Pi4 PWM frequency wrong about go-rpio HOT 2 CLOSED

Ah yes, you are correct about the 100. I thought SetFreq was fixed, and the second DutyCycle param was just to make it a bit more simple to use as percentages, but now that I think about it, it makes sense I guess.
I will check if I can do a PR. Not familiar with the code at all, but shouldn't be too hard I guess.

from go-rpio.

Hi @b3nn0,
you are right about the oscillator frequency. There should be some check in the init function to determine the correct version and set the correct oscillator frequency.

But did you really get a higher output frequency by lowering the source frequency? That is weird, are you sure about that?
It should IMHO be 54000000, not 540000. You have to take into account the effect of DuctyCycle - the second param of DutyCycle effectively divides the source frequency. You probably had it set to 100, so you should have also multiplied the desired output frequency by 100 before passing it to the Freq function for it to work as intended.

Do you think you could create a PR for that? Unfortunately, I don't have access to working Pi4 now by myself.

from go-rpio.