stm32f7xx_hal_usart.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32f7xx_hal.h"

#ifdef HAL_USART_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define DUMMY_DATA                             ((uint16_t) 0xFFFFU)
#define TEACK_REACK_TIMEOUT                    ((uint32_t) 1000U)
#define USART_CR1_FIELDS  ((uint32_t)(USART_CR1_M | USART_CR1_PCE | USART_CR1_PS | \
                                     USART_CR1_TE | USART_CR1_RE  | USART_CR1_OVER8))
#define USART_CR2_FIELDS       ((uint32_t)(USART_CR2_CPHA | USART_CR2_CPOL | \
                            USART_CR2_CLKEN | USART_CR2_LBCL | USART_CR2_STOP))

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
static void USART_DMATransmitCplt(DMA_HandleTypeDef *hdma);
static void USART_DMAReceiveCplt(DMA_HandleTypeDef *hdma);
static void USART_DMATxHalfCplt(DMA_HandleTypeDef *hdma);
static void USART_DMARxHalfCplt(DMA_HandleTypeDef *hdma);
static void USART_DMAError(DMA_HandleTypeDef *hdma);
static void USART_DMAAbortOnError(DMA_HandleTypeDef *hdma);
static void USART_EndTxTransfer(USART_HandleTypeDef *husart);
static void USART_EndRxTransfer(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_WaitOnFlagUntilTimeout(USART_HandleTypeDef *husart, uint32_t Flag, FlagStatus Status, uint32_t Tickstart, uint32_t Timeout);
static HAL_StatusTypeDef USART_SetConfig(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_CheckIdleState(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_Transmit_IT(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_EndTransmit_IT(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_Receive_IT(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_TransmitReceive_IT(USART_HandleTypeDef *husart);

/* Exported functions --------------------------------------------------------*/

HAL_StatusTypeDef HAL_USART_Init(USART_HandleTypeDef *husart)
{
  /* Check the USART handle allocation */
  if(husart == NULL)
  {
    return HAL_ERROR;
  }

  /* Check the parameters */
  assert_param(IS_USART_INSTANCE(husart->Instance));

  if(husart->State == HAL_USART_STATE_RESET)
  {
    /* Allocate lock resource and initialize it */
    husart->Lock = HAL_UNLOCKED;
    /* Init the low level hardware : GPIO, CLOCK */
    HAL_USART_MspInit(husart);
  }

  husart->State = HAL_USART_STATE_BUSY;

  /* Disable the Peripheral */
  __HAL_USART_DISABLE(husart);

  /* Set the Usart Communication parameters */
  if (USART_SetConfig(husart) == HAL_ERROR)
  {
    return HAL_ERROR;
  }

  /* In Synchronous mode, the following bits must be kept cleared:
  - LINEN bit in the USART_CR2 register
  - HDSEL, SCEN and IREN bits in the USART_CR3 register.*/
  CLEAR_BIT(husart->Instance->CR2, (USART_CR2_LINEN | USART_CR2_CLKEN));
  CLEAR_BIT(husart->Instance->CR3, (USART_CR3_SCEN | USART_CR3_HDSEL | USART_CR3_IREN));

  /* Enable the Peripheral */
  __HAL_USART_ENABLE(husart);

  /* TEACK and/or REACK to check before moving husart->State to Ready */
  return (USART_CheckIdleState(husart));
}

HAL_StatusTypeDef HAL_USART_DeInit(USART_HandleTypeDef *husart)
{
   /* Check the USART handle allocation */
  if(husart == NULL)
  {
    return HAL_ERROR;
  }

  /* Check the parameters */
  assert_param(IS_USART_INSTANCE(husart->Instance));

  husart->State = HAL_USART_STATE_BUSY;

  husart->Instance->CR1 = 0x0U;
  husart->Instance->CR2 = 0x0U;
  husart->Instance->CR3 = 0x0U;

  /* DeInit the low level hardware */
  HAL_USART_MspDeInit(husart);

  husart->ErrorCode = HAL_USART_ERROR_NONE;
  husart->State = HAL_USART_STATE_RESET;

  /* Process Unlock */
  __HAL_UNLOCK(husart);

  return HAL_OK;
}

 __weak void HAL_USART_MspInit(USART_HandleTypeDef *husart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(husart);
 
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_USART_MspInit can be implemented in the user file
   */
}

 __weak void HAL_USART_MspDeInit(USART_HandleTypeDef *husart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(husart);
 
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_USART_MspDeInit can be implemented in the user file
   */
}

HAL_StatusTypeDef HAL_USART_Transmit(USART_HandleTypeDef *husart, uint8_t *pTxData, uint16_t Size, uint32_t Timeout)
{
  uint16_t* tmp;
  uint32_t tickstart = 0U;

  if(husart->State == HAL_USART_STATE_READY)
  {
    if((pTxData == NULL) || (Size == 0U))
    {
      return  HAL_ERROR;
    }

    /* Process Locked */
    __HAL_LOCK(husart);

    husart->ErrorCode = HAL_USART_ERROR_NONE;
    husart->State = HAL_USART_STATE_BUSY_TX;
    
    /* Init tickstart for timeout managment*/
    tickstart = HAL_GetTick();

    husart->TxXferSize = Size;
    husart->TxXferCount = Size;

    /* Check the remaining data to be sent */
    while(husart->TxXferCount > 0U)
    {
      husart->TxXferCount--;
      if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TC, RESET, tickstart, Timeout) != HAL_OK)
        {
          return HAL_TIMEOUT;
        }
      if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
      {
        tmp = (uint16_t*) pTxData;
        husart->Instance->TDR = (*tmp & (uint16_t)0x01FFU);
        pTxData += 2;
      }
      else
      {
        husart->Instance->TDR = (*pTxData++ & (uint8_t)0xFFU);
      }
    }

    if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TC, RESET, tickstart, Timeout) != HAL_OK)
    {
      return HAL_TIMEOUT;
    }

    husart->State = HAL_USART_STATE_READY;

    /* Process Unlocked */
    __HAL_UNLOCK(husart);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_USART_Receive(USART_HandleTypeDef *husart, uint8_t *pRxData, uint16_t Size, uint32_t Timeout)
{
  uint16_t* tmp;
  uint16_t uhMask;
  uint32_t tickstart = 0U;

  if(husart->State == HAL_USART_STATE_READY)
  {
    if((pRxData == NULL) || (Size == 0U))
    {
      return  HAL_ERROR;
    }
    /* Process Locked */
    __HAL_LOCK(husart);

    husart->ErrorCode = HAL_USART_ERROR_NONE;
    husart->State = HAL_USART_STATE_BUSY_RX;
    
