stm32f10x_usart.c

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  USARTx->GTPR |= USART_Prescaler;
}

/**
  * @brief  Enables or disables the USART抯 Smart Card mode.
  * @param USARTx: where x can be 1, 2 or 3 to select the USART
  *   peripheral.
  * @param NewState: new state of the Smart Card mode.
  *   This parameter can be: ENABLE or DISABLE.     
  * @note The Smart Card mode is not available for UART4 and UART5. 
  * @retval : None
  */
void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_USART_123_PERIPH(USARTx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable the SC mode by setting the SCEN bit in the CR3 register */
    USARTx->CR3 |= CR3_SCEN_Set;
  }
  else
  {
    /* Disable the SC mode by clearing the SCEN bit in the CR3 register */
    USARTx->CR3 &= CR3_SCEN_Reset;
  }
}

/**
  * @brief  Enables or disables NACK transmission.
  * @param USARTx: where x can be 1, 2 or 3 to select the USART
  *   peripheral. 
  * @param NewState: new state of the NACK transmission.
  *   This parameter can be: ENABLE or DISABLE.  
  * @note The Smart Card mode is not available for UART4 and UART5.
  * @retval : None
  */
void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_USART_123_PERIPH(USARTx));  
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable the NACK transmission by setting the NACK bit in the CR3 register */
    USARTx->CR3 |= CR3_NACK_Set;
  }
  else
  {
    /* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
    USARTx->CR3 &= CR3_NACK_Reset;
  }
}

/**
  * @brief  Enables or disables the USART抯 Half Duplex communication.
  * @param USARTx: Select the USART or the UART peripheral. 
  *   This parameter can be one of the following values:
  *   USART1, USART2, USART3, UART4 or UART5.
  * @param NewState: new state of the USART Communication.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval : None
  */
void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  
  if (NewState != DISABLE)
  {
    /* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */
    USARTx->CR3 |= CR3_HDSEL_Set;
  }
  else
  {
    /* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */
    USARTx->CR3 &= CR3_HDSEL_Reset;
  }
}

/**
  * @brief  Configures the USART抯 IrDA interface.
  * @param USARTx: Select the USART or the UART peripheral. 
  *   This parameter can be one of the following values:
  *   USART1, USART2, USART3, UART4 or UART5.
  * @param USART_IrDAMode: specifies the IrDA mode.
  *   This parameter can be one of the following values:
  * @arg USART_IrDAMode_LowPower
  * @arg USART_IrDAMode_Normal
  * @retval : None
  */
void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));
    
  USARTx->CR3 &= CR3_IRLP_Mask;
  USARTx->CR3 |= USART_IrDAMode;
}

/**
  * @brief  Enables or disables the USART抯 IrDA interface.
  * @param USARTx: Select the USART or the UART peripheral. 
  *   This parameter can be one of the following values:
  *   USART1, USART2, USART3, UART4 or UART5.
  * @param NewState: new state of the IrDA mode.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval : None
  */
void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
    
  if (NewState != DISABLE)
  {
    /* Enable the IrDA mode by setting the IREN bit in the CR3 register */
    USARTx->CR3 |= CR3_IREN_Set;
  }
  else
  {
    /* Disable the IrDA mode by clearing the IREN bit in the CR3 register */
    USARTx->CR3 &= CR3_IREN_Reset;
  }
}

/**
  * @brief  Checks whether the specified USART flag is set or not.
  * @param USARTx: Select the USART or the UART peripheral. 
  *   This parameter can be one of the following values:
  *   USART1, USART2, USART3, UART4 or UART5.
  * @param USART_FLAG: specifies the flag to check.
  *   This parameter can be one of the following values:
  * @arg USART_FLAG_CTS:  CTS Change flag (not available for UART4 and UART5)
  * @arg USART_FLAG_LBD:  LIN Break detection flag
  * @arg USART_FLAG_TXE:  Transmit data register empty flag
  * @arg USART_FLAG_TC:   Transmission Complete flag
  * @arg USART_FLAG_RXNE: Receive data register not empty flag
  * @arg USART_FLAG_IDLE: Idle Line detection flag
  * @arg USART_FLAG_ORE:  OverRun Error flag
  * @arg USART_FLAG_NE:   Noise Error flag
  * @arg USART_FLAG_FE:   Framing Error flag
  * @arg USART_FLAG_PE:   Parity Error flag
  * @retval : The new state of USART_FLAG (SET or RESET).
  */
FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_FLAG(USART_FLAG));
  assert_param(IS_USART_PERIPH_FLAG(USARTx, USART_FLAG)); /* The CTS flag is not available for UART4 and UART5 */   
  if ((USARTx->SR & USART_FLAG) != (uint16_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Clears the USARTx's pending flags.
  * @param USARTx: Select the USART or the UART peripheral. 
  *   This parameter can be one of the following values:
  *   USART1, USART2, USART3, UART4 or UART5.
  * @param USART_FLAG: specifies the flag to clear.
  *   This parameter can be any combination of the following values:
  * @arg USART_FLAG_CTS:  CTS Change flag (not available for UART4 and UART5).
  * @arg USART_FLAG_LBD:  LIN Break detection flag.
  * @arg USART_FLAG_TC:   Transmission Complete flag.
  * @arg USART_FLAG_RXNE: Receive data register not empty flag.
  *   
  * @note
  *   - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun 
  *     error) and IDLE (Idle line detected) flags are cleared by software 
  *     sequence: a read operation to USART_SR register (USART_GetFlagStatus()) 
  *     followed by a read operation to USART_DR register (USART_ReceiveData()).
  *   - RXNE flag can be also cleared by a read to the USART_DR register 
  *     (USART_ReceiveData()).
  *   - TC flag can be also cleared by software sequence: a read operation to 
  *     USART_SR register (USART_GetFlagStatus()) followed by a write operation
  *     to USART_DR register (USART_SendData()).
  *   - TXE flag is cleared only by a write to the USART_DR register 
  *     (USART_SendData()).
  * @retval : None
  */
void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));
  assert_param(IS_USART_PERIPH_FLAG(USARTx, USART_FLAG)); /* The CTS flag is not available for UART4 and UART5 */   
   
