_Handler();
+    void __attribute__((naked, alias("JumpHandler_ASM"))) BusFault_Handler();
+    void __attribute__((naked, alias("JumpHandler_ASM"))) UsageFault_Handler();
+    void __attribute__((naked, alias("JumpHandler_ASM"))) MemManage_Handler();
+    void __attribute__((naked, alias("JumpHandler_ASM"))) NMI_Handler();
+  }
+#endif
+
+#endif // POSTMORTEM_DEBUGGING
+#endif // ARDUINO_ARCH_SAM

Marlin/src/HAL/DUE/Servo.cpp

@@ -0,0 +1,163 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+  Copyright (c) 2013 Arduino LLC. All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#ifdef ARDUINO_ARCH_SAM
+
+#include "../../inc/MarlinConfig.h"
+
+#if HAS_SERVOS
+
+#include "../shared/servo.h"
+#include "../shared/servo_private.h"
+
+static Flags<_Nbr_16timers> DisablePending; // ISR should disable the timer at the next timer reset
+
+// ------------------------
+// Interrupt handler for the TC0 channel 1.
+// ------------------------
+void Servo_Handler(const timer16_Sequence_t, Tc*, const uint8_t);
+
+#ifdef _useTimer1
+  void HANDLER_FOR_TIMER1() { Servo_Handler(_timer1, TC_FOR_TIMER1, CHANNEL_FOR_TIMER1); }
+#endif
+#ifdef _useTimer2
+  void HANDLER_FOR_TIMER2() { Servo_Handler(_timer2, TC_FOR_TIMER2, CHANNEL_FOR_TIMER2); }
+#endif
+#ifdef _useTimer3
+  void HANDLER_FOR_TIMER3() { Servo_Handler(_timer3, TC_FOR_TIMER3, CHANNEL_FOR_TIMER3); }
+#endif
+#ifdef _useTimer4
+  void HANDLER_FOR_TIMER4() { Servo_Handler(_timer4, TC_FOR_TIMER4, CHANNEL_FOR_TIMER4); }
+#endif
+#ifdef _useTimer5
+  void HANDLER_FOR_TIMER5() { Servo_Handler(_timer5, TC_FOR_TIMER5, CHANNEL_FOR_TIMER5); }
+#endif
+
+void Servo_Handler(const timer16_Sequence_t timer, Tc *tc, const uint8_t channel) {
+  static int8_t Channel[_Nbr_16timers];                               // Servo counters to pulse (or -1 for refresh interval)
+  int8_t cho = Channel[timer];                                        // Handle the prior Channel[timer] first
+  if (cho < 0) {                                                      // Channel -1 indicates the refresh interval completed...
+    tc->TC_CHANNEL[channel].TC_CCR |= TC_CCR_SWTRG;                   // ...so reset the timer
+    if (DisablePending[timer]) {
+      // Disabling only after the full servo period expires prevents
+      // pulses being too close together if immediately re-enabled.
+      DisablePending.clear(timer);
+      TC_Stop(tc, channel);
+      tc->TC_CHANNEL[channel].TC_SR;                                  // clear interrupt
+      return;
+    }
+  }
+  else if (SERVO_INDEX(timer, cho) < ServoCount)                      // prior channel handled?
+    extDigitalWrite(SERVO(timer, cho).Pin.nbr, LOW);                  // pulse the prior channel LOW
+
+  Channel[timer] = ++cho;                                             // go to the next channel (or 0)
+  if (cho < SERVOS_PER_TIMER && SERVO_INDEX(timer, cho) < ServoCount) {
+    tc->TC_CHANNEL[channel].TC_RA = tc->TC_CHANNEL[channel].TC_CV + SERVO(timer, cho).ticks;
+    if (SERVO(timer, cho).Pin.isActive)                               // activated?
+      extDigitalWrite(SERVO(timer, cho).Pin.nbr, HIGH);               // yes: pulse HIGH
+  }
+  else {
+    // finished all channels so wait for the refresh period to expire before starting over
+    const unsigned int cval = tc->TC_CHANNEL[channel].TC_CV + 128 / (SERVO_TIMER_PRESCALER), // allow 128 cycles to ensure the next CV not missed
+                       ival = (unsigned int)usToTicks(REFRESH_INTERVAL); // at least REFRESH_INTERVAL has elapsed
+    tc->TC_CHANNEL[channel].TC_RA = max(cval, ival);
+
+    Channel[timer] = -1;                                              // reset the timer CCR on the next call
+  }
+
+  tc->TC_CHANNEL[channel].TC_SR;                                      // clear interrupt
+}
+
+static void _initISR(Tc *tc, uint32_t channel, uint32_t id, IRQn_Type irqn) {
+  pmc_enable_periph_clk(id);
+  TC_Configure(tc, channel,
+      TC_CMR_WAVE                   // Waveform mode
+    | TC_CMR_WAVSEL_UP_RC           // Counter running up and reset when equal to RC
+    | (SERVO_TIMER_PRESCALER ==   2 ? TC_CMR_TCCLKS_TIMER_CLOCK1 : 0) // MCK/2
+    | (SERVO_TIMER_PRESCALER ==   8 ? TC_CMR_TCCLKS_TIMER_CLOCK2 : 0) // MCK/8
+    | (SERVO_TIMER_PRESCALER ==  32 ? TC_CMR_TCCLKS_TIMER_CLOCK3 : 0) // MCK/32
+    | (SERVO_TIMER_PRESCALER == 128 ? TC_CMR_TCCLKS_TIMER_CLOCK4 : 0) // MCK/128
+  );
+
+  // Wait 1ms before the first ISR
+  TC_SetRA(tc, channel, (F_CPU) / (SERVO_TIMER_PRESCALER) / 1000UL); // 1ms
+
+  // Configure and enable interrupt
+  NVIC_EnableIRQ(irqn);
+  tc->TC_CHANNEL[channel].TC_IER = TC_IER_CPAS; // TC_IER_CPAS: RA Compare
+
+  // Enables the timer clock and performs a software reset to start the counting
+  TC_Start(tc, channel);
+}
+
+void initISR(const timer16_Sequence_t timer_index) {
+  CRITICAL_SECTION_START();
+  const bool disable_soon = DisablePending[timer_index];
+  DisablePending.clear(timer_index);
+  CRITICAL_SECTION_END();
+
+  if (!disable_soon) switch (timer_index) {
+    default: break;
+    #ifdef _useTimer1
+      case _timer1: return _initISR(TC_FOR_TIMER1, CHANNEL_FOR_TIMER1, ID_TC_FOR_TIMER1, IRQn_FOR_TIMER1);
+    #endif
+    #ifdef _useTimer2
+      case _timer2: return _initISR(TC_FOR_TIMER2, CHANNEL_FOR_TIMER2, ID_TC_FOR_TIMER2, IRQn_FOR_TIMER2);
+    #endif
+    #ifdef _useTimer3
+      case _timer3: return _initISR(TC_FOR_TIMER3, CHANNEL_FOR_TIMER3, ID_TC_FOR_TIMER3, IRQn_FOR_TIMER3);
+    #endif
+    #ifdef _useTimer4
+      case _timer4: return _initISR(TC_FOR_TIMER4, CHANNEL_FOR_TIMER4, ID_TC_FOR_TIMER4, IRQn_FOR_TIMER4);
+    #endif
+    #ifdef _useTimer5
+      case _timer5: return _initISR(TC_FOR_TIMER5, CHANNEL_FOR_TIMER5, ID_TC_FOR_TIMER5, IRQn_FOR_TIMER5);
+    #endif
+  }
+}
+
+void finISR(const timer16_Sequence_t timer_index) {
+  // Timer is disabled from the ISR, to ensure proper final pulse length.
+  DisablePending.set(timer_index);
+}
+
+#endif // HAS_SERVOS
+
+#endif // ARDUINO_ARCH_SAM

Marlin/src/HAL/DUE/ServoTimers.h

@@ -0,0 +1,107 @@
+/**
+ * Copyright (c) 2013 Arduino LLC. All right reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * Defines for 16 bit timers used with  Servo library
+ *
+ * If _useTimerX is defined then TimerX is a 32 bit timer on the current board
+ * timer16_Sequence_t enumerates the sequence that the timers should be allocated
+ * _Nbr_16timers indicates how many timers are available.
+ */
+
+/**
+ * SAM Only definitions
+ * --------------------
+ */
+
+// For SAM3X:
+//!#define _useTimer1
+//!#define _useTimer2
+#define _useTimer3
+//!#define _useTimer4
+#define _useTimer5
+
+#define TRIM_DURATION             2   // compensation ticks to trim adjust for digitalWrite delays
+#define SERVO_TIMER_PRESCALER     2   // timer prescaler
+
+/*
+  TC0, chan 0 => TC0_Handler
+  TC0, chan 1 => TC1_Handler
+  TC0, chan 2 => TC2_Handler
+  TC1, chan 0 => TC3_Handler
+  TC1, chan 1 => TC4_Handler
+  TC1, chan 2 => TC5_Handler
+  TC2, chan 0 => TC6_Handler
+  TC2, chan 1 => TC7_Handler
+  TC2, chan 2 => TC8_Handler
+ */
+
+#ifdef _useTimer1
+  #define TC_FOR_TIMER1       TC1
+  #define CHANNEL_FOR_TIMER1  0
+  #define ID_TC_FOR_TIMER1    ID_TC3
+  #define IRQn_FOR_TIMER1     TC3_IRQn
+  #define HANDLER_FOR_TIMER1  TC3_Handler
+#endif
+#ifdef _useTimer2
+  #define TC_FOR_TIMER2       TC1
+  #define CHANNEL_FOR_TIMER2  1
+  #define ID_TC_FOR_TIMER2    ID_TC4
+  #define IRQn_FOR_TIMER2     TC4_IRQn
+  #define HANDLER_FOR_TIMER2  TC4_Handler
+#endif
+#ifdef _useTimer3
+  #define TC_FOR_TIMER3       TC1
+  #define CHANNEL_FOR_TIMER3  2
+  #define ID_TC_FOR_TIMER3    ID_TC5
+  #define IRQn_FOR_TIMER3     TC5_IRQn
+  #define HANDLER_FOR_TIMER3  TC5_Handler
+#endif
+#ifdef _useTimer4
+  #define TC_FOR_TIMER4       TC0
+  #define CHANNEL_FOR_TIMER4  2
+  #define ID_TC_FOR_TIMER4    ID_TC2
+  #define IRQn_FOR_TIMER4     TC2_IRQn
+  #define HANDLER_FOR_TIMER4  TC2_Handler
+#endif
+#ifdef _useTimer5
+  #define TC_FOR_TIMER5       TC0
+  #define CHANNEL_FOR_TIMER5  0
+  #define ID_TC_FOR_TIMER5    ID_TC0
+  #define IRQn_FOR_TIMER5     TC0_IRQn
+  #define HANDLER_FOR_TIMER5  TC0_Handler
+#endif
+
+typedef enum : unsigned char {
+  #ifdef _useTimer1
+    _timer1,
+  #endif
+  #ifdef _useTimer2
+    _timer2,
+  #endif
+  #ifdef _useTimer3
+    _timer3,
+  #endif
+  #ifdef _useTimer4
+    _timer4,
+  #endif
+  #ifdef _useTimer5
+    _timer5,
+  #endif
+  _Nbr_16timers
+} timer16_Sequence_t;

