stm32f10x_usart.c

STM32下做的usb转RS232程序

    
  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;
  }
}

/*******************************************************************************
* Function Name  : USART_SmartCardNACKCmd
* Description    : Enables or disables NACK transmission.
* Input          : - USARTx: where x can be 1, 2 or 3 to select the USART
*                    peripheral.
*                  - NewState: new state of the NACK transmission.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
  /* Check the parameters */
  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;
  }

}

/*******************************************************************************
* Function Name  : USART_HalfDuplexCmd
* Description    : Enables or disables the USART抯 Half Duplex communication.
* Input          : - USARTx: where x can be 1, 2 or 3 to select the USART
*                    peripheral.
*                  - NewState: new state of the USART Communication.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
  /* Check the parameters */
  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;
  }
}

/*******************************************************************************
* Function Name  : USART_IrDAConfig
* Description    : Configures the USART抯 IrDA interface.
* Input          : - USARTx: where x can be 1, 2 or 3 to select the USART
*                    peripheral.
*                  - USART_IrDAMode: specifies the IrDA mode.
*                    This parameter can be one of the following values:
*                       - USART_IrDAMode_LowPower
*                       - USART_IrDAMode_Normal
* Output         : None
* Return         : None
*******************************************************************************/
void USART_IrDAConfig(USART_TypeDef* USARTx, u16 USART_IrDAMode)
{
  /* Check the parameters */
  assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));
    
  USARTx->CR3 &= CR3_IRLP_Mask;
  USARTx->CR3 |= USART_IrDAMode;
}

/*******************************************************************************
* Function Name  : USART_IrDACmd
* Description    : Enables or disables the USART抯 IrDA interface.
* Input          : - USARTx: where x can be 1, 2 or 3 to select the USART
*                    peripheral.
*                  - NewState: new state of the IrDA mode.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
  /* Check the parameters */
  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;
  }
}

/*******************************************************************************
* Function Name  : USART_GetFlagStatus
* Description    : Checks whether the specified USART flag is set or not.
* Input          : - USARTx: where x can be 1, 2 or 3 to select the USART
*                    peripheral.
*                  - USART_FLAG: specifies the flag to check.
*                    This parameter can be one of the following values:
*                       - USART_FLAG_CTS
*                       - USART_FLAG_LBD
*                       - USART_FLAG_TXE
*                       - USART_FLAG_TC
*                       - USART_FLAG_RXNE
*                       - USART_FLAG_IDLE
*                       - USART_FLAG_ORE
*                       - USART_FLAG_NE
*                       - USART_FLAG_FE
*                       - USART_FLAG_PE
* Output         : None
* Return         : The new state of USART_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, u16 USART_FLAG)
{
  FlagStatus bitstatus = RESET;
  
  /* Check the parameters */
  assert_param(IS_USART_FLAG(USART_FLAG));
  
  if ((USARTx->SR & USART_FLAG) != (u16)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/*******************************************************************************
* Function Name  : USART_ClearFlag
* Description    : Clears the USARTx's pending flags.
* Input          : - USARTx: where x can be 1, 2 or 3 to select the USART
*                    peripheral.
*                  - USART_FLAG: specifies the flag to clear.
*                    This parameter can be any combination of the following values:
*                       - USART_FLAG_CTS
*                       - USART_FLAG_LBD
*                       - USART_FLAG_TXE
*                       - USART_FLAG_TC
*                       - USART_FLAG_RXNE
*                       - USART_FLAG_IDLE
*                       - USART_FLAG_ORE
*                       - USART_FLAG_NE
*                       - USART_FLAG_FE
*                       - USART_FLAG_PE
* Output         : None
* Return         : None
*******************************************************************************/
void USART_ClearFlag(USART_TypeDef* USARTx, u16 USART_FLAG)
{
  /* Check the parameters */
  assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));
   
  USARTx->SR &= (u16)~USART_FLAG;
}

/*******************************************************************************
* Function Name  : USART_GetITStatus
* Description    : Checks whether the specified USART interrupt has occurred or not.
* Input          : - USARTx: where x can be 1, 2 or 3 to select the USART
*                    peripheral.
*                  - USART_IT: specifies the USART interrupt source to check.
*                    This parameter can be one of the following values:
*                       - USART_IT_PE
*                       - USART_IT_TXE
*                       - USART_IT_TC
*                       - USART_IT_RXNE
*                       - USART_IT_IDLE
*                       - USART_IT_LBD
*                       - USART_IT_CTS
*                       - USART_IT_ORE
*                       - USART_IT_NE
*                       - USART_IT_FE
* Output         : None
* Return         : The new state of USART_IT (SET or RESET).
*******************************************************************************/
ITStatus USART_GetITStatus(USART_TypeDef* USARTx, u16 USART_IT)
{
  u32 bitpos = 0x00, itmask = 0x00, usartreg = 0;
  ITStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_USART_IT(USART_IT));
  
  /* Get the USART register index */
  usartreg = (((u8)USART_IT) >> 0x05);

  /* Get the interrupt position */
  itmask = USART_IT & USART_IT_Mask;

  itmask = (u32)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 = (u32)0x01 << bitpos;
  bitpos &= USARTx->SR;

  if ((itmask != (u16)RESET)&&(bitpos != (u16)RESET))
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/*******************************************************************************
* Function Name  : USART_ClearITPendingBit
* Description    : Clears the USARTx抯 interrupt pending bits.
* Input          : - USARTx: where x can be 1, 2 or 3 to select the USART
*                    peripheral.
*                  - USART_IT: specifies the interrupt pending bit to clear.
*                    This parameter can be one of the following values:
*                       - USART_IT_PE
*                       - USART_IT_TXE
*                       - USART_IT_TC
*                       - USART_IT_RXNE
*                       - USART_IT_IDLE
*                       - USART_IT_LBD
*                       - USART_IT_CTS
*                       - USART_IT_ORE
*                       - USART_IT_NE
*                       - USART_IT_FE
* Output         : None
* Return         : None
*******************************************************************************/
void USART_ClearITPendingBit(USART_TypeDef* USARTx, u16 USART_IT)
{
  u32 bitpos = 0x00, itmask = 0x00;
  
  /* Check the parameters */
  assert_param(IS_USART_IT(USART_IT));
  
  bitpos = USART_IT >> 0x08;

  itmask = (u32)0x01 << bitpos;
  USARTx->SR &= ~itmask;
}

/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/