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output_pin: Make sure to not use a cycle_time or max_duration over 5 seconds 

Times longer than 5 seconds may result in a 32bit ticks overflow in
the micro-controller (for fast micro-controllers).

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2021-03-26 11:37:40 -04:00
parent 861144d884
commit d02c80ef08
1 changed files with 8 additions and 5 deletions
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13
klippy/extras/output_pin.py
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@ -1,11 +1,12 @@
# Code to configure miscellaneous chips
#
# Copyright (C) 2017-2020 Kevin O'Connor <kevin@koconnor.net>
# Copyright (C) 2017-2021 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
PIN_MIN_TIME = 0.100
RESEND_HOST_TIME = 0.300 + PIN_MIN_TIME
MAX_SCHEDULE_TIME = 5.0
class PrinterOutputPin:
def __init__(self, config):
@ -14,7 +15,8 @@ class PrinterOutputPin:
self.is_pwm = config.getboolean('pwm', False)
if self.is_pwm:
self.mcu_pin = ppins.setup_pin('pwm', config.get('pin'))
cycle_time = config.getfloat('cycle_time', 0.100, above=0.)
cycle_time = config.getfloat('cycle_time', 0.100, above=0.,
maxval=MAX_SCHEDULE_TIME)
hardware_pwm = config.getboolean('hardware_pwm', False)
self.mcu_pin.setup_cycle_time(cycle_time, hardware_pwm)
self.scale = config.getfloat('scale', 1., above=0.)
@ -35,8 +37,9 @@ class PrinterOutputPin:
self.mcu_pin.setup_start_value(
self.last_value, self.last_value, True)
else:
max_mcu_duration = config.getfloat('maximum_mcu_duration',
0., minval=0.500)
max_mcu_duration = config.getfloat('maximum_mcu_duration', 0.,
minval=0.500,
maxval=MAX_SCHEDULE_TIME)
self.mcu_pin.setup_max_duration(max_mcu_duration)
self.resend_interval = max_mcu_duration - RESEND_HOST_TIME
@ -72,7 +75,7 @@ class PrinterOutputPin:
value = gcmd.get_float('VALUE', minval=0., maxval=self.scale)
value /= self.scale
cycle_time = gcmd.get_float('CYCLE_TIME', self.default_cycle_time,
above=0.)
above=0., maxval=MAX_SCHEDULE_TIME)
if not self.is_pwm and value not in [0., 1.]:
raise gcmd.error("Invalid pin value")
toolhead = self.printer.lookup_object('toolhead')