Marlin/src/HAL/DUE/Tone.cpp

@@ -0,0 +1,60 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Description: Tone function for Arduino Due and compatible (SAM3X8E)
+ * Derived from https://forum.arduino.cc/t/arduino-due-and-tone/133302/13
+ */
+
+#ifdef ARDUINO_ARCH_SAM
+
+#include "../../inc/MarlinConfig.h"
+#include "HAL.h"
+
+static pin_t tone_pin;
+volatile static int32_t toggles;
+
+void tone(const pin_t _pin, const unsigned int frequency, const unsigned long duration/*=0*/) {
+  tone_pin = _pin;
+  toggles = 2 * frequency * duration / 1000;
+  HAL_timer_start(MF_TIMER_TONE, 2 * frequency);
+}
+
+void noTone(const pin_t _pin) {
+  HAL_timer_disable_interrupt(MF_TIMER_TONE);
+  extDigitalWrite(_pin, LOW);
+}
+
+HAL_TONE_TIMER_ISR() {
+  static uint8_t pin_state = 0;
+  HAL_timer_isr_prologue(MF_TIMER_TONE);
+
+  if (toggles) {
+    toggles--;
+    extDigitalWrite(tone_pin, (pin_state ^= 1));
+  }
+  else noTone(tone_pin);                         // turn off interrupt
+}
+
+#endif // ARDUINO_ARCH_SAM

