i2s的DMA模式数据不能发送问题

只看该作者 · 2010-8-25 11:40

SPI2口以i2s模式数据发送，直接往SPI->DR送数据，正常。要提高效率，配置到DMA模式送数据，无法启动数据发送。

望指教。

DMA 配置的代码：
static void DMA_i2sTxConfiguration(uint16_t *BufferSRC, uint32_t BufferSize)
{
  DMA_InitTypeDef DMA_InitStructure;

  /* DISABLE the SPI2/I2S2 peripheral */
  I2S_Cmd(SPI2, DISABLE);

  DMA_ClearFlag(DMA1_FLAG_TC5 | DMA1_FLAG_TE5 | DMA1_FLAG_HT5 | DMA1_FLAG_GL5);

  /* DMA1 Channel4 disable */
  DMA_Cmd(DMA1_Channel5, DISABLE);

  /* DMA1 Channel4 Config */
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI2->DR;
  printf("addr:%x\r\n", DMA_InitStructure.DMA_PeripheralBaseAddr);

  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)BufferSRC;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = BufferSize / 2;
  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_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel5, &DMA_InitStructure);

  // 允许DMA数据发送
  SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE);

  /* DMA1 Channel5 enable */
  DMA_Cmd(DMA1_Channel5, ENABLE);

  /* ENABLE the SPI2/I2S2 peripheral */
  I2S_Cmd(SPI2, ENABLE);
}