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fix crash after lowering period in config file

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This commit is contained in:
Martin Sekera 2021-07-29 22:49:26 +02:00
parent 06e6069b53
commit 6a713c5b7e
1 changed files with 8 additions and 1 deletions
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9
fand.py
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@ -36,6 +36,7 @@ class PWM:
self.chip_base = "/sys/class/pwm/pwmchip%d/" %(chip) self.chip_base = "/sys/class/pwm/pwmchip%d/" %(chip)
self.ch_base = "/sys/class/pwm/pwmchip%d/pwm%d/" %(chip, ch) self.ch_base = "/sys/class/pwm/pwmchip%d/pwm%d/" %(chip, ch)
self.period = period self.period = period
self.duty_cycle = 0
# export the channel to sysfs if necessary # export the channel to sysfs if necessary
if not os.path.isdir(self.ch_base): if not os.path.isdir(self.ch_base):
@ -45,6 +46,9 @@ class PWM:
# disable channel # disable channel
self.set_enabled(False) self.set_enabled(False)
# set 0 duty cycle so period can be freely set
self.set_duty_cycle(0)
# set period & polarity # set period & polarity
with open(self.ch_base + "period", "w") as f: with open(self.ch_base + "period", "w") as f:
f.write(str(period)) f.write(str(period))
@ -71,7 +75,10 @@ class PWM:
f.write(requested) f.write(requested)
def set_percent(self, pc): def set_percent(self, pc):
self.duty_cycle = int(self.period * pc/100) self.set_duty_cycle(self.period * pc/100)
def set_duty_cycle(self, dc):
self.duty_cycle = int(dc)
self.f_dc.seek(0) self.f_dc.seek(0)
self.f_dc.write(str(self.duty_cycle)) self.f_dc.write(str(self.duty_cycle))
self.f_dc.flush() self.f_dc.flush()