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# Support for PWM driven LEDs
#
# Copyright (C) 2019-2025 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging
from . import output_pin
# Helper code for common LED initialization and control
class LEDHelper:
def __init__(self, config, update_func, led_count=1):
self.printer = config.get_printer()
self.update_func = update_func
self.led_count = led_count
self.need_transmit = False
# Initial color
red = config.getfloat('initial_RED', 0., minval=0., maxval=1.)
green = config.getfloat('initial_GREEN', 0., minval=0., maxval=1.)
blue = config.getfloat('initial_BLUE', 0., minval=0., maxval=1.)
white = config.getfloat('initial_WHITE', 0., minval=0., maxval=1.)
self.led_state = [(red, green, blue, white)] * led_count
# Support setting an led template
self.template_eval = output_pin.lookup_template_eval(config)
self.tcallbacks = [(lambda text, s=self, index=i+1:
s._template_update(index, text))
for i in range(led_count)]
# Register commands
name = config.get_name().split()[-1]
gcode = self.printer.lookup_object('gcode')
gcode.register_mux_command("SET_LED", "LED", name, self.cmd_SET_LED,
desc=self.cmd_SET_LED_help)
gcode.register_mux_command("SET_LED_TEMPLATE", "LED", name,
self.cmd_SET_LED_TEMPLATE,
desc=self.cmd_SET_LED_TEMPLATE_help)
def get_status(self, eventtime=None):
return {'color_data': self.led_state}
def _set_color(self, index, color):
if index is None:
new_led_state = [color] * self.led_count
if self.led_state == new_led_state:
return
else:
if self.led_state[index - 1] == color:
return
new_led_state = list(self.led_state)
new_led_state[index - 1] = color
self.led_state = new_led_state
self.need_transmit = True
def _template_update(self, index, text):
try:
parts = [max(0., min(1., float(f)))
for f in text.split(',', 4)]
except ValueError as e:
logging.exception("led template render error")
parts = []
if len(parts) < 4:
parts += [0.] * (4 - len(parts))
self._set_color(index, tuple(parts))
def _check_transmit(self, print_time=None):
if not self.need_transmit:
return
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")
cmd_SET_LED_help = "Set the color of an LED"
def cmd_SET_LED(self, gcmd):
# Parse parameters
red = gcmd.get_float('RED', 0., minval=0., maxval=1.)
green = gcmd.get_float('GREEN', 0., minval=0., maxval=1.)
blue = gcmd.get_float('BLUE', 0., minval=0., maxval=1.)
white = gcmd.get_float('WHITE', 0., minval=0., maxval=1.)
index = gcmd.get_int('INDEX', None, minval=1, maxval=self.led_count)
transmit = gcmd.get_int('TRANSMIT', 1)
sync = gcmd.get_int('SYNC', 1)
color = (red, green, blue, white)
# Update and transmit data
def lookahead_bgfunc(print_time):
self._set_color(index, color)
if transmit:
self._check_transmit(print_time)
if sync:
#Sync LED Update with print time and send
toolhead = self.printer.lookup_object('toolhead')
toolhead.register_lookahead_callback(lookahead_bgfunc)
else:
#Send update now (so as not to wake toolhead and reset idle_timeout)
lookahead_bgfunc(None)
cmd_SET_LED_TEMPLATE_help = "Assign a display_template to an LED"
def cmd_SET_LED_TEMPLATE(self, gcmd):
index = gcmd.get_int("INDEX", None, minval=1, maxval=self.led_count)
set_template = self.template_eval.set_template
if index is not None:
set_template(gcmd, self.tcallbacks[index-1], self._check_transmit)
else:
for i in range(self.led_count):
set_template(gcmd, self.tcallbacks[i], self._check_transmit)
# Handler for PWM controlled LEDs
class PrinterPWMLED:
def __init__(self, config):
self.printer = printer = config.get_printer()
# Configure pwm pins
ppins = printer.lookup_object('pins')
max_duration = printer.lookup_object('mcu').max_nominal_duration()
cycle_time = config.getfloat('cycle_time', 0.010, above=0.,
maxval=max_duration)
hardware_pwm = config.getboolean('hardware_pwm', False)
self.pins = []
for i, name in enumerate(("red", "green", "blue", "white")):
pin_name = config.get(name + '_pin', None)
if pin_name is None:
continue
mcu_pin = ppins.setup_pin('pwm', pin_name)
mcu_pin.setup_max_duration(0.)
mcu_pin.setup_cycle_time(cycle_time, hardware_pwm)
self.pins.append((i, mcu_pin))
if not self.pins:
raise config.error("No LED pin definitions found in '%s'"
% (config.get_name(),))
self.last_print_time = 0.
# Initialize color data
self.led_helper = LEDHelper(config, self.update_leds, 1)
self.prev_color = color = self.led_helper.get_status()['color_data'][0]
for idx, mcu_pin in self.pins:
mcu_pin.setup_start_value(color[idx], 0.)
def update_leds(self, led_state, print_time):
mcu = self.pins[0][1].get_mcu()
min_sched_time = mcu.min_schedule_time()
if print_time is None:
eventtime = self.printer.get_reactor().monotonic()
print_time = mcu.estimated_print_time(eventtime) + min_sched_time
print_time = max(print_time, self.last_print_time + min_sched_time)
color = led_state[0]
for idx, mcu_pin in self.pins:
if self.prev_color[idx] != color[idx]:
mcu_pin.set_pwm(print_time, color[idx])
self.last_print_time = print_time
self.prev_color = color
def get_status(self, eventtime=None):
return self.led_helper.get_status(eventtime)
def load_config_prefix(config):
return PrinterPWMLED(config)
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