RK3568的GPIO如何使用

zyk

参考https://wiki.t-firefly.com/Core- ... io-yin-jiao-ji-suan，注意导出gpio是否被占用了。
假如157没被使用

1. :/ # ls /sys/class/gpio/
   
2. export     gpiochip128  gpiochip32   gpiochip64  unexport
   
3. gpiochip0  gpiochip255  gpiochip500  gpiochip96
   
4. :/ # echo 157 > /sys/class/gpio/export
   
5. :/ # ls /sys/class/gpio/
   
6. export   gpiochip0    gpiochip255  gpiochip500  gpiochip96
   
7. gpio157  gpiochip128  gpiochip32   gpiochip64   unexport
   
8. :/ # ls /sys/class/gpio/gpio157
   
9. active_low  device  direction  edge  power  subsystem  uevent  value
   
10. :/ # cat /sys/class/gpio/gpio157/direction
    
11. in
    
12. :/ # cat /sys/class/gpio/gpio157/value
    
13. 0
    
14. 
    
15. echo out >/sys/class/gpio/gpio157/direction
    
16. echo 1 >/sys/class/gpio/gpio157/value

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