raspberry pi4 can't output PWM through upm

[Hansen0314]

when i run demo https://github.com/intel-iot-devkit/upm/blob/master/examples/python/buzzer.py that modify the pin to 12 .Then that not make Buzzer play any sound. how can i do something

[zhoukaidev]

Hi @Hansoncc
It seems like that the MRAA does not support PI4 currently.

[Propanu]

There's a PR for the initial PI4 boards open here. You would have to build MRAA from source to try it though, and as far as I remember it was for the first revision of the PI4 so it might not work if you have a newer one.

[rzr]

It's merged so please confirm this issue is still present,

Relate-to: eclipse/mraa#975 (comment)