STM32F7676vit6 SAI connection to audio CODEC - 2 outputs; 1 input.

[LFrei.2]

Hey, 

I am using a STM32F7676vit6 Controller an try to set up a SAI connection to my audio CODEC now my problem is that the CODEC has two Serial outputs and one serial input. So i configured:

SAI1A to be the transmitting master SAI1B is a synchronous Slave which is configured to be in sync with SAI1A. SAI2B is also configured a synchronous Slave and configured to be in sync with SAI1A. I also use DMA on all three channels.

Now i receive data on SAI1B and but not on SAI2B (SAI1A works fine). Only wired thing is that after txCpltCallback the SCK and FS do not stop....

I really don't know what to try anymore please help ;).

I use CubeIDE my sai.c file looks like:

/* Includes ------------------------------------------------------------------*/
#include "sai.h"
 
#include "gpio.h"
#include "dma.h"
 
/* USER CODE BEGIN 0 */
 
/* USER CODE END 0 */
 
SAI_HandleTypeDef hsai_BlockA1;
SAI_HandleTypeDef hsai_BlockB1;
SAI_HandleTypeDef hsai_BlockB2;
DMA_HandleTypeDef hdma_sai1_a;
DMA_HandleTypeDef hdma_sai1_b;
DMA_HandleTypeDef hdma_sai2_b;
 
/* SAI1 init function */
void MX_SAI1_Init(void)
{
 
  hsai_BlockA1.Instance = SAI1_Block_A;
  hsai_BlockA1.Init.AudioMode = SAI_MODEMASTER_TX;
  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_192K;
  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;
  if (HAL_SAI_InitProtocol(&hsai_BlockA1, SAI_I2S_LSBJUSTIFIED, SAI_PROTOCOL_DATASIZE_32BIT, 2) != HAL_OK)
  {
    Error_Handler();
  }
 
  hsai_BlockB1.Instance = SAI1_Block_B;
  hsai_BlockB1.Init.AudioMode = SAI_MODESLAVE_RX;
  hsai_BlockB1.Init.Synchro = SAI_SYNCHRONOUS;
  hsai_BlockB1.Init.OutputDrive = SAI_OUTPUTDRIVE_DISABLE;
  hsai_BlockB1.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_EMPTY;
  hsai_BlockB1.Init.SynchroExt = SAI_SYNCEXT_DISABLE;
  hsai_BlockB1.Init.MonoStereoMode = SAI_STEREOMODE;
  hsai_BlockB1.Init.CompandingMode = SAI_NOCOMPANDING;
  hsai_BlockB1.Init.TriState = SAI_OUTPUT_NOTRELEASED;
  if (HAL_SAI_InitProtocol(&hsai_BlockB1, SAI_I2S_STANDARD, SAI_PROTOCOL_DATASIZE_32BIT, 2) != HAL_OK)
  {
    Error_Handler();
  }
 
}
/* SAI2 init function */
void MX_SAI2_Init(void)
{
 
  hsai_BlockB2.Instance = SAI2_Block_B;
  hsai_BlockB2.Init.AudioMode = SAI_MODESLAVE_RX;
  hsai_BlockB2.Init.Synchro = SAI_SYNCHRONOUS_EXT_SAI1;
  hsai_BlockB2.Init.OutputDrive = SAI_OUTPUTDRIVE_DISABLE;
  hsai_BlockB2.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_EMPTY;
  hsai_BlockB2.Init.MonoStereoMode = SAI_STEREOMODE;
  hsai_BlockB2.Init.CompandingMode = SAI_NOCOMPANDING;
  hsai_BlockB2.Init.TriState = SAI_OUTPUT_NOTRELEASED;
  if (HAL_SAI_InitProtocol(&hsai_BlockB2, SAI_I2S_STANDARD, SAI_PROTOCOL_DATASIZE_32BIT, 2) != HAL_OK)
  {
    Error_Handler();
  }
 
}
static uint32_t SAI1_client =0;
static uint32_t SAI2_client =0;
 
