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# OpenIPC Wiki
[Table of Content](../README.md)
SigmaStar SoC research and debugging notes
------------------------------------------
#### Control PWM channels on SigmaStar SSC338Q
Switch GPIO1 to PWM1 mode and set parameters
```
devmem 0x1F207994 16 0x1121
echo 1 > /sys/class/pwm/pwmchip0/export
echo 10000 > /sys/class/pwm/pwmchip0/pwm1/period
echo 25 > /sys/class/pwm/pwmchip0/pwm1/duty_cycle
echo 1 > /sys/class/pwm/pwmchip0/pwm1/enable
```