fan: Add tachometer support
This adds new config options for fans: 'tachometer_pin' to specify the GPIO pin, and 'tachometer_ppr' (default 2) to specify the number of signal pulses per revolution. The rpm is also exposed by get_status for command templates and the API server. For fast fans (at least 10000 RPM), the polling interval can be shortened using the 'tachometer_poll_interval' option. There is a new mcu object for a generic edge counter, which repeatedly polls a GPIO pin and periodically reports the count to the host. Signed-off-by: Adrian Keet <arkeet@gmail.com>
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@ -2226,6 +2226,19 @@ pin:
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# input speed which reliably drives the fan without stalls. Set
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# off_below to the duty cycle corresponding to this value (for
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# example, 12% -> 0.12) or slightly higher.
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#tachometer_pin:
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# Tachometer input pin for monitoring fan speed. A pullup is generally
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# required. This parameter is optional.
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#tachometer_ppr: 2
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# When tachometer_pin is specified, this is the number of pulses per
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# revolution of the tachometer signal. For a BLDC fan this is
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# normally half the number of poles. The default is 2.
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#tachometer_poll_interval: 0.0015
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# When tachometer_pin is specified, this is the polling period of the
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# tachometer pin, in seconds. The default is 0.0015, which is fast
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# enough for fans below 10000 RPM at 2 PPR. This must be smaller than
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# 30/(tachometer_ppr*rpm), with some margin, where rpm is the
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# maximum speed (in RPM) of the fan.
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```
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## [heater_fan]
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@ -2244,6 +2257,9 @@ a shutdown_speed equal to max_power.
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#hardware_pwm:
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#kick_start_time:
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#off_below:
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#tachometer_pin:
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#tachometer_ppr:
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#tachometer_poll_interval:
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# See the "fan" section for a description of the above parameters.
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#heater: extruder
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# Name of the config section defining the heater that this fan is
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@ -2277,6 +2293,9 @@ watched component.
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#hardware_pwm:
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#kick_start_time:
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#off_below:
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#tachometer_pin:
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#tachometer_ppr:
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#tachometer_poll_interval:
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# See the "fan" section for a description of the above parameters.
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#fan_speed: 1.0
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# The fan speed (expressed as a value from 0.0 to 1.0) that the fan
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@ -2317,6 +2336,9 @@ additional information.
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#hardware_pwm:
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#kick_start_time:
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#off_below:
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#tachometer_pin:
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#tachometer_ppr:
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#tachometer_poll_interval:
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# See the "fan" section for a description of the above parameters.
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#sensor_type:
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#sensor_pin:
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@ -2362,6 +2384,9 @@ with the SET_FAN_SPEED
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#hardware_pwm:
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#kick_start_time:
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#off_below:
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#tachometer_pin:
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#tachometer_ppr:
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#tachometer_poll_interval:
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# See the "fan" section for a description of the above parameters.
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```
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@ -3,6 +3,7 @@
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# Copyright (C) 2016-2020 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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import pulse_counter
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FAN_MIN_TIME = 0.100
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@ -11,6 +12,7 @@ class Fan:
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self.printer = config.get_printer()
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self.last_fan_value = 0.
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self.last_fan_time = 0.
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self.rpm = None
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# Read config
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self.max_power = config.getfloat('max_power', 1., above=0., maxval=1.)
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self.kick_start_time = config.getfloat('kick_start_time', 0.1,
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@ -28,9 +30,14 @@ class Fan:
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self.mcu_fan.setup_cycle_time(cycle_time, hardware_pwm)
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shutdown_power = max(0., min(self.max_power, shutdown_speed))
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self.mcu_fan.setup_start_value(0., shutdown_power)
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# Setup tachometer
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self.tachometer = FanTachometer(config)
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# Register callbacks
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self.printer.register_event_handler("gcode:request_restart",
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self._handle_request_restart)
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def get_mcu(self):
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return self.mcu_fan.get_mcu()
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def set_speed(self, print_time, value):
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@ -54,8 +61,34 @@ class Fan:
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self.set_speed(pt, value)))
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def _handle_request_restart(self, print_time):
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self.set_speed(print_time, 0.)