  USARTx->SR = (uint16_t)~USART_FLAG;
}

/**
  * @brief  Checks whether the specified USART interrupt has occurred or not.
  * @param USARTx: Select the USART or the UART peripheral. 
  *   This parameter can be one of the following values:
  *   USART1, USART2, USART3, UART4 or UART5.
  * @param USART_IT: specifies the USART interrupt source to check.
  *   This parameter can be one of the following values:
  * @arg USART_IT_CTS:  CTS change interrupt (not available for UART4 and UART5)
  * @arg USART_IT_LBD:  LIN Break detection interrupt
  * @arg USART_IT_TXE:  Tansmit Data Register empty interrupt
  * @arg USART_IT_TC:   Transmission complete interrupt
  * @arg USART_IT_RXNE: Receive Data register not empty interrupt
  * @arg USART_IT_IDLE: Idle line detection interrupt
  * @arg USART_IT_ORE:  OverRun Error interrupt
  * @arg USART_IT_NE:   Noise Error interrupt
  * @arg USART_IT_FE:   Framing Error interrupt
  * @arg USART_IT_PE:   Parity Error interrupt
  * @retval : The new state of USART_IT (SET or RESET).
  */
ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT)
{
  uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00;
  ITStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_GET_IT(USART_IT));
  assert_param(IS_USART_PERIPH_IT(USARTx, USART_IT)); /* The CTS interrupt is not available for UART4 and UART5 */  
  
  /* Get the USART register index */
  usartreg = (((uint8_t)USART_IT) >> 0x05);
  /* Get the interrupt position */
  itmask = USART_IT & IT_Mask;
  itmask = (uint32_t)0x01 << itmask;
  
  if (usartreg == 0x01) /* The IT  is in CR1 register */
  {
    itmask &= USARTx->CR1;
  }
  else if (usartreg == 0x02) /* The IT  is in CR2 register */
  {
    itmask &= USARTx->CR2;
  }
  else /* The IT  is in CR3 register */
  {
    itmask &= USARTx->CR3;
  }
  
  bitpos = USART_IT >> 0x08;
  bitpos = (uint32_t)0x01 << bitpos;
  bitpos &= USARTx->SR;
  if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET))
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  
  return bitstatus;  
}

/**
  * @brief  Clears the USARTx抯 interrupt pending bits.
  * @param USARTx: Select the USART or the UART peripheral. 
  *   This parameter can be one of the following values:
  *   USART1, USART2, USART3, UART4 or UART5.
  * @param USART_IT: specifies the interrupt pending bit to clear.
  *   This parameter can be one of the following values:
  * @arg USART_IT_CTS:  CTS change interrupt (not available for UART4 and UART5)
  * @arg USART_IT_LBD:  LIN Break detection interrupt
  * @arg USART_IT_TC:   Transmission complete interrupt. 
  * @arg USART_IT_RXNE: Receive Data register not empty interrupt.
  *   
  * @note
  *   - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun 
  *     error) and IDLE (Idle line detected) pending bits are cleared by 
  *     software sequence: a read operation to USART_SR register 
  *     (USART_GetITStatus()) followed by a read operation to USART_DR register 
  *     (USART_ReceiveData()).
  *   - RXNE pending bit can be also cleared by a read to the USART_DR register 
  *     (USART_ReceiveData()).
  *   - TC pending bit can be also cleared by software sequence: a read 
  *     operation to USART_SR register (USART_GetITStatus()) followed by a write 
  *     operation to USART_DR register (USART_SendData()).
  *   - TXE pending bit is cleared only by a write to the USART_DR register 
  *     (USART_SendData()).
  * @retval : None
  */
void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT)
{
  uint16_t bitpos = 0x00, itmask = 0x00;
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_CLEAR_IT(USART_IT));
  assert_param(IS_USART_PERIPH_IT(USARTx, USART_IT)); /* The CTS interrupt is not available for UART4 and UART5 */
  
  bitpos = USART_IT >> 0x08;
  itmask = (uint16_t)((uint16_t)0x01 << bitpos);
  USARTx->SR = (uint16_t)~itmask;
}
/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/