    /* Init tickstart for timeout managment*/
    tickstart = HAL_GetTick();

    husart->RxXferSize = Size;
    husart->RxXferCount = Size;

    /* Computation of USART mask to apply to RDR register */
    __HAL_USART_MASK_COMPUTATION(husart);
    uhMask = husart->Mask;

    /* as long as data have to be received */
    while(husart->RxXferCount > 0U)
    {
      husart->RxXferCount--;

      /* Wait until TC flag is set to send dummy byte in order to generate the
      * clock for the slave to send data.
       * Whatever the frame length (7, 8 or 9-bit long), the same dummy value
       * can be written for all the cases. */
      if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TC, RESET, tickstart, Timeout) != HAL_OK)
      {
        return HAL_TIMEOUT;
      }
      husart->Instance->TDR = (DUMMY_DATA & (uint16_t)0x0FFU);

      /* Wait for RXNE Flag */
      if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
      {
        return HAL_TIMEOUT;
      }

      if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
      {
        tmp = (uint16_t*) pRxData ;
        *tmp = (uint16_t)(husart->Instance->RDR & uhMask);
        pRxData +=2;
      }
      else
      {
        *pRxData++ = (uint8_t)(husart->Instance->RDR & (uint8_t)uhMask);
      }
    }

    husart->State = HAL_USART_STATE_READY;

    /* Process Unlocked */
    __HAL_UNLOCK(husart);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_USART_TransmitReceive(USART_HandleTypeDef *husart, uint8_t *pTxData, uint8_t *pRxData, uint16_t Size, uint32_t Timeout)
{
  uint16_t* tmp;
  uint16_t uhMask;
  uint32_t tickstart = 0U;

  if(husart->State == HAL_USART_STATE_READY)
  {
    if((pTxData == NULL) || (pRxData == NULL) || (Size == 0U))
    {
      return  HAL_ERROR;
    }
    /* Process Locked */
    __HAL_LOCK(husart);

    husart->ErrorCode = HAL_USART_ERROR_NONE;
    husart->State = HAL_USART_STATE_BUSY_RX;
    
    /* Init tickstart for timeout managment*/
    tickstart = HAL_GetTick();

    husart->RxXferSize = Size;
    husart->TxXferSize = Size;
    husart->TxXferCount = Size;
    husart->RxXferCount = Size;

    /* Computation of USART mask to apply to RDR register */
    __HAL_USART_MASK_COMPUTATION(husart);
    uhMask = husart->Mask;

    /* Check the remain data to be sent */
    while(husart->TxXferCount > 0)
    {
      husart->TxXferCount--;
      husart->RxXferCount--;

      /* Wait until TC flag is set to send data */
      if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TC, RESET, tickstart, Timeout) != HAL_OK)
      {
        return HAL_TIMEOUT;
      }
      if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
      {
        tmp = (uint16_t*) pTxData;
        husart->Instance->TDR = (*tmp & uhMask);
        pTxData += 2;
      }
      else
      {
        husart->Instance->TDR = (*pTxData++ & (uint8_t)uhMask);
      }

      /* Wait for RXNE Flag */
      if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
      {
        return HAL_TIMEOUT;
      }

      if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
      {
        tmp = (uint16_t*) pRxData ;
        *tmp = (uint16_t)(husart->Instance->RDR & uhMask);
        pRxData +=2U;
      }
      else
      {
        *pRxData++ = (uint8_t)(husart->Instance->RDR & (uint8_t)uhMask);
      }
    }

    husart->State = HAL_USART_STATE_READY;

    /* Process Unlocked */
    __HAL_UNLOCK(husart);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_USART_Transmit_IT(USART_HandleTypeDef *husart, uint8_t *pTxData, uint16_t Size)
{
  if(husart->State == HAL_USART_STATE_READY)
  {
    if((pTxData == NULL ) || (Size == 0U))
    {
      return HAL_ERROR;
    }

    /* Process Locked */
    __HAL_LOCK(husart);

    husart->pTxBuffPtr = pTxData;
    husart->TxXferSize = Size;
    husart->TxXferCount = Size;

    husart->ErrorCode = HAL_USART_ERROR_NONE;
    husart->State = HAL_USART_STATE_BUSY_TX;

    /* The USART Error Interrupts: (Frame error, noise error, overrun error)
    are not managed by the USART Transmit Process to avoid the overrun interrupt
    when the usart mode is configured for transmit and receive "USART_MODE_TX_RX"
    to benefit for the frame error and noise interrupts the usart mode should be
    configured only for transmit "USART_MODE_TX" */

    /* Process Unlocked */
    __HAL_UNLOCK(husart);

    /* Enable the USART Transmit Data Register Empty Interrupt */
    SET_BIT(husart->Instance->CR3, USART_CR3_EIE);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_USART_Receive_IT(USART_HandleTypeDef *husart, uint8_t *pRxData, uint16_t Size)
{
  if(husart->State == HAL_USART_STATE_READY)
  {
    if((pRxData == NULL ) || (Size == 0U))
    {
      return HAL_ERROR;
    }
    /* Process Locked */
    __HAL_LOCK(husart);

    husart->pRxBuffPtr = pRxData;
    husart->RxXferSize = Size;
    husart->RxXferCount = Size;

    __HAL_USART_MASK_COMPUTATION(husart);

    husart->ErrorCode = HAL_USART_ERROR_NONE;
    husart->State = HAL_USART_STATE_BUSY_RX;

    /* Enable the USART Parity Error Interrupt */
    SET_BIT(husart->Instance->CR1, USART_CR1_PEIE);

    /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
    SET_BIT(husart->Instance->CR3, USART_CR3_EIE);

    /* Enable the USART Data Register not empty Interrupt */
    SET_BIT(husart->Instance->CR1, USART_CR1_RXNEIE);

    /* Process Unlocked */
    __HAL_UNLOCK(husart);


