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# Printer fan support
#
# Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
FAN_MIN_TIME = 0.1
class PrinterFan:
def __init__(self, printer, config):
self.printer = printer
self.config = config
self.mcu_fan = None
self.last_fan_clock = self.last_fan_value = 0
self.min_fan_clock = 0
self.kick_start_clock = 0
def build_config(self):
pin = self.config.get('pin')
hard_pwm = self.config.getint('hard_pwm', 128)
mcu_freq = self.printer.mcu.get_mcu_freq()
self.min_fan_clock = int(FAN_MIN_TIME * mcu_freq)
kst = self.config.getfloat('kick_start_time', 0.1)
self.kick_start_clock = int(kst * mcu_freq)
self.mcu_fan = self.printer.mcu.create_pwm(pin, hard_pwm, 0)
# External commands
def set_speed(self, print_time, value):
value = max(0, min(255, int(value*255. + 0.5)))
if value == self.last_fan_value:
return
pc = int(self.mcu_fan.get_print_clock(print_time))
pc = max(self.last_fan_clock + self.min_fan_clock, pc)
if (value and value < 255
and not self.last_fan_value and self.kick_start_clock):
# Run fan at full speed for specified kick_start_time
self.mcu_fan.set_pwm(pc, 255)
pc += self.kick_start_clock
self.mcu_fan.set_pwm(pc, value)
self.last_fan_clock = pc
self.last_fan_value = value
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