Peripherals

GoogleGroups
1

I’m trying to use the Peripheral commands from:

https://github.com/beagleboard/pocketbeagle/wiki/Peripherals

I’m trying the PWM commands. When I get to

echo 20000 > ${ocp}/48300000.epwmss/48300200.pwm/pwm/pwmchip*/pwm0/period

I get permission denied. I tried adding sudo before echo and no joy.

Suggestions?

Thanks Andy

2

Right now do

https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Privileged_echo

We do have a better solution, which utilizes udev, but I haven’t back ported that to v4.9/v4.4 yet. (It requires fixes for bonescript still… I fixed adafruit library last week)

Regards,

3

Thanks!

Andy

4

If you need to use ‘sudo’ just prefixing it to your command won’t affect the redirection. Best to do this:

echo 20000 | sudo tee ${ocp}/48300000.epwmss/48300200.pwm/pwm/pwmchip*/pwm0/period