mirror of https://github.com/Desuuuu/klipper.git
40 lines
1.5 KiB
Python
40 lines
1.5 KiB
Python
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# Printer fan support
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#
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# Copyright (C) 2016 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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FAN_MIN_TIME = 0.1
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class PrinterFan:
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def __init__(self, printer, config):
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self.printer = printer
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self.config = config
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self.mcu_fan = None
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self.last_fan_clock = self.last_fan_value = 0
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self.min_fan_clock = 0
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self.kick_start_clock = 0
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def build_config(self):
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pin = self.config.get('pin')
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hard_pwm = self.config.getint('hard_pwm', 128)
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mcu_freq = self.printer.mcu.get_mcu_freq()
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self.min_fan_clock = int(FAN_MIN_TIME * mcu_freq)
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kst = self.config.getfloat('kick_start_time', 0.1)
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self.kick_start_clock = int(kst * mcu_freq)
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self.mcu_fan = self.printer.mcu.create_pwm(pin, hard_pwm, 0)
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# External commands
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def set_speed(self, print_time, value):
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value = max(0, min(255, int(value*255. + 0.5)))
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if value == self.last_fan_value:
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return
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pc = int(self.mcu_fan.get_print_clock(print_time))
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pc = max(self.last_fan_clock + self.min_fan_clock, pc)
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if (value and value < 255
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and not self.last_fan_value and self.kick_start_clock):
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# Run fan at full speed for specified kick_start_time
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self.mcu_fan.set_pwm(pc, 255)
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pc += self.kick_start_clock
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self.mcu_fan.set_pwm(pc, value)
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self.last_fan_clock = pc
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self.last_fan_value = value
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