Collaboration diagram for USART_Private_Functions:

Functions
void	USART_DeInit (USART_TypeDef *USARTx)
	Deinitializes the USARTx peripheral registers to their default reset values.
void	USART_Init (USART_TypeDef USARTx, USART_InitTypeDef USART_InitStruct)
	Initializes the USARTx peripheral according to the specified parameters in the USART_InitStruct .
void	USART_StructInit (USART_InitTypeDef *USART_InitStruct)
	Fills each USART_InitStruct member with its default value.
void	USART_ClockInit (USART_TypeDef USARTx, USART_ClockInitTypeDef USART_ClockInitStruct)
	Initializes the USARTx peripheral Clock according to the specified parameters in the USART_ClockInitStruct .
void	USART_ClockStructInit (USART_ClockInitTypeDef *USART_ClockInitStruct)
	Fills each USART_ClockInitStruct member with its default value.
void	USART_Cmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the specified USART peripheral.
void	USART_ITConfig (USART_TypeDef *USARTx, uint16_t USART_IT, FunctionalState NewState)
	Enables or disables the specified USART interrupts.
void	USART_DMACmd (USART_TypeDef *USARTx, uint16_t USART_DMAReq, FunctionalState NewState)
	Enables or disables the USART�s DMA interface.
void	USART_SetAddress (USART_TypeDef *USARTx, uint8_t USART_Address)
	Sets the address of the USART node.
void	USART_WakeUpConfig (USART_TypeDef *USARTx, uint16_t USART_WakeUp)
	Selects the USART WakeUp method.
void	USART_ReceiverWakeUpCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Determines if the USART is in mute mode or not.
void	USART_LINBreakDetectLengthConfig (USART_TypeDef *USARTx, uint16_t USART_LINBreakDetectLength)
	Sets the USART LIN Break detection length.
void	USART_LINCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART�s LIN mode.
void	USART_SendData (USART_TypeDef *USARTx, uint16_t Data)
	Transmits single data through the USARTx peripheral.
uint16_t	USART_ReceiveData (USART_TypeDef *USARTx)
	Returns the most recent received data by the USARTx peripheral.
void	USART_SendBreak (USART_TypeDef *USARTx)
	Transmits break characters.
void	USART_SetGuardTime (USART_TypeDef *USARTx, uint8_t USART_GuardTime)
	Sets the specified USART guard time.
void	USART_SetPrescaler (USART_TypeDef *USARTx, uint8_t USART_Prescaler)
	Sets the system clock prescaler.
void	USART_SmartCardCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART�s Smart Card mode.
void	USART_SmartCardNACKCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables NACK transmission.
void	USART_HalfDuplexCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART�s Half Duplex communication.
void	USART_OverSampling8Cmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's 8x oversampling mode.
void	USART_OneBitMethodCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's one bit sampling methode.
void	USART_IrDAConfig (USART_TypeDef *USARTx, uint16_t USART_IrDAMode)
	Configures the USART�s IrDA interface.
void	USART_IrDACmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART�s IrDA interface.
FlagStatus	USART_GetFlagStatus (USART_TypeDef *USARTx, uint16_t USART_FLAG)
	Checks whether the specified USART flag is set or not.
void	USART_ClearFlag (USART_TypeDef *USARTx, uint16_t USART_FLAG)
	Clears the USARTx's pending flags.
ITStatus	USART_GetITStatus (USART_TypeDef *USARTx, uint16_t USART_IT)
	Checks whether the specified USART interrupt has occurred or not.
void	USART_ClearITPendingBit (USART_TypeDef *USARTx, uint16_t USART_IT)
	Clears the USARTx�s interrupt pending bits.

Function Documentation

void USART_DeInit ( USART_TypeDef * USARTx )

Deinitializes the USARTx peripheral registers to their default reset values.

Parameters:

USARTx,: Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.

Return values:

None

References assert_param, DISABLE, ENABLE, IS_USART_ALL_PERIPH, RCC_APB1Periph_UART4, RCC_APB1Periph_UART5, RCC_APB1Periph_USART2, RCC_APB1Periph_USART3, RCC_APB1PeriphResetCmd(), RCC_APB2Periph_USART1, RCC_APB2PeriphResetCmd(), UART4, UART5, USART1, USART2, and USART3.

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void USART_Init	(	USART_TypeDef *	USARTx,
		USART_InitTypeDef *	USART_InitStruct
	)

Initializes the USARTx peripheral according to the specified parameters in the USART_InitStruct .

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
USART_InitStruct,:	pointer to a USART_InitTypeDef structure that contains the configuration information for the specified USART peripheral.

