PWM Frequency Set Does/Might Not Work

[mriksman]

FYI.

I'm working with the multipwm library of esp-open-rtos at the moment, porting it to ESP8266 RTOS SDK, and noticed the multipwm_set_freq() doesn't actually do anything.
https://github.com/RavenSystem/esp-homekit-devices/blob/master/devices/HAA/main.c#L4434

The actual frequency/period is set in the header with
#define MULTIPWM_MAX_PERIOD UINT16_MAX

multipwm_set_freq() will cause the divider to be set to TIMER_CLKDIV_16 (see https://github.com/SuperHouse/esp-open-rtos/blob/master/core/include/esp/timer.h)

So the frequency of the PWM calculates to about 76Hz. If a user selects a frequency > 100kHz, the divider will be TIMER_CLKDIV_1 so the PWM frequency will be 1.22kHz.
This is assuming the clock is running at 80MHz.

Is anyone able to confirm this?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[RavenSystem]

I use esp-open-rtos and multipwm_set_freq() works perfectly. I use 1KHz for max value.

[mriksman]

I spoke with the developer of multipwm and he confirmed he never implemented multipwm_set_freq properly. Record the LED with a slow-mo camera (like an iPhone) and you'll see it flashing.
nochkin/multipwm#5

[blaxwan01]

@RavenSystem any solution? any value of "q" in JSON becomes 76Hz on PWM, I tested a lot of tries with oscilloscope