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def get_status(self, eventtime):
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return {'speed': self.last_fan_value}
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tachometer_status = self.tachometer.get_status(eventtime)
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return {
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'speed': self.last_fan_value,
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'rpm': tachometer_status['rpm'],
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}
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class FanTachometer:
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def __init__(self, config):
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printer = config.get_printer()
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self._freq_counter = None
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pin = config.get('tachometer_pin', None)
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if pin is not None:
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self.ppr = config.getint('tachometer_ppr', 2, minval=1)
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poll_time = config.getfloat('tachometer_poll_interval',
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0.0015, above=0.)
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sample_time = 1.
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self._freq_counter = pulse_counter.FrequencyCounter(
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printer, pin, sample_time, poll_time)
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def get_status(self, eventtime):
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if self._freq_counter:
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rpm = self._freq_counter.frequency * 30. / self.ppr
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else:
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rpm = None
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return {'rpm': rpm}
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class PrinterFan:
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def __init__(self, config):
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@ -0,0 +1,79 @@
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# Support for GPIO input edge counters
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#
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# Copyright (C) 2021 Adrian Keet <arkeet@gmail.com>
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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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class MCU_counter:
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def __init__(self, printer, pin, sample_time, poll_time):
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ppins = printer.lookup_object('pins')
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pin_params = ppins.lookup_pin(pin, can_pullup=True)
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self._mcu = pin_params['chip']
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self._oid = self._mcu.create_oid()
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self._pin = pin_params['pin']
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self._pullup = pin_params['pullup']
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self._poll_time = poll_time
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self._sample_time = sample_time
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self._callback = None
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self._last_count = 0
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self._mcu.register_config_callback(self.build_config)
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def build_config(self):
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self._mcu.add_config_cmd("config_counter oid=%d pin=%s pull_up=%d"
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% (self._oid, self._pin, self._pullup))
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clock = self._mcu.get_query_slot(self._oid)
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poll_ticks = self._mcu.seconds_to_clock(self._poll_time)
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sample_ticks = self._mcu.seconds_to_clock(self._sample_time)
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self._mcu.add_config_cmd(
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"query_counter oid=%d clock=%d poll_ticks=%d sample_ticks=%d"
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% (self._oid, clock, poll_ticks, sample_ticks), is_init=True)
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self._mcu.register_response(self._handle_counter_state,
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"counter_state", self._oid)
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# Callback is called periodically every sample_time
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def setup_callback(self, cb):
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self._callback = cb
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def _handle_counter_state(self, params):
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clock = self._mcu.clock32_to_clock64(params['time'])
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time = self._mcu.clock_to_print_time(clock)
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count_clock = self._mcu.clock32_to_clock64(params['count_time'])
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count_time = self._mcu.clock_to_print_time(count_clock)
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# handle 32-bit counter overflow
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last_count = self._last_count
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delta_count = (params['count'] - last_count) & 0xffffffff
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count = last_count + delta_count
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self._last_count = count
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if self._callback is not None:
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self._callback(time, count, count_time)
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class FrequencyCounter:
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def __init__(self, printer, pin, sample_time, poll_time):
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self._callback = None
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self._last_time = self._last_count = None
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self._freq = 0.
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self._counter = MCU_counter(printer, pin, sample_time, poll_time)
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self._counter.setup_callback(self._counter_callback)
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def _counter_callback(self, time, count, count_time):
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if self._last_time is None: # First sample
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self._last_time = time
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else:
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delta_time = count_time - self._last_time
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if delta_time > 0:
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self._last_time = count_time
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delta_count = count - self._last_count
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self._freq = delta_count / delta_time
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else: # No counts since last sample
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self._last_time = time
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self._freq = 0.