Return values:

None

References assert_param, USART_TypeDef::BRR, USART_TypeDef::CR1, CR1_CLEAR_Mask, CR1_OVER8_Set, USART_TypeDef::CR2, CR2_STOP_CLEAR_Mask, USART_TypeDef::CR3, CR3_CLEAR_Mask, IS_USART_123_PERIPH, IS_USART_ALL_PERIPH, IS_USART_BAUDRATE, IS_USART_HARDWARE_FLOW_CONTROL, IS_USART_MODE, IS_USART_PARITY, IS_USART_STOPBITS, IS_USART_WORD_LENGTH, RCC_ClocksTypeDef::PCLK1_Frequency, RCC_ClocksTypeDef::PCLK2_Frequency, RCC_GetClocksFreq(), USART1_BASE, USART_InitTypeDef::USART_BaudRate, USART_InitTypeDef::USART_HardwareFlowControl, USART_HardwareFlowControl_None, USART_InitTypeDef::USART_Mode, USART_InitTypeDef::USART_Parity, USART_InitTypeDef::USART_StopBits, and USART_InitTypeDef::USART_WordLength.

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void USART_StructInit ( USART_InitTypeDef * USART_InitStruct )

Fills each USART_InitStruct member with its default value.

Parameters:

USART_InitStruct,: pointer to a USART_InitTypeDef structure which will be initialized.

Return values:

None

References USART_InitTypeDef::USART_BaudRate, USART_InitTypeDef::USART_HardwareFlowControl, USART_HardwareFlowControl_None, USART_InitTypeDef::USART_Mode, USART_Mode_Rx, USART_Mode_Tx, USART_InitTypeDef::USART_Parity, USART_Parity_No, USART_InitTypeDef::USART_StopBits, USART_StopBits_1, USART_InitTypeDef::USART_WordLength, and USART_WordLength_8b.

void USART_ClockInit	(	USART_TypeDef *	USARTx,
		USART_ClockInitTypeDef *	USART_ClockInitStruct
	)

Initializes the USARTx peripheral Clock according to the specified parameters in the USART_ClockInitStruct .

Parameters:

USARTx,:	where x can be 1, 2, 3 to select the USART peripheral.
USART_ClockInitStruct,:	pointer to a USART_ClockInitTypeDef structure that contains the configuration information for the specified USART peripheral.

Note:: The Smart Card mode is not available for UART4 and UART5.

Return values:

None

References assert_param, USART_TypeDef::CR2, CR2_CLOCK_CLEAR_Mask, IS_USART_123_PERIPH, IS_USART_CLOCK, IS_USART_CPHA, IS_USART_CPOL, IS_USART_LASTBIT, USART_ClockInitTypeDef::USART_Clock, USART_ClockInitTypeDef::USART_CPHA, USART_ClockInitTypeDef::USART_CPOL, and USART_ClockInitTypeDef::USART_LastBit.

void USART_ClockStructInit ( USART_ClockInitTypeDef * USART_ClockInitStruct )

Fills each USART_ClockInitStruct member with its default value.

Parameters:

USART_ClockInitStruct,: pointer to a USART_ClockInitTypeDef structure which will be initialized.

Return values:

None

References USART_ClockInitTypeDef::USART_Clock, USART_Clock_Disable, USART_ClockInitTypeDef::USART_CPHA, USART_CPHA_1Edge, USART_ClockInitTypeDef::USART_CPOL, USART_CPOL_Low, USART_ClockInitTypeDef::USART_LastBit, and USART_LastBit_Disable.

void USART_Cmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the specified USART peripheral.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
NewState,:	new state of the USARTx peripheral. This parameter can be: ENABLE or DISABLE.

Return values:

None

References assert_param, USART_TypeDef::CR1, CR1_UE_Reset, CR1_UE_Set, DISABLE, IS_FUNCTIONAL_STATE, and IS_USART_ALL_PERIPH.

void USART_ITConfig	(	USART_TypeDef *	USARTx,
		uint16_t	USART_IT,
		FunctionalState	NewState
	)

Enables or disables the specified USART interrupts.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
USART_IT,:	specifies the USART interrupt sources to be enabled or disabled. This parameter can be one of the following values: USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5) USART_IT_LBD: LIN Break detection interrupt USART_IT_TXE: Tansmit Data Register empty interrupt USART_IT_TC: Transmission complete interrupt USART_IT_RXNE: Receive Data register not empty interrupt USART_IT_IDLE: Idle line detection interrupt USART_IT_PE: Parity Error interrupt USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error)
NewState,:	new state of the specified USARTx interrupts. This parameter can be: ENABLE or DISABLE.

