DMA初始化如下：
static void DMA_Configuration(rt_uint32_t addr, rt_size_t size)
{
  DMA_InitTypeDef DMA_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
       
  RCC_AHB1PeriphClockCmd(CODEC_I2S_RCC_AHB, ENABLE);
       
        DMA_DeInit(AUDIO_I2S_DMA_STREAM);
  /* DMA Channel configuration ----------------------------------------------*/
  DMA_Cmd(AUDIO_I2S_DMA_STREAM, DISABLE);
        DMA_InitStructure.DMA_Channel = AUDIO_I2S_DMA_CHANNEL;  
  DMA_InitStructure.DMA_PeripheralBaseAddr = (rt_uint32_t)(&(CODEC_I2S_PORT->DR));
//        DMA_InitStructure.DMA_PeripheralBaseAddr = 0x4000380C;
  DMA_InitStructure.DMA_Memory0BaseAddr = (rt_uint32_t) addr;
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
  DMA_InitStructure.DMA_BufferSize = size;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;  
  DMA_Init(AUDIO_I2S_DMA_STREAM, &DMA_InitStructure);

        /* Enable SPI DMA Tx request */
        SPI_I2S_DMACmd(CODEC_I2S_PORT, SPI_I2S_DMAReq_Tx, ENABLE);

        DMA_ITConfig(AUDIO_I2S_DMA_STREAM, DMA_IT_TC, ENABLE);
        DMA_Cmd(AUDIO_I2S_DMA_STREAM, ENABLE);
//        DMA_ITConfig(CODEC_I2S_DMA, DMA_IT_TC, ENABLE);

//        DMA_Cmd(CODEC_I2S_DMA, ENABLE);
//        /* Enable SPI DMA Tx request */
//  SPI_I2S_DMACmd(CODEC_I2S_PORT, SPI_I2S_DMAReq_Tx, ENABLE);
//       
//         if ((CODEC_I2S->I2SCFGR & I2S_ENABLE_MASK) == 0)
//  {
//    I2S_Cmd(CODEC_I2S, ENABLE);
//  }
          /* DMA IRQ Channel configuration */
  NVIC_InitStructure.NVIC_IRQChannel = AUDIO_I2S_DMA_IRQ;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}


谢谢