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

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