    /* Send dummy byte in order to generate the clock for the Slave to send the next data */
    if(husart->Init.WordLength == USART_WORDLENGTH_9B)
    {
      husart->Instance->TDR = (DUMMY_DATA & (uint16_t)0x01FFU);
    }
    else
    {
      husart->Instance->TDR = (DUMMY_DATA & (uint16_t)0x00FFU);
    }

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_USART_TransmitReceive_IT(USART_HandleTypeDef *husart, uint8_t *pTxData, uint8_t *pRxData,  uint16_t Size)
{

  if(husart->State == HAL_USART_STATE_READY)
  {
    if((pTxData == NULL) || (pRxData == NULL) || (Size == 0U))
    {
      return HAL_ERROR;
    }
    /* Process Locked */
    __HAL_LOCK(husart);

    husart->pRxBuffPtr = pRxData;
    husart->RxXferSize = Size;
    husart->RxXferCount = Size;
    husart->pTxBuffPtr = pTxData;
    husart->TxXferSize = Size;
    husart->TxXferCount = Size;

    /* Computation of USART mask to apply to RDR register */
    __HAL_USART_MASK_COMPUTATION(husart);

    husart->ErrorCode = HAL_USART_ERROR_NONE;
    husart->State = HAL_USART_STATE_BUSY_TX_RX;

    /* Enable the USART Data Register not empty Interrupt */
    SET_BIT(husart->Instance->CR1, USART_CR1_RXNEIE);

    /* Enable the USART Parity Error Interrupt */
    SET_BIT(husart->Instance->CR1, USART_CR1_PEIE);

    /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
    SET_BIT(husart->Instance->CR3, USART_CR3_EIE);

    /* Process Unlocked */
    __HAL_UNLOCK(husart);

    /* Enable the USART Transmit Data Register Empty Interrupt */
    __HAL_USART_ENABLE_IT(husart, USART_IT_TXE);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_USART_Transmit_DMA(USART_HandleTypeDef *husart, uint8_t *pTxData, uint16_t Size)
{
  uint32_t *tmp;

  if(husart->State == HAL_USART_STATE_READY)
  {
    if((pTxData == NULL ) || (Size == 0U))
    {
      return HAL_ERROR;
    }
    /* Process Locked */
    __HAL_LOCK(husart);

    husart->pTxBuffPtr = pTxData;
    husart->TxXferSize = Size;
    husart->TxXferCount = Size;

    husart->ErrorCode = HAL_USART_ERROR_NONE;
    husart->State = HAL_USART_STATE_BUSY_TX;

    /* Set the USART DMA transfer complete callback */
    husart->hdmatx->XferCpltCallback = USART_DMATransmitCplt;

    /* Set the USART DMA Half transfer complete callback */
    husart->hdmatx->XferHalfCpltCallback = USART_DMATxHalfCplt;

    /* Set the DMA error callback */
    husart->hdmatx->XferErrorCallback = USART_DMAError;

    /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
    SET_BIT(husart->Instance->CR3, USART_CR3_EIE);
    SET_BIT(husart->Instance->ISR, (USART_ISR_PE | USART_ISR_FE | USART_ISR_NE | USART_ISR_ORE));
  
    /* Enable the USART transmit DMA channel */
    tmp = (uint32_t*)&pTxData;
    HAL_DMA_Start_IT(husart->hdmatx, *(uint32_t*)tmp, (uint32_t)&husart->Instance->TDR, Size);

    /* Clear the TC flag in the SR register by writing 0 to it */
    __HAL_USART_CLEAR_IT(husart, USART_FLAG_TC);
    
    /* Process Unlocked */
    __HAL_UNLOCK(husart);

    /* Enable the DMA transfer for transmit request by setting the DMAT bit
       in the USART CR3 register */
    SET_BIT(husart->Instance->CR3, USART_CR3_DMAT);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_USART_Receive_DMA(USART_HandleTypeDef *husart, uint8_t *pRxData, uint16_t Size)
{
  uint32_t *tmp;

  if(husart->State == HAL_USART_STATE_READY)
  {
    if((pRxData == NULL ) || (Size == 0U))
    {
      return HAL_ERROR;
    }

    /* Process Locked */
    __HAL_LOCK(husart);

    husart->pRxBuffPtr = pRxData;
    husart->RxXferSize = Size;
    husart->pTxBuffPtr = pRxData;
    husart->TxXferSize = Size;

    husart->ErrorCode = HAL_USART_ERROR_NONE;
    husart->State = HAL_USART_STATE_BUSY_RX;

    /* Set the USART DMA Rx transfer complete callback */
    husart->hdmarx->XferCpltCallback = USART_DMAReceiveCplt;

    /* Set the USART DMA Half transfer complete callback */
    husart->hdmarx->XferHalfCpltCallback = USART_DMARxHalfCplt;

    /* Set the USART DMA Rx transfer error callback */
    husart->hdmarx->XferErrorCallback = USART_DMAError;
    
    /* Set the DMA abort callback */
    husart->hdmatx->XferAbortCallback = NULL;
    
    /* Set the USART Tx DMA transfer complete callback as NULL because the communication closing
    is performed in DMA reception complete callback  */
    husart->hdmatx->XferHalfCpltCallback = NULL;
    husart->hdmatx->XferCpltCallback = NULL;
    
    /* Set the DMA error callback */
    husart->hdmatx->XferErrorCallback = USART_DMAError;

    /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
    SET_BIT(husart->Instance->CR3, USART_CR3_EIE);
    SET_BIT(husart->Instance->ISR, (USART_ISR_PE | USART_ISR_FE | USART_ISR_NE | USART_ISR_ORE));

    /* Enable the USART receive DMA channel */
    tmp = (uint32_t*)&pRxData;
    HAL_DMA_Start_IT(husart->hdmarx, (uint32_t)&husart->Instance->RDR, *(uint32_t*)tmp, Size);

    /* Enable the USART transmit DMA channel: the transmit stream is used in order
       to generate in the non-blocking mode the clock to the slave device,
       this mode isn't a simplex receive mode but a full-duplex receive mode */
    HAL_DMA_Start_IT(husart->hdmatx, *(uint32_t*)tmp, (uint32_t)&husart->Instance->TDR, Size);
    
    /* Process Unlocked */
    __HAL_UNLOCK(husart);
    
    /* Enable the USART Parity Error Interrupt */
    SET_BIT(husart->Instance->CR1, USART_CR1_PEIE);
    
