RK3399-PWM
1 修改设备树,避免引脚占用
查看pwm引脚是否被复用成其他功能
2 用户态接口控制PWM(/sys/class/pwm)
设备树有几路pwm节点,/sys/class/pwm目录下就会生成几路pwmchipN。
echo 0 > /sys/class/pwm/pwmchip0/export
echo 0 > /sys/class/pwm/pwmchip0/unexport
echo normal > /sys/class/pwm/pwmchip0/pwm0/polarity
echo inversed > /sys/class/pwm/pwmchip0/pwm0/polarity
echo 1000 > /sys/class/pwm/pwmchip0/pwm0/period
echo 1000 > /sys/class/pwm/pwmchip0/pwm0/duty_cycle
echo 1 > /sys/class/pwm/pwmchip0/pwm0/enable
echo 0 > /sys/class/pwm/pwmchip0/pwm0/enable
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21