static void UART_RxISR_8BIT_FIFOEN()

in CMake-armcc/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_uart.c [4481:4613]

• 85 lines of code
• 16 McCabe index (conditional complexity)

static void UART_RxISR_8BIT_FIFOEN(UART_HandleTypeDef *huart)
{
  uint16_t  uhMask = huart->Mask;
  uint16_t  uhdata;
  uint16_t  nb_rx_data;
  uint16_t  rxdatacount;
  uint32_t  isrflags = READ_REG(huart->Instance->ISR);
  uint32_t  cr1its   = READ_REG(huart->Instance->CR1);
  uint32_t  cr3its   = READ_REG(huart->Instance->CR3);

  /* Check that a Rx process is ongoing */
  if (huart->RxState == HAL_UART_STATE_BUSY_RX)
  {
    nb_rx_data = huart->NbRxDataToProcess;
    while ((nb_rx_data > 0U) && ((isrflags & USART_ISR_RXNE_RXFNE) != 0U))
    {
      uhdata = (uint16_t) READ_REG(huart->Instance->RDR);
      *huart->pRxBuffPtr = (uint8_t)(uhdata & (uint8_t)uhMask);
      huart->pRxBuffPtr++;
      huart->RxXferCount--;
      isrflags = READ_REG(huart->Instance->ISR);

      /* If some non blocking errors occurred */
      if ((isrflags & (USART_ISR_PE | USART_ISR_FE | USART_ISR_NE)) != 0U)
      {
        /* UART parity error interrupt occurred -------------------------------------*/
        if (((isrflags & USART_ISR_PE) != 0U) && ((cr1its & USART_CR1_PEIE) != 0U))
        {
          __HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_PEF);

          huart->ErrorCode |= HAL_UART_ERROR_PE;
        }

        /* UART frame error interrupt occurred --------------------------------------*/
        if (((isrflags & USART_ISR_FE) != 0U) && ((cr3its & USART_CR3_EIE) != 0U))
        {
          __HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_FEF);

          huart->ErrorCode |= HAL_UART_ERROR_FE;
        }

        /* UART noise error interrupt occurred --------------------------------------*/
        if (((isrflags & USART_ISR_NE) != 0U) && ((cr3its & USART_CR3_EIE) != 0U))
        {
          __HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_NEF);

          huart->ErrorCode |= HAL_UART_ERROR_NE;
        }

        /* Call UART Error Call back function if need be ----------------------------*/
        if (huart->ErrorCode != HAL_UART_ERROR_NONE)
        {
          /* Non Blocking error : transfer could go on.
          Error is notified to user through user error callback */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
          /*Call registered error callback*/
          huart->ErrorCallback(huart);
#else
          /*Call legacy weak error callback*/
          HAL_UART_ErrorCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
          huart->ErrorCode = HAL_UART_ERROR_NONE;
        }
      }

      if (huart->RxXferCount == 0U)
      {
        /* Disable the UART Parity Error Interrupt and RXFT interrupt*/
        CLEAR_BIT(huart->Instance->CR1, USART_CR1_PEIE);

        /* Disable the UART Error Interrupt: (Frame error, noise error, overrun error)
           and RX FIFO Threshold interrupt */
        CLEAR_BIT(huart->Instance->CR3, (USART_CR3_EIE | USART_CR3_RXFTIE));

        /* Rx process is completed, restore huart->RxState to Ready */
        huart->RxState = HAL_UART_STATE_READY;

        /* Clear RxISR function pointer */
        huart->RxISR = NULL;

        /* Check current reception Mode :
           If Reception till IDLE event has been selected : */
        if (huart->ReceptionType == HAL_UART_RECEPTION_TOIDLE)
        {
          /* Disable IDLE interrupt */
          CLEAR_BIT(huart->Instance->CR1, USART_CR1_IDLEIE);

#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
          /*Call registered Rx Event callback*/
          huart->RxEventCallback(huart, huart->RxXferSize);
#else
          /*Call legacy weak Rx Event callback*/
          HAL_UARTEx_RxEventCallback(huart, huart->RxXferSize);
#endif
        }
        else
        {
          /* Standard reception API called */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
          /*Call registered Rx complete callback*/
          huart->RxCpltCallback(huart);
#else
          /*Call legacy weak Rx complete callback*/
          HAL_UART_RxCpltCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
        }
        huart->ReceptionType = HAL_UART_RECEPTION_STANDARD;
      }
    }

    /* When remaining number of bytes to receive is less than the RX FIFO
    threshold, next incoming frames are processed as if FIFO mode was
    disabled (i.e. one interrupt per received frame).
    */
    rxdatacount = huart->RxXferCount;
    if ((rxdatacount != 0U) && (rxdatacount < huart->NbRxDataToProcess))
    {
      /* Disable the UART RXFT interrupt*/
      CLEAR_BIT(huart->Instance->CR3, USART_CR3_RXFTIE);

      /* Update the RxISR function pointer */
      huart->RxISR = UART_RxISR_8BIT;

      /* Enable the UART Data Register Not Empty interrupt */
      SET_BIT(huart->Instance->CR1, USART_CR1_RXNEIE_RXFNEIE);
    }
  }
  else
  {
    /* Clear RXNE interrupt flag */
    __HAL_UART_SEND_REQ(huart, UART_RXDATA_FLUSH_REQUEST);
  }
}