    /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
    SET_BIT(husart->Instance->CR3, USART_CR3_EIE);

    /* Enable the DMA transfer for the receiver request by setting the DMAR bit
       in the USART CR3 register */
    SET_BIT(husart->Instance->CR3, USART_CR3_DMAR);

    /* Enable the DMA transfer for transmit request by setting the DMAT bit
       in the USART CR3 register */
    SET_BIT(husart->Instance->CR3, USART_CR3_DMAT);


    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_USART_TransmitReceive_DMA(USART_HandleTypeDef *husart, uint8_t *pTxData, uint8_t *pRxData, uint16_t Size)
{
  uint32_t *tmp;

  if(husart->State == HAL_USART_STATE_READY)
  {
    if((pTxData == NULL) || (pRxData == NULL) || (Size == 0U))
    {
      return HAL_ERROR;
    }
    /* Process Locked */
    __HAL_LOCK(husart);

    husart->pRxBuffPtr = pRxData;
    husart->RxXferSize = Size;
    husart->pTxBuffPtr = pTxData;
    husart->TxXferSize = Size;

    husart->ErrorCode = HAL_USART_ERROR_NONE;
    husart->State = HAL_USART_STATE_BUSY_TX_RX;

    /* Set the USART DMA Rx transfer complete callback */
    husart->hdmarx->XferCpltCallback = USART_DMAReceiveCplt;

    /* Set the USART DMA Half transfer complete callback */
    husart->hdmarx->XferHalfCpltCallback = USART_DMARxHalfCplt;

    /* Set the USART DMA Tx transfer complete callback */
    husart->hdmatx->XferCpltCallback = USART_DMATransmitCplt;

    /* Set the USART DMA Half transfer complete callback */
    husart->hdmatx->XferHalfCpltCallback = USART_DMATxHalfCplt;

    /* Set the USART DMA Tx transfer error callback */
    husart->hdmatx->XferErrorCallback = USART_DMAError;

    /* Set the USART DMA Rx transfer error callback */
    husart->hdmarx->XferErrorCallback = USART_DMAError;

    /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
    SET_BIT(husart->Instance->CR3, USART_CR3_EIE);
    SET_BIT(husart->Instance->ISR, (USART_ISR_PE | USART_ISR_FE | USART_ISR_NE | USART_ISR_ORE));

    /* Enable the USART receive DMA channel */
    tmp = (uint32_t*)&pRxData;
    HAL_DMA_Start_IT(husart->hdmarx, (uint32_t)&husart->Instance->RDR, *(uint32_t*)tmp, Size);

    /* Enable the USART transmit DMA channel */
    tmp = (uint32_t*)&pTxData;
    HAL_DMA_Start_IT(husart->hdmatx, *(uint32_t*)tmp, (uint32_t)&husart->Instance->TDR, Size);

    /* Clear the TC flag in the SR register by writing 0 to it */
    __HAL_USART_CLEAR_IT(husart, USART_FLAG_TC);
    
    /* Process Unlocked */
    __HAL_UNLOCK(husart);
    
    /* Enable the USART Parity Error Interrupt */
    SET_BIT(husart->Instance->CR1, USART_CR1_PEIE);
    
    /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
    SET_BIT(husart->Instance->CR3, USART_CR3_EIE);

    /* Enable the DMA transfer for the receiver request by setting the DMAR bit
       in the USART CR3 register */
    SET_BIT(husart->Instance->CR3, USART_CR3_DMAR);

    /* Enable the DMA transfer for transmit request by setting the DMAT bit
       in the USART CR3 register */
    SET_BIT(husart->Instance->CR3, USART_CR3_DMAT);

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

HAL_StatusTypeDef HAL_USART_DMAPause(USART_HandleTypeDef *husart)
{
  /* Process Locked */
  __HAL_LOCK(husart);

  if(husart->State == HAL_USART_STATE_BUSY_TX)
  {
    /* Disable the USART DMA Tx request */
    CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  }
  else if(husart->State == HAL_USART_STATE_BUSY_RX)
  {
    /* Disable RXNE, PE and ERR (Frame error, noise error, overrun error) interrupts */
    CLEAR_BIT(husart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE));
    CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
    /* Disable the USART DMA Rx request */
    CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAR);
  }
  else if(husart->State == HAL_USART_STATE_BUSY_TX_RX)
  {
    /* Disable the USART DMA Tx request */
    CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAR);
    /* Disable the USART DMA Rx request */
    CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  }

  /* Process Unlocked */
  __HAL_UNLOCK(husart);

  return HAL_OK;
}

HAL_StatusTypeDef HAL_USART_DMAResume(USART_HandleTypeDef *husart)
{
  /* Process Locked */
  __HAL_LOCK(husart);

  if(husart->State == HAL_USART_STATE_BUSY_TX)
  {
    /* Enable the USART DMA Tx request */
    SET_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  }
  else if(husart->State == HAL_USART_STATE_BUSY_RX)
  {
    /* Clear the Overrun flag before resuming the Rx transfer*/
    __HAL_USART_CLEAR_IT(husart, USART_CLEAR_OREF);
    
    /* Reenable RXNE, PE and ERR (Frame error, noise error, overrun error) interrupts */
    SET_BIT(husart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE));
    SET_BIT(husart->Instance->CR3, USART_CR3_EIE);

    /* Enable the USART DMA Rx request */
    SET_BIT(husart->Instance->CR3, USART_CR3_DMAR);
  }
  else if(husart->State == HAL_USART_STATE_BUSY_TX_RX)
  {
    /* Clear the Overrun flag before resuming the Rx transfer*/
    __HAL_USART_CLEAR_IT(husart, USART_CLEAR_OREF);

    /* Enable the USART DMA Rx request  before the DMA Tx request */
    SET_BIT(husart->Instance->CR3, USART_CR3_DMAR);

    /* Enable the USART DMA Tx request */
    SET_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  }

  /* Process Unlocked */
  __HAL_UNLOCK(husart);

  return HAL_OK;
}

HAL_StatusTypeDef HAL_USART_DMAStop(USART_HandleTypeDef *husart)
{
  /* The Lock is not implemented on this API to allow the user application
     to call the HAL USART API under callbacks HAL_USART_TxCpltCallback() / HAL_USART_RxCpltCallback() /
     HAL_USART_TxHalfCpltCallback / HAL_USART_RxHalfCpltCallback: 
     indeed, when HAL_DMA_Abort() API is called, the DMA TX/RX Transfer or Half Transfer complete  
     interrupt is generated if the DMA transfer interruption occurs at the middle or at the end of 
     the stream and the corresponding call back is executed. */

