数据结构设计

• hal_i2s.h 的数据结构

  struct aic_i2s_buf_info
  {
      void *buf;
      uint32_t buf_len;
      uint32_t period_len;
  };
  
  struct aic_i2s_transfer_info
  {
      struct aic_dma_chan *dma_chan;
      struct aic_audio_buf_info buf_info;
      int transfer_type;
  };
  
  struct aic_i2s_ctrl
  {
      unsigned long reg_base;
      uint32_t irq_num;
      uint32_t clk_id;
      uint32_t idx;
      struct aic_audio_transfer_info tx_info;   //TX buffer 的参数
      struct aic_audio_transfer_info rx_info;   //RX buffer 的参数
      i2s_callback callback;
      void *arg;
  };

• hal_i2s_format.h 的数据结构

  typedef enum
  {
      I2S_MODE_MASTER,
      I2S_MODE_SLAVE,
  } i2s_mode_t;
  
  typedef enum
  {
      I2S_PROTOCOL_I2S,
      I2S_PROTOCOL_LEFT_J,
      I2S_PROTOCOL_RIGHT_J,
      I2S_PCM_SHORT,
      I2S_PCM_LONG,
  } i2s_protocol_t;
  
  typedef enum
  {
      I2S_LEFT_POLARITY_LOW,
      I2S_LEFT_POLARITY_HIGH,
  } i2s_polarity_t;
  
  typedef enum
  {
      I2S_SAMPLE_RATE_8000              = 8000U,
      I2S_SAMPLE_RATE_11025             = 11025U,
      I2S_SAMPLE_RATE_12000             = 12000U,
      I2S_SAMPLE_RATE_16000             = 16000U,
      I2S_SAMPLE_RATE_22050             = 22050U,
      I2S_SAMPLE_RATE_24000             = 24000U,
      I2S_SAMPLE_RATE_32000             = 32000U,
      I2S_SAMPLE_RATE_44100             = 44100U,
      I2S_SAMPLE_RATE_48000             = 48000U,
      I2S_SAMPLE_RATE_96000             = 96000U,
      I2S_SAMPLE_RATE_192000            = 192000U,
      I2S_SAMPLE_RATE_256000            = 256000U,
  } i2s_sample_rate_t;
  
  typedef enum
  {
      I2S_SAMPLE_WIDTH_8BIT = 8U,
      I2S_SAMPLE_WIDTH_12BIT = 12U,
      I2S_SAMPLE_WIDTH_16BIT = 16U,
      I2S_SAMPLE_WIDTH_20BIT = 20U,
      I2S_SAMPLE_WIDTH_24BIT = 24U,
      I2S_SAMPLE_WIDTH_28BIT = 28U,
      I2S_SAMPLE_WIDTH_32BIT = 32U,
  } i2s_sample_width_t;
  
  typedef enum
  {
      I2S_LEFT_CHANNEL,
      I2S_RIGHT_CHANNEL,
      I2S_LEFT_RIGHT_CHANNEL,
  } i2s_sound_channel_t;
  
  typedef enum
  {
      I2S_STREAM_PLAYBACK     = 0,
      I2S_STREAM_RECORD       = 1,
  } i2s_stream_t;
  
  typedef struct
  {
      i2s_mode_t              mode;
      i2s_protocol_t          protocol;
      i2s_polarity_t          polarity;
      i2s_sample_rate_t       rate;
      i2s_sample_width_t      width;
      i2s_sound_channel_t     channel;
      uint32_t                sclk_nfs;
      uint32_t                mclk_nfs;
      i2s_stream_t            stream;
  } i2s_format_t;

struct aic_i2s_sound
{
    struct rt_audio_device audio;
    aic_i2s_ctrl i2s;
    struct codec *codec;
    i2s_format_t format;    //i2s 的传输格式
    rt_uint8_t volume;      //playback 音量
    char *name;             //设备名
    uint32_t i2s_idx;
    uint8_t record_idx;
};

static struct aic_i2s_sound snd_dev[] =
{
#ifdef AIC_USING_I2S0
    {
        .name = "i2s0_sound",
        .i2s_idx = 0,
    },
#endif
#ifdef AIC_USING_I2S1
    {
        .name = "i2s1_sound",
        .i2s_idx = 1,
    },
#endif
};