NanoPC-T4 入門操作-2操作GPIO輸入輸出
阿新 • • 發佈:2018-12-12
GPIO輸出
[email protected]:/sys/class/gpio# echo 32 > export 匯出GPIO1_A0
[email protected]:/sys/class/gpio# ls
export gpio32 gpiochip128 gpiochip64 unexport
gpio156 gpiochip0 gpiochip32 gpiochip96
[email protected]:/sys/class/gpio# cd gpio32
[email protected]:/sys/class/gpio/gpio32# ls
active_low device direction edge power subsystem uevent value
[email protected]:/sys/class/gpio/gpio32# cat direction 檢視GPIO方向
in
[email protected]:/sys/class/gpio/gpio32# echo out > direction 設定GPIO為輸出
[email protected]:/sys/class/gpio/gpio32# echo 1 > value GPIO輸出高電平
[email protected]:/sys/class/gpio/gpio32# echo 0 > value GPIO輸出低電平
GPIO輸入
[email protected]:/sys/class/gpio# echo 33 > export 匯出GPIO1_A1
[email protected]:/sys/class/gpio# cd gpio33
[email protected]:/sys/class/gpio/gpio33# ls
active_low device direction edge power subsystem uevent value
[email protected]:/sys/class/gpio/gpio33# cat direction
in
[email protected] :/sys/class/gpio/gpio33# cat value 鬆開按鈕獲取的電平
1
[email protected]:/sys/class/gpio/gpio33# cat value 按下按鈕獲取的電平
0
亮燈效果