<![CDATA[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]]>/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？

]]>https://bbs.aw-ol.com/topic/2603/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RSS for NodeFri, 17 Apr 2026 08:31:42 GMTMon, 21 Nov 2022 03:36:14 GMT60<![CDATA[Reply to 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 on Tue, 22 Nov 2022 05:15:43 GMT]]>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

]]>https://bbs.aw-ol.com/post/12332https://bbs.aw-ol.com/post/12332Tue, 22 Nov 2022 05:15:43 GMT