1、導出GPIO
echo 0 > /sys/class/gpio/export //允許操作GPIO0
2、GPIO作爲輸出
echo out > /sys/class/gpio/gpio0/direction //設置GPIO控制方向爲output
echo 0 > /sys/class/gpio/gpio0/value //控制GPIO0 輸出低電平
echo 1 > /sys/class/gpio/gpio0/value //控制GPIO0 輸出高電平
3、GPIO作爲輸入
echo in > /sys/class/gpio/gpio0/direction //設置GPIO控制方向爲input
cat /sys/class/gpio/gpio0/value //查看gpio0引腳輸入電平