Marlin/src/HAL/DUE/eeprom/eeprom_flash.cpp

@@ -0,0 +1,997 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#ifdef ARDUINO_ARCH_SAM
+
+#include "../../../inc/MarlinConfig.h"
+
+#if ENABLED(FLASH_EEPROM_EMULATION)
+
+/* EEPROM emulation over flash with reduced wear
+ *
+ * We will use 2 contiguous groups of pages as main and alternate.
+ * We want an structure that allows to read as fast as possible,
+ * without the need of scanning the whole FLASH memory.
+ *
+ * FLASH bits default erased state is 1, and can be set to 0
+ * on a per bit basis. To reset them to 1, a full page erase
+ * is needed.
+ *
+ * Values are stored as differences that should be applied to a
+ * completely erased EEPROM (filled with 0xFFs). We just encode
+ * the starting address of the values to change, the length of
+ * the block of new values, and the values themselves. All diffs
+ * are accumulated into a RAM buffer, compacted into the least
+ * amount of non overlapping diffs possible and sorted by starting
+ * address before being saved into the next available page of FLASH
+ * of the current group.
+ * Once the current group is completely full, we compact it and save
+ * it into the other group, then erase the current group and switch
+ * to that new group and set it as current.
+ *
+ * The FLASH endurance is about 1/10 ... 1/100 of an EEPROM
+ * endurance, but EEPROM endurance is specified per byte, not
+ * per page. We can't emulate EE endurance with FLASH for all
+ * bytes, but we can emulate endurance for a given percent of
+ * bytes.
+ */
+
+//#define EE_EMU_DEBUG
+
+#define EEPROMSize     4096
+#define PagesPerGroup   128
+#define GroupCount        2
+#define PageSize        256U
+
+ /* Flash storage */
+typedef struct FLASH_SECTOR {
+  uint8_t page[PageSize];
+} FLASH_SECTOR_T;
+
+#define PAGE_FILL \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, \
+  0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF
+
+#define FLASH_INIT_FILL \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL, \
+  PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL,PAGE_FILL
+
+/* This is the FLASH area used to emulate a 2Kbyte EEPROM  -- We need this buffer aligned
+   to a 256 byte boundary. */
+static const uint8_t flashStorage[PagesPerGroup * GroupCount * PageSize] __attribute__ ((aligned (PageSize))) = { FLASH_INIT_FILL };
+
+/* Get the address of an specific page */
+static const FLASH_SECTOR_T* getFlashStorage(int page) {
+  return (const FLASH_SECTOR_T*)&flashStorage[page*PageSize];
+}
+
+static uint8_t buffer[256] = {0},   // The RAM buffer to accumulate writes
+               curPage = 0,         // Current FLASH page inside the group
+               curGroup = 0xFF;     // Current FLASH group
+
+#define DEBUG_OUT ENABLED(EE_EMU_DEBUG)
+#include "../../../core/debug_out.h"
+
+static void ee_Dump(const int page, const void *data) {
+
+  #ifdef EE_EMU_DEBUG
+
+    const uint8_t *c = (const uint8_t*) data;
+    char buffer[80];
+
+    sprintf_P(buffer, PSTR("Page: %d (0x%04x)\n"), page, page);
+    DEBUG_ECHO(buffer);
+
+    char* p = &buffer[0];
+    for (int i = 0; i< PageSize; ++i) {
+      if ((i & 0xF) == 0) p += sprintf_P(p, PSTR("%04x] "), i);
+
+      p += sprintf_P(p, PSTR(" %02x"), c[i]);
+      if ((i & 0xF) == 0xF) {
+        *p++ = '\n';
+        *p = 0;
+        DEBUG_ECHO(buffer);
+        p = &buffer[0];
+      }
+    }
+
+  #else
+    UNUSED(page);
+    UNUSED(data);
+  #endif
+}
+
+/* Flash Writing Protection Key */
+#define FWP_KEY    0x5Au
+
+#if SAM4S_SERIES
+  #define EEFC_FCR_FCMD(value) \
+  ((EEFC_FCR_FCMD_Msk & ((value) << EEFC_FCR_FCMD_Pos)))
+  #define EEFC_ERROR_FLAGS  (EEFC_FSR_FLOCKE | EEFC_FSR_FCMDE | EEFC_FSR_FLERR)
+#else
+  #define EEFC_ERROR_FLAGS  (EEFC_FSR_FLOCKE | EEFC_FSR_FCMDE)
+#endif
+
+/**
+ * Writes the contents of the specified page (no previous erase)
+ * @param page    (page #)
+ * @param data    (pointer to the data buffer)
+ */
+__attribute__ ((long_call, section (".ramfunc")))
+static bool ee_PageWrite(uint16_t page, const void *data) {
+
+  uint16_t i;
+  uint32_t addrflash = uint32_t(getFlashStorage(page));
+
+  // Read the flash contents
+  uint32_t pageContents[PageSize>>2];
+  memcpy(pageContents, (void*)addrflash, PageSize);
+
+  // We ONLY want to toggle bits that have changed, and that have changed to 0.
+  // SAM3X8E tends to destroy contiguous bits if reprogrammed without erasing, so
+  // we try by all means to avoid this. That is why it says: "The Partial
+  // Programming mode works only with 128-bit (or higher) boundaries. It cannot
+  // be used with boundaries lower than 128 bits (8, 16 or 32-bit for example)."
+  // All bits that did not change, set them to 1.
+  for (i = 0; i <PageSize >> 2; i++)
+    pageContents[i] = (((uint32_t*)data)[i]) | (~(pageContents[i] ^ ((uint32_t*)data)[i]));
+
+  DEBUG_ECHO_MSG("EEPROM PageWrite   ", page);
+  DEBUG_ECHOLNPGM(" in FLASH address ", (uint32_t)addrflash);
+  DEBUG_ECHOLNPGM(" base address     ", (uint32_t)getFlashStorage(0));
+  DEBUG_FLUSH();
+
+  // Get the page relative to the start of the EFC controller, and the EFC controller to use
+  Efc *efc;
+  uint16_t fpage;
+  if (addrflash >= IFLASH1_ADDR) {
+    efc = EFC1;
+    fpage = (addrflash - IFLASH1_ADDR) / IFLASH1_PAGE_SIZE;
+  }
+  else {
+    efc = EFC0;
+    fpage = (addrflash - IFLASH0_ADDR) / IFLASH0_PAGE_SIZE;
+  }
+
+  // Get the page that must be unlocked, then locked
+  uint16_t lpage = fpage & (~((IFLASH0_LOCK_REGION_SIZE / IFLASH0_PAGE_SIZE) - 1));
+
+  // Disable all interrupts
+  __disable_irq();
+
+  // Get the FLASH wait states
+  uint32_t orgWS = (efc->EEFC_FMR & EEFC_FMR_FWS_Msk) >> EEFC_FMR_FWS_Pos;
+
+  // Set wait states to 6 (SAM errata)
+  efc->EEFC_FMR = (efc->EEFC_FMR & (~EEFC_FMR_FWS_Msk)) | EEFC_FMR_FWS(6);
+
+  // Unlock the flash page
+  uint32_t status;
+  efc->EEFC_FCR = EEFC_FCR_FKEY(FWP_KEY) | EEFC_FCR_FARG(lpage) | EEFC_FCR_FCMD(EFC_FCMD_CLB);
+  while (((status = efc->EEFC_FSR) & EEFC_FSR_FRDY) != EEFC_FSR_FRDY) {
+    // force compiler to not optimize this -- NOPs don't work!
+    __asm__ __volatile__("");
+  };
+
+  if ((status & EEFC_ERROR_FLAGS) != 0) {
+
+    // Restore original wait states
+    efc->EEFC_FMR = (efc->EEFC_FMR & (~EEFC_FMR_FWS_Msk)) | EEFC_FMR_FWS(orgWS);
+
+    // Reenable interrupts
+    __enable_irq();
+
+    DEBUG_ECHO_MSG("EEPROM Unlock failure for page ", page);
+    return false;
+  }
+
+  // Write page and lock:  Writing 8-bit and 16-bit data is not allowed and may lead to unpredictable data corruption.
+  const uint32_t * aligned_src = (const uint32_t *) &pageContents[0]; /*data;*/
+  uint32_t * p_aligned_dest = (uint32_t *) addrflash;
+  for (i = 0; i < (IFLASH0_PAGE_SIZE / sizeof(uint32_t)); ++i) {
+    *p_aligned_dest++ = *aligned_src++;
+  }
+  efc->EEFC_FCR = EEFC_FCR_FKEY(FWP_KEY) | EEFC_FCR_FARG(fpage) | EEFC_FCR_FCMD(EFC_FCMD_WPL);
+  while (((status = efc->EEFC_FSR) & EEFC_FSR_FRDY) != EEFC_FSR_FRDY) {
+    // force compiler to not optimize this -- NOPs don't work!
+    __asm__ __volatile__("");
+  };
+
+  if ((status & EEFC_ERROR_FLAGS) != 0) {
+
+    // Restore original wait states
+    efc->EEFC_FMR = (efc->EEFC_FMR & (~EEFC_FMR_FWS_Msk)) | EEFC_FMR_FWS(orgWS);
+
+    // Reenable interrupts
+    __enable_irq();
+
+    DEBUG_ECHO_MSG("EEPROM Write failure for page ", page);
+
+    return false;
+  }
+
+  // Restore original wait states
+  efc->EEFC_FMR = (efc->EEFC_FMR & (~EEFC_FMR_FWS_Msk)) | EEFC_FMR_FWS(orgWS);
+
+  // Reenable interrupts
+  __enable_irq();
+
+  // Compare contents
+  if (memcmp(getFlashStorage(page),data,PageSize)) {
+
+    #ifdef EE_EMU_DEBUG
+      DEBUG_ECHO_MSG("EEPROM Verify Write failure for page ", page);
+
+      ee_Dump( page, (uint32_t *)addrflash);
+      ee_Dump(-page, data);
+
+      // Calculate count of changed bits
+      uint32_t *p1 = (uint32_t*)addrflash;
+      uint32_t *p2 = (uint32_t*)data;
+      int count = 0;
+      for (i = 0; i < PageSize >> 2; i++) {
+        if (p1[i] != p2[i]) {
+          uint32_t delta = p1[i] ^ p2[i];
+          while (delta) {
+            if ((delta&1) != 0)
+              count++;
+            delta >>= 1;
+          }
+        }
+      }
+      DEBUG_ECHOLNPGM("--> Differing bits: ", count);
+    #endif
+
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Erases the contents of the specified page
+ * @param page    (page #)
+  */
+__attribute__ ((long_call, section (".ramfunc")))
+static bool ee_PageErase(uint16_t page) {
+
+  uint16_t i;
+  uint32_t addrflash = uint32_t(getFlashStorage(page));
+
+  DEBUG_ECHO_MSG("EEPROM PageErase  ", page);
+  DEBUG_ECHOLNPGM(" in FLASH address ", (uint32_t)addrflash);
+  DEBUG_ECHOLNPGM(" base address     ", (uint32_t)getFlashStorage(0));
+  DEBUG_FLUSH();
+
+  // Get the page relative to the start of the EFC controller, and the EFC controller to use
+  Efc *efc;
+  uint16_t fpage;
+  if (addrflash >= IFLASH1_ADDR) {
+    efc = EFC1;
+    fpage = (addrflash - IFLASH1_ADDR) / IFLASH1_PAGE_SIZE;
+  }
+  else {
+    efc = EFC0;
+    fpage = (addrflash - IFLASH0_ADDR) / IFLASH0_PAGE_SIZE;
+  }
+
+  // Get the page that must be unlocked, then locked
+  uint16_t lpage = fpage & (~((IFLASH0_LOCK_REGION_SIZE / IFLASH0_PAGE_SIZE) - 1));
+
+  // Disable all interrupts
+  __disable_irq();
+
+  // Get the FLASH wait states
+  uint32_t orgWS = (efc->EEFC_FMR & EEFC_FMR_FWS_Msk) >> EEFC_FMR_FWS_Pos;
+
+  // Set wait states to 6 (SAM errata)
+  efc->EEFC_FMR = (efc->EEFC_FMR & (~EEFC_FMR_FWS_Msk)) | EEFC_FMR_FWS(6);
+
+  // Unlock the flash page
+  uint32_t status;
+  efc->EEFC_FCR = EEFC_FCR_FKEY(FWP_KEY) | EEFC_FCR_FARG(lpage) | EEFC_FCR_FCMD(EFC_FCMD_CLB);
+  while (((status = efc->EEFC_FSR) & EEFC_FSR_FRDY) != EEFC_FSR_FRDY) {
+    // force compiler to not optimize this -- NOPs don't work!
+    __asm__ __volatile__("");
+  };
+  if ((status & EEFC_ERROR_FLAGS) != 0) {
+
+    // Restore original wait states
+    efc->EEFC_FMR = (efc->EEFC_FMR & (~EEFC_FMR_FWS_Msk)) | EEFC_FMR_FWS(orgWS);
+
+    // Reenable interrupts
+    __enable_irq();
+
+    DEBUG_ECHO_MSG("EEPROM Unlock failure for page ",page);
+
