Question about 500Hz Maximum PWM Frequency

[tonysmith55]

Hello, Thanks for creating a great library, particularly its non-blocking feature.

I understand controllers and interrupt driven timers but don't have experience with the ESP32 family to fully understand its features and limitations.

Do you see a problem with extending the maximum frequency from 500Hz to 1,000Hz?

My simple testing seems to suggest it works but I don't have access to an Oscilloscope at the moment to confirm both the frequency and waveform.

[khoih-prog]

Thanks for your interest in the library and nice words.
The max 500Hz is just a conservative frequency to be sure there is no issue, but I think you can use up to multi 1000Hz or a little bit more w/o any issue, depending on how many PWM channels you're using.

To test using higher freq., you can modify this line ESP32_PWM_ISR.h#L110 to

if ( ( frequency > 0 ) )

from

if ( ( frequency > 0 ) && ( frequency <= 500 ) )

Having fun testing,