stm8s_uart3.c

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/**
  ********************************************************************************
  * @file    stm8s_uart3.c
  * @author  MCD Application Team
  * @version V2.3.0
  * @date    16-June-2017
  * @brief   This file contains all the functions for the uart3 peripheral.
   ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm8s_uart3.h"

/** @addtogroup STM8S_StdPeriph_Driver
  * @{
  */
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/
/* Public functions ----------------------------------------------------------*/

/**
  * @addtogroup UART3_Public_Functions
  * @{
  */

/**
  * @brief  Deinitializes the UART peripheral.
  * @param  None
  * @retval None
  */

void UART3_DeInit(void)
{
  /* Clear the Idle Line Detected bit in the status rerister by a read
  to the UART3_SR register followed by a Read to the UART3_DR register */
  (void) UART3->SR;
  (void) UART3->DR;
  
  UART3->BRR2 = UART3_BRR2_RESET_VALUE; /*Set UART3_BRR2 to reset value 0x00 */
  UART3->BRR1 = UART3_BRR1_RESET_VALUE; /*Set UART3_BRR1 to reset value 0x00 */
  
  UART3->CR1 = UART3_CR1_RESET_VALUE;  /*Set UART3_CR1 to reset value 0x00  */
  UART3->CR2 = UART3_CR2_RESET_VALUE;  /*Set UART3_CR2 to reset value 0x00  */
  UART3->CR3 = UART3_CR3_RESET_VALUE;  /*Set UART3_CR3 to reset value 0x00  */
  UART3->CR4 = UART3_CR4_RESET_VALUE;  /*Set UART3_CR4 to reset value 0x00  */
  UART3->CR6 = UART3_CR6_RESET_VALUE;  /*Set UART3_CR6 to reset value 0x00  */
}

/**
  * @brief  Initializes the UART3 according to the specified parameters.
  * @param  BaudRate: The baudrate.
  * @param  WordLength : This parameter can be any of 
  *         the @ref UART3_WordLength_TypeDef enumeration.
  * @param  StopBits: This parameter can be any of the 
  *         @ref UART3_StopBits_TypeDef enumeration.
  * @param  Parity: This parameter can be any of the 
  *         @ref UART3_Parity_TypeDef enumeration.
  * @param  Mode: This parameter can be any of the @ref UART3_Mode_TypeDef values
  * @retval None
  */
void UART3_Init(uint32_t BaudRate, UART3_WordLength_TypeDef WordLength, 
                UART3_StopBits_TypeDef StopBits, UART3_Parity_TypeDef Parity, 
                UART3_Mode_TypeDef Mode)
{
  uint8_t BRR2_1 = 0, BRR2_2 = 0;
  uint32_t BaudRate_Mantissa = 0, BaudRate_Mantissa100 = 0;
  
  /* Check the parameters */
  assert_param(IS_UART3_WORDLENGTH_OK(WordLength));
  assert_param(IS_UART3_STOPBITS_OK(StopBits));
  assert_param(IS_UART3_PARITY_OK(Parity));
  assert_param(IS_UART3_BAUDRATE_OK(BaudRate));
  assert_param(IS_UART3_MODE_OK((uint8_t)Mode));
  
  /* Clear the word length bit */
  UART3->CR1 &= (uint8_t)(~UART3_CR1_M);     
  /* Set the word length bit according to UART3_WordLength value */
  UART3->CR1 |= (uint8_t)WordLength; 
  
  /* Clear the STOP bits */
  UART3->CR3 &= (uint8_t)(~UART3_CR3_STOP);  
  /* Set the STOP bits number according to UART3_StopBits value  */
  UART3->CR3 |= (uint8_t)StopBits;  
  
  /* Clear the Parity Control bit */
  UART3->CR1 &= (uint8_t)(~(UART3_CR1_PCEN | UART3_CR1_PS));  
  /* Set the Parity Control bit to UART3_Parity value */
  UART3->CR1 |= (uint8_t)Parity;     
  
  /* Clear the LSB mantissa of UART3DIV  */
  UART3->BRR1 &= (uint8_t)(~UART3_BRR1_DIVM);  
  /* Clear the MSB mantissa of UART3DIV  */
  UART3->BRR2 &= (uint8_t)(~UART3_BRR2_DIVM);  
  /* Clear the Fraction bits of UART3DIV */
  UART3->BRR2 &= (uint8_t)(~UART3_BRR2_DIVF);  
  
