¶ pwm pin
Hot Wheels Technology has developed a rk3588s motherboard youyeetoo R1, which provides 40pin expansion pins, including 1 pwm pin. The pin distribution is shown in the figure below:
¶ shell command call
If you want to use shell commands in the Android system, you need to enter the Android command line window through ADB. For tutorials on using ADB, please refer to the adb debugging chapter. After opening the Android system command line through adb, you need to export the pwm device to user space first to operate the pwm pins.
- Switch to root user mode
su
- Enter the pwm configuration directory
cd /sys/class/pwm/pwmchip0/
- Export pwm device
echo 0 > export
- Configure pwm cycle
echo 10000 > period
- Configure duty cycle
echo 5000 > duty_cycle
- Enable pwm
echo 1 > enable