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heaters: Reduce next_pwm_time window

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Commit 0f94f6c8 decreased the MAX_HEAT_TIME from 5 seconds to 3
seconds.  However, that also decreased the amount of tolerance for
lost temperature updates from 1.25 seconds to 0.75 seconds.  With the
default temperature update every 300ms, only 2 consecutive missing
temperature updates could lead to a fault.

Tweak the internal "next_pwm_time" setting so that it is more tolerant
of two consecutive lost temperature updates.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2025-08-12 09:33:52 -04:00
parent 371647109f
commit 2ddfa32dd8
1 changed files with 2 additions and 1 deletions
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3
klippy/extras/heaters.py
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@ -75,7 +75,8 @@ class Heater:
# No significant change in value - can suppress update
return
pwm_time = read_time + self.pwm_delay
self.next_pwm_time = pwm_time + 0.75 * MAX_HEAT_TIME
self.next_pwm_time = (pwm_time + MAX_HEAT_TIME
- (3. * self.pwm_delay + 0.001))
self.last_pwm_value = value
self.mcu_pwm.set_pwm(pwm_time, value)
#logging.debug("%s: pwm=%.3f@%.3f (from %.3f@%.3f [%.3f])",