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heater_fan: Improve timing of fan commands 

Don't use the reactor eventtime to schedule micro-controller commands
as that time may have low accuracy.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2020-12-01 11:46:43 -05:00
parent f90fbb56d2
commit a7e9050439
1 changed files with 10 additions and 5 deletions
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15
klippy/extras/heater_fan.py
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@ -17,22 +17,27 @@ class PrinterHeaterFan:
self.heaters = []
self.fan = fan.Fan(config, default_shutdown_speed=1.)
self.fan_speed = config.getfloat("fan_speed", 1., minval=0., maxval=1.)
self.last_speed = 0.
def handle_ready(self):
pheaters = self.printer.lookup_object('heaters')
self.heaters = [pheaters.lookup_heater(n.strip())
for n in self.heater_name.split(',')]
reactor = self.printer.get_reactor()
reactor.register_timer(self.callback, reactor.NOW)
reactor.register_timer(self.callback, reactor.monotonic()+PIN_MIN_TIME)
def get_status(self, eventtime):
return self.fan.get_status(eventtime)
def callback(self, eventtime):
power = 0.
speed = 0.
for heater in self.heaters:
current_temp, target_temp = heater.get_temp(eventtime)
if target_temp or current_temp > self.heater_temp:
power = self.fan_speed
print_time = self.fan.get_mcu().estimated_print_time(eventtime)
self.fan.set_speed(print_time + PIN_MIN_TIME, power)
speed = self.fan_speed
if speed == self.last_speed:
return
self.last_speed = speed
curtime = self.printer.get_reactor().monotonic()
print_time = self.fan.get_mcu().estimated_print_time(curtime)
self.fan.set_speed(print_time + PIN_MIN_TIME, speed)
return eventtime + 1.
def load_config_prefix(config):