  /* Stop USART DMA Tx request if ongoing */
  if ((husart->State == HAL_USART_STATE_BUSY_TX) &&
      (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAT)))
  {
    USART_EndTxTransfer(husart);
    
    /* Abort the USART DMA Tx channel */
    if(husart->hdmatx != NULL)
    {
      HAL_DMA_Abort(husart->hdmatx);
    }
    
    /* Disable the USART Tx DMA request */
    CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  }
  
  /* Stop USART DMA Rx request if ongoing */
  if ((husart->State == HAL_USART_STATE_BUSY_RX) &&
      (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR)))
  {
    USART_EndRxTransfer(husart);
    
    /* Abort the USART DMA Rx channel */
    if(husart->hdmarx != NULL)
    {
      HAL_DMA_Abort(husart->hdmarx);
    }
    
    /* Disable the USART Rx DMA request */
    CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAR);
  }
  
  return HAL_OK;
}

void HAL_USART_IRQHandler(USART_HandleTypeDef *husart)
{
  uint32_t isrflags = READ_REG(husart->Instance->ISR);
  uint32_t cr1its   = READ_REG(husart->Instance->CR1);
  uint32_t cr3its   = READ_REG(husart->Instance->CR3);
  uint32_t errorflags;
  
  /* If no error occurs */
  errorflags = (isrflags & (uint32_t)(USART_ISR_PE | USART_ISR_FE | USART_ISR_ORE | USART_ISR_NE));
  if (errorflags == RESET)
  {
    /* USART in mode Receiver --------------------------------------------------*/
    if(((isrflags & USART_ISR_RXNE) != RESET) && ((cr1its & USART_CR1_RXNEIE) != RESET))
    {
      if(husart->State == HAL_USART_STATE_BUSY_RX)
      {
        USART_Receive_IT(husart);
      }
      else
      {
        USART_TransmitReceive_IT(husart);
      }
    }
  }
  
  /* If some errors occur */
  if((errorflags != RESET) && ((cr3its & (USART_CR3_EIE | USART_CR1_PEIE)) != RESET))
  {
    
    /* USART parity error interrupt occurred ------------------------------------*/
    if(((isrflags & USART_ISR_PE) != RESET) && ((cr1its & USART_CR1_PEIE) != RESET))
    {
      __HAL_USART_CLEAR_IT(husart, USART_CLEAR_PEF);
      husart->ErrorCode |= HAL_USART_ERROR_PE;
    }
    
    /* USART frame error interrupt occurred -------------------------------------*/
    if(((isrflags & USART_ISR_FE) != RESET) && ((cr3its & USART_CR3_EIE) != RESET))
    {
      __HAL_USART_CLEAR_IT(husart, USART_CLEAR_FEF);
      husart->ErrorCode |= HAL_USART_ERROR_FE;
    }
    
    /* USART noise error interrupt occurred -------------------------------------*/
    if(((isrflags & USART_ISR_NE) != RESET) && ((cr3its & USART_CR3_EIE) != RESET))
    {
      __HAL_USART_CLEAR_IT(husart, USART_CLEAR_NEF);
      husart->ErrorCode |= HAL_USART_ERROR_NE;
    }
    
    /* USART Over-Run interrupt occurred ----------------------------------------*/
    if(((isrflags & USART_ISR_ORE) != RESET) && ((cr3its & USART_CR3_EIE) != RESET))
    {
      __HAL_USART_CLEAR_IT(husart, USART_CLEAR_OREF);
      husart->ErrorCode |= HAL_USART_ERROR_ORE;
    }
    
    /* Call USART Error Call back function if need be --------------------------*/
    if(husart->ErrorCode != HAL_USART_ERROR_NONE)
    {
      /* USART in mode Receiver ---------------------------------------------------*/
      if(((isrflags & USART_ISR_RXNE) != RESET) && ((cr1its & USART_CR1_RXNEIE) != RESET))
      {
        USART_Receive_IT(husart);
      }
      
      /* If Overrun error occurs, or if any error occurs in DMA mode reception,
      consider error as blocking */
      if (((husart->ErrorCode & HAL_USART_ERROR_ORE) != RESET) ||
          (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR)))
      {  
        /* Blocking error : transfer is aborted
        Set the USART state ready to be able to start again the process,
        Disable Rx Interrupts, and disable Rx DMA request, if ongoing */
        USART_EndRxTransfer(husart);
        
        /* Disable the USART DMA Rx request if enabled */
        if (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR))
        {
          CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAR);
          
          /* Abort the USART DMA Rx channel */
          if(husart->hdmarx != NULL)
          {            
            /* Set the USART DMA Abort callback : 
            will lead to call HAL_USART_ErrorCallback() at end of DMA abort procedure */
            husart->hdmarx->XferAbortCallback = USART_DMAAbortOnError;
            
            /* Abort DMA RX */
            if(HAL_DMA_Abort_IT(husart->hdmarx) != HAL_OK)
            {
              /* Call Directly husart->hdmarx->XferAbortCallback function in case of error */
              husart->hdmarx->XferAbortCallback(husart->hdmarx);
            }
          }
          else
          {
            /* Call user error callback */
            HAL_USART_ErrorCallback(husart);
          }
        }
        else
        {
          /* Call user error callback */
          HAL_USART_ErrorCallback(husart);
        }
      }
      else
      {
        /* Non Blocking error : transfer could go on. 
        Error is notified to user through user error callback */
        HAL_USART_ErrorCallback(husart);
        husart->ErrorCode = HAL_USART_ERROR_NONE;
      }
    }
    return;
    
  } /* End if some error occurs */
  
  /* USART in mode Transmitter -----------------------------------------------*/
  if(((isrflags & USART_ISR_TXE) != RESET) && ((cr1its & USART_CR1_TXEIE) != RESET))
  {
    if(husart->State == HAL_USART_STATE_BUSY_TX)
    {
      USART_Transmit_IT(husart);
    }
    else
    {
      USART_TransmitReceive_IT(husart);
    }
    return;
  }
  