+    return false;
+  }
+
+  // Erase Write page and lock: Writing 8-bit and 16-bit data is not allowed and may lead to unpredictable data corruption.
+  uint32_t * p_aligned_dest = (uint32_t *) addrflash;
+  for (i = 0; i < (IFLASH0_PAGE_SIZE / sizeof(uint32_t)); ++i) {
+    *p_aligned_dest++ = 0xFFFFFFFF;
+  }
+  efc->EEFC_FCR = EEFC_FCR_FKEY(FWP_KEY) | EEFC_FCR_FARG(fpage) | EEFC_FCR_FCMD(EFC_FCMD_EWPL);
+  while (((status = efc->EEFC_FSR) & EEFC_FSR_FRDY) != EEFC_FSR_FRDY) {
+    // force compiler to not optimize this -- NOPs don't work!
+    __asm__ __volatile__("");
+  };
+  if ((status & EEFC_ERROR_FLAGS) != 0) {
+
+    // Restore original wait states
+    efc->EEFC_FMR = (efc->EEFC_FMR & (~EEFC_FMR_FWS_Msk)) | EEFC_FMR_FWS(orgWS);
+
+    // Reenable interrupts
+    __enable_irq();
+
+    DEBUG_ECHO_MSG("EEPROM Erase failure for page ",page);
+
+    return false;
+  }
+
+  // Restore original wait states
+  efc->EEFC_FMR = (efc->EEFC_FMR & (~EEFC_FMR_FWS_Msk)) | EEFC_FMR_FWS(orgWS);
+
+  // Reenable interrupts
+  __enable_irq();
+
+  // Check erase
+  uint32_t * aligned_src = (uint32_t *) addrflash;
+  for (i = 0; i < PageSize >> 2; i++) {
+    if (*aligned_src++ != 0xFFFFFFFF) {
+      DEBUG_ECHO_MSG("EEPROM Verify Erase failure for page ",page);
+      ee_Dump(page, (uint32_t *)addrflash);
+      return false;
+    }
+  }
+
+  return true;
+}
+
+static uint8_t ee_Read(uint32_t address, bool excludeRAMBuffer=false) {
+
+  uint32_t baddr;
+  uint32_t blen;
+
+  // If we were requested an address outside of the emulated range, fail now
+  if (address >= EEPROMSize)
+    return false;
+
+  // Check that the value is not contained in the RAM buffer
+  if (!excludeRAMBuffer) {
+    uint16_t i = 0;
+    while (i <= (PageSize - 4)) { /* (PageSize - 4) because otherwise, there is not enough room for data and headers */
+
+      // Get the address of the block
+      baddr = buffer[i] | (buffer[i + 1] << 8);
+
+      // Get the length of the block
+      blen = buffer[i + 2];
+
+      // If we reach the end of the list, break loop
+      if (blen == 0xFF)
+        break;
+
+      // Check if data is contained in this block
+      if (address >= baddr &&
+        address < (baddr + blen)) {
+
+        // Yes, it is contained. Return it!
+        return buffer[i + 3 + address - baddr];
+      }
+
+      // As blocks are always sorted, if the starting address of this block is higher
+      // than the address we are looking for, break loop now - We wont find the value
+      // associated to the address
+      if (baddr > address)
+        break;
+
+      // Jump to the next block
+      i += 3 + blen;
+    }
+  }
+
+  // It is NOT on the RAM buffer. It could be stored in FLASH. We are
+  //  ensured on a given FLASH page, address contents are never repeated
+  //  but on different pages, there is no such warranty, so we must go
+  //  backwards from the last written FLASH page to the first one.
+  for (int page = curPage - 1; page >= 0; --page) {
+
+    // Get a pointer to the flash page
+    uint8_t *pflash = (uint8_t*)getFlashStorage(page + curGroup * PagesPerGroup);
+
+    uint16_t i = 0;
+    while (i <= (PageSize - 4)) { /* (PageSize - 4) because otherwise, there is not enough room for data and headers */
+
+      // Get the address of the block
+      baddr = pflash[i] | (pflash[i + 1] << 8);
+
+      // Get the length of the block
+      blen = pflash[i + 2];
+
+      // If we reach the end of the list, break loop
+      if (blen == 0xFF)
+        break;
+
+      // Check if data is contained in this block
+      if (address >= baddr && address < (baddr + blen))
+        return pflash[i + 3 + address - baddr]; // Yes, it is contained. Return it!
+
+      // As blocks are always sorted, if the starting address of this block is higher
+      // than the address we are looking for, break loop now - We wont find the value
+      // associated to the address
+      if (baddr > address) break;
+
+      // Jump to the next block
+      i += 3 + blen;
+    }
+  }
+
+  // If reached here, value is not stored, so return its default value
+  return 0xFF;
+}
+
+static uint32_t ee_GetAddrRange(uint32_t address, bool excludeRAMBuffer=false) {
+  uint32_t baddr,
+           blen,
+           nextAddr = 0xFFFF,
+           nextRange = 0;
+
+  // Check that the value is not contained in the RAM buffer
+  if (!excludeRAMBuffer) {
+    uint16_t i = 0;
+    while (i <= (PageSize - 4)) { /* (PageSize - 4) because otherwise, there is not enough room for data and headers */
+
+      // Get the address of the block
+      baddr = buffer[i] | (buffer[i + 1] << 8);
+
+      // Get the length of the block
+      blen = buffer[i + 2];
+
+      // If we reach the end of the list, break loop
+      if (blen == 0xFF) break;
+
+      // Check if address and address + 1 is contained in this block
+      if (address >= baddr && address < (baddr + blen))
+        return address | ((blen - address + baddr) << 16); // Yes, it is contained. Return it!
+
+      // Otherwise, check if we can use it as a limit
+      if (baddr > address && baddr < nextAddr) {
+        nextAddr = baddr;
+        nextRange = blen;
+      }
+
+      // As blocks are always sorted, if the starting address of this block is higher
+      // than the address we are looking for, break loop now - We wont find the value
+      // associated to the address
+      if (baddr > address) break;
+
+      // Jump to the next block
+      i += 3 + blen;
+    }
+  }
+
+  // It is NOT on the RAM buffer. It could be stored in FLASH. We are
+  //  ensured on a given FLASH page, address contents are never repeated
+  //  but on different pages, there is no such warranty, so we must go
+  //  backwards from the last written FLASH page to the first one.
+  for (int page = curPage - 1; page >= 0; --page) {
+
+    // Get a pointer to the flash page
+    uint8_t *pflash = (uint8_t*)getFlashStorage(page + curGroup * PagesPerGroup);
+
+    uint16_t i = 0;
+    while (i <= (PageSize - 4)) { /* (PageSize - 4) because otherwise, there is not enough room for data and headers */
+
+      // Get the address of the block
+      baddr = pflash[i] | (pflash[i + 1] << 8);
+
+      // Get the length of the block
+      blen = pflash[i + 2];
+
+      // If we reach the end of the list, break loop
+      if (blen == 0xFF) break;
+
+      // Check if data is contained in this block
+      if (address >= baddr && address < (baddr + blen))
+        return address | ((blen - address + baddr) << 16); // Yes, it is contained. Return it!
+
+      // Otherwise, check if we can use it as a limit
+      if (baddr > address && baddr < nextAddr) {
+        nextAddr = baddr;
+        nextRange = blen;
+      }
+
+      // As blocks are always sorted, if the starting address of this block is higher
+      // than the address we are looking for, break loop now - We wont find the value
+      // associated to the address
+      if (baddr > address) break;
+
+      // Jump to the next block
+      i += 3 + blen;
+    }
+  }
+
+  // If reached here, we will return the next valid address
+  return nextAddr | (nextRange << 16);
+}
+
+static bool ee_IsPageClean(int page) {
+  uint32_t *pflash = (uint32_t*) getFlashStorage(page);
+  for (uint16_t i = 0; i < (PageSize >> 2); ++i)
+    if (*pflash++ != 0xFFFFFFFF) return false;
+  return true;
+}
+
+static bool ee_Flush(uint32_t overrideAddress = 0xFFFFFFFF, uint8_t overrideData=0xFF) {
+
+  // Check if RAM buffer has something to be written
+  bool isEmpty = true;
+  uint32_t *p = (uint32_t*) &buffer[0];
+  for (uint16_t j = 0; j < (PageSize >> 2); j++) {
+    if (*p++ != 0xFFFFFFFF) {
+      isEmpty = false;
+      break;
+    }
+  }
+
+  // If something has to be written, do so!
+  if (!isEmpty) {
+
+    // Write the current ram buffer into FLASH
+    ee_PageWrite(curPage + curGroup * PagesPerGroup, buffer);
+
+    // Clear the RAM buffer
+    memset(buffer, 0xFF, sizeof(buffer));
+
+    // Increment the page to use the next time
+    ++curPage;
+  }
+
+  // Did we reach the maximum count of available pages per group for storage ?
+  if (curPage < PagesPerGroup) {
+
+    // Do we have an override address ?
+    if (overrideAddress < EEPROMSize) {
+
+      // Yes, just store the value into the RAM buffer
+      buffer[0] = overrideAddress & 0xFF;
+      buffer[0 + 1] = (overrideAddress >> 8) & 0xFF;
+      buffer[0 + 2] = 1;
+      buffer[0 + 3] = overrideData;
+    }
+
+    // Done!
+    return true;
+  }
+
+  // We have no space left on the current group - We must compact the values
+  uint16_t i = 0;
+
+  // Compute the next group to use
+  int curwPage = 0, curwGroup = curGroup + 1;
+  if (curwGroup >= GroupCount) curwGroup = 0;
+
+  uint32_t rdAddr = 0;
+  do {
+
+    // Get the next valid range
+    uint32_t addrRange = ee_GetAddrRange(rdAddr, true);
+
+    // Make sure not to skip the override address, if specified
+    int rdRange;
+    if (overrideAddress < EEPROMSize &&
+      rdAddr <= overrideAddress &&
+      (addrRange & 0xFFFF) > overrideAddress) {
+
+      rdAddr = overrideAddress;
+      rdRange = 1;
+    }
+    else {
+      rdAddr = addrRange & 0xFFFF;
+      rdRange = addrRange >> 16;
+    }
+
+    // If no range, break loop
+    if (rdRange == 0)
+      break;
+
+    do {
+
+      // Get the value
+      uint8_t rdValue = overrideAddress == rdAddr ? overrideData : ee_Read(rdAddr, true);
+
+      // Do not bother storing default values
+      if (rdValue != 0xFF) {
+
+        // If we have room, add it to the buffer
+        if (buffer[i + 2] == 0xFF) {
+
+          // Uninitialized buffer, just add it!
+          buffer[i] = rdAddr & 0xFF;
+          buffer[i + 1] = (rdAddr >> 8) & 0xFF;
+          buffer[i + 2] = 1;
+          buffer[i + 3] = rdValue;
+
+        }
+        else {
+          // Buffer already has contents. Check if we can extend it
+
+          // Get the address of the block
+          uint32_t baddr = buffer[i] | (buffer[i + 1] << 8);
+
+          // Get the length of the block
+          uint32_t blen = buffer[i + 2];
+
+          // Can we expand it ?
