led: run update function as reactor callback

Update functions could be called within the flush/lookahead context
If the update function internally does pause()
That would lead to the unpredictable execution of time-critical functions

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>

klippy/extras/led.py

@@ -10,6 +10,7 @@ from . import output_pin
 class LEDHelper:
     def __init__(self, config, update_func, led_count=1):
         self.printer = config.get_printer()
+        self.mutex = self.printer.get_reactor().mutex()
         self.update_func = update_func
         self.led_count = led_count
         self.need_transmit = False
@@ -59,11 +60,16 @@ class LEDHelper:
     def _check_transmit(self, print_time=None):
         if not self.need_transmit:
             return
+        # Just avoid any race conditions
+        led_state = self.led_state
         self.need_transmit = False
-        try:
-            self.update_func(self.led_state, print_time)
-        except self.printer.command_error as e:
-            logging.exception("led update transmit error")
+        def reactor_cb(eventtime):
+            try:
+                with self.mutex:
+                    self.update_func(led_state, print_time)
+            except self.printer.command_error as e:
+                logging.exception("led update transmit error")
+        self.printer.get_reactor().register_callback(reactor_cb)
     cmd_SET_LED_help = "Set the color of an LED"
     def cmd_SET_LED(self, gcmd):
         # Parse parameters

klippy/extras/neopixel.py

@@ -16,7 +16,6 @@ MAX_MCU_SIZE = 500  # Sanity check on LED chain length
 class PrinterNeoPixel:
     def __init__(self, config):
         self.printer = printer = config.get_printer()
-        self.mutex = printer.get_reactor().mutex()
         # Configure neopixel
         ppins = printer.lookup_object('pins')
         pin_params = ppins.lookup_pin(config.get('pin'))
@@ -99,11 +98,8 @@ class PrinterNeoPixel:
         else:
             logging.info("Neopixel update did not succeed")
     def update_leds(self, led_state, print_time):
-        def reactor_bgfunc(eventtime):
-            with self.mutex:
-                self.update_color_data(led_state)
-                self.send_data(print_time)
-        self.printer.get_reactor().register_callback(reactor_bgfunc)
+        self.update_color_data(led_state)
+        self.send_data(print_time)
     def get_status(self, eventtime=None):
         return self.led_helper.get_status(eventtime)
 

klippy/extras/pca9533.py

@@ -27,7 +27,7 @@ class PCA9533:
         minclock = 0
         if print_time is not None:
             minclock = self.i2c.get_mcu().print_time_to_clock(print_time)
-        self.i2c.i2c_write_noack([PCA9533_PLS0, ls0], minclock=minclock,
+        self.i2c.i2c_write([PCA9533_PLS0, ls0], minclock=minclock,
                                  reqclock=BACKGROUND_PRIORITY_CLOCK)
     def get_status(self, eventtime):
         return self.led_helper.get_status(eventtime)

klippy/extras/pca9632.py

@@ -37,7 +37,7 @@ class PCA9632:
         if self.prev_regs.get(reg) == val:
             return
         self.prev_regs[reg] = val
-        self.i2c.i2c_write_noack([reg, val], minclock=minclock,
+        self.i2c.i2c_write([reg, val], minclock=minclock,
                                  reqclock=BACKGROUND_PRIORITY_CLOCK)
     def handle_connect(self):
         #Configure MODE1