I2C data reading problem STM32F746

[q123w123e123qweqwe]

Hello I have a problem with reading data on I2C. My code goes HardFault error after this( while (hi2c->XferCount > 0U);)

line. I'm reallt stuck in here. Does anyone have idea about that?

HAL_StatusTypeDef HAL_I2C_Mem_Read(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint8_t *pData, uint16_t Size, uint32_t Timeout)
{
  uint32_t tickstart;
 
  /* Check the parameters */
  assert_param(IS_I2C_MEMADD_SIZE(MemAddSize));
 
  if (hi2c->State == HAL_I2C_STATE_READY)
  {
    if ((pData == NULL) || (Size == 0U))
    {
      hi2c->ErrorCode = HAL_I2C_ERROR_INVALID_PARAM;
      return  HAL_ERROR;
    }
 
    /* Process Locked */
    __HAL_LOCK(hi2c);
 
    /* Init tickstart for timeout management*/
    tickstart = HAL_GetTick();
 
    if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BUSY, SET, I2C_TIMEOUT_BUSY, tickstart) != HAL_OK)
    {
      return HAL_ERROR;
    }
 
    hi2c->State     = HAL_I2C_STATE_BUSY_RX;
    hi2c->Mode      = HAL_I2C_MODE_MEM;
    hi2c->ErrorCode = HAL_I2C_ERROR_NONE;
 
    /* Prepare transfer parameters */
    hi2c->pBuffPtr  = pData;
    hi2c->XferCount = Size;
    hi2c->XferISR   = NULL;
 
    /* Send Slave Address and Memory Address */
    if (I2C_RequestMemoryRead(hi2c, DevAddress, MemAddress, MemAddSize, Timeout, tickstart) != HAL_OK)
    {
      /* Process Unlocked */
      __HAL_UNLOCK(hi2c);
      return HAL_ERROR;
    }
 
    /* Send Slave Address */
    /* Set NBYTES to write and reload if hi2c->XferCount > MAX_NBYTE_SIZE and generate RESTART */
    if (hi2c->XferCount > MAX_NBYTE_SIZE)
    {
      hi2c->XferSize = MAX_NBYTE_SIZE;
      I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, I2C_RELOAD_MODE, I2C_GENERATE_START_READ);
    }
    else
    {
      hi2c->XferSize = hi2c->XferCount;
      I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, I2C_AUTOEND_MODE, I2C_GENERATE_START_READ);
    }
 
    do
    {
      /* Wait until RXNE flag is set */
      if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_RXNE, RESET, Timeout, tickstart) != HAL_OK)
      {
        return HAL_ERROR;
      }
 
      /* Read data from RXDR */
      *hi2c->pBuffPtr = (uint8_t)hi2c->Instance->RXDR;
 
      /* Increment Buffer pointer */
      hi2c->pBuffPtr++;
 
      hi2c->XferSize--;
      hi2c->XferCount--;
 
      if ((hi2c->XferCount != 0U) && (hi2c->XferSize == 0U))
      {
        /* Wait until TCR flag is set */
        if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TCR, RESET, Timeout, tickstart) != HAL_OK)
        {
          return HAL_ERROR;
        }
 
        if (hi2c->XferCount > MAX_NBYTE_SIZE)
        {
          hi2c->XferSize = MAX_NBYTE_SIZE;
          I2C_TransferConfig(hi2c, DevAddress, (uint8_t) hi2c->XferSize, I2C_RELOAD_MODE, I2C_NO_STARTSTOP);
        }
        else
        {
          hi2c->XferSize = hi2c->XferCount;
          I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, I2C_AUTOEND_MODE, I2C_NO_STARTSTOP);
        }
      }
    }
    while (hi2c->XferCount > 0U);//////////////////////////////////////////////////////////////
 
    /* No need to Check TC flag, with AUTOEND mode the stop is automatically generated */
    /* Wait until STOPF flag is reset */
    if (I2C_WaitOnSTOPFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)
    {
      return HAL_ERROR;
    }
 
    /* Clear STOP Flag */
    __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_STOPF);
 
    /* Clear Configuration Register 2 */
    I2C_RESET_CR2(hi2c);
 
    hi2c->State = HAL_I2C_STATE_READY;
    hi2c->Mode  = HAL_I2C_MODE_NONE;
 
    /* Process Unlocked */
    __HAL_UNLOCK(hi2c);
 
    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

[Martin KJELDSEN]

Did you check registers for errors to see if there's a hint?

[q123w123e123qweqwe]

Hi Martin,

After I wrote this I solve this issue it was just my bad. Thanks for reply.

[TDK]

Consider posting your solution so that others may learn.

[q123w123e123qweqwe]

it was just a problem caused by incorrectly sending the Length value to the reading function. Program goes into hard fault error because the value that should be 4 is much higher.

[Martin KJELDSEN]

Good news 🙂