+          if (rdAddr == (baddr + blen) &&
+            i < (PageSize - 4) && /* This block has a chance to contain data AND */
+            buffer[i + 2] < (PageSize - i - 3)) {/* There is room for this block to be expanded */
+
+            // Yes, do it
+            ++buffer[i + 2];
+
+            // And store the value
+            buffer[i + 3 + rdAddr - baddr] = rdValue;
+
+          }
+          else {
+
+            // No, we can't expand it - Skip the existing block
+            i += 3 + blen;
+
+            // Can we create a new slot ?
+            if (i > (PageSize - 4)) {
+
+              // Not enough space - Write the current buffer to FLASH
+              ee_PageWrite(curwPage + curwGroup * PagesPerGroup, buffer);
+
+              // Advance write page (as we are compacting, should never overflow!)
+              ++curwPage;
+
+              // Clear RAM buffer
+              memset(buffer, 0xFF, sizeof(buffer));
+
+              // Start fresh */
+              i = 0;
+            }
+
+            // Enough space, add the new block
+            buffer[i] = rdAddr & 0xFF;
+            buffer[i + 1] = (rdAddr >> 8) & 0xFF;
+            buffer[i + 2] = 1;
+            buffer[i + 3] = rdValue;
+          }
+        }
+      }
+
+      // Go to the next address
+      ++rdAddr;
+
+      // Repeat for bytes of this range
+    } while (--rdRange);
+
+    // Repeat until we run out of ranges
+  } while (rdAddr < EEPROMSize);
+
+  // We must erase the previous group, in preparation for the next swap
+  for (int page = 0; page < curPage; page++) {
+    ee_PageErase(page + curGroup * PagesPerGroup);
+  }
+
+  // Finally, Now the active group is the created new group
+  curGroup = curwGroup;
+  curPage = curwPage;
+
+  // Done!
+  return true;
+}
+
+static bool ee_Write(uint32_t address, uint8_t data) {
+
+  // If we were requested an address outside of the emulated range, fail now
+  if (address >= EEPROMSize) return false;
+
+  // Lets check if we have a block with that data previously defined. Block
+  //  start addresses are always sorted in ascending order
+  uint16_t i = 0;
+  while (i <= (PageSize - 4)) { /* (PageSize - 4) because otherwise, there is not enough room for data and headers */
+
+    // Get the address of the block
+    uint32_t baddr = buffer[i] | (buffer[i + 1] << 8);
+
+    // Get the length of the block
+    uint32_t blen = buffer[i + 2];
+
+    // If we reach the end of the list, break loop
+    if (blen == 0xFF)
+      break;
+
+    // Check if data is contained in this block
+    if (address >= baddr &&
+      address < (baddr + blen)) {
+
+      // Yes, it is contained. Just modify it
+      buffer[i + 3 + address - baddr] = data;
+
+      // Done!
+      return true;
+    }
+
+    // Maybe we could add it to the front or to the back
+    // of this block ?
+    if ((address + 1) == baddr || address == (baddr + blen)) {
+
+      // Potentially, it could be done. But we must ensure there is room
+      // so we can expand the block. Lets find how much free space remains
+      uint32_t iend = i;
+      do {
+        uint32_t ln = buffer[iend + 2];
+        if (ln == 0xFF) break;
+        iend += 3 + ln;
+      } while (iend <= (PageSize - 4)); /* (PageSize - 4) because otherwise, there is not enough room for data and headers */
+
+      // Here, inxt points to the first free address in the buffer. Do we have room ?
+      if (iend < PageSize) {
+        // Yes, at least a byte is free - We can expand the block
+
+        // Do we have to insert at the beginning ?
+        if ((address + 1) == baddr) {
+
+          // Insert at the beginning
+
+          // Make room at the beginning for our byte
+          memmove(&buffer[i + 3 + 1], &buffer[i + 3], iend - i - 3);
+
+          // Adjust the header and store the data
+          buffer[i] = address & 0xFF;
+          buffer[i + 1] = (address >> 8) & 0xFF;
+          buffer[i + 2]++;
+          buffer[i + 3] = data;
+
+        }
+        else {
+
+          // Insert at the end - There is a very interesting thing that could happen here:
+          //  Maybe we could coalesce the next block with this block. Let's try to do it!
+          uint16_t inext = i + 3 + blen;
+          if (inext <= (PageSize - 4) &&
+            (buffer[inext] | uint16_t(buffer[inext + 1] << 8)) == (baddr + blen + 1)) {
+            // YES! ... we can coalesce blocks! . Do it!
+
+            // Adjust this block header to include the next one
+            buffer[i + 2] += buffer[inext + 2] + 1;
+
+            // Store data at the right place
+            buffer[i + 3 + blen] = data;
+
+            // Remove the next block header and append its data
+            memmove(&buffer[inext + 1], &buffer[inext + 3], iend - inext - 3);
+
+            // Finally, as we have saved 2 bytes at the end, make sure to clean them
+            buffer[iend - 2] = 0xFF;
+            buffer[iend - 1] = 0xFF;
+
+          }
+          else {
+            // NO ... No coalescing possible yet
+
+            // Make room at the end for our byte
+            memmove(&buffer[i + 3 + blen + 1], &buffer[i + 3 + blen], iend - i - 3 - blen);
+
+            // And add the data to the block
+            buffer[i + 2]++;
+            buffer[i + 3 + blen] = data;
+          }
+        }
+
+        // Done!
+        return true;
+      }
+    }
+
+    // As blocks are always sorted, if the starting address of this block is higher
+    // than the address we are looking for, break loop now - We wont find the value
+    // associated to the address
+    if (baddr > address) break;
+
+    // Jump to the next block
+    i += 3 + blen;
+  }
+
+  // Value is not stored AND we can't expand previous block to contain it. We must create a new block
+
+  // First, lets find how much free space remains
+  uint32_t iend = i;
+  while (iend <= (PageSize - 4)) { /* (PageSize - 4) because otherwise, there is not enough room for data and headers */
+    uint32_t ln = buffer[iend + 2];
+    if (ln == 0xFF) break;
+    iend += 3 + ln;
+  }
+
+  // If there is room for a new block, insert it at the proper place
+  if (iend <= (PageSize - 4)) {
+
+    // We have room to create a new block. Do so --- But add
+    // the block at the proper position, sorted by starting
+    // address, so it will be possible to compact it with other blocks.
+
+    // Make space
+    memmove(&buffer[i + 4], &buffer[i], iend - i);
+
+    // And add the block
+    buffer[i] = address & 0xFF;
+    buffer[i + 1] = (address >> 8) & 0xFF;
+    buffer[i + 2] = 1;
+    buffer[i + 3] = data;
+
+    // Done!
+    return true;
+  }
+
+  // Not enough room to store this information on this FLASH page -  Perform a
+  // flush and override the address with the specified contents
+  return ee_Flush(address, data);
+}
+
+static void ee_Init() {
+
+  // Just init once!
+  if (curGroup != 0xFF) return;
+
+  // Clean up the SRAM buffer
+  memset(buffer, 0xFF, sizeof(buffer));
+
+  // Now, we must find out the group where settings are stored
+  for (curGroup = 0; curGroup < GroupCount; curGroup++)
+    if (!ee_IsPageClean(curGroup * PagesPerGroup)) break;
+
+  // If all groups seem to be used, default to first group
+  if (curGroup >= GroupCount) curGroup = 0;
+
+  DEBUG_ECHO_MSG("EEPROM Current Group: ",curGroup);
+  DEBUG_FLUSH();
+
+  // Now, validate that all the other group pages are empty
+  for (int grp = 0; grp < GroupCount; grp++) {
+    if (grp == curGroup) continue;
+
+    for (int page = 0; page < PagesPerGroup; page++) {
+      if (!ee_IsPageClean(grp * PagesPerGroup + page)) {
+        DEBUG_ECHO_MSG("EEPROM Page ", page, " not clean on group ", grp);
+        DEBUG_FLUSH();
+        ee_PageErase(grp * PagesPerGroup + page);
+      }
+    }
+  }
+
+  // Finally, for the active group, determine the first unused page
+  // and also validate that all the other ones are clean
+  for (curPage = 0; curPage < PagesPerGroup; curPage++) {
+    if (ee_IsPageClean(curGroup * PagesPerGroup + curPage)) {
+      ee_Dump(curGroup * PagesPerGroup + curPage, getFlashStorage(curGroup * PagesPerGroup + curPage));
+      break;
+    }
+  }
+
+  DEBUG_ECHO_MSG("EEPROM Active page: ", curPage);
+  DEBUG_FLUSH();
+
+  // Make sure the pages following the first clean one are also clean
+  for (int page = curPage + 1; page < PagesPerGroup; page++) {
+    if (!ee_IsPageClean(curGroup * PagesPerGroup + page)) {
+      DEBUG_ECHO_MSG("EEPROM Page ", page, " not clean on active group ", curGroup);
+      DEBUG_FLUSH();
+      ee_Dump(curGroup * PagesPerGroup + page, getFlashStorage(curGroup * PagesPerGroup + page));
+      ee_PageErase(curGroup * PagesPerGroup + page);
+    }
+  }
+}
+
+/* PersistentStore -----------------------------------------------------------*/
+
+#include "../../shared/eeprom_api.h"
+
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000 // 4KB
+#endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE - eeprom_exclude_size; }
+bool PersistentStore::access_start()  { ee_Init();  return true; }
+bool PersistentStore::access_finish() { ee_Flush(); return true; }
+
+bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
+  uint16_t written = 0;
+  while (size--) {
+    uint8_t * const p = (uint8_t * const)REAL_EEPROM_ADDR(pos);
+    uint8_t v = *value;
+    if (v != ee_Read(uint32_t(p))) { // EEPROM has only ~100,000 write cycles, so only write bytes that have changed!
+      ee_Write(uint32_t(p), v);
+      if (++written & 0x7F) delay(2); else safe_delay(2); // Avoid triggering watchdog during long EEPROM writes
+      if (ee_Read(uint32_t(p)) != v) {
+        SERIAL_ECHO_MSG(STR_ERR_EEPROM_WRITE);
+        return true;
+      }
+    }
+    crc16(crc, &v, 1);
+    pos++;
+    value++;
+  }
+  return false;
+}
+
+bool PersistentStore::read_data(int &pos, uint8_t *value, size_t size, uint16_t *crc, const bool writing/*=true*/) {
+  do {
+    uint8_t c = ee_Read(uint32_t(REAL_EEPROM_ADDR(pos)));
+    if (writing) *value = c;
+    crc16(crc, &c, 1);
+    pos++;
+    value++;
+  } while (--size);
+  return false;
+}
+
+#endif // FLASH_EEPROM_EMULATION
+#endif // ARDUINO_ARCH_SAM