  /* Set the UART3 BaudRates in BRR1 and BRR2 registers according to UART3_BaudRate value */
  BaudRate_Mantissa    = ((uint32_t)CLK_GetClockFreq() / (BaudRate << 4));
  BaudRate_Mantissa100 = (((uint32_t)CLK_GetClockFreq() * 100) / (BaudRate << 4));
  /* The fraction and MSB mantissa should be loaded in one step in the BRR2 register */
  /* Set the fraction of UART3DIV  */
  BRR2_1 = (uint8_t)((uint8_t)(((BaudRate_Mantissa100 - (BaudRate_Mantissa * 100))
                                << 4) / 100) & (uint8_t)0x0F); 
  BRR2_2 = (uint8_t)((BaudRate_Mantissa >> 4) & (uint8_t)0xF0);
  
  UART3->BRR2 = (uint8_t)(BRR2_1 | BRR2_2);
  /* Set the LSB mantissa of UART3DIV  */
  UART3->BRR1 = (uint8_t)BaudRate_Mantissa;           
  
  if ((uint8_t)(Mode & UART3_MODE_TX_ENABLE))
  {
    /* Set the Transmitter Enable bit */
    UART3->CR2 |= UART3_CR2_TEN;  
  }
  else
  {
    /* Clear the Transmitter Disable bit */
    UART3->CR2 &= (uint8_t)(~UART3_CR2_TEN);  
  }
  if ((uint8_t)(Mode & UART3_MODE_RX_ENABLE))
  {
    /* Set the Receiver Enable bit */
    UART3->CR2 |= UART3_CR2_REN;  
  }
  else
  {
    /* Clear the Receiver Disable bit */
    UART3->CR2 &= (uint8_t)(~UART3_CR2_REN);  
  }
}

/**
  * @brief  Enable the UART1 peripheral.
  * @param  NewState : The new state of the UART Communication.
  *         This parameter can be any of the @ref FunctionalState enumeration.
  * @retval None
  */
void UART3_Cmd(FunctionalState NewState)
{
  if (NewState != DISABLE)
  {
    /* UART3 Enable */
    UART3->CR1 &= (uint8_t)(~UART3_CR1_UARTD); 
  }
  else
  {
    /* UART3 Disable */
    UART3->CR1 |= UART3_CR1_UARTD;  
  }
}

/**
  * @brief  Enables or disables the specified UART3 interrupts.
  * @param  UART3_IT specifies the UART3 interrupt sources to be enabled or disabled.
  *         This parameter can be one of the following values:
  *         - UART3_IT_LBDF:  LIN Break detection interrupt
  *         - UART3_IT_LHDF:  LIN Break detection interrupt
  *         - UART3_IT_TXE:  Transmit Data Register empty interrupt
  *         - UART3_IT_TC:   Transmission complete interrupt
  *         - UART3_IT_RXNE_OR: Receive Data register not empty/Over run error interrupt
  *         - UART3_IT_IDLE: Idle line detection interrupt
  *         - UART3_IT_PE:   Parity Error interrupt
  * @param  NewState new state of the specified UART3 interrupts.
  *         This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void UART3_ITConfig(UART3_IT_TypeDef UART3_IT, FunctionalState NewState)
{
  uint8_t uartreg = 0, itpos = 0x00;
  
  /* Check the parameters */
  assert_param(IS_UART3_CONFIG_IT_OK(UART3_IT));
  assert_param(IS_FUNCTIONALSTATE_OK(NewState));
  
  /* Get the UART3 register index */
  uartreg = (uint8_t)((uint16_t)UART3_IT >> 0x08);
  
  /* Get the UART3 IT index */
  itpos = (uint8_t)((uint8_t)1 << (uint8_t)((uint8_t)UART3_IT & (uint8_t)0x0F));
  
  if (NewState != DISABLE)
  {
    /* Enable the Interrupt bits according to UART3_IT mask */
    if (uartreg == 0x01)
    {
      UART3->CR1 |= itpos;
    }
    else if (uartreg == 0x02)
    {
      UART3->CR2 |= itpos;
    }
    else if (uartreg == 0x03)
    {
      UART3->CR4 |= itpos;
    }
    else
    {
      UART3->CR6 |= itpos;
    }
  }
  else
  {
    /* Disable the interrupt bits according to UART3_IT mask */
    if (uartreg == 0x01)
    {
      UART3->CR1 &= (uint8_t)(~itpos);
    }
    else if (uartreg == 0x02)
    {
      UART3->CR2 &= (uint8_t)(~itpos);
    }
    else if (uartreg == 0x03)
    {
      UART3->CR4 &= (uint8_t)(~itpos);
    }
    else
    {
      UART3->CR6 &= (uint8_t)(~itpos);
    }
  }
}

