PWM on Odroid

PWM ON THE ODROID

ODROID HAS 2 Hardware PWM output pins, 33 and 19.

To use the PWM output module, follow the instructions below:

1. First, start the PWM module in the kernel. Specify the number of PWM pins to use.

   sudo modprobe pwm-meson npwm=1 #USING 1 PWM PIN (33)

   Alternatively, to use both pins (33 and 19), run:

   #sudo modprobe pwm-meson npwm=2 #USING 1 PWM PIN (33, 19)

2. Begin the PWM control module in the kernel.

   # START PWM CONTROL
   sudo modprobe pwm-ctrl

3. Change directory to avoid supplying absolute paths.

   # CHANGE DIRECTORY
   cd /sys/devices/platform/pwm-ctrl

4. Set your parameters.

   export DUTY_CYCLE=102 # 0 ~ 1023
   export FREQUENCY=1024 # IN Hz, 0 ~ 1000000

5. Launch PWM.

   echo ${DUTY_CYCLE} > duty0
   echo 1 > enable0
   echo ${FREQUENCY} > freq0

6. When you're done, remove the loaded modules from the kernel.

   sudo modprobe -r pwm-ctrl
   sudo modprobe -r pwm-meson