Marlin/src/HAL/DUE/eeprom/eeprom_wired.cpp

@@ -0,0 +1,75 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#ifdef ARDUINO_ARCH_SAM
+
+#include "../../../inc/MarlinConfig.h"
+
+#if USE_WIRED_EEPROM
+
+/**
+ * PersistentStore for Arduino-style EEPROM interface
+ * with simple implementations supplied by Marlin.
+ */
+
+#include "../../shared/eeprom_if.h"
+#include "../../shared/eeprom_api.h"
+
+#ifndef MARLIN_EEPROM_SIZE
+  #error "MARLIN_EEPROM_SIZE is required for I2C / SPI EEPROM."
+#endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE - eeprom_exclude_size; }
+bool PersistentStore::access_start()  { eeprom_init(); return true; }
+bool PersistentStore::access_finish() { return true; }
+
+bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
+  uint16_t written = 0;
+  while (size--) {
+    uint8_t * const p = (uint8_t * const)REAL_EEPROM_ADDR(pos);
+    uint8_t v = *value;
+    if (v != eeprom_read_byte(p)) { // EEPROM has only ~100,000 write cycles, so only write bytes that have changed!
+      eeprom_write_byte(p, v);
+      if (++written & 0x7F) delay(2); else safe_delay(2); // Avoid triggering watchdog during long EEPROM writes
+      if (eeprom_read_byte(p) != v) {
+        SERIAL_ECHO_MSG(STR_ERR_EEPROM_WRITE);
+        return true;
+      }
+    }
+    crc16(crc, &v, 1);
+    pos++;
+    value++;
+  }
+  return false;
+}
+
+bool PersistentStore::read_data(int &pos, uint8_t *value, size_t size, uint16_t *crc, const bool writing/*=true*/) {
+  do {
+    const uint8_t c = eeprom_read_byte((uint8_t*)REAL_EEPROM_ADDR(pos));
+    if (writing) *value = c;
+    crc16(crc, &c, 1);
+    pos++;
+    value++;
+  } while (--size);
+  return false;
+}
+
+#endif // USE_WIRED_EEPROM
+#endif // ARDUINO_ARCH_SAM

Marlin/src/HAL/DUE/endstop_interrupts.h

@@ -0,0 +1,80 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * Endstop Interrupts
+ *
+ * Without endstop interrupts the endstop pins must be polled continually in
+ * the temperature-ISR via endstops.update(), most of the time finding no change.
+ * With this feature endstops.update() is called only when we know that at
+ * least one endstop has changed state, saving valuable CPU cycles.
+ *
+ * This feature only works when all used endstop pins can generate an 'external interrupt'.
+ *
+ * Test whether pins issue interrupts on your board by flashing 'pin_interrupt_test.ino'.
+ * (Located in Marlin/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino)
+ */
+
+#include "../../module/endstops.h"
+
+// One ISR for all EXT-Interrupts
+void endstop_ISR() { endstops.update(); }
+
+/**
+ *  Endstop interrupts for Due based targets.
+ *  On Due, all pins support external interrupt capability.
+ */
+
+void setup_endstop_interrupts() {
+  #define _ATTACH(P) attachInterrupt(digitalPinToInterrupt(P), endstop_ISR, CHANGE)
+  TERN_(USE_X_MAX,       _ATTACH(X_MAX_PIN));
+  TERN_(USE_X_MIN,       _ATTACH(X_MIN_PIN));
+  TERN_(USE_Y_MAX,       _ATTACH(Y_MAX_PIN));
+  TERN_(USE_Y_MIN,       _ATTACH(Y_MIN_PIN));
+  TERN_(USE_Z_MAX,       _ATTACH(Z_MAX_PIN));
+  TERN_(USE_Z_MIN,       _ATTACH(Z_MIN_PIN));
+  TERN_(USE_X2_MAX,      _ATTACH(X2_MAX_PIN));
+  TERN_(USE_X2_MIN,      _ATTACH(X2_MIN_PIN));
+  TERN_(USE_Y2_MAX,      _ATTACH(Y2_MAX_PIN));
+  TERN_(USE_Y2_MIN,      _ATTACH(Y2_MIN_PIN));
+  TERN_(USE_Z2_MAX,      _ATTACH(Z2_MAX_PIN));
+  TERN_(USE_Z2_MIN,      _ATTACH(Z2_MIN_PIN));
+  TERN_(USE_Z3_MAX,      _ATTACH(Z3_MAX_PIN));
+  TERN_(USE_Z3_MIN,      _ATTACH(Z3_MIN_PIN));
+  TERN_(USE_Z4_MAX,      _ATTACH(Z4_MAX_PIN));
+  TERN_(USE_Z4_MIN,      _ATTACH(Z4_MIN_PIN));
+  TERN_(USE_Z_MIN_PROBE, _ATTACH(Z_MIN_PROBE_PIN));
+  TERN_(USE_CALIBRATION, _ATTACH(CALIBRATION_PIN));
+  TERN_(USE_I_MAX,       _ATTACH(I_MAX_PIN));
+  TERN_(USE_I_MIN,       _ATTACH(I_MIN_PIN));
+  TERN_(USE_J_MAX,       _ATTACH(J_MAX_PIN));
+  TERN_(USE_J_MIN,       _ATTACH(J_MIN_PIN));
+  TERN_(USE_K_MAX,       _ATTACH(K_MAX_PIN));
+  TERN_(USE_K_MIN,       _ATTACH(K_MIN_PIN));
+  TERN_(USE_U_MAX,       _ATTACH(U_MAX_PIN));
+  TERN_(USE_U_MIN,       _ATTACH(U_MIN_PIN));
+  TERN_(USE_V_MAX,       _ATTACH(V_MAX_PIN));
+  TERN_(USE_V_MIN,       _ATTACH(V_MIN_PIN));
+  TERN_(USE_W_MAX,       _ATTACH(W_MAX_PIN));
+  TERN_(USE_W_MIN,       _ATTACH(W_MIN_PIN));
+}

