PWM behavior has changed

[ThHupk]

PWM frequency now defaults to 0. Used to be 1907. Programs now are obliged to set the frequency.

from machine import PWM
led = PWM('LED')
led.freq()
0

[ricksorensen]

See now closed pull request #10850. PWM behavior has been update to be more consistent between ports. I believe the default behavior is to not start PWM if freq/duty not specified.
#10850 (comment)

[robert-hh]

The only port which was not yet aligned is the ESP32 port. There is an open PR #10854 aligning most of the behavior. Only with this port PWM starts at a default frequency of 5000Hz, duty_u16=32768. All other ports now requires freq and duty rate to be set deliberately to get a signal.