  /* USART in mode Transmitter (transmission end) -----------------------------*/
  if(((isrflags & USART_ISR_TC) != RESET) && ((cr1its & USART_CR1_TCIE) != RESET))
  {
    USART_EndTransmit_IT(husart);
    return;
  }
}

__weak void HAL_USART_TxCpltCallback(USART_HandleTypeDef *husart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(husart);
 
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_USART_TxCpltCallback can be implemented in the user file
   */ 
}

 __weak void HAL_USART_TxHalfCpltCallback(USART_HandleTypeDef *husart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(husart);
 
  /* NOTE: This function should not be modified, when the callback is needed,
           the HAL_USART_TxHalfCpltCallback can be implemented in the user file
   */
}

__weak void HAL_USART_RxCpltCallback(USART_HandleTypeDef *husart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(husart);
 
  /* NOTE: This function should not be modified, when the callback is needed,
           the HAL_USART_RxCpltCallback can be implemented in the user file
   */
}

__weak void HAL_USART_RxHalfCpltCallback(USART_HandleTypeDef *husart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(husart);
 
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_USART_RxHalfCpltCallback can be implemented in the user file
   */
}

__weak void HAL_USART_TxRxCpltCallback(USART_HandleTypeDef *husart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(husart);
 
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_USART_TxRxCpltCallback can be implemented in the user file
   */
}

__weak void HAL_USART_ErrorCallback(USART_HandleTypeDef *husart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(husart);
 
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_USART_ErrorCallback can be implemented in the user file
   */ 
}

HAL_USART_StateTypeDef HAL_USART_GetState(USART_HandleTypeDef *husart)
{
  return husart->State;
}

uint32_t HAL_USART_GetError(USART_HandleTypeDef *husart)
{
  return husart->ErrorCode;
}

static HAL_StatusTypeDef USART_Transmit_IT(USART_HandleTypeDef *husart)
{
  uint16_t* tmp;

  if(husart->State == HAL_USART_STATE_BUSY_TX)
  {

    if(husart->TxXferCount == 0U)
    {
      /* Disable the USART Transmit data register empty interrupt */
      __HAL_USART_DISABLE_IT(husart, USART_IT_TXE);

      /* Enable the USART Transmit Complete Interrupt */
      __HAL_USART_ENABLE_IT(husart, USART_IT_TC);

      return HAL_OK;
    }
    else
    {
      if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
      {
        tmp = (uint16_t*) husart->pTxBuffPtr;
        husart->Instance->TDR = (*tmp & (uint16_t)0x01FFU);
        husart->pTxBuffPtr += 2U;
      }
      else
      {
        husart->Instance->TDR = (uint8_t)(*husart->pTxBuffPtr++ & (uint8_t)0xFF);       
      }

      husart->TxXferCount--;

      return HAL_OK;
    }
  }
  else
  {
    return HAL_BUSY;
  }
}

static HAL_StatusTypeDef USART_EndTransmit_IT(USART_HandleTypeDef *husart)
{
  /* Disable the USART Transmit Complete Interrupt */
  CLEAR_BIT(husart->Instance->CR1, USART_CR1_TCIE);

  /* Disable the USART Error Interrupt: (Frame error, noise error, overrun error) */
  CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);

  husart->State = HAL_USART_STATE_READY;

  HAL_USART_TxCpltCallback(husart);

  return HAL_OK;
}

static HAL_StatusTypeDef USART_Receive_IT(USART_HandleTypeDef *husart)
{
  uint16_t* tmp;
  uint16_t uhMask = husart->Mask;

  if(husart->State == HAL_USART_STATE_BUSY_RX)
  {

    if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
    {
      tmp = (uint16_t*) husart->pRxBuffPtr;
      *tmp = (uint16_t)(husart->Instance->RDR & uhMask);
      husart->pRxBuffPtr += 2U;
    }
    else
    {
      *husart->pRxBuffPtr++ = (uint8_t)(husart->Instance->RDR & (uint8_t)uhMask);
    }
      /* Send dummy byte in order to generate the clock for the Slave to Send the next data */
      husart->Instance->TDR = (DUMMY_DATA & (uint16_t)0x00FFU);

    if(--husart->RxXferCount == 0U)
    {
      CLEAR_BIT(husart->Instance->CR1, USART_CR1_RXNEIE);

      /* Disable the USART Parity Error Interrupt */
      CLEAR_BIT(husart->Instance->CR1, USART_CR1_PEIE);

      /* Disable the USART Error Interrupt: (Frame error, noise error, overrun error) */
      CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);

      husart->State = HAL_USART_STATE_READY;

      HAL_USART_RxCpltCallback(husart);

      return HAL_OK;
    }

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

static HAL_StatusTypeDef USART_TransmitReceive_IT(USART_HandleTypeDef *husart)
{
  uint16_t* tmp;
  uint16_t uhMask = husart->Mask;

  if(husart->State == HAL_USART_STATE_BUSY_TX_RX)
  {
    if(husart->TxXferCount != 0x00U)
    {
      if(__HAL_USART_GET_FLAG(husart, USART_FLAG_TXE) != RESET)
      {
        if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
        {
          tmp = (uint16_t*) husart->pTxBuffPtr;
          husart->Instance->TDR = (uint16_t)(*tmp & uhMask);
          husart->pTxBuffPtr += 2U;
        }
        else
        {
          husart->Instance->TDR = (uint8_t)(*husart->pTxBuffPtr++ & (uint8_t)uhMask);
        }
        husart->TxXferCount--;

        /* Check the latest data transmitted */
        if(husart->TxXferCount == 0U)
        {
           CLEAR_BIT(husart->Instance->CR1, USART_CR1_TXEIE);
        }
      }
    }

    if(husart->RxXferCount != 0x00U)
    {
      if(__HAL_USART_GET_FLAG(husart, USART_FLAG_RXNE) != RESET)
      {
        if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
        {
          tmp = (uint16_t*) husart->pRxBuffPtr;
          *tmp = (uint16_t)(husart->Instance->RDR & uhMask);
          husart->pRxBuffPtr += 2U;
        }
        else
        {
          *husart->pRxBuffPtr++ = (uint8_t)(husart->Instance->RDR & (uint8_t)uhMask);
        }
        husart->RxXferCount--;
      }
    }