Marlin/src/HAL/DUE/fastio.h

@@ -0,0 +1,565 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * Fast I/O Routines for SAM3X8E
+ * Use direct port manipulation to save scads of processor time.
+ * Contributed by Triffid_Hunter and modified by Kliment, thinkyhead, Bob-the-Kuhn, et.al.
+ */
+
+/**
+ * Description: Fast IO functions for Arduino Due and compatible (SAM3X8E)
+ *
+ * For ARDUINO_ARCH_SAM
+ * Note the code here was specifically crafted by disassembling what GCC produces
+ * out of it, so GCC is able to optimize it out as much as possible to the least
+ * amount of instructions. Be very careful if you modify them, as "clean code"
+ * leads to less efficient compiled code!!
+ */
+
+#include <pins_arduino.h>
+
+#include "../../inc/MarlinConfigPre.h"
+
+/**
+ * Utility functions
+ */
+
+// Due has 12 PWMs assigned to logical pins 2-13.
+// 6, 7, 8 & 9 come from the PWM controller. The others come from the timers.
+#define PWM_PIN(P)              WITHIN(P, 2, 13)
+
+#ifndef MASK
+  #define MASK(PIN) _BV(PIN)
+#endif
+
+/**
+ * Magic I/O routines
+ *
+ * Now you can simply SET_OUTPUT(STEP); WRITE(STEP, HIGH); WRITE(STEP, LOW);
+ *
+ * Why double up on these macros? see https://gcc.gnu.org/onlinedocs/cpp/Stringification.html
+ */
+
+// Read a pin
+#define _READ(IO) bool(DIO ## IO ## _WPORT -> PIO_PDSR & MASK(DIO ## IO ## _PIN))
+
+// Write to a pin
+#define _WRITE(IO,V) do { \
+  volatile Pio* port = (DIO ##  IO ## _WPORT); \
+  const uint32_t mask = MASK(DIO ## IO ## _PIN); \
+  if (V) port->PIO_SODR = mask; \
+  else port->PIO_CODR = mask; \
+}while(0)
+
+// Toggle a pin
+#define _TOGGLE(IO) _WRITE(IO, !READ(IO))
+
+#if MB(PRINTRBOARD_G2)
+
+  #include "fastio/G2_pins.h"
+
+  // Set pin as input
+  #define _SET_INPUT(IO) do{ \
+    pmc_enable_periph_clk(G2_g_APinDescription[IO].ulPeripheralId); \
+    PIO_Configure((DIO ## IO ## _WPORT), PIO_INPUT, MASK(DIO ## IO ## _PIN), 0); \
+  }while(0)
+
+  // Set pin as output
+  #define _SET_OUTPUT(IO) do{ \
+    uint32_t mask = MASK(G2_g_APinDescription[IO].ulPeripheralId); \
+    if ((PMC->PMC_PCSR0 & mask) != (mask)) PMC->PMC_PCER0 = mask; \
+    volatile Pio* port = (DIO ## IO ## _WPORT); \
+    mask = MASK(DIO ## IO ## _PIN); \
+    if (_READ(IO)) port->PIO_SODR = mask; \
+    else port->PIO_CODR = mask; \
+    port->PIO_IDR = mask; \
+    const uint32_t pin_config = G2_g_APinDescription[IO].ulPinConfiguration; \
+    if (pin_config & PIO_PULLUP) port->PIO_PUER = mask; \
+    else port->PIO_PUDR = mask; \
+    if (pin_config & PIO_OPENDRAIN) port->PIO_MDER = mask; \
+    else port->PIO_MDDR = mask; \
+    port->PIO_PER = mask; \
+    port->PIO_OER = mask; \
+    g_pinStatus[IO] = (g_pinStatus[IO] & 0xF0) | PIN_STATUS_DIGITAL_OUTPUT; \
+  }while(0)
+
+ /**
+  *  Set pin as output with comments
+  *  #define _SET_OUTPUT(IO) do{ \
+  *    uint32_t mask = MASK(G2_g_APinDescription[IO].ulPeripheralId); \
+  *    if ((PMC->PMC_PCSR0 & mask ) != (mask))  PMC->PMC_PCER0 = mask; \  // enable PIO clock if not already enabled
+  *
+  *    volatile Pio* port = (DIO ##  IO ## _WPORT); \
+  *    const uint32_t mask = MASK(DIO ## IO ## _PIN); \
+  *    if (_READ(IO)) port->PIO_SODR = mask; \ // set output to match input BEFORE setting direction or will glitch the output
+  *    else port->PIO_CODR = mask; \
+  *
+  *    port->PIO_IDR = mask; \ // disable interrupt
+  *
+  *    uint32_t pin_config = G2_g_APinDescription[IO].ulPinConfiguration; \
+  *    if (pin_config & PIO_PULLUP) pPio->PIO_PUER = mask; \  // enable pullup if necessary
+  *    else  pPio->PIO_PUDR = mask; \
+  *
+  *    if (pin_config & PIO_OPENDRAIN) port->PIO_MDER = mask; \ // Enable multi-drive if necessary
+  *    else  port->PIO_MDDR = mask; \
+  *
+  *    port->PIO_PER = mask; \
+  *    port->PIO_OER = mask; \  // set to output
+  *
+  *    g_pinStatus[IO] = (g_pinStatus[IO] & 0xF0) | PIN_STATUS_DIGITAL_OUTPUT; \
+  *  }while(0)
+  */
+
+#else
+
+    // Set pin as input
+  #define _SET_INPUT(IO) do{ \
+    pmc_enable_periph_clk(g_APinDescription[IO].ulPeripheralId); \
+    PIO_Configure(digitalPinToPort(IO), PIO_INPUT, digitalPinToBitMask(IO), 0); \
+  }while(0)
+
+  // Set pin as output
+  #define _SET_OUTPUT(IO) do{ \
+    pmc_enable_periph_clk(g_APinDescription[IO].ulPeripheralId); \
+    PIO_Configure(digitalPinToPort(IO), _READ(IO) ? PIO_OUTPUT_1 : PIO_OUTPUT_0, digitalPinToBitMask(IO), g_APinDescription[IO].ulPinConfiguration); \
+    g_pinStatus[IO] = (g_pinStatus[IO] & 0xF0) | PIN_STATUS_DIGITAL_OUTPUT; \
+  }while(0)
+#endif
+
+// Set pin as input with pullup mode
+#define _PULLUP(IO,V)        pinMode(IO, (V) ? INPUT_PULLUP : INPUT)
+
+// Read a pin (wrapper)
+#define READ(IO)             _READ(IO)
+
+// Write to a pin (wrapper)
+#define WRITE(IO,V)          _WRITE(IO,V)
+
+// Toggle a pin (wrapper)
+#define TOGGLE(IO)           _TOGGLE(IO)
+
+// Set pin as input (wrapper)
+#define SET_INPUT(IO)        _SET_INPUT(IO)
+// Set pin as input with pullup (wrapper)
+#define SET_INPUT_PULLUP(IO) do{ _SET_INPUT(IO); _PULLUP(IO, HIGH); }while(0)
+// Set pin as input with pulldown (substitution)
+#define SET_INPUT_PULLDOWN   SET_INPUT
+
+// Set pin as output (wrapper) -  reads the pin and sets the output to that value
+#define SET_OUTPUT(IO)       _SET_OUTPUT(IO)
+// Set pin as PWM
+#define SET_PWM               SET_OUTPUT
+
+// Check if pin is an input
+#define IS_INPUT(IO)         ((digitalPinToPort(IO)->PIO_OSR & digitalPinToBitMask(IO)) == 0)
+// Check if pin is an output
+#define IS_OUTPUT(IO)        ((digitalPinToPort(IO)->PIO_OSR & digitalPinToBitMask(IO)) != 0)
+
+// Shorthand
+#define OUT_WRITE(IO,V)      do{ SET_OUTPUT(IO); WRITE(IO,V); }while(0)
+
+// digitalRead/Write wrappers
+#define extDigitalRead(IO)    digitalRead(IO)
+#define extDigitalWrite(IO,V) digitalWrite(IO,V)
+
+/**
+ * Ports and functions
+ * Added as necessary or if I feel like it- not a comprehensive list!
+ */
+
+// UART
+#define RXD        0
+#define TXD        1
+
+// TWI (I2C)
+#define SCL        21
+#define SDA        20
+
+/**
+ * pins
+ */
+
+#define DIO0_PIN 8
+#define DIO0_WPORT PIOA
+
+#define DIO1_PIN 9
+#define DIO1_WPORT PIOA
+
+#define DIO2_PIN 25
+#define DIO2_WPORT PIOB
+
+#define DIO3_PIN 28
+#define DIO3_WPORT PIOC
+
+#define DIO4_PIN 26
+#define DIO4_WPORT PIOC
+
+#define DIO5_PIN 25
+#define DIO5_WPORT PIOC
+
+#define DIO6_PIN 24
+#define DIO6_WPORT PIOC
+
+#define DIO7_PIN 23
+#define DIO7_WPORT PIOC
+
+#define DIO8_PIN 22
+#define DIO8_WPORT PIOC
+
+#define DIO9_PIN 21
+#define DIO9_WPORT PIOC
+
+#define DIO10_PIN 29
+#define DIO10_WPORT PIOC
+
+#define DIO11_PIN 7
+#define DIO11_WPORT PIOD
+
+#define DIO12_PIN 8
+#define DIO12_WPORT PIOD
+
+#define DIO13_PIN 27
+#define DIO13_WPORT PIOB
+
+#define DIO14_PIN 4
+#define DIO14_WPORT PIOD
+
+#define DIO15_PIN 5
+#define DIO15_WPORT PIOD
+
+#define DIO16_PIN 13
+#define DIO16_WPORT PIOA
+
+#define DIO17_PIN 12
+#define DIO17_WPORT PIOA
+
+#define DIO18_PIN 11
+#define DIO18_WPORT PIOA
+
+#define DIO19_PIN 10
+#define DIO19_WPORT PIOA
+
+#define DIO20_PIN 12
+#define DIO20_WPORT PIOB
+
+#define DIO21_PIN 13
+#define DIO21_WPORT PIOB
+
+#define DIO22_PIN 26
+#define DIO22_WPORT PIOB
+
+#define DIO23_PIN 14
+#define DIO23_WPORT PIOA
+
+#define DIO24_PIN 15
+#define DIO24_WPORT PIOA
+
+#define DIO25_PIN 0
+#define DIO25_WPORT PIOD
+
+#define DIO26_PIN 1
+#define DIO26_WPORT PIOD
+
+#define DIO27_PIN 2
+#define DIO27_WPORT PIOD
+
+#define DIO28_PIN 3
+#define DIO28_WPORT PIOD
+
+#define DIO29_PIN 6
+#define DIO29_WPORT PIOD
+
+#define DIO30_PIN 9
+#define DIO30_WPORT PIOD
+
+#define DIO31_PIN 7
+#define DIO31_WPORT PIOA
+
+#define DIO32_PIN 10
+#define DIO32_WPORT PIOD
+
+#define DIO33_PIN 1
+#define DIO33_WPORT PIOC
+
+#if !MB(PRINTRBOARD_G2)    // normal DUE pin mapping
+
+  #define DIO34_PIN 2
+  #define DIO34_WPORT PIOC
+
+  #define DIO35_PIN 3
+  #define DIO35_WPORT PIOC
+
+  #define DIO36_PIN 4
+  #define DIO36_WPORT PIOC
+
+  #define DIO37_PIN 5
+  #define DIO37_WPORT PIOC
+
+  #define DIO38_PIN 6
+  #define DIO38_WPORT PIOC
+
+  #define DIO39_PIN 7
+  #define DIO39_WPORT PIOC
+
+  #define DIO40_PIN 8
+  #define DIO40_WPORT PIOC
+
+  #define DIO41_PIN 9
+  #define DIO41_WPORT PIOC
+
+#endif // !PRINTRBOARD_G2
+
+#define DIO42_PIN 19
+#define DIO42_WPORT PIOA
+
+#define DIO43_PIN 20
+#define DIO43_WPORT PIOA
+
+#define DIO44_PIN 19
+#define DIO44_WPORT PIOC
+
+#define DIO45_PIN 18
+#define DIO45_WPORT PIOC
+
+#define DIO46_PIN 17
+#define DIO46_WPORT PIOC
+
+#define DIO47_PIN 16
+#define DIO47_WPORT PIOC
+
+#define DIO48_PIN 15
+#define DIO48_WPORT PIOC
+
+#define DIO49_PIN 14
+#define DIO49_WPORT PIOC
+
+#define DIO50_PIN 13
+#define DIO50_WPORT PIOC
+
+#define DIO51_PIN 12
+#define DIO51_WPORT PIOC
+
+#define DIO52_PIN 21
+#define DIO52_WPORT PIOB
+
+#define DIO53_PIN 14
+#define DIO53_WPORT PIOB
+
+#define DIO54_PIN 16
+#define DIO54_WPORT PIOA
+
+#define DIO55_PIN 24
+#define DIO55_WPORT PIOA
+
+#define DIO56_PIN 23
+#define DIO56_WPORT PIOA
+
+#define DIO57_PIN 22
+#define DIO57_WPORT PIOA
+
+#define DIO58_PIN 6
+#define DIO58_WPORT PIOA
+
+#define DIO59_PIN 4
+#define DIO59_WPORT PIOA
+
+#define DIO60_PIN 3
+#define DIO60_WPORT PIOA
+
+#define DIO61_PIN 2
+#define DIO61_WPORT PIOA
+
+#define DIO62_PIN 17
+#define DIO62_WPORT PIOB
+
+#define DIO63_PIN 18
+#define DIO63_WPORT PIOB
+
+#define DIO64_PIN 19
+#define DIO64_WPORT PIOB
+
+#define DIO65_PIN 20
+#define DIO65_WPORT PIOB
+
+#define DIO66_PIN 15
+#define DIO66_WPORT PIOB
+
+#define DIO67_PIN 16
+#define DIO67_WPORT PIOB
+
+#define DIO68_PIN 1
+#define DIO68_WPORT PIOA
+
+#define DIO69_PIN 0
+#define DIO69_WPORT PIOA
+
+#define DIO70_PIN 17
+#define DIO70_WPORT PIOA
+
+#define DIO71_PIN 18
+#define DIO71_WPORT PIOA
+
+#define DIO72_PIN 30
+#define DIO72_WPORT PIOC
+
+#define DIO73_PIN 21
+#define DIO73_WPORT PIOA
+
+#define DIO74_PIN 25
+#define DIO74_WPORT PIOA
+
+#define DIO75_PIN 26
+#define DIO75_WPORT PIOA
+
+#define DIO76_PIN 27
+#define DIO76_WPORT PIOA
+
+#define DIO77_PIN 28
+#define DIO77_WPORT PIOA
+
+#define DIO78_PIN 23
+#define DIO78_WPORT PIOB
+
+#define DIO79_PIN 17
+#define DIO79_WPORT PIOA
+
+#define DIO80_PIN 12
+#define DIO80_WPORT PIOB
+
+#define DIO81_PIN 8
+#define DIO81_WPORT PIOA
+
+#define DIO82_PIN 11
+#define DIO82_WPORT PIOA
+
+#define DIO83_PIN 13
+#define DIO83_WPORT PIOA
+
+#define DIO84_PIN 4
+#define DIO84_WPORT PIOD
+
+#define DIO85_PIN 11
+#define DIO85_WPORT PIOB
+
+#define DIO86_PIN 21
+#define DIO86_WPORT PIOB
+
+#define DIO87_PIN 29
+#define DIO87_WPORT PIOA
+
+#define DIO88_PIN 15
+#define DIO88_WPORT PIOB
+
+#define DIO89_PIN 14
+#define DIO89_WPORT PIOB
+
+#define DIO90_PIN 1
+#define DIO90_WPORT PIOA
+
+#define DIO91_PIN 15
+#define DIO91_WPORT PIOB
+
+#ifdef ARDUINO_SAM_ARCHIM
+
+  #define DIO92_PIN 11
+  #define DIO92_WPORT PIOC
+
+  #define DIO93_PIN 2
+  #define DIO93_WPORT PIOB
+
+  #define DIO94_PIN 1
+  #define DIO94_WPORT PIOB
+
+  #define DIO95_PIN 0
+  #define DIO95_WPORT PIOB
+
+  #define DIO96_PIN 10
+  #define DIO96_WPORT PIOC
+
+  #define DIO97_PIN 24
+  #define DIO97_WPORT PIOB
+
+  #define DIO98_PIN 7
+  #define DIO98_WPORT PIOB
+
+  #define DIO99_PIN 6
+  #define DIO99_WPORT PIOB
+
+  #define DIO100_PIN 8
+  #define DIO100_WPORT PIOB
+
+  #define DIO101_PIN 5
+  #define DIO101_WPORT PIOB
+
+  #define DIO102_PIN 4
+  #define DIO102_WPORT PIOB
+
+  #define DIO103_PIN 3
+  #define DIO103_WPORT PIOB
+
+  #define DIO104_PIN 20
+  #define DIO104_WPORT PIOC
+
+  #define DIO105_PIN 22
+  #define DIO105_WPORT PIOB
+
+  #define DIO106_PIN 27
+  #define DIO106_WPORT PIOC
+
+  #define DIO107_PIN 10
+  #define DIO107_WPORT PIOB
+
+  #define DIO108_PIN 9
+  #define DIO108_WPORT PIOB
+
+#else // !ARDUINO_SAM_ARCHIM
+
+  #define DIO92_PIN 5
+  #define DIO92_WPORT PIOA
+
+  #define DIO93_PIN 12
+  #define DIO93_WPORT PIOB
+
+  #define DIO94_PIN 22
+  #define DIO94_WPORT PIOB
+
+  #define DIO95_PIN 23
+  #define DIO95_WPORT PIOB
+
+  #define DIO96_PIN 24
+  #define DIO96_WPORT PIOB
+
+  #define DIO97_PIN 20
+  #define DIO97_WPORT PIOC
+
+  #define DIO98_PIN 27
+  #define DIO98_WPORT PIOC
+
+  #define DIO99_PIN 10
+  #define DIO99_WPORT PIOC
+
+  #define DIO100_PIN 11
+  #define DIO100_WPORT PIOC
+
+#endif // !ARDUINO_SAM_ARCHIM

