RTT Audio驱动，mic和sound的使用问题

发布于 2019-02-22 11:37:25 浏览：2137 订阅该版

```int rt_hw_audio_init(char *i2c_bus_name)
{
    rt_hw_sound_hw_init(i2c_bus_name);
    rt_hw_micphone_init(i2c_bus_name);

return RT_EOK;
}``` audio设备初始化时，是写入相应的i2c名称吗？
```int stm32f4_i2c_init(void)
{
	struct rt_i2c_bus_device *bus;

bus = rt_malloc(sizeof(struct rt_i2c_bus_device));
	if (bus == RT_NULL)
	{
		rt_kprintf("rt_malloc failed<br>");
		return -RT_ENOMEM;
	}

rt_memset((void *)bus, 0, sizeof(struct rt_i2c_bus_device));

bus->priv = (void *)&bit_ops;

stm32f4_i2c_gpio_init();

rt_i2c_bit_add_bus(bus, "i2c0");

return RT_EOK;
}
INIT_DEVICE_EXPORT(stm32f4_i2c_init);
```我看I2C中注册的名称是i2c0，初始化时是写入int rt_hw_audio_init( "i2c0")吗？‘’
```int rt_hw_micphone_init(char *i2c_bus_name)
{
    int result = RT_EOK;
    struct micphone_device *mic = &micphone;

if (mic->recv_fifo != RT_NULL)
    {
        return RT_EOK;
    }

mic->recv_fifo = rt_malloc(AUDIO_RECV_BUFFER_SIZE);
    if (mic->recv_fifo == RT_NULL)
    {
        result = -RT_ENOMEM;
        goto __exit;
    }
    memset(mic->recv_fifo, 0, AUDIO_RECV_BUFFER_SIZE);

mic->parent.type      = RT_Device_Class_Sound;
    mic->parent.init      = micphone_init;
    mic->parent.open      = micphone_open;
    mic->parent.control   = micphone_control;
    mic->parent.write     = RT_NULL;
    mic->parent.read      = micphone_read;
    mic->parent.close     = micphone_close;
    mic->parent.user_data = mic;

/* register the device */
    rt_device_register(&mic->parent, "mic", RT_DEVICE_FLAG_RDONLY | RT_DEVICE_FLAG_DMA_RX);

rt_device_init(&mic->parent);

{
        rt_uint8_t *buffer = rt_malloc(AUDIO_RECV_BUFFER_SIZE);
        if (buffer == RT_NULL)
        {
            result = -RT_ENOMEM;
            goto __exit;
        }
        memset(buffer, 0, AUDIO_RECV_BUFFER_SIZE);

rt_audio_pipe_init(&mic->record_pipe,
                           "voice",
                           RT_PIPE_FLAG_FORCE_WR | RT_PIPE_FLAG_BLOCK_RD,
                           buffer,
                           AUDIO_RECV_BUFFER_SIZE);
    }

return RT_EOK;

__exit:
    if (mic->recv_fifo)
    {
        rt_free(mic->recv_fifo);
        mic->recv_fifo = RT_NULL;
    }

return result;
}```mic设备使用时，也是先获取mic的句柄，然后再使用rt_device_write等函数吗？见下面的代码
```struct micphone_device *mic = RT_NULL;

mic =(struct micphone_device *)rt_device_find("mic");```mic设备使用时不需要再调用rt_device_init函数了吧？我看int rt_hw_micphone_init(char *i2c_bus_name)函数中已经使用了rt_device_init(&mic->parent);是已经使用过rt_device_init函数了吧？对audio设备的使用还不太熟悉，希望得到解答