Return values:

None

References __IO, assert_param, DISABLE, IS_FUNCTIONAL_STATE, IS_USART_123_PERIPH, IS_USART_ALL_PERIPH, IS_USART_CONFIG_IT, IT_Mask, and USART_IT_CTS.

void USART_DMACmd	(	USART_TypeDef *	USARTx,
		uint16_t	USART_DMAReq,
		FunctionalState	NewState
	)

Enables or disables the USART�s DMA interface.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3 or UART4.
USART_DMAReq,:	specifies the DMA request. This parameter can be any combination of the following values: USART_DMAReq_Tx: USART DMA transmit request USART_DMAReq_Rx: USART DMA receive request
NewState,:	new state of the DMA Request sources. This parameter can be: ENABLE or DISABLE.

Note:: The DMA mode is not available for UART5.

Return values:

None

References assert_param, USART_TypeDef::CR3, DISABLE, IS_FUNCTIONAL_STATE, IS_USART_1234_PERIPH, and IS_USART_DMAREQ.

void USART_SetAddress	(	USART_TypeDef *	USARTx,
		uint8_t	USART_Address
	)

Sets the address of the USART node.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
USART_Address,:	Indicates the address of the USART node.

Return values:

None

References assert_param, USART_TypeDef::CR2, CR2_Address_Mask, IS_USART_ADDRESS, and IS_USART_ALL_PERIPH.

void USART_WakeUpConfig	(	USART_TypeDef *	USARTx,
		uint16_t	USART_WakeUp
	)

Selects the USART WakeUp method.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
USART_WakeUp,:	specifies the USART wakeup method. This parameter can be one of the following values: USART_WakeUp_IdleLine: WakeUp by an idle line detection USART_WakeUp_AddressMark: WakeUp by an address mark

Return values:

None

References assert_param, USART_TypeDef::CR1, CR1_WAKE_Mask, IS_USART_ALL_PERIPH, and IS_USART_WAKEUP.

void USART_ReceiverWakeUpCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Determines if the USART is in mute mode or not.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
NewState,:	new state of the USART mute mode. This parameter can be: ENABLE or DISABLE.

Return values:

None

References assert_param, USART_TypeDef::CR1, CR1_RWU_Reset, CR1_RWU_Set, DISABLE, IS_FUNCTIONAL_STATE, and IS_USART_ALL_PERIPH.

void USART_LINBreakDetectLengthConfig	(	USART_TypeDef *	USARTx,
		uint16_t	USART_LINBreakDetectLength
	)

Sets the USART LIN Break detection length.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
USART_LINBreakDetectLength,:	specifies the LIN break detection length. This parameter can be one of the following values: USART_LINBreakDetectLength_10b: 10-bit break detection USART_LINBreakDetectLength_11b: 11-bit break detection

Return values:

None

References assert_param, USART_TypeDef::CR2, CR2_LBDL_Mask, IS_USART_ALL_PERIPH, and IS_USART_LIN_BREAK_DETECT_LENGTH.

void USART_LINCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART�s LIN mode.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
NewState,:	new state of the USART LIN mode. This parameter can be: ENABLE or DISABLE.

Return values:

None

References assert_param, USART_TypeDef::CR2, CR2_LINEN_Reset, CR2_LINEN_Set, DISABLE, IS_FUNCTIONAL_STATE, and IS_USART_ALL_PERIPH.

void USART_SendData	(	USART_TypeDef *	USARTx,
		uint16_t	Data
	)

Transmits single data through the USARTx peripheral.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
Data,:	the data to transmit.

Return values:

None

References assert_param, USART_TypeDef::DR, IS_USART_ALL_PERIPH, and IS_USART_DATA.

uint16_t USART_ReceiveData ( USART_TypeDef * USARTx )

Returns the most recent received data by the USARTx peripheral.

Parameters:

USARTx,: Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.

Return values:

The	received data.

References assert_param, USART_TypeDef::DR, and IS_USART_ALL_PERIPH.

void USART_SendBreak ( USART_TypeDef * USARTx )

Transmits break characters.

Parameters:

USARTx,: Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.

Return values:

None

References assert_param, USART_TypeDef::CR1, CR1_SBK_Set, and IS_USART_ALL_PERIPH.

void USART_SetGuardTime	(	USART_TypeDef *	USARTx,
		uint8_t	USART_GuardTime
	)

Sets the specified USART guard time.

Parameters:

USARTx,:	where x can be 1, 2 or 3 to select the USART peripheral.
USART_GuardTime,:	specifies the guard time.

Note:: The guard time bits are not available for UART4 and UART5.

Return values:

None

References assert_param, USART_TypeDef::GTPR, GTPR_LSB_Mask, and IS_USART_123_PERIPH.

void USART_SetPrescaler	(	USART_TypeDef *	USARTx,
		uint8_t	USART_Prescaler
	)

Sets the system clock prescaler.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
USART_Prescaler,:	specifies the prescaler clock.