Marlin/src/HAL/DUE/fastio/G2_PWM.cpp

@@ -0,0 +1,208 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * The PWM module is only used to generate interrupts at specified times. It
+ * is NOT used to directly toggle pins. The ISR writes to the pin assigned to
+ * that interrupt.
+ *
+ * All PWMs use the same repetition rate.  The G2 needs about 10kHz min in order to
+ * not have obvious ripple on the Vref signals.
+ *
+ * The data structures are setup to minimize the computation done by the ISR which
+ * minimizes ISR execution time.  Execution times are 0.8 to 1.1 microseconds.
+ *
+ * FIve PWM interrupt sources are used.  Channel 0 sets the base period.  All Vref
+ * signals are set active when this counter overflows and resets to zero.  The compare
+ * values in channels 1-4 are set to give the desired duty cycle for that Vref pin.
+ * When counter 0 matches the compare value then that channel generates an interrupt.
+ * The ISR checks the source of the interrupt and sets the corresponding pin inactive.
+ *
+ * Some jitter in the Vref signal is OK so the interrupt priority is left at its default value.
+ */
+
+#include "../../../inc/MarlinConfigPre.h"
+
+#if MB(PRINTRBOARD_G2)
+
+#include "G2_PWM.h"
+#include "../../../module/stepper.h"
+
+#if PIN_EXISTS(MOTOR_CURRENT_PWM_X)
+  #define G2_PWM_X 1
+#else
+  #define G2_PWM_X 0
+#endif
+#if PIN_EXISTS(MOTOR_CURRENT_PWM_Y)
+  #define G2_PWM_Y 1
+#else
+  #define G2_PWM_Y 0
+#endif
+#if HAS_MOTOR_CURRENT_PWM_Z
+  #define G2_PWM_Z 1
+#else
+  #define G2_PWM_Z 0
+#endif
+#define G2_PWM_E HAS_MOTOR_CURRENT_PWM_E
+#define G2_MASK_X(V) (G2_PWM_X * (V))
+#define G2_MASK_Y(V) (G2_PWM_Y * (V))
+#define G2_MASK_Z(V) (G2_PWM_Z * (V))
+#define G2_MASK_E(V) (G2_PWM_E * (V))
+
+volatile uint32_t *SODR_A = &PIOA->PIO_SODR,
+                  *SODR_B = &PIOB->PIO_SODR,
+                  *CODR_A = &PIOA->PIO_CODR,
+                  *CODR_B = &PIOB->PIO_CODR;
+
+PWM_map ISR_table[NUM_PWMS] = PWM_MAP_INIT;
+
+void Stepper::digipot_init() {
+
+  #if G2_PWM_X
+    OUT_WRITE(MOTOR_CURRENT_PWM_X_PIN, LOW);  // init pins
+  #endif
+  #if G2_PWM_Y
+    OUT_WRITE(MOTOR_CURRENT_PWM_Y_PIN, LOW);
+  #endif
+  #if G2_PWM_Z
+    OUT_WRITE(MOTOR_CURRENT_PWM_Z_PIN, LOW);
+  #endif
+  #if G2_PWM_E
+    #if PIN_EXISTS(MOTOR_CURRENT_PWM_E)
+      OUT_WRITE(MOTOR_CURRENT_PWM_E_PIN, LOW);
+    #endif
+    #if PIN_EXISTS(MOTOR_CURRENT_PWM_E0)
+      OUT_WRITE(MOTOR_CURRENT_PWM_E0_PIN, LOW);
+    #endif
+  #endif
+
+  #define WPKEY          (0x50574D << 8) // “PWM” in ASCII
+  #define WPCMD_DIS_SW   0  // command to disable Write Protect SW
+  #define WPRG_ALL       (PWM_WPCR_WPRG0 | PWM_WPCR_WPRG1 | PWM_WPCR_WPRG2 | PWM_WPCR_WPRG3 | PWM_WPCR_WPRG4 | PWM_WPCR_WPRG5)  // all Write Protect Groups
+
+  #define PWM_CLOCK_F    F_CPU / 1000000UL   // set clock to 1MHz
+
+  PMC->PMC_PCER1 = PMC_PCER1_PID36;                       // enable PWM controller clock (disabled on power up)
+
+  PWM->PWM_WPCR = WPKEY | WPRG_ALL | WPCMD_DIS_SW;        // enable setting of all PWM registers
+  PWM->PWM_CLK = PWM_CLOCK_F;                             // enable CLK_A and set it to 1MHz, leave CLK_B disabled
+  PWM->PWM_CH_NUM[0].PWM_CMR = 0b1011;                    // set channel 0 to Clock A input & to left aligned
+  if (G2_PWM_X) PWM->PWM_CH_NUM[1].PWM_CMR = 0b1011;      // set channel 1 to Clock A input & to left aligned
+  if (G2_PWM_Y) PWM->PWM_CH_NUM[2].PWM_CMR = 0b1011;      // set channel 2 to Clock A input & to left aligned
+  if (G2_PWM_Z) PWM->PWM_CH_NUM[3].PWM_CMR = 0b1011;      // set channel 3 to Clock A input & to left aligned
+  if (G2_PWM_E) PWM->PWM_CH_NUM[4].PWM_CMR = 0b1011;      // set channel 4 to Clock A input & to left aligned
+
+  PWM->PWM_CH_NUM[0].PWM_CPRD = PWM_PERIOD_US;            // set channel 0 Period
+
+  PWM->PWM_IER2 = PWM_IER1_CHID0;                         // generate interrupt when counter0 overflows
+  PWM->PWM_IER2 = PWM_IER2_CMPM0
+    | G2_MASK_X(PWM_IER2_CMPM1)
+    | G2_MASK_Y(PWM_IER2_CMPM2)
+    | G2_MASK_Z(PWM_IER2_CMPM3)
+    | G2_MASK_E(PWM_IER2_CMPM4)
+  ; // generate interrupt on compare event
+
+  if (G2_PWM_X) PWM->PWM_CMP[1].PWM_CMPV = 0x010000000LL | G2_VREF_COUNT(G2_VREF(motor_current_setting[0])); // interrupt when counter0 == CMPV - used to set Motor 1 PWM inactive
+  if (G2_PWM_Y) PWM->PWM_CMP[2].PWM_CMPV = 0x010000000LL | G2_VREF_COUNT(G2_VREF(motor_current_setting[0])); // interrupt when counter0 == CMPV - used to set Motor 2 PWM inactive
+  if (G2_PWM_Z) PWM->PWM_CMP[3].PWM_CMPV = 0x010000000LL | G2_VREF_COUNT(G2_VREF(motor_current_setting[1])); // interrupt when counter0 == CMPV - used to set Motor 3 PWM inactive
+  if (G2_PWM_E) PWM->PWM_CMP[4].PWM_CMPV = 0x010000000LL | G2_VREF_COUNT(G2_VREF(motor_current_setting[2])); // interrupt when counter0 == CMPV - used to set Motor 4 PWM inactive
+
+  if (G2_PWM_X) PWM->PWM_CMP[1].PWM_CMPM = 0x0001;  // enable compare event
+  if (G2_PWM_Y) PWM->PWM_CMP[2].PWM_CMPM = 0x0001;  // enable compare event
+  if (G2_PWM_Z) PWM->PWM_CMP[3].PWM_CMPM = 0x0001;  // enable compare event
+  if (G2_PWM_E) PWM->PWM_CMP[4].PWM_CMPM = 0x0001;  // enable compare event
+
+  PWM->PWM_SCM = PWM_SCM_UPDM_MODE0 | PWM_SCM_SYNC0
+    | G2_MASK_X(PWM_SCM_SYNC1)
+    | G2_MASK_Y(PWM_SCM_SYNC2)
+    | G2_MASK_Z(PWM_SCM_SYNC3)
+    | G2_MASK_E(PWM_SCM_SYNC4)
+  ; // sync 1-4 with 0, use mode 0 for updates
+
+  PWM->PWM_ENA = PWM_ENA_CHID0
+    | G2_MASK_X(PWM_ENA_CHID1)
+    | G2_MASK_Y(PWM_ENA_CHID2)
+    | G2_MASK_Z(PWM_ENA_CHID3)
+    | G2_MASK_E(PWM_ENA_CHID4)
+  ; // enable channels used by G2
+
+  PWM->PWM_IER1 = PWM_IER1_CHID0
+    | G2_MASK_X(PWM_IER1_CHID1)
+    | G2_MASK_Y(PWM_IER1_CHID2)
+    | G2_MASK_Z(PWM_IER1_CHID3)
+    | G2_MASK_E(PWM_IER1_CHID4)
+  ; // enable interrupts for channels used by G2
+
+  NVIC_EnableIRQ(PWM_IRQn);     // Enable interrupt handler
+  NVIC_SetPriority(PWM_IRQn, NVIC_EncodePriority(0, 10, 0));  // normal priority for PWM module (can stand some jitter on the Vref signals)
+}
+
+void Stepper::set_digipot_current(const uint8_t driver, const int16_t current) {
+
+  if (!(PWM->PWM_CH_NUM[0].PWM_CPRD == PWM_PERIOD_US)) digipot_init();  // Init PWM system if needed
+
+  switch (driver) {
+    case 0:
+      if (G2_PWM_X) PWM->PWM_CMP[1].PWM_CMPVUPD = 0x010000000LL | G2_VREF_COUNT(G2_VREF(current));    // update X & Y
+      if (G2_PWM_Y) PWM->PWM_CMP[2].PWM_CMPVUPD = 0x010000000LL | G2_VREF_COUNT(G2_VREF(current));
+      if (G2_PWM_X) PWM->PWM_CMP[1].PWM_CMPMUPD = 0x0001;  // enable compare event
+      if (G2_PWM_Y) PWM->PWM_CMP[2].PWM_CMPMUPD = 0x0001;  // enable compare event
+      if (G2_PWM_X || G2_PWM_Y) PWM->PWM_SCUC = PWM_SCUC_UPDULOCK; // tell the PWM controller to update the values on the next cycle
+      break;
+    case 1:
+      if (G2_PWM_Z) {
+        PWM->PWM_CMP[3].PWM_CMPVUPD = 0x010000000LL | G2_VREF_COUNT(G2_VREF(current));    // update Z
+        PWM->PWM_CMP[3].PWM_CMPMUPD = 0x0001;  // enable compare event
+        PWM->PWM_SCUC = PWM_SCUC_UPDULOCK; // tell the PWM controller to update the values on the next cycle
+      }
+      break;
+    default:
+      if (G2_PWM_E) {
+        PWM->PWM_CMP[4].PWM_CMPVUPD = 0x010000000LL | G2_VREF_COUNT(G2_VREF(current));    // update E
+        PWM->PWM_CMP[4].PWM_CMPMUPD = 0x0001;  // enable compare event
+        PWM->PWM_SCUC = PWM_SCUC_UPDULOCK; // tell the PWM controller to update the values on the next cycle
+      }
+      break;
+  }
+}
+
+volatile uint32_t PWM_ISR1_STATUS, PWM_ISR2_STATUS;
+
+void PWM_Handler() {
+  PWM_ISR1_STATUS = PWM->PWM_ISR1;
+  PWM_ISR2_STATUS = PWM->PWM_ISR2;
+  if (PWM_ISR1_STATUS & PWM_IER1_CHID0) {                                                         // CHAN_0 interrupt
+    if (G2_PWM_X) *ISR_table[0].set_register = ISR_table[0].write_mask;                           // set X to active
+    if (G2_PWM_Y) *ISR_table[1].set_register = ISR_table[1].write_mask;                           // set Y to active
+    if (G2_PWM_Z) *ISR_table[2].set_register = ISR_table[2].write_mask;                           // set Z to active
+    if (G2_PWM_E) *ISR_table[3].set_register = ISR_table[3].write_mask;                           // set E to active
+  }
+  else {
+    if (G2_PWM_X && (PWM_ISR2_STATUS & PWM_IER2_CMPM1)) *ISR_table[0].clr_register = ISR_table[0].write_mask; // set X to inactive
+    if (G2_PWM_Y && (PWM_ISR2_STATUS & PWM_IER2_CMPM2)) *ISR_table[1].clr_register = ISR_table[1].write_mask; // set Y to inactive
+    if (G2_PWM_Z && (PWM_ISR2_STATUS & PWM_IER2_CMPM3)) *ISR_table[2].clr_register = ISR_table[2].write_mask; // set Z to inactive
+    if (G2_PWM_E && (PWM_ISR2_STATUS & PWM_IER2_CMPM4)) *ISR_table[3].clr_register = ISR_table[3].write_mask; // set E to inactive
+  }
+  return;
+}
+
+#endif // PRINTRBOARD_G2

Marlin/src/HAL/DUE/fastio/G2_PWM.h

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 #pragma once
@@ -26,10 +26,7 @@
  * PR #7500. It is hardwired for the PRINTRBOARD_G2 Motor Current needs.
  */
 
-#include "../../../inc/MarlinConfigPre.h"
-#include "../../../module/stepper.h"
-//C:\Users\bobku\Documents\GitHub\Marlin-Bob-2\Marlin\src\module\stepper.h
-//C:\Users\bobku\Documents\GitHub\Marlin-Bob-2\Marlin\src\HAL\HAL_DUE\G2_PWM.h
+#include <stdint.h>
 
 #define PWM_PERIOD_US  100  // base repetition rate in micro seconds
 
@@ -49,7 +46,6 @@ extern volatile uint32_t *SODR_A, *SODR_B, *CODR_A, *CODR_B;
 
 #define PWM_MAP_INIT_ROW(IO,ZZ) { ZZ == 'A' ? SODR_A : SODR_B,  ZZ == 'A' ? CODR_A : CODR_B, 1 << _PIN(IO) }
 
-
 #define PWM_MAP_INIT {  PWM_MAP_INIT_ROW(MOTOR_CURRENT_PWM_X_PIN, 'B'), \
                         PWM_MAP_INIT_ROW(MOTOR_CURRENT_PWM_Y_PIN, 'B'), \
                         PWM_MAP_INIT_ROW(MOTOR_CURRENT_PWM_Z_PIN, 'B'), \
@@ -63,7 +59,7 @@ extern PWM_map ISR_table[NUM_PWMS];
 extern uint32_t motor_current_setting[3];
 
 #define IR_BIT(p) (WITHIN(p, 0, 3) ? (p) : (p) + 4)
-#define COPY_ACTIVE_TABLE() do{ for (uint8_t i = 0; i < 6 ; i++) work_table[i] = active_table[i]; }while(0)
+#define COPY_ACTIVE_TABLE() do{ for (uint8_t i = 0; i < 6; ++i) work_table[i] = active_table[i]; }while(0)
 
 #define PWM_MR0 19999         // base repetition rate minus one count - 20mS
 #define PWM_PR 24             // prescaler value - prescaler divide by 24 + 1  -  1 MHz output

Marlin/src/HAL/DUE/fastio/G2_pins.h

@@ -16,7 +16,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 #pragma once
@@ -168,7 +168,6 @@ const G2_PinDescription G2_g_APinDescription[] = {
   { PIOB, PIO_PB21,          ID_PIOB, PIO_OUTPUT_0, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // PIN 52
   { PIOB, PIO_PB14,          ID_PIOB, PIO_OUTPUT_0, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // PIN 53
 
-
   // 54 .. 65 - Analog pins
   // ----------------------
   { PIOA, PIO_PA16X1_AD7,    ID_PIOA, PIO_INPUT,    PIO_DEFAULT, PIN_ATTR_ANALOG,                   ADC0,   ADC7,   NOT_ON_PWM,  NOT_ON_TIMER }, // AD0

Marlin/src/HAL/DUE/inc/Conditionals_LCD.h

@@ -0,0 +1,22 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once

Marlin/src/HAL/DUE/inc/Conditionals_adv.h

@@ -0,0 +1,22 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once

Marlin/src/HAL/DUE/inc/Conditionals_post.h

@@ -0,0 +1,28 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#if USE_FALLBACK_EEPROM
+  #define FLASH_EEPROM_EMULATION
+#elif ANY(I2C_EEPROM, SPI_EEPROM)
+  #define USE_SHARED_EEPROM 1
+#endif

Marlin/src/HAL/DUE/inc/Conditionals_type.h

@@ -0,0 +1,22 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2024 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once