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# PWM and digital output pin handling
#
# Copyright (C) 2017-2024 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
PIN_MIN_TIME = 0.100
RESEND_HOST_TIME = 0.300 + PIN_MIN_TIME
MAX_SCHEDULE_TIME = 5.0
class PrinterOutputPin:
def __init__(self, config):
self.printer = config.get_printer()
ppins = self.printer.lookup_object('pins')
# Determine pin type
self.is_pwm = config.getboolean('pwm', False)
if self.is_pwm:
self.mcu_pin = ppins.setup_pin('pwm', config.get('pin'))
cycle_time = config.getfloat('cycle_time', 0.100, above=0.,
maxval=MAX_SCHEDULE_TIME)
hardware_pwm = config.getboolean('hardware_pwm', False)
self.mcu_pin.setup_cycle_time(cycle_time, hardware_pwm)
self.scale = config.getfloat('scale', 1., above=0.)
else:
self.mcu_pin = ppins.setup_pin('digital_out', config.get('pin'))
self.scale = 1.
self.last_print_time = 0.
# Support mcu checking for maximum duration
self.reactor = self.printer.get_reactor()
self.resend_timer = None
self.resend_interval = 0.
max_mcu_duration = config.getfloat('maximum_mcu_duration', 0.,
minval=0.500,
maxval=MAX_SCHEDULE_TIME)
self.mcu_pin.setup_max_duration(max_mcu_duration)
if max_mcu_duration:
config.deprecate('maximum_mcu_duration')
self.resend_interval = max_mcu_duration - RESEND_HOST_TIME
# Determine start and shutdown values
static_value = config.getfloat('static_value', None,
minval=0., maxval=self.scale)
if static_value is not None:
config.deprecate('static_value')
self.last_value = self.shutdown_value = static_value / self.scale
else:
self.last_value = config.getfloat(
'value', 0., minval=0., maxval=self.scale) / self.scale
self.shutdown_value = config.getfloat(
'shutdown_value', 0., minval=0., maxval=self.scale) / self.scale
self.mcu_pin.setup_start_value(self.last_value, self.shutdown_value)
# Register commands
pin_name = config.get_name().split()[1]
gcode = self.printer.lookup_object('gcode')
gcode.register_mux_command("SET_PIN", "PIN", pin_name,
self.cmd_SET_PIN,
desc=self.cmd_SET_PIN_help)
def get_status(self, eventtime):
return {'value': self.last_value}
def _set_pin(self, print_time, value, is_resend=False):
if value == self.last_value and not is_resend:
return
print_time = max(print_time, self.last_print_time + PIN_MIN_TIME)
if self.is_pwm:
self.mcu_pin.set_pwm(print_time, value)
else:
self.mcu_pin.set_digital(print_time, value)
self.last_value = value
self.last_print_time = print_time
if self.resend_interval and self.resend_timer is None:
self.resend_timer = self.reactor.register_timer(
self._resend_current_val, self.reactor.NOW)
cmd_SET_PIN_help = "Set the value of an output pin"
def cmd_SET_PIN(self, gcmd):
# Read requested value
value = gcmd.get_float('VALUE', minval=0., maxval=self.scale)
value /= self.scale
if not self.is_pwm and value not in [0., 1.]:
raise gcmd.error("Invalid pin value")
# Obtain print_time and apply requested settings
toolhead = self.printer.lookup_object('toolhead')
toolhead.register_lookahead_callback(
lambda print_time: self._set_pin(print_time, value))
def _resend_current_val(self, eventtime):
if self.last_value == self.shutdown_value:
self.reactor.unregister_timer(self.resend_timer)
self.resend_timer = None
return self.reactor.NEVER
systime = self.reactor.monotonic()
print_time = self.mcu_pin.get_mcu().estimated_print_time(systime)
time_diff = (self.last_print_time + self.resend_interval) - print_time
if time_diff > 0.:
# Reschedule for resend time
return systime + time_diff
self._set_pin(print_time + PIN_MIN_TIME, self.last_value, True)
return systime + self.resend_interval
def load_config_prefix(config):
return PrinterOutputPin(config)
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