/**
  * @brief  Sets the UART3 LIN Break detection length.
  * @param  UART3_LINBreakDetectionLength specifies the LIN break detection length.
  *         This parameter can be any of the 
  *         @ref UART3_LINBreakDetectionLength_TypeDef values.
  * @retval None
  */
void UART3_LINBreakDetectionConfig(UART3_LINBreakDetectionLength_TypeDef UART3_LINBreakDetectionLength)
{
  /* Check the parameters */
  assert_param(IS_UART3_LINBREAKDETECTIONLENGTH_OK(UART3_LINBreakDetectionLength));
  
  if (UART3_LINBreakDetectionLength != UART3_LINBREAKDETECTIONLENGTH_10BITS)
  {
    UART3->CR4 |= UART3_CR4_LBDL;
  }
  else
  {
    UART3->CR4 &= ((uint8_t)~UART3_CR4_LBDL);
  }
}

/**
  * @brief  Configure the UART3 peripheral.
  * @param  UART3_Mode specifies the LIN mode.
  *         This parameter can be any of the @ref UART3_LinMode_TypeDef values.
  * @param  UART3_Autosync specifies the LIN automatic resynchronization mode.
  *         This parameter can be any of the @ref UART3_LinAutosync_TypeDef values.
  * @param  UART3_DivUp specifies the LIN divider update method.
  *         This parameter can be any of the @ref UART3_LinDivUp_TypeDef values.
  * @retval None
  */
void UART3_LINConfig(UART3_LinMode_TypeDef UART3_Mode,
                     UART3_LinAutosync_TypeDef UART3_Autosync, 
                     UART3_LinDivUp_TypeDef UART3_DivUp)
{
  /* Check the parameters */
  assert_param(IS_UART3_SLAVE_OK(UART3_Mode));
  assert_param(IS_UART3_AUTOSYNC_OK(UART3_Autosync));
  assert_param(IS_UART3_DIVUP_OK(UART3_DivUp));
  
  if (UART3_Mode != UART3_LIN_MODE_MASTER)
  {
    UART3->CR6 |=  UART3_CR6_LSLV;
  }
  else
  {
    UART3->CR6 &= ((uint8_t)~UART3_CR6_LSLV);
  }
  
  if (UART3_Autosync != UART3_LIN_AUTOSYNC_DISABLE)
  {
    UART3->CR6 |=  UART3_CR6_LASE ;
  }
  else
  {
    UART3->CR6 &= ((uint8_t)~ UART3_CR6_LASE );
  }
  
  if (UART3_DivUp != UART3_LIN_DIVUP_LBRR1)
  {
    UART3->CR6 |=  UART3_CR6_LDUM;
  }
  else
  {
    UART3->CR6 &= ((uint8_t)~ UART3_CR6_LDUM);
  }
}

/**
  * @brief  Enables or disables the UART3 LIN mode.
  * @param  NewState is new state of the UART3 LIN mode.
  *         This parameter can be ENABLE or DISABLE
  * @retval None
  */
void UART3_LINCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONALSTATE_OK(NewState));
  
  if (NewState != DISABLE)
  {
    /* Enable the LIN mode by setting the LINE bit in the CR2 register */
    UART3->CR3 |= UART3_CR3_LINEN;
  }
  else
  {
    /* Disable the LIN mode by clearing the LINE bit in the CR2 register */
    UART3->CR3 &= ((uint8_t)~UART3_CR3_LINEN);
  }
}

/**
  * @brief  Selects the UART3 WakeUp method.
  * @param  UART3_WakeUp: specifies the UART3 wakeup method.
  *         This parameter can be any of the @ref UART3_WakeUp_TypeDef values.
  * @retval None
  */
void UART3_WakeUpConfig(UART3_WakeUp_TypeDef UART3_WakeUp)
{
  /* Check the parameters */
  assert_param(IS_UART3_WAKEUP_OK(UART3_WakeUp));
  
  UART3->CR1 &= ((uint8_t)~UART3_CR1_WAKE);
  UART3->CR1 |= (uint8_t)UART3_WakeUp;
}

