键盘 Input子系统
应用层测试代码
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/input.h>
#include <sys/fcntl.h>
int main(int argc, char *argv[])
{
int fd = -1;
int num;
size_t rb;
int version;
char name[20];
struct input_event ev;
int i=0;
if ((fd = open("/dev/input/event1", O_RDONLY)) < 0) //打开设备
{
perror("open error");
exit(1);
}
while(1)
{
rb = read(fd, &ev, sizeof(struct input_event)); //读取设备
if (rb < (int)sizeof(struct input_event)) //读取错误
{
perror("read error");
exit(1);
}
if (EV_KEY==ev.type) //读取的是否是按键内容
{
if (1 == ev.value) //key1被按下
printf("key is pressed\n");
else //key1被释放
printf("key is released\n");
}
}
close(fd);
return 0;
}