PWM in Torizon

Technical Support
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1

I am trying to test the PWM1(pwmchip2).
when doing sudo cat /sys/kernel/debug/pwm the specific device shows as null. how can this be enabled.

i tried exporting as per the document PWM (Linux) | Toradex Developer Center but i ger a permission denied error.

apalis-imx8-06738422:/sys/class/pwm/pwmchip2$ sudo echo 0 > export
-sh: export: Permission denied
2

had to call it like this. than permission denied error is not given. is this a bug in torizon or the normal way to use it ?

 sudo sh -c "echo 0 > /sys/class/pwm/pwmchip2/export"
3

Greetings @nkj,

As you’ve noticed there’s permissions to consider when trying to use certain interfaces on Torizon like PWM. The torizon user doesn’t have permissions to interact with many of these interfaces requiring sudo/root.

We have an article about how to use PWM in a container here: How to Use PWM on TorizonCore | Toradex Developer Center

Since you’re on Torizon I assume you’ll want to use PWM in a container with whatever application you’re developing.

Best Regards,
Jeremias