/**
  * @brief  Determines if the UART3 is in mute mode or not.
  * @param  NewState: new state of the UART3 mode.
  *         This parameter can be ENABLE or DISABLE
  * @retval None
  */
void UART3_ReceiverWakeUpCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONALSTATE_OK(NewState));
  
  if (NewState != DISABLE)
  {
    /* Enable the mute mode UART3 by setting the RWU bit in the CR2 register */
    UART3->CR2 |= UART3_CR2_RWU;
  }
  else
  {
    /* Disable the mute mode UART3 by clearing the RWU bit in the CR1 register */
    UART3->CR2 &= ((uint8_t)~UART3_CR2_RWU);
  }
}

/**
  * @brief  Returns the most recent received data by the UART3 peripheral.
  * @param  None
  * @retval Received Data
  */
uint8_t UART3_ReceiveData8(void)
{
  return ((uint8_t)UART3->DR);
}

/**
  * @brief  Returns the most recent received data by the UART3 peripheral.
  * @param  None
  * @retval Received Data
  */
uint16_t UART3_ReceiveData9(void)
{
  uint16_t temp = 0;
  
  temp = (uint16_t)(((uint16_t)((uint16_t)UART3->CR1 & (uint16_t)UART3_CR1_R8)) << 1);
  return (uint16_t)((((uint16_t)UART3->DR) | temp) & ((uint16_t)0x01FF));
}

/**
  * @brief  Transmits 8 bit data through the UART3 peripheral.
  * @param  Data the data to transmit.
  * @retval None
  */
void UART3_SendData8(uint8_t Data)
{
  /* Transmit Data */
  UART3->DR = Data;
}

/**
  * @brief  Transmits 9 bit data through the UART3 peripheral.
  * @param   Data: the data to transmit.
  * @retval None
  */
void UART3_SendData9(uint16_t Data)
{
  /* Clear the transmit data bit 8 */
  UART3->CR1 &= ((uint8_t)~UART3_CR1_T8);                  
  
  /* Write the transmit data bit [8] */
  UART3->CR1 |= (uint8_t)(((uint8_t)(Data >> 2)) & UART3_CR1_T8); 
  
  /* Write the transmit data bit [0:7] */
  UART3->DR   = (uint8_t)(Data);                    
}

/**
  * @brief  Transmits break characters.
  * @param  None
  * @retval None
  */
void UART3_SendBreak(void)
{
  UART3->CR2 |= UART3_CR2_SBK;
}

/**
  * @brief  Sets the address of the UART3 node.
  * @param  UART3_Address: Indicates the address of the UART3 node.
  * @retval None
  */
void UART3_SetAddress(uint8_t UART3_Address)
{
  /* Check the parameters */
  assert_param(IS_UART3_ADDRESS_OK(UART3_Address));
  
  /* Clear the UART3 address */
  UART3->CR4 &= ((uint8_t)~UART3_CR4_ADD);
  /* Set the UART3 address node */
  UART3->CR4 |= UART3_Address;
}

/**
  * @brief  Checks whether the specified UART3 flag is set or not.
  * @param  UART3_FLAG specifies the flag to check.
  *         This parameter can be any of the @ref UART3_Flag_TypeDef enumeration.
  * @retval FlagStatus (SET or RESET)
  */
FlagStatus UART3_GetFlagStatus(UART3_Flag_TypeDef UART3_FLAG)
{
  FlagStatus status = RESET;
  
  /* Check parameters */
  assert_param(IS_UART3_FLAG_OK(UART3_FLAG));
  
  /* Check the status of the specified UART3 flag*/
  if (UART3_FLAG == UART3_FLAG_LBDF)
  {
    if ((UART3->CR4 & (uint8_t)UART3_FLAG) != (uint8_t)0x00)
    {
      /* UART3_FLAG is set*/
      status = SET;
    }
    else
    {
      /* UART3_FLAG is reset*/
      status = RESET;
    }
  }
  else if (UART3_FLAG == UART3_FLAG_SBK)
  {
    if ((UART3->CR2 & (uint8_t)UART3_FLAG) != (uint8_t)0x00)
    {
      /* UART3_FLAG is set*/
      status = SET;
    }
    else
    {
      /* UART3_FLAG is reset*/
      status = RESET;
    }
  }
  else if ((UART3_FLAG == UART3_FLAG_LHDF) || (UART3_FLAG == UART3_FLAG_LSF))
  {
    if ((UART3->CR6 & (uint8_t)UART3_FLAG) != (uint8_t)0x00)
    {
      /* UART3_FLAG is set*/
      status = SET;
    }
    else
    {
      /* UART3_FLAG is reset*/
      status = RESET;
    }
  }
  else
  {
    if ((UART3->SR & (uint8_t)UART3_FLAG) != (uint8_t)0x00)
    {
      /* UART3_FLAG is set*/
      status = SET;
    }
    else
    {
      /* UART3_FLAG is reset*/
      status = RESET;
    }
  }
  
