STM32: SPI: LCD — Вы всё делаете не так [восклицательный знак]

/**
  * @brief  Transmit and Receive an amount of data in blocking mode.
  * @param  hspi: pointer to a SPI_HandleTypeDef structure that contains
  *               the configuration information for SPI module.
  * @param  pTxData: pointer to transmission data buffer
  * @param  pRxData: pointer to reception data buffer
  * @param  Size: amount of data to be sent and received
  * @param  Timeout: Timeout duration
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_SPI_TransmitReceive(SPI_HandleTypeDef *hspi, uint8_t *pTxData, uint8_t *pRxData, uint16_t Size, uint32_t Timeout)
{
#ifdef USE_SPI_CRC
  __IO uint16_t tmpreg = 0U;
#endif
  uint32_t tickstart = 0U;
  HAL_StatusTypeDef errorcode = HAL_OK;

  /* Check Direction parameter */
  assert_param(IS_SPI_DIRECTION_2LINES(hspi->Init.Direction));

  /* Process Locked */
  __HAL_LOCK(hspi);

  /* Init tickstart for timeout managment*/
  tickstart = HAL_GetTick();

  if(!((hspi->State == HAL_SPI_STATE_READY) || \
    ((hspi->Init.Mode == SPI_MODE_MASTER) && (hspi->Init.Direction == SPI_DIRECTION_2LINES) && (hspi->State == HAL_SPI_STATE_BUSY_RX))))
  {
    errorcode = HAL_BUSY;
    goto error;
  }

  if((pTxData == NULL) || (pRxData == NULL) || (Size == 0U))
  {
    errorcode = HAL_ERROR;
    goto error;
  }

  /* Don't overwrite in case of HAL_SPI_STATE_BUSY_RX */
  if(hspi->State == HAL_SPI_STATE_READY)
  {
    hspi->State = HAL_SPI_STATE_BUSY_TX_RX;
  }

  /* Set the transaction information */
  hspi->ErrorCode   = HAL_SPI_ERROR_NONE;
  hspi->pRxBuffPtr  = (uint8_t *)pRxData;
  hspi->RxXferCount = Size;
  hspi->RxXferSize  = Size;
  hspi->pTxBuffPtr  = (uint8_t *)pTxData;
  hspi->TxXferCount = Size;
  hspi->TxXferSize  = Size;

  /*Init field not used in handle to zero */
  hspi->RxISR       = NULL;
  hspi->TxISR       = NULL;

#ifdef USE_SPI_CRC
  /* Reset CRC Calculation */
  if(hspi->Init.CRCCalculation == SPI_CRCCALCULATION_ENABLE)
  {
    SPI_RESET_CRC(hspi);
  }
#endif

  /* Check if the SPI is already enabled */
  if((hspi->Instance->CR1 &SPI_CR1_SPE) != SPI_CR1_SPE)
  {
    /* Enable SPI peripheral */
    __HAL_SPI_ENABLE(hspi);
  }

  /* Transmit and Receive data in 16 Bit mode */
  if(hspi->Init.DataSize == SPI_DATASIZE_16BIT)
  {
    while ((hspi->TxXferCount > 0U) || (hspi->RxXferCount > 0U))
    {
      /* Check TXE flag */
      if((hspi->TxXferCount > 0U) && (__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_TXE)))
      {
        hspi->Instance->DR = *((uint16_t *)pTxData);
        pTxData += sizeof(uint16_t);
        hspi->TxXferCount--;

#ifdef USE_SPI_CRC
        /* Enable CRC Transmission */
        if((hspi->TxXferCount == 0U) && (hspi->Init.CRCCalculation == SPI_CRCCALCULATION_ENABLE))
        {
          SET_BIT(hspi->Instance->CR1, SPI_CR1_CRCNEXT);
        }
#endif
      }

      /* Check RXNE flag */
      if((hspi->RxXferCount > 0U) && (__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_RXNE)))
      {
        *((uint16_t *)pRxData) = hspi->Instance->DR;
        pRxData += sizeof(uint16_t);
        hspi->RxXferCount--;
      }
      if((Timeout != HAL_MAX_DELAY) && ((HAL_GetTick()-tickstart) >=  Timeout))
      {
        errorcode = HAL_TIMEOUT;
        goto error;
      }
    }
  }
  /* Transmit and Receive data in 8 Bit mode */
  else
  {
    while((hspi->TxXferCount > 0U) || (hspi->RxXferCount > 0U))
    {
      /* check TXE flag */
      if((hspi->TxXferCount > 0U) && (__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_TXE)))
      {
        *(__IO uint8_t *)&hspi->Instance->DR = (*pTxData++);
        hspi->TxXferCount--;

#ifdef USE_SPI_CRC
        /* Enable CRC Transmission */
        if((hspi->TxXferCount == 0U) && (hspi->Init.CRCCalculation == SPI_CRCCALCULATION_ENABLE))
        {
          SET_BIT(hspi->Instance->CR1, SPI_CR1_CRCNEXT);
        }
#endif
      }

      /* Wait until RXNE flag is reset */
      if((hspi->RxXferCount > 0U) && (__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_RXNE)))
      {
        (*(uint8_t *)pRxData++) = hspi->Instance->DR;
        hspi->RxXferCount--;
      }
      if((Timeout != HAL_MAX_DELAY) && ((HAL_GetTick()-tickstart) >=  Timeout))
      {
        errorcode = HAL_TIMEOUT;
        goto error;
      }
    }
  }

#ifdef USE_SPI_CRC
  /* Read CRC from DR to close CRC calculation process */
  if(hspi->Init.CRCCalculation == SPI_CRCCALCULATION_ENABLE)
  {
    /* Wait until TXE flag */
    if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_RXNE, SET, Timeout, tickstart) != HAL_OK)
    {
      /* Error on the CRC reception */
      SET_BIT(hspi->ErrorCode, HAL_SPI_ERROR_CRC);
      errorcode = HAL_TIMEOUT;
      goto error;
    }
    /* Read CRC */
    tmpreg = hspi->Instance->DR;
    /* To avoid GCC warning */
    UNUSED(tmpreg);
  }

  /* Check if CRC error occurred */
  if(__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_CRCERR))
  {
    SET_BIT(hspi->ErrorCode, HAL_SPI_ERROR_CRC);
    /* Clear CRC Flag */
    __HAL_SPI_CLEAR_CRCERRFLAG(hspi);

    errorcode = HAL_ERROR;
  }
#endif

  /* Check the end of the transaction */
  if(SPI_CheckFlag_BSY(hspi, Timeout, tickstart) != HAL_OK)
  {
    SET_BIT(hspi->ErrorCode, HAL_SPI_ERROR_FLAG);
    errorcode = HAL_ERROR;
  }

error :
  hspi->State = HAL_SPI_STATE_READY;
  __HAL_UNLOCK(hspi);
  return errorcode;
}