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if self._callback is not None:
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self._callback(time, self._freq)
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self._last_count = count
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@property
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def frequency(self):
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return self._freq
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@ -7,4 +7,4 @@ src-$(CONFIG_HAVE_GPIO_SPI) += spicmds.c thermocouple.c
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src-$(CONFIG_HAVE_GPIO_I2C) += i2ccmds.c
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src-$(CONFIG_HAVE_GPIO_HARD_PWM) += pwmcmds.c
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src-$(CONFIG_HAVE_GPIO_BITBANGING) += lcd_st7920.c lcd_hd44780.c buttons.c \
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tmcuart.c spi_software.c neopixel.c sensor_adxl345.c
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tmcuart.c spi_software.c neopixel.c sensor_adxl345.c pulse_counter.c
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@ -0,0 +1,99 @@
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// Commands for counting edges on GPIO input pins
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//
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// Copyright (C) 2021 Adrian Keet <arkeet@gmail.com>
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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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#include "basecmd.h" // oid_alloc
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#include "board/gpio.h" // struct gpio_in
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#include "board/irq.h" // irq_disable
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#include "board/misc.h" // timer_read_time
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#include "command.h" // DECL_COMMAND
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#include "sched.h" // DECL_TASK
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struct counter {
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struct timer timer;
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uint32_t poll_ticks;
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uint32_t sample_ticks, next_sample_time;
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uint32_t count, last_count_time;
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uint8_t flags;
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struct gpio_in pin;
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};
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enum {
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CF_PENDING = 1,
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};
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static struct task_wake counter_wake;
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static uint_fast8_t
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counter_event(struct timer *timer)
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{
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struct counter *c = container_of(timer, struct counter, timer);
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uint32_t time = c->timer.waketime;
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uint8_t last_value = c->count & 1;
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uint8_t value = gpio_in_read(c->pin);
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if (last_value != value) {
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c->count++;
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c->last_count_time = time;
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}
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// useful invariant: c->count & 1 == value
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if (timer_is_before(c->next_sample_time, time)) {
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c->flags |= CF_PENDING;
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c->next_sample_time = time + c->sample_ticks;
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sched_wake_task(&counter_wake);
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}
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c->timer.waketime += c->poll_ticks;
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return SF_RESCHEDULE;
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}
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void
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command_config_counter(uint32_t *args)
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{
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struct counter *c = oid_alloc(
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args[0], command_config_counter, sizeof(*c));
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c->pin = gpio_in_setup(args[1], args[2]);
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c->timer.func = counter_event;
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}
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DECL_COMMAND(command_config_counter,
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"config_counter oid=%c pin=%u pull_up=%c");
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void
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command_query_counter(uint32_t *args)
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{
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struct counter *c = oid_lookup(args[0], command_config_counter);
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sched_del_timer(&c->timer);
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c->timer.waketime = args[1];
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c->poll_ticks = args[2];
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c->sample_ticks = args[3];
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c->next_sample_time = c->timer.waketime; // sample immediately
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sched_add_timer(&c->timer);
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}
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DECL_COMMAND(command_query_counter,
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"query_counter oid=%c clock=%u poll_ticks=%u sample_ticks=%u");
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void
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counter_task(void)
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{
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if (!sched_check_wake(&counter_wake))
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return;
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uint8_t oid;
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struct counter *c;
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foreach_oid(oid, c, command_config_counter) {
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if (!(c->flags & CF_PENDING))
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continue;
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irq_disable();
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uint32_t time = c->timer.waketime - c->poll_ticks;
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uint32_t count = c->count;
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uint32_t count_time = c->last_count_time;
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c->flags &= ~CF_PENDING;
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irq_enable();
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sendf("counter_state oid=%c time=%u count=%u count_time=%u",
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oid, time, count, count_time);
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}
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}
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DECL_TASK(counter_task);
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