  /* Return the UART3_FLAG status*/
  return  status;
}

/**
  * @brief  Clears the UART3 flags.
  * @param  UART3_FLAG specifies the flag to clear
  *         This parameter can be any combination of the following values:
  *         - UART3_FLAG_LBDF: LIN Break detection flag.
  *         - UART3_FLAG_LHDF: LIN Header detection flag.
  *         - UART3_FLAG_LSF: LIN synchrone field flag.
  *         - UART3_FLAG_RXNE: Receive data register not empty flag.
  * @note
  *         - PE (Parity error), FE (Framing error), NF (Noise error), 
  *           OR (OverRun error) and IDLE (Idle line detected) flags are cleared
  *           by software sequence: a read operation to UART3_SR register 
  *           (UART3_GetFlagStatus())followed by a read operation to UART3_DR 
  *           register(UART3_ReceiveData8() or UART3_ReceiveData9()).
  *             
  *         - RXNE flag can be also cleared by a read to the UART3_DR register
  *           (UART3_ReceiveData8()or UART3_ReceiveData9()).
  *             
  *         - TC flag can be also cleared by software sequence: a read operation
  *           to UART3_SR register (UART3_GetFlagStatus()) followed by a write 
  *           operation to UART3_DR register (UART3_SendData8() or UART3_SendData9()).
  *             
  *         - TXE flag is cleared only by a write to the UART3_DR register 
  *           (UART3_SendData8() or UART3_SendData9()).
  *             
  *         - SBK flag is cleared during the stop bit of break.
  * @retval None
  */
void UART3_ClearFlag(UART3_Flag_TypeDef UART3_FLAG)
{
  /* Check the parameters */
  assert_param(IS_UART3_CLEAR_FLAG_OK(UART3_FLAG));
  
  /*Clear the Receive Register Not Empty flag */
  if (UART3_FLAG == UART3_FLAG_RXNE)
  {
    UART3->SR = (uint8_t)~(UART3_SR_RXNE);
  }
  /*Clear the LIN Break Detection flag */
  else if (UART3_FLAG == UART3_FLAG_LBDF)
  {
    UART3->CR4 &= (uint8_t)(~UART3_CR4_LBDF);
  }
  /*Clear the LIN Header Detection Flag */
  else if (UART3_FLAG == UART3_FLAG_LHDF)
  {
    UART3->CR6 &= (uint8_t)(~UART3_CR6_LHDF);
  }
  /*Clear the LIN Synch Field flag */
  else
  {
    UART3->CR6 &= (uint8_t)(~UART3_CR6_LSF);
  }
}

/**
  * @brief  Checks whether the specified UART3 interrupt has occurred or not.
  * @param  UART3_IT: Specifies the UART3 interrupt pending bit to check.
  *         This parameter can be one of the following values:
  *         - UART3_IT_LBDF:  LIN Break detection interrupt
  *         - UART3_IT_TXE:  Transmit Data Register empty interrupt
  *         - UART3_IT_TC:   Transmission complete interrupt
  *         - UART3_IT_RXNE: Receive Data register not empty interrupt
  *         - UART3_IT_IDLE: Idle line detection interrupt
  *         - UART3_IT_OR:  OverRun Error interrupt
  *         - UART3_IT_PE:   Parity Error interrupt
  * @retval The state of UART3_IT (SET or RESET).
  */
ITStatus UART3_GetITStatus(UART3_IT_TypeDef UART3_IT)
{
  ITStatus pendingbitstatus = RESET;
  uint8_t itpos = 0;
  uint8_t itmask1 = 0;
  uint8_t itmask2 = 0;
  uint8_t enablestatus = 0;
  
  /* Check parameters */
  assert_param(IS_UART3_GET_IT_OK(UART3_IT));
  
  /* Get the UART3 IT index*/
  itpos = (uint8_t)((uint8_t)1 << (uint8_t)((uint8_t)UART3_IT & (uint8_t)0x0F));
  /* Get the UART3 IT index*/
  itmask1 = (uint8_t)((uint8_t)UART3_IT >> (uint8_t)4);
  /* Set the IT mask*/
  itmask2 = (uint8_t)((uint8_t)1 << itmask1);
  