    /* Check the latest data received */
    if(husart->RxXferCount == 0U)
    {
      CLEAR_BIT(husart->Instance->CR1, USART_CR1_RXNEIE);

      /* Disable the USART Parity Error Interrupt */
      CLEAR_BIT(husart->Instance->CR1, USART_CR1_PEIE);

      /* Disable the USART Error Interrupt: (Frame error, noise error, overrun error) */
      CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);

      husart->State = HAL_USART_STATE_READY;

      HAL_USART_TxRxCpltCallback(husart);

      return HAL_OK;
    }

    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}

static HAL_StatusTypeDef USART_WaitOnFlagUntilTimeout(USART_HandleTypeDef *husart, uint32_t Flag, FlagStatus Status, uint32_t Tickstart, uint32_t Timeout)  
{
  /* Wait until flag is set */
  while((__HAL_USART_GET_FLAG(husart, Flag) ? SET : RESET) == Status)
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((Timeout == 0U)||((HAL_GetTick()-Tickstart) >=  Timeout))
      {
        /* Disable the USART Transmit Complete Interrupt */
        CLEAR_BIT(husart->Instance->CR1, USART_CR1_TXEIE);
        
        /* Disable the USART RXNE Interrupt */
        CLEAR_BIT(husart->Instance->CR1, USART_CR1_RXNEIE);
        
        /* Disable the USART Parity Error Interrupt */
        CLEAR_BIT(husart->Instance->CR1, USART_CR1_PEIE);
        
        /* Disable the USART Error Interrupt: (Frame error, noise error, overrun error) */
        CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
        
        husart->State= HAL_USART_STATE_READY;
        
        /* Process Unlocked */
        __HAL_UNLOCK(husart);
        
        return HAL_TIMEOUT;
      }
    }
  }
  return HAL_OK;
}


static void USART_DMATransmitCplt(DMA_HandleTypeDef *hdma)
{
  USART_HandleTypeDef* husart = ( USART_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;

  /* DMA Normal mode */
  if((hdma->Instance->CR & DMA_SxCR_CIRC) == 0U)
  { 
    husart->TxXferCount = 0U;

    if(husart->State == HAL_USART_STATE_BUSY_TX)
    {
      /* Disable the DMA transfer for transmit request by resetting the DMAT bit
         in the USART CR3 register */
      CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);

      /* Enable the USART Transmit Complete Interrupt */
      SET_BIT(husart->Instance->CR1, USART_CR1_TCIE);
    }
  }
  /* DMA Circular mode */
  else
  {
    if(husart->State == HAL_USART_STATE_BUSY_TX)
    {
    HAL_USART_TxCpltCallback(husart);
   }
 }
}


static void USART_DMATxHalfCplt(DMA_HandleTypeDef *hdma)
{
  USART_HandleTypeDef* husart = (USART_HandleTypeDef*)((DMA_HandleTypeDef*)hdma)->Parent;

  HAL_USART_TxHalfCpltCallback(husart);
}

static void USART_DMAReceiveCplt(DMA_HandleTypeDef *hdma)
{
  USART_HandleTypeDef* husart = ( USART_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;

  /* DMA Normal mode */
  if((hdma->Instance->CR & DMA_SxCR_CIRC) == 0U)
  { 
    husart->RxXferCount = 0U;
    
    /* Disable RXNE, PE and ERR (Frame error, noise error, overrun error) interrupts */
    CLEAR_BIT(husart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE));
    CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);

    /* Disable the DMA RX transfer for the receiver request by resetting the DMAR bit
    in USART CR3 register */
    CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAR);
    /* similarly, disable the DMA TX transfer that was started to provide the
       clock to the slave device */
    CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);

      if(husart->State == HAL_USART_STATE_BUSY_RX)
      {
        HAL_USART_RxCpltCallback(husart);
      }
      /* The USART state is HAL_USART_STATE_BUSY_TX_RX */
      else
      {
        HAL_USART_TxRxCpltCallback(husart);
      }
    husart->State= HAL_USART_STATE_READY;
  }
  /* DMA circular mode */
  else
  {
    if(husart->State == HAL_USART_STATE_BUSY_RX)
    {
      HAL_USART_RxCpltCallback(husart);
    }
    /* The USART state is HAL_USART_STATE_BUSY_TX_RX */
    else
    {
      HAL_USART_TxRxCpltCallback(husart);
    }
  }
}

static void USART_DMARxHalfCplt(DMA_HandleTypeDef *hdma)
{
  USART_HandleTypeDef* husart = (USART_HandleTypeDef*)((DMA_HandleTypeDef*)hdma)->Parent;

  HAL_USART_RxHalfCpltCallback(husart);
}

static void USART_DMAError(DMA_HandleTypeDef *hdma)
{
  USART_HandleTypeDef* husart = ( USART_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;

  husart->RxXferCount = 0U;
  husart->TxXferCount = 0U;
  
  /* Stop USART DMA Tx request if ongoing */
  if((husart->State == HAL_USART_STATE_BUSY_TX)
     &&(HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAT)))
  {
    USART_EndTxTransfer(husart);
  }
  
  /* Stop USART DMA Rx request if ongoing */
  if((husart->State == HAL_USART_STATE_BUSY_RX)
     &&(HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR)))
  {
    USART_EndRxTransfer(husart);
  }
  
  husart->ErrorCode |= HAL_USART_ERROR_DMA;
  husart->State= HAL_USART_STATE_READY;

  HAL_USART_ErrorCallback(husart);
}

static void USART_DMAAbortOnError(DMA_HandleTypeDef *hdma)
{
  USART_HandleTypeDef* husart = (USART_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;
  husart->RxXferCount = 0U;
  husart->TxXferCount = 0U;
  
  HAL_USART_ErrorCallback(husart);
}

static void USART_EndTxTransfer(USART_HandleTypeDef *husart)
{
  /* At end of Tx process, restore husart->State to Ready */
  husart->State = HAL_USART_STATE_READY;
  
  /* Disable TXEIE and TCIE interrupts */
  CLEAR_BIT(husart->Instance->CR1, (USART_CR1_TXEIE | USART_CR1_TCIE));
}

static void USART_EndRxTransfer(USART_HandleTypeDef *husart)
{
  /* At end of Rx process, restore husart->RxState to Ready */
  husart->State = HAL_USART_STATE_READY;
  
