STM32 SAI DMA通道错位

zhang5055258 提问时间：2021-7-1 20:41 / 未解决

问答
是否解决:	未解决

STM32 SAI加DMA 配置为TDM 4通道循环接收数据，板卡在运行一段时间后，会由正常的1234通道的顺序变为2341或者3412之类的
void MX_SAI1_Init(void)
{

  /* USER CODE BEGIN SAI1_Init 0 */

  /* USER CODE END SAI1_Init 0 */

  /* USER CODE BEGIN SAI1_Init 1 */

  /* USER CODE END SAI1_Init 1 */

  hsai_BlockA1.Instance = SAI1_Block_A;
  hsai_BlockA1.Init.Protocol = SAI_FREE_PROTOCOL;
  hsai_BlockA1.Init.AudioMode = SAI_MODEMASTER_RX;
  hsai_BlockA1.Init.DataSize = SAI_DATASIZE_32;
  hsai_BlockA1.Init.FirstBit = SAI_FIRSTBIT_MSB;
  hsai_BlockA1.Init.ClockStrobing = SAI_CLOCKSTROBING_FALLINGEDGE;
  hsai_BlockA1.Init.Synchro = SAI_ASYNCHRONOUS;
  hsai_BlockA1.Init.OutputDrive = SAI_OUTPUTDRIVE_DISABLE;
  hsai_BlockA1.Init.NoDivider = SAI_MASTERDIVIDER_ENABLE;
  hsai_BlockA1.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_EMPTY;
  hsai_BlockA1.Init.AudioFrequency = SAI_AUDIO_FREQUENCY_48K;
  hsai_BlockA1.Init.SynchroExt = SAI_SYNCEXT_DISABLE;
  hsai_BlockA1.Init.MonoStereoMode = SAI_STEREOMODE;
  hsai_BlockA1.Init.CompandingMode = SAI_NOCOMPANDING;
  hsai_BlockA1.FrameInit.FrameLength = 128;
  hsai_BlockA1.FrameInit.ActiveFrameLength = 2;
  hsai_BlockA1.FrameInit.FSDefinition = SAI_FS_STARTFRAME;
  hsai_BlockA1.FrameInit.FSPolarity = SAI_FS_ACTIVE_HIGH;
  hsai_BlockA1.FrameInit.FSOffset = SAI_FS_BEFOREFIRSTBIT;
  hsai_BlockA1.SlotInit.FirstBitOffset = 0;
  hsai_BlockA1.SlotInit.SlotSize = SAI_SLOTSIZE_32B;
  hsai_BlockA1.SlotInit.SlotNumber = 4;
  hsai_BlockA1.SlotInit.SlotActive = 0x0000000F;
  if (HAL_SAI_Init(&hsai_BlockA1) != HAL_OK)
  {
Error_Handler();
  }

  /* USER CODE BEGIN SAI1_Init 2 */

  /* USER CODE END SAI1_Init 2 */

}

void HAL_SAI_MspInit(SAI_HandleTypeDef* hsai)
{

  GPIO_InitTypeDef GPIO_InitStruct;
/* SAI1 */
if(hsai->Instance==SAI1_Block_A)
{
/* SAI1 clock enable */
if (SAI1_client == 0)
{
   __HAL_RCC_SAI1_CLK_ENABLE();
}
SAI1_client ++;

/**SAI1_A_Block_A GPIO Configuration
PE4    ------> SAI1_FS_A
PE5    ------> SAI1_SCK_A
PE6    ------> SAI1_SD_A
*/
GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF6_SAI1;
HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

/* Peripheral DMA init*/

hdma_sai1_a.Instance = DMA2_Stream1;
hdma_sai1_a.Init.Channel = DMA_CHANNEL_0;
hdma_sai1_a.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_sai1_a.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_sai1_a.Init.MemInc = DMA_MINC_ENABLE;
hdma_sai1_a.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_sai1_a.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_sai1_a.Init.Mode = DMA_CIRCULAR;
hdma_sai1_a.Init.Priority = DMA_PRIORITY_LOW;
hdma_sai1_a.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_sai1_a) != HAL_OK)
{
   Error_Handler();
}

/* Several peripheral DMA handle pointers point to the same DMA handle.
   Be aware that there is only one stream to perform all the requested DMAs. */
__HAL_LINKDMA(hsai,hdmarx,hdma_sai1_a);
__HAL_LINKDMA(hsai,hdmatx,hdma_sai1_a);
}
}