PWM export: Permission denied

Hi, I'm trying to use the PWM from an application in python and I am following documentation to enable it http://www.udoo.org/docs-neo/Hardware_&_Accessories/PWM.html. The Step 1 I've done, but when export it in step 2, I do not have permissions. Thanks for the help.

Code:

echo 0 > /sys/class/pwm/pwmchip0/export
-bash: /sys/class/pwm/pwmchip0/export: Permission denied

sudo echo 0 > /sys/class/pwm/pwmchip0/export
-bash: /sys/class/pwm/pwmchip0/export: Permission denied

 

and if you use

Code:

sudo sh -c "echo 0 > /sys/class/pwm/pwmchip0/export"

If this works it looks like you have to do the same extra actions as for the other GPIO pins: GPIO through /sys/class but then for sys/class/pwm also

 

Hi @waltervl, thanks for your help this was the solution, it was a matter of adding the rule. Thanks