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SAI issue on STM32H743BIT MCU.,

Edwin kaus
Associate II

‎2018-05-22 11:48 PM

Posted on May 23, 2018 at 08:48

Hello.,.,

I used STM32F765BIT MCU SAI interface in slave  mode to capture 4 channel audio inputs(TDM mode), I am using DMA (in Circular mode) to receive the audio data and it is working fine , But now I am upgrading to STM32H7BI MCU and I used the same procedure as earlier but I am not getting any DMA interrupts and data. I cross checked the signals from audio codec Frame clock, sampling clock, & data in are coming proper. I am suspecting the driver issue either in DMA or SAI interface , Can anyone just look into this and suggest any changes required.

SAI interface Init function:-

  hsai_BlockA2.Instance = SAI2_Block_A;

  hsai_BlockA2.Init.Protocol = SAI_FREE_PROTOCOL;

  hsai_BlockA2.Init.AudioMode = SAI_MODESLAVE_RX;

  hsai_BlockA2.Init.DataSize = SAI_DATASIZE_16;

  hsai_BlockA2.Init.FirstBit = SAI_FIRSTBIT_MSB;

  hsai_BlockA2.Init.ClockStrobing = SAI_CLOCKSTROBING_FALLINGEDGE;

  hsai_BlockA2.Init.Synchro = SAI_ASYNCHRONOUS;

  hsai_BlockA2.Init.OutputDrive = SAI_OUTPUTDRIVE_DISABLE;

  hsai_BlockA2.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_HF;

  hsai_BlockA2.Init.SynchroExt = SAI_SYNCEXT_DISABLE;

  hsai_BlockA2.Init.MonoStereoMode = SAI_STEREOMODE;

  hsai_BlockA2.Init.CompandingMode = SAI_NOCOMPANDING;

  hsai_BlockA2.Init.TriState = SAI_OUTPUT_NOTRELEASED;

  hsai_BlockA2.Init.PdmInit.Activation = DISABLE;

  hsai_BlockA2.Init.PdmInit.MicPairsNbr = 0;

  hsai_BlockA2.Init.PdmInit.ClockEnable = SAI_PDM_CLOCK1_ENABLE;

  hsai_BlockA2.FrameInit.FrameLength = 64;

  hsai_BlockA2.FrameInit.ActiveFrameLength = 1;

  hsai_BlockA2.FrameInit.FSDefinition = SAI_FS_STARTFRAME;

  hsai_BlockA2.FrameInit.FSPolarity = SAI_FS_ACTIVE_LOW;

  hsai_BlockA2.FrameInit.FSOffset = SAI_FS_FIRSTBIT;

  hsai_BlockA2.SlotInit.FirstBitOffset = 0;

  hsai_BlockA2.SlotInit.SlotSize = SAI_SLOTSIZE_DATASIZE;

  hsai_BlockA2.SlotInit.SlotNumber = 4;

  hsai_BlockA2.SlotInit.SlotActive = 0x0000000F;

  if (HAL_SAI_Init(&hsai_BlockA2) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

  hsai_BlockB2.Instance = SAI2_Block_B;

  hsai_BlockB2.Init.Protocol = SAI_FREE_PROTOCOL;

  hsai_BlockB2.Init.AudioMode = SAI_MODESLAVE_TX;

  hsai_BlockB2.Init.DataSize = SAI_DATASIZE_16;

  hsai_BlockB2.Init.FirstBit = SAI_FIRSTBIT_MSB;

  hsai_BlockB2.Init.ClockStrobing = SAI_CLOCKSTROBING_FALLINGEDGE;

  hsai_BlockB2.Init.Synchro = SAI_SYNCHRONOUS;

  hsai_BlockB2.Init.OutputDrive = SAI_OUTPUTDRIVE_DISABLE;

  hsai_BlockB2.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_HF;

  hsai_BlockB2.Init.SynchroExt = SAI_SYNCEXT_DISABLE;

  hsai_BlockB2.Init.MonoStereoMode = SAI_STEREOMODE;

  hsai_BlockB2.Init.CompandingMode = SAI_NOCOMPANDING;

  hsai_BlockB2.Init.TriState = SAI_OUTPUT_NOTRELEASED;

  hsai_BlockB2.Init.PdmInit.Activation = DISABLE;

  hsai_BlockB2.Init.PdmInit.MicPairsNbr = 0;

  hsai_BlockB2.Init.PdmInit.ClockEnable = SAI_PDM_CLOCK1_ENABLE;

  hsai_BlockB2.FrameInit.FrameLength = 64;

  hsai_BlockB2.FrameInit.ActiveFrameLength = 1;

  hsai_BlockB2.FrameInit.FSDefinition = SAI_FS_STARTFRAME;

  hsai_BlockB2.FrameInit.FSPolarity = SAI_FS_ACTIVE_LOW;

  hsai_BlockB2.FrameInit.FSOffset = SAI_FS_FIRSTBIT;

  hsai_BlockB2.SlotInit.FirstBitOffset = 0;

  hsai_BlockB2.SlotInit.SlotSize = SAI_SLOTSIZE_DATASIZE;

  hsai_BlockB2.SlotInit.SlotNumber = 4;

  hsai_BlockB2.SlotInit.SlotActive = 0x0000000F;

  if (HAL_SAI_Init(&hsai_BlockB2) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

#stm32h7 #sai-audio-record #i2s
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