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