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loop_sdcard: Add loopable SD card file sections

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To support continuous belt printing, add nestable repeat
loop support via an `[sdcard_loop]` module.

Supported G-Code:
  - SDCARD_LOOP_BEGIN COUNT=n  ; Loop for N times, or infinitely if N is 0
  - SDCARD_LOOP_END            ; End of loop
  - SDCARD_LOOP_DESIST         ; Complete all loops without iterating

Marlin M808 compatibility example in `config/sample-macros.cfg`:
  - M808 Ln        ; Loop for N times, or infinitely if N is 0
  - M808           ; End of loop
  - M808 K         ; Complete all loops without iterating

Added unit tests in test/klippy/sdcard_loop.test

See https://reprap.org/wiki/G-code#M808:_Set_or_Goto_Repeat_Marker

Signed-off-by: Jason S. McMullan <jason.mcmullan@gmail.com>
This commit is contained in:
Jason S. McMullan 2021-04-17 06:54:12 -04:00 • committed by KevinOConnor
parent 4ea434796b
commit 913649de2e
8 changed files with 577 additions and 3 deletions
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14
docs/Config_Reference.md
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@ -1312,6 +1312,20 @@ path:
# be provided.
```
## [sdcard_loop]
Some printers with stage-clearing features, such as a part ejector or
a belt printer, can find use in looping sections of the sdcard file.
(For example, to print the same part over and over, or repeat the
a section of a part for a chain or other repeated pattern).
See the `config/sample-macros.cfg` file for a Marlin compatible M808
G-Code macro.
```
[sdcard_loop]
```
## [force_move]
Support manually moving stepper motors for diagnostic purposes. Note,