这是本文档旧的修订版！

---

1. 输入命令evtest 查看系统下所有按键、输入设备：

root@rk3399:~# evtest 
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:	ff420030.pwm
/dev/input/event1:	USB Optical Wheel Mouse
/dev/input/event2:	SIGMACH1P USB Keyboard
/dev/input/event3:	rk29-keypad
/dev/input/event4:	SIGMACH1P USB Keyboard
Select the device event number [0-4]: 

2. 按照上面提示选择测试按键，如RK3399 boot按键为 /dev/input/event3: rk29-keypad

则event number 为3：按下按键会打印value 1,松开按键则会打印value 0,如下图：