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 = SAI1A_FS_Pin|SAI1A_SCK_Pin|SAI1A_DAC_SDATA_Pin;
    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_MEMORY_TO_PERIPH;
    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_NORMAL;
    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);
    }
    if(hsai->Instance==SAI1_Block_B)
    {
      /* SAI1 clock enable */
      if (SAI1_client == 0)
      {
       __HAL_RCC_SAI1_CLK_ENABLE();
      }
    SAI1_client ++;
 
    /**SAI1_B_Block_B GPIO Configuration
    PE3     ------> SAI1_SD_B
    */
    GPIO_InitStruct.Pin = GPIO_PIN_3;
    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_b.Instance = DMA2_Stream5;
    hdma_sai1_b.Init.Channel = DMA_CHANNEL_0;
    hdma_sai1_b.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_sai1_b.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_sai1_b.Init.MemInc = DMA_MINC_ENABLE;
    hdma_sai1_b.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
    hdma_sai1_b.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
    hdma_sai1_b.Init.Mode = DMA_NORMAL;
    hdma_sai1_b.Init.Priority = DMA_PRIORITY_LOW;
    hdma_sai1_b.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    if (HAL_DMA_Init(&hdma_sai1_b) != 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_b);
    __HAL_LINKDMA(hsai,hdmatx,hdma_sai1_b);
    }
/* SAI2 */
    if(hsai->Instance==SAI2_Block_B)
    {
      /* SAI2 clock enable */
      if (SAI2_client == 0)
      {
       __HAL_RCC_SAI2_CLK_ENABLE();
      }
    SAI2_client ++;
 
    /**SAI2_B_Block_B GPIO Configuration
    PA0/WKUP     ------> SAI2_SD_B
    */
    GPIO_InitStruct.Pin = GPIO_PIN_0;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF10_SAI2;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
    /* Peripheral DMA init*/
 
    hdma_sai2_b.Instance = DMA2_Stream6;
    hdma_sai2_b.Init.Channel = DMA_CHANNEL_3;
    hdma_sai2_b.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_sai2_b.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_sai2_b.Init.MemInc = DMA_MINC_ENABLE;
    hdma_sai2_b.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
    hdma_sai2_b.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
    hdma_sai2_b.Init.Mode = DMA_NORMAL;
    hdma_sai2_b.Init.Priority = DMA_PRIORITY_LOW;
    hdma_sai2_b.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    if (HAL_DMA_Init(&hdma_sai2_b) != 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_b);
    __HAL_LINKDMA(hsai,hdmatx,hdma_sai2_b);
    }
}
 
void HAL_SAI_MspDeInit(SAI_HandleTypeDef* hsai)
{
 
/* SAI1 */
    if(hsai->Instance==SAI1_Block_A)
    {
    SAI1_client --;
    if (SAI1_client == 0)
      {
      /* Peripheral clock disable */
       __HAL_RCC_SAI1_CLK_DISABLE();
      }
 
    /**SAI1_A_Block_A GPIO Configuration
    PE4     ------> SAI1_FS_A
    PE5     ------> SAI1_SCK_A
    PE6     ------> SAI1_SD_A
    */
    HAL_GPIO_DeInit(GPIOE, SAI1A_FS_Pin|SAI1A_SCK_Pin|SAI1A_DAC_SDATA_Pin);
 
    HAL_DMA_DeInit(hsai->hdmarx);
    HAL_DMA_DeInit(hsai->hdmatx);
    }
    if(hsai->Instance==SAI1_Block_B)
    {
    SAI1_client --;
      if (SAI1_client == 0)
      {
      /* Peripheral clock disable */
      __HAL_RCC_SAI1_CLK_DISABLE();
      }
 
    /**SAI1_B_Block_B GPIO Configuration
    PE3     ------> SAI1_SD_B
    */
    HAL_GPIO_DeInit(GPIOE, GPIO_PIN_3);
 
    HAL_DMA_DeInit(hsai->hdmarx);
    HAL_DMA_DeInit(hsai->hdmatx);
    }
/* SAI2 */
    if(hsai->Instance==SAI2_Block_B)
    {
    SAI2_client --;
      if (SAI2_client == 0)
      {
      /* Peripheral clock disable */
      __HAL_RCC_SAI2_CLK_DISABLE();
      }
 
    /**SAI2_B_Block_B GPIO Configuration
    PA0/WKUP     ------> SAI2_SD_B
    */
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_0);
 
