TI中文支持网设备树配置如下
/{
…………………….
button_x{
compatible="gpio-keys";
pinctrl-names = "default", "sleep";
pinctrl-0 = <&button1>;
pinctrl-1 = <&button2>;
sw@1{
label="sw1";
linux,code = <0x103>;
gpios=<&gpio3 21 GPIO_ACTIVE_HIGH>;//gpio3_21,mode7
};
sw@2{
label="sw2";
linux,code = <0x104>;
gpios=<&gpio4 3 GPIO_ACTIVE_HIGH>;//gpio4_3,mode7
} ;
};
};
&am43xx_pinmux {
………………..
button1: button1 {
pinctrl-single,pins = <
AM4372_IOPAD(0x9ac, PIN_INPUT | MUX_MODE7) //gpio3_21,mode7 gpio0_3,mode9
AM4372_IOPAD(0x9bc, PIN_INPUT | MUX_MODE7) //gpio4_3,mode7
>;
};
button2: button2 {
pinctrl-single,pins = <
AM4372_IOPAD(0x9ac, PIN_INPUT | MUX_MODE7) //gpio3_21,mode7 gpio0_3,mode9
AM4372_IOPAD(0x9bc, PIN_INPUT | MUX_MODE7) //gpio4_3,mode7
>;
};
……………….
};
开发板启动后在 cat /sys/class/input/event0/device/name ,显示button_x
编写应用程序测试
int main(void){
struct input_event key_evt;
int ret,ret_x;
int f_key = open("/dev/input/event0",O_RDWR);
if(f_key < 0){
printf("error in open /dev/input/event0\n");
return -1;
}
while (1){
ret=read(ret_x,(unsigned char*)&key_evt,sizeof(struct input_event));
if(ret<0){
printf("read key event failed:%d",ret);
}else if(key_evt.code != 0x103 &&
key_evt.code != 0x104){
printf("unknown key code:%d",key_evt.code);
}else{
printf("get key event code:%x, value:%x,type:%x",key_evt.code,key_evt.value,key_evt.type);
}
}
}
编译后运行应用程序，但是按对应的按键，却没任何反应，串口不打印任何信息。
是哪里出错了吗？设备树没配好？还是？
yongqing wang：
在写的应用程序之前可以先用test_event 测试一下
