From 1fdf0ebaf4da3f4149c6d50ce2561f3bbc60ad56 Mon Sep 17 00:00:00 2001
From: Timofey Titovets <nefelim4ag@gmail.com>
Date: Thu, 16 Oct 2025 19:28:19 +0200
Subject: [PATCH] static_pwm_clock: define module for stm32

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
---
 klippy/extras/static_pwm_clock.py | 47 +++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 klippy/extras/static_pwm_clock.py

diff --git a/klippy/extras/static_pwm_clock.py b/klippy/extras/static_pwm_clock.py
new file mode 100644
index 000000000..db62af88b
--- /dev/null
+++ b/klippy/extras/static_pwm_clock.py
@@ -0,0 +1,47 @@
+# Define GPIO as clock output
+#
+# Copyright (C) 2025  Timofey Titovets <nefelim4ag@gmail.com>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+
+import logging
+
+class PrinterClockOutputPin:
+    def __init__(self, config):
+        self.name = config.get_name()
+        self.printer = config.get_printer()
+        ppins = self.printer.lookup_object('pins')
+        mcu_pin = ppins.lookup_pin(config.get('pin'), can_invert=True)
+        self.mcu = mcu_pin["chip"]
+        self.pin = mcu_pin["pin"]
+        self.invert = mcu_pin["invert"]
+        self.frequency = config.getfloat('frequency', 100, above=(1/0.3),
+                                          maxval=520000000)
+        self.mcu.register_config_callback(self._build_config)
+    def _build_config(self):
+        self.mcu.lookup_command(
+            "stm32_timer_output pin=%u cycle_ticks=%u on_ticks=%hu")
+        mcu_freq = self.mcu.seconds_to_clock(1.0)
+        cycle_ticks = int(mcu_freq // self.frequency)
+        # validate frequency
+        mcu_freq_rev = int(cycle_ticks * self.frequency)
+        if mcu_freq_rev != mcu_freq:
+            msg = """
+            # Frequency output must be without remainder, %i != %i
+            [%s]
+            frequency = %f
+            """ % (mcu_freq, mcu_freq_rev, self.name, self.frequency)
+            raise self.printer.config_error(msg)
+        value = int(0.5 * cycle_ticks)
+        if self.invert:
+            value = cycle_ticks - value
+        if value/cycle_ticks < 0.4:
+            logging.warning("[%s] pulse width < 40%%" % (self.name))
+        if value/cycle_ticks > 0.6:
+            logging.warning("[%s] pulse width > 60%%" % (self.name))
+        self.mcu.add_config_cmd(
+            "stm32_timer_output pin=%s cycle_ticks=%d on_ticks=%d"
+            % (self.pin, cycle_ticks, value))
+
+def load_config_prefix(config):
+    return PrinterClockOutputPin(config)