Note:: The function is used for IrDA mode with UART4 and UART5.

Return values:

None

References assert_param, USART_TypeDef::GTPR, GTPR_MSB_Mask, and IS_USART_ALL_PERIPH.

void USART_SmartCardCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART�s Smart Card mode.

Parameters:

USARTx,:	where x can be 1, 2 or 3 to select the USART peripheral.
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.

Return values:

None

References assert_param, USART_TypeDef::CR3, CR3_SCEN_Reset, CR3_SCEN_Set, DISABLE, IS_FUNCTIONAL_STATE, and IS_USART_123_PERIPH.

void USART_SmartCardNACKCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables NACK transmission.

Parameters:

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.

Note:: The Smart Card mode is not available for UART4 and UART5.

Return values:

None

References assert_param, USART_TypeDef::CR3, CR3_NACK_Reset, CR3_NACK_Set, DISABLE, IS_FUNCTIONAL_STATE, and IS_USART_123_PERIPH.

void USART_HalfDuplexCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART�s Half Duplex communication.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
NewState,:	new state of the USART Communication. This parameter can be: ENABLE or DISABLE.

Return values:

None

References assert_param, USART_TypeDef::CR3, CR3_HDSEL_Reset, CR3_HDSEL_Set, DISABLE, IS_FUNCTIONAL_STATE, and IS_USART_ALL_PERIPH.

void USART_OverSampling8Cmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART's 8x oversampling mode.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
NewState,:	new state of the USART one bit sampling methode. This parameter can be: ENABLE or DISABLE.

Note:: This function has to be called before calling USART_Init() function in order to have correct baudrate Divider value.

Return values:

None

References assert_param, USART_TypeDef::CR1, CR1_OVER8_Reset, CR1_OVER8_Set, DISABLE, IS_FUNCTIONAL_STATE, and IS_USART_ALL_PERIPH.

void USART_OneBitMethodCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART's one bit sampling methode.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
NewState,:	new state of the USART one bit sampling methode. This parameter can be: ENABLE or DISABLE.

Return values:

None

References assert_param, USART_TypeDef::CR3, CR3_ONEBITE_Reset, CR3_ONEBITE_Set, DISABLE, IS_FUNCTIONAL_STATE, and IS_USART_ALL_PERIPH.

void USART_IrDAConfig	(	USART_TypeDef *	USARTx,
		uint16_t	USART_IrDAMode
	)

Configures the USART�s IrDA interface.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
USART_IrDAMode,:	specifies the IrDA mode. This parameter can be one of the following values: USART_IrDAMode_LowPower USART_IrDAMode_Normal

Return values:

None

References assert_param, USART_TypeDef::CR3, CR3_IRLP_Mask, IS_USART_ALL_PERIPH, and IS_USART_IRDA_MODE.

void USART_IrDACmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART�s IrDA interface.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
NewState,:	new state of the IrDA mode. This parameter can be: ENABLE or DISABLE.

Return values:

None

References assert_param, USART_TypeDef::CR3, CR3_IREN_Reset, CR3_IREN_Set, DISABLE, IS_FUNCTIONAL_STATE, and IS_USART_ALL_PERIPH.

FlagStatus USART_GetFlagStatus	(	USART_TypeDef *	USARTx,
		uint16_t	USART_FLAG
	)

Checks whether the specified USART flag is set or not.

Parameters:

USARTx,: Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.

USART_FLAG,:

specifies the flag to check. This parameter can be one of the following values:

USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5)
USART_FLAG_LBD: LIN Break detection flag
USART_FLAG_TXE: Transmit data register empty flag
USART_FLAG_TC: Transmission Complete flag
USART_FLAG_RXNE: Receive data register not empty flag
USART_FLAG_IDLE: Idle Line detection flag
USART_FLAG_ORE: OverRun Error flag
USART_FLAG_NE: Noise Error flag
USART_FLAG_FE: Framing Error flag
USART_FLAG_PE: Parity Error flag

Return values:

The	new state of USART_FLAG (SET or RESET).

References assert_param, IS_USART_123_PERIPH, IS_USART_ALL_PERIPH, IS_USART_FLAG, RESET, SET, USART_TypeDef::SR, and USART_FLAG_CTS.

void USART_ClearFlag	(	USART_TypeDef *	USARTx,
		uint16_t	USART_FLAG
	)

Clears the USARTx's pending flags.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
USART_FLAG,:	specifies the flag to clear. This parameter can be any combination of the following values: USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5). USART_FLAG_LBD: LIN Break detection flag. USART_FLAG_TC: Transmission Complete flag. 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()).

Return values:

None

References assert_param, IS_USART_123_PERIPH, IS