数据结构设计

struct aic_audio_buf_info
{
    void *buf;
    uint32_t buf_len;
    uint32_t period_len;
};

struct aic_audio_transfer_info
{
    struct aic_dma_chan *dma_chan;
    struct aic_audio_buf_info buf_info;
    int transfer_type;
};

struct aic_audio_ctrl
{
    unsigned long reg_base;
    uint32_t irq_num;
    uint32_t clk_id;
    struct aic_audio_transfer_info tx_info;   //TX buffer 的参数
    struct aic_audio_transfer_info dmic_info; //DMIC RX buffer 的参数
    struct aic_audio_transfer_info amic_info; //AMIC RX buffer 的参数
    audio_callback callback;
    void *arg;
    struct aic_audio_config config;
};

struct aic_audio
{
    struct rt_audio_device audio;
    aic_audio_ctrl codec;
    rt_uint8_t volume;      //playback 音量
    char *pa_name;          //PA 引脚的名字
    unsigned int gpio_pa;   //PA 引脚的 IO 口号
};

struct aic_dmic
{
    struct rt_audio_device audio;
    aic_audio_ctrl codec;
    rt_uint8_t volume;
    uint8_t index;
};