20 想实现使用多媒体扩展板实现一开机就播放音乐，不需要在串口输入指令

发布于 2022-07-10 21:09:44 浏览：553 订阅该版

```c
static void wavplayer_entry(void *parameter)
{
    rt_err_t result = RT_EOK;
    rt_int32_t size;
    int event;

player.buffer = rt_malloc(WP_BUFFER_SIZE);
    if (player.buffer == RT_NULL)
        return;
    rt_memset(player.buffer, 0, WP_BUFFER_SIZE);

player.mq = rt_mq_create("wav_p", sizeof(struct play_msg), 10, RT_IPC_FLAG_FIFO);
    if (player.mq == RT_NULL)
        goto __exit;

player.lock = rt_mutex_create("wav_p", RT_IPC_FLAG_FIFO);
    if (player.lock == RT_NULL)
        goto __exit;

player.volume = WP_VOLUME_DEFAULT;  
    wavplayer_play(play_args.uri);

/* open wavplayer */
        result = wavplayer_open(&player);
        if (result != RT_EOK)
        {
            player.state = PLAYER_STATE_STOPED;
            LOG_I("open wav player failed");
            continue;
        }

LOG_I("play start, uri=%s", player.uri);
        while (1)
        {
                /* read raw data from file stream */
                size = fread(player.buffer, WP_BUFFER_SIZE, 1, player.fp);
                if (size != 1)
                {
                    /* FILE END*/
                    player.state = PLAYER_STATE_STOPED;
                    break;
                }
                else
                {
                    /*witte data to sound device*/
                    rt_device_write(player.device, 0, player.buffer, WP_BUFFER_SIZE);
                }

}

/* close wavplayer */
        wavplayer_close(&player);
        LOG_I("play end");

__exit:
    if (player.buffer)
    {
        rt_free(player.buffer);
        player.buffer = RT_NULL;
    }

if (player.mq)
    {
        rt_mq_delete(player.mq);
        player.mq = RT_NULL;
    }

if (player.lock)
    {
        rt_mutex_delete(player.lock);
        player.lock = RT_NULL;
    }
}

```

卡在rt_device_write(player.device, 0, player.buffer, WP_BUFFER_SIZE);，会写入几次，然后就会卡在rt_device_write不动，使用的是rtt自带的wavplayer软件包，使用的是art-pi多媒体拓展板和art-pi

张世争 2022-07-11

学以致用

unknownwwwww 2022-07-11

这家伙很懒，什么也没写！

张世争 2022-07-11

学以致用

unknownwwwww 2022-07-11

这家伙很懒，什么也没写！

张世争 2022-07-11

学以致用

unknownwwwww 2022-07-11

这家伙很懒，什么也没写！

张世争 2022-07-11

学以致用

unknownwwwww 2022-07-11

这家伙很懒，什么也没写！

张世争 2022-07-11

学以致用

unknownwwwww 2022-07-11

这家伙很懒，什么也没写！

```c
int wavplay_args_prase(int argc, char *argv[], struct wavplay_args *play_args)
{
    int ch;
    int option_index;
    struct optparse options;
    rt_uint8_t action_cnt = 0;
    rt_err_t result = RT_EOK;

if (argc == 1)
    {
        play_args->action = WAVPLAYER_ACTION_HELP;
        return RT_EOK;
    }

/* Parse cmd */
    optparse_init(&options, argv);
    while ((ch = optparse_long(&options, opts, &option_index)) != -1)
    {
        switch (ch)
        {
        case 'h':   /* 甯姪 */
            play_args->action = WAVPLAYER_ACTION_HELP;
            break;

case 's':   /* 鎾斁 */
            play_args->action = WAVPLAYER_ACTION_START;
            play_args->uri = options.optarg;
            action_cnt++;
            break;

case 't':   /* 鍋滄 */
            play_args->action = WAVPLAYER_ACTION_STOP;
            action_cnt++;
            break;

case 'p':   /* 鏆傚仠 */
            play_args->action = WAVPLAYER_ACTION_PAUSE;
            action_cnt++;
            break;

case 'r':   /* 鎭㈠ */
            play_args->action = WAVPLAYER_ACTION_RESUME;
            action_cnt++;
            break;

case 'v':   /* 闊抽噺 */
            play_args->action = WAVPLAYER_ACTION_VOLUME;
            play_args->volume = (options.optarg == RT_NULL) ? (-1) : atoi(options.optarg);
            action_cnt++;
            break;

case 'd':   /* 淇℃伅 */
            play_args->action = WAVPLAYER_ACTION_DUMP;
            break;

default:
            result = -RT_EINVAL;
            break;
        }
    }

/* 鍒ゆ柇 鎾斁 鏆傚仠 鍋滄 鎭㈠ 绉诲姩 鍛戒护鏄惁澶氭浣跨敤 涓嶈兘鍏卞瓨浣跨敤 */
    if (action_cnt > 1)
    {
        rt_kprintf("START STOP PAUSE RESUME parameter can't be used at the same time.\n");
        result = -RT_EINVAL;
    }

return result;
}
```
另外这个是里面wavplay_args_prase函数的内容，如果使用msh的话命令就是wavplay -s /sdcard/sample1.wav
@[张世争](https://oss-club.rt-thread.org/u/f410c92270795027)