  /* Disable RXNE, PE and ERR interrupts */
  CLEAR_BIT(husart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE));
  CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
}

static HAL_StatusTypeDef USART_SetConfig(USART_HandleTypeDef *husart)
{
  uint32_t tmpreg      = 0x0U;
  USART_ClockSourceTypeDef clocksource = USART_CLOCKSOURCE_UNDEFINED;
  HAL_StatusTypeDef ret                = HAL_OK;
  uint16_t brrtemp                     = 0x0000U;
  uint16_t usartdiv                    = 0x0000U;
  
  /* Check the parameters */
  assert_param(IS_USART_POLARITY(husart->Init.CLKPolarity));
  assert_param(IS_USART_PHASE(husart->Init.CLKPhase));
  assert_param(IS_USART_LASTBIT(husart->Init.CLKLastBit));
  assert_param(IS_USART_BAUDRATE(husart->Init.BaudRate));  
  assert_param(IS_USART_WORD_LENGTH(husart->Init.WordLength));
  assert_param(IS_USART_STOPBITS(husart->Init.StopBits));
  assert_param(IS_USART_PARITY(husart->Init.Parity));
  assert_param(IS_USART_MODE(husart->Init.Mode));
  assert_param(IS_USART_OVERSAMPLING(husart->Init.OverSampling));   


  /*-------------------------- USART CR1 Configuration -----------------------*/
   /* Clear M, PCE, PS, TE and RE bits and configure       
   *  the USART Word Length, Parity, Mode and OverSampling: 
   *  set the M bits according to husart->Init.WordLength value 
   *  set PCE and PS bits according to husart->Init.Parity value
   *  set TE and RE bits according to husart->Init.Mode value
   *  force OVER8 to 1 to allow to reach the maximum speed (Fclock/8) */
  tmpreg = (uint32_t)husart->Init.WordLength | husart->Init.Parity | husart->Init.Mode | USART_CR1_OVER8;
  MODIFY_REG(husart->Instance->CR1, USART_CR1_FIELDS, tmpreg);
  
  /*---------------------------- USART CR2 Configuration ---------------------*/
  /* Clear and configure the USART Clock, CPOL, CPHA, LBCL and STOP bits:
   * set CPOL bit according to husart->Init.CLKPolarity value
   * set CPHA bit according to husart->Init.CLKPhase value
   * set LBCL bit according to husart->Init.CLKLastBit value
   * set STOP[13:12] bits according to husart->Init.StopBits value */
  tmpreg = (uint32_t)(USART_CLOCK_ENABLE); 
  tmpreg |= ((uint32_t)husart->Init.CLKPolarity | (uint32_t)husart->Init.CLKPhase);
  tmpreg |= ((uint32_t)husart->Init.CLKLastBit | (uint32_t)husart->Init.StopBits);
  MODIFY_REG(husart->Instance->CR2, USART_CR2_FIELDS, tmpreg);

  /*-------------------------- USART CR3 Configuration -----------------------*/
  /* no CR3 register configuration                                            */

  /*-------------------------- USART BRR Configuration -----------------------*/
  /* BRR is filled-up according to OVER8 bit setting which is forced to 1     */
  USART_GETCLOCKSOURCE(husart, clocksource);
  switch (clocksource)
  {
    case USART_CLOCKSOURCE_PCLK1:
      usartdiv = (uint16_t)(((2*HAL_RCC_GetPCLK1Freq()) + (husart->Init.BaudRate/2))/ husart->Init.BaudRate);
      break;
    case USART_CLOCKSOURCE_PCLK2:
      usartdiv = (uint16_t)(((2*HAL_RCC_GetPCLK2Freq()) + (husart->Init.BaudRate/2))/ husart->Init.BaudRate);
      break;
    case USART_CLOCKSOURCE_HSI:
      usartdiv = (uint16_t)(((2*HSI_VALUE) + (husart->Init.BaudRate/2))/ husart->Init.BaudRate);
      break;
    case USART_CLOCKSOURCE_SYSCLK:
      usartdiv = (uint16_t)(((2*HAL_RCC_GetSysClockFreq()) + (husart->Init.BaudRate/2))/ husart->Init.BaudRate);
      break;
    case USART_CLOCKSOURCE_LSE:
      usartdiv = (uint16_t)(((2*LSE_VALUE) + (husart->Init.BaudRate/2))/ husart->Init.BaudRate);
      break;
    case USART_CLOCKSOURCE_UNDEFINED:
    default:
      ret = HAL_ERROR;
      break;
  } 
  
  brrtemp = usartdiv & 0xFFF0U;
  brrtemp |= (uint16_t)((usartdiv & (uint16_t)0x000FU) >> 1U);
  husart->Instance->BRR = brrtemp;
  
  return ret; 
}

static HAL_StatusTypeDef USART_CheckIdleState(USART_HandleTypeDef *husart)
{
  uint32_t tickstart = 0U;
    
   /* Initialize the USART ErrorCode */
  husart->ErrorCode = HAL_USART_ERROR_NONE;
  
  /* Init tickstart for timeout managment*/
  tickstart = HAL_GetTick();
  
  /* Check if the Transmitter is enabled */
  if((husart->Instance->CR1 & USART_CR1_TE) == USART_CR1_TE)
  {
    /* Wait until TEACK flag is set */
    if(USART_WaitOnFlagUntilTimeout(husart, USART_ISR_TEACK, RESET, tickstart, TEACK_REACK_TIMEOUT) != HAL_OK)  
    { 
      husart->State= HAL_USART_STATE_TIMEOUT;      
      return HAL_TIMEOUT;
    } 
  }
  /* Check if the Receiver is enabled */
  if((husart->Instance->CR1 & USART_CR1_RE) == USART_CR1_RE)
  {
    /* Wait until REACK flag is set */
    if(USART_WaitOnFlagUntilTimeout(husart, USART_ISR_REACK, RESET, tickstart, TEACK_REACK_TIMEOUT) != HAL_OK)  
    { 
      husart->State= HAL_USART_STATE_TIMEOUT;       
      return HAL_TIMEOUT;
    }
  }
  
  /* Initialize the USART state*/
  husart->State= HAL_USART_STATE_READY;
  
  /* Process Unlocked */
  __HAL_UNLOCK(husart);
  
  return HAL_OK;  
}

#endif /* HAL_USART_MODULE_ENABLED */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/