在STM32F746板上的SAI如何才能在TDM模式下工作呢

试图在STM32F746上使用DMA使SAI在TDM模式下工作。
需要传输 8 个立体声通道，样本长度为 16 位。所以 16 * 2 * 8 = 256 位帧。
初始化代码：

• hsai_BlockA1.Instance = SAI2_Block_A;
•   hsai_BlockA1.Init.Protocol = SAI_FREE_PROTOCOL;
•   hsai_BlockA1.Init.AudioMode = SAI_MODEMASTER_TX;
•   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_FULL;
•   hsai_BlockA1.Init.AudioFrequency = SAI_AUDIO_FREQUENCY_44K;
•   hsai_BlockA1.Init.SynchroExt = SAI_SYNCEXT_DISABLE;
•   hsai_BlockA1.Init.MonoStereoMode = SAI_STEREOMODE;
•   hsai_BlockA1.Init.CompandingMode = SAI_NOCOMPANDING;
•   hsai_BlockA1.Init.TriState = SAI_OUTPUT_NOTRELEASED;
•   hsai_BlockA1.FrameInit.FrameLength = 256;
•   hsai_BlockA1.FrameInit.ActiveFrameLength = 1;
•   hsai_BlockA1.FrameInit.FSDefinition = SAI_FS_STARTFRAME;
•   hsai_BlockA1.FrameInit.FSPolarity = SAI_FS_ACTIVE_LOW;
•   hsai_BlockA1.FrameInit.FSOffset = SAI_FS_FIRSTBIT;
•   hsai_BlockA1.SlotInit.FirstBitOffset = 0;
•   hsai_BlockA1.SlotInit.SlotSize = SAI_SLOTSIZE_DATASIZE;
•   hsai_BlockA1.SlotInit.SlotNumber = 8;
•   hsai_BlockA1.SlotInit.SlotActive = 0x000000FF;
•   HAL_SAI_Init(&hsai_BlockA1);
  

MSP 初始化：

• if(hsai->Instance==SAI2_Block_A)
•     {
•     /* Peripheral clock enable */
•   /** Initializes the peripherals clock
•   */
•     PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_SAI2;
•     PeriphClkInitStruct.PLLSAI.PLLSAIN = 316;
•     PeriphClkInitStruct.PLLSAI.PLLSAIR = 2;
•     PeriphClkInitStruct.PLLSAI.PLLSAIQ = 7;
•     PeriphClkInitStruct.PLLSAI.PLLSAIP = RCC_PLLSAIP_DIV2;
•     PeriphClkInitStruct.PLLSAIDivQ = 1;
•     PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_2;
•     PeriphClkInitStruct.Sai2ClockSelection = RCC_SAI2CLKSOURCE_PLLSAI;
•     if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
•     {
•       Error_Handler();
•     }
•     if (SAI2_client == 0)
•     {
•        __HAL_RCC_SAI2_CLK_ENABLE();
•     /* Peripheral interrupt init*/
•     HAL_NVIC_SetPriority(SAI2_IRQn, 5, 0);
•     HAL_NVIC_EnableIRQ(SAI2_IRQn);
•     }
•     SAI2_client ++;
•     /**SAI2_A_Block_A GPIO Configuration
•     PD11     ------> SAI2_SD_A
•     PD12     ------> SAI2_FS_A
•     PD13     ------> SAI2_SCK_A
•     */
•     GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13;
•     GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
•     GPIO_InitStruct.Pull = GPIO_PULLUP;
•     GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
•     GPIO_InitStruct.Alternate = GPIO_AF8_SAI2;
•     HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
•       /* Peripheral DMA init*/
•     hdma_sai2_a.Instance = DMA2_Stream4;
•     hdma_sai2_a.Init.Channel = DMA_CHANNEL_3;
•     hdma_sai2_a.Init.Direction = DMA_MEMORY_TO_PERIPH;
•     hdma_sai2_a.Init.PeriphInc = DMA_PINC_DISABLE;
•     hdma_sai2_a.Init.MemInc = DMA_MINC_ENABLE;
•     hdma_sai2_a.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
•     hdma_sai2_a.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
•     hdma_sai2_a.Init.Mode = DMA_CIRCULAR;
•     hdma_sai2_a.Init.Priority = DMA_PRIORITY_MEDIUM;
•     hdma_sai2_a.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
•     if (HAL_DMA_Init(&hdma_sai2_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_sai2_a);
•     __HAL_LINKDMA(hsai,hdmatx,hdma_sai2_a);
•     }
  

启动 DMA 后，DMA 流的 NDTR 寄存器被设置为 BufferSize-8（我假设由于 FIFO 大小为 8 字节）并且之后没有任何反应。没有产生任何中断。在软件轮询模式下，由于超时，我收到 HAL_ERROR。