I am using PWM on a Xiao RA4M1 to control a RGB LED. I noticed that certain pins would cause the Xiao to disconnect from the computer when analogWrite was called. I would have to enter the Xiao into Bootloader mode to reconnect.
I used the PWM example from the RA4M1 Multiplexing Guide, https://wiki.seeedstudio.com/xiao_ra4m1_pin_multiplexing/ to check PWM on pins D0-D10.
PWM worked on D0, D5-D10. The issue was present on D1-D4.
The multiplexing guide says, “All GPIO pins on XIAO RA4M1 support PWM output. Therefore, you can use any pin to output PWM to adjust the brightness of lights, control servos, and other functions.”
Why wouldn’t PWM work on D1-D4?