  /* Check the status of the specified UART3 pending bit*/
  if (UART3_IT == UART3_IT_PE)
  {
    /* Get the UART3_ITPENDINGBIT enable bit status*/
    enablestatus = (uint8_t)((uint8_t)UART3->CR1 & itmask2);
    /* Check the status of the specified UART3 interrupt*/
    
    if (((UART3->SR & itpos) != (uint8_t)0x00) && enablestatus)
    {
      /* Interrupt occurred*/
      pendingbitstatus = SET;
    }
    else
    {
      /* Interrupt not occurred*/
      pendingbitstatus = RESET;
    }
  }
  else if (UART3_IT == UART3_IT_LBDF)
  {
    /* Get the UART3_IT enable bit status*/
    enablestatus = (uint8_t)((uint8_t)UART3->CR4 & itmask2);
    /* Check the status of the specified UART3 interrupt*/
    if (((UART3->CR4 & itpos) != (uint8_t)0x00) && enablestatus)
    {
      /* Interrupt occurred*/
      pendingbitstatus = SET;
    }
    else
    {
      /* Interrupt not occurred*/
      pendingbitstatus = RESET;
    }
  }
  else if (UART3_IT == UART3_IT_LHDF)
  {
    /* Get the UART3_IT enable bit status*/
    enablestatus = (uint8_t)((uint8_t)UART3->CR6 & itmask2);
    /* Check the status of the specified UART3 interrupt*/
    if (((UART3->CR6 & itpos) != (uint8_t)0x00) && enablestatus)
    {
      /* Interrupt occurred*/
      pendingbitstatus = SET;
    }
    else
    {
      /* Interrupt not occurred*/
      pendingbitstatus = RESET;
    }
  }
  else
  {
    /* Get the UART3_IT enable bit status*/
    enablestatus = (uint8_t)((uint8_t)UART3->CR2 & itmask2);
    /* Check the status of the specified UART3 interrupt*/
    if (((UART3->SR & itpos) != (uint8_t)0x00) && enablestatus)
    {
      /* Interrupt occurred*/
      pendingbitstatus = SET;
    }
    else
    {
      /* Interrupt not occurred*/
      pendingbitstatus = RESET;
    }
  }
  /* Return the UART3_IT status*/
  return  pendingbitstatus;
}

/**
  * @brief  Clears the UART3 pending flags.
  * @param  UART3_IT specifies the pending bit to clear
  *         This parameter can be one of the following values:
  *         - UART3_IT_LBDF:  LIN Break detection interrupt
  *         - UART3_IT_LHDF:  LIN Header detection interrupt
  *         - UART3_IT_RXNE: Receive Data register not empty interrupt.
  *
  * @note
  *         - PE (Parity error), FE (Framing error), NF (Noise error), 
  *           OR (OverRun error) and IDLE (Idle line detected) pending bits are 
  *           cleared by software sequence: a read operation to UART3_SR register
  *           (UART3_GetITStatus()) followed by a read operation to UART3_DR register 
  *           (UART3_ReceiveData8() or UART3_ReceiveData9()).
  *             
  *         - RXNE pending bit can be also cleared by a read to the UART3_DR register
  *           (UART3_ReceiveData8() or UART3_ReceiveData9() ).
  *             
  *         - TC (Transmit complete) pending bit can be cleared by software 
  *           sequence: a read operation to UART3_SR register (UART3_GetITStatus())
  *           followed by a write operation to UART3_DR register 
  *           (UART3_SendData8()or UART3_SendData9()).
  *             
  *         - TXE pending bit is cleared only by a write to the UART3_DR register
  *           (UART3_SendData8() or UART3_SendData9()).
  * @retval None
  */
void UART3_ClearITPendingBit(UART3_IT_TypeDef UART3_IT)
{
  /* Check the parameters */
  assert_param(IS_UART3_CLEAR_IT_OK(UART3_IT));
  
  /*Clear the Receive Register Not Empty pending bit */
  if (UART3_IT == UART3_IT_RXNE)
  {
    UART3->SR = (uint8_t)~(UART3_SR_RXNE);
  }
  /*Clear the LIN Break Detection pending bit */
  else if (UART3_IT == UART3_IT_LBDF)
  {
    UART3->CR4 &= (uint8_t)~(UART3_CR4_LBDF);
  }
  /*Clear the LIN Header Detection pending bit */
  else
  {
    UART3->CR6 &= (uint8_t)(~UART3_CR6_LHDF);
  }
}

/**
  * @}
  */
  
/**
  * @}
  */
  

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