Kevin O'Connor e60779bfe1 heater: Force set_pwm of zero when target_temp is zero ...

Fix a corner case where a residual in the PID could cause a non-zero
pwm request even when the target_temp is zero.  (Which could lead to a
firmware "Missed scheduling of next pwm event" shutdown.)

Simplify the logic for suppressing duplicate pwm updates and make sure
a zero target_temp always results in a zero pwm update on the
following set_pwm calculation.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

2017-03-16 12:49:15 -04:00

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