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    按键按下用万用表测出电平变化, 但是查看对应GPIO的value文件却没有变化

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    • J
      jianwei LV 3 last edited by

      /sys/class/gpio # echo 37 > export 
      /sys/class/gpio # cd gpio37 
      /sys/devices/platform/soc@3000000/2000000.pinctrl/gpiochip0/gpio/gpio37 # cat direction 
      in
      /sys/devices/platform/soc@3000000/2000000.pinctrl/gpiochip0/gpio/gpio37 # cat active_low 
      0
      /sys/devices/platform/soc@3000000/2000000.pinctrl/gpiochip0/gpio/gpio37 # cat value 
      0
      /sys/devices/platform/soc@3000000/2000000.pinctrl/gpiochip0/gpio/gpio37 # cat value 
      0
      /sys/devices/platform/soc@3000000/2000000.pinctrl/gpiochip0/gpio/gpio37 # cat value 
      0
      /sys/devices/platform/soc@3000000/2000000.pinctrl/gpiochip0/gpio/gpio37 # 
      
      

      按键对应的GPIO 是 PB5

      请问需要怎么用程序检测按键状态变化呢?

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      • WhycanService
        WhycanService LV 8 last edited by

        按键可以用Linux内置的驱动gpio-keys,提供轮训中断等多种查询方式,而且直接对接了linux的event系统开发也很简单

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