模拟按键发送给linux开发板

最新推荐文章于 2025-01-26 10:00:00 发布

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最新推荐文章于 2025-01-26 10:00:00 发布

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分类专栏：总结文章标签：按键 linux 模拟按键

本文链接：https://blog.youkuaiyun.com/zengzhihao/article/details/52870211

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本文介绍了一个使用C语言实现的红外遥控器按键模拟程序。该程序通过直接向/dev/input/event2设备文件写入特定的input_event结构体来模拟上键按下与释放的过程。文章提供了完整的源代码，并展示了如何打开设备文件及构造事件。

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参考http://blog.youkuaiyun.com/r77683962/article/details/50858461

由于设置的qt监听的是红外遥控器，输入子系统为/dev/input/event2

代码如下，模拟上键发送给event2，

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/input.h>
#include <string.h>

void simulate_key(int fd , int kval) {
    struct input_event event;
    int ret;

    printf("start write:%d fd:%d\n", sizeof(event), fd);
    event.type = EV_KEY;//down key
    event.code = kval;
    event.value = 1; //down key
    //gettimeofday(&event.time, 0);
    ret = write(fd, &event, sizeof(event));
    printf("write %d ret=%d type:%d code:%d value:%d\n", __LINE__, ret, event.type, event.code, event.value);

    event.type = EV_SYN;
    event.code = SYN_REPORT;
    event.value = 0;
    ret = write(fd, &event, sizeof(event));
    printf("write %d ret=%d type:%d code:%d value:%d\n", __LINE__, ret, event.type, event.code, event.value);


    memset(&event, 0, sizeof(event));
    gettimeofday(&event.time, NULL);
    event.type = EV_KEY;
    event.code = kval;
    event.value = 0;
    ret = write(fd, &event, sizeof(event));
    printf("write %d ret=%d type:%d code:%d value:%d\n", __LINE__, ret, event.type, event.code, event.value);

    event.type = EV_SYN;
    event.code = SYN_REPORT;
    event.value = 0;
    ret = write(fd, &event, sizeof(event));
    printf("write %d ret=%d type:%d code:%d value:%d\n", __LINE__, ret, event.type, event.code, event.value);



}

int main(void) {


    int fd;
    int ret;
    struct input_event event = {0};
    fd = open("/dev/input/event2", O_RDWR);
    if (fd <= 0) {
        printf("open device fail\n");
        return -1;
    }

#if 1
    printf("start send a key\n");
    //simulate_key(fd, KEY_UP);
    simulate_key(fd, 103);
#else
    while(1) {
        ret = read(fd, &event, sizeof(event));
        if (ret == sizeof(event)) {
            printf("type:%d code:%d value:%d\n", event.type, event.code, event.value);
        
        } else {
            printf("fail read\n");
            break;
        }
        
    
    }

#endif
    close(fd);


    return 0;
}