    HAL_DMA_DeInit(hsai->hdmarx);
    HAL_DMA_DeInit(hsai->hdmatx);
    }
}

To make sure that every thing works in sync i first start both receiving Block and than the Transmitting one like:

HAL_SAI_Receive_DMA(&hsai_BlockB1, (uint8_t*) &meas->BufferADC23[0],
				BufferSize); //ADC 01
 
 HAL_SAI_Receive_DMA(&hsai_BlockB2, (uint8_t*) &meas->BufferADC01[0],
				BufferSize); //ADC 23
 
HAL_SAI_Transmit_DMA(&hsai_BlockA1, (uint8_t*) &LookupTable[0], LookupTableSize); //DAC 01

I am very grateful for any help

[LFrei.2 · Accepted solution]

Hey,

I have found the root cause i think:

It seams that even if I configure the "External Synchro Out" Signal in the STM32CubeIDE that the init function, does not care about it.

Remains unchanged! To me that looks clearly like a bug from the STM32CubeIDE.

hsai_BlockA1.Init.SynchroExt = SAI_SYNCEXT_DISABLE;

/* SAI1 init function */
void MX_SAI1_Init(void)
{
 
  hsai_BlockA1.Instance = SAI1_Block_A;
  hsai_BlockA1.Init.AudioMode = SAI_MODEMASTER_TX;
  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_192K;
  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;
  if (HAL_SAI_InitProtocol(&hsai_BlockA1, SAI_I2S_LSBJUSTIFIED, SAI_PROTOCOL_DATASIZE_32BIT, 2) != HAL_OK)
  {
    Error_Handler();
  }
 
  hsai_BlockB1.Instance = SAI1_Block_B;
  hsai_BlockB1.Init.AudioMode = SAI_MODESLAVE_RX;
  hsai_BlockB1.Init.Synchro = SAI_SYNCHRONOUS;
  hsai_BlockB1.Init.OutputDrive = SAI_OUTPUTDRIVE_DISABLE;
  hsai_BlockB1.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_EMPTY;
  hsai_BlockB1.Init.SynchroExt = SAI_SYNCEXT_DISABLE;
  hsai_BlockB1.Init.MonoStereoMode = SAI_STEREOMODE;
  hsai_BlockB1.Init.CompandingMode = SAI_NOCOMPANDING;
  hsai_BlockB1.Init.TriState = SAI_OUTPUT_NOTRELEASED;
  if (HAL_SAI_InitProtocol(&hsai_BlockB1, SAI_I2S_STANDARD, SAI_PROTOCOL_DATASIZE_32BIT, 2) != HAL_OK)
  {
    Error_Handler();
  }

To fix that and enable the first block SAI1 to output the external sync signal, it is necessary to manually configure both sub-Blocks of the SAI1:

hsai_BlockA1.Init.SynchroExt = SAI_SYNCEXT_OUTBLOCKA_ENABLE;
 
hsai_BlockB1.Init.SynchroExt = SAI_SYNCEXT_OUTBLOCKA_ENABLE;

I hope that i can help others which might run into similar problems.

Cheers,

Luca

[Andrew Neil]

glad that you found it!

---

@LFrei.2 wrote:

I hope that i can help others which might run into similar problems.

---

The best way to do that is to Mark the Solution - then people will see that the thread is "Solved".

Also, please   try to keep the title brief.

[Duddie]

Hi Luca @LFrei.2 

Thank you so much for posting the solution of the problem. I don't know how many days of my life would be wasted without your solution. I am writing the 4 years later and ST still has not solved the problem in CubeMX.

Thanks and wish you many happy day!

[Amel NASRI]

Hi @Duddie ,

Checking on my side using STM32CubeMX 6.11.1, I see that following lines are properly generated:

hsai_BlockA1.Init.SynchroExt = SAI_SYNCEXT_OUTBLOCKA_ENABLE;

hsai_BlockB1.Init.SynchroExt = SAI_SYNCEXT_OUTBLOCKA_ENABLE;

To have these lines generated, I need to:

• Enable External Synchro Out

• In configuration tab, select "Output SAI A enabled" in the "Advanced Parameters" configuration section

I'm not sure that this is really an STM32CubeMX or STM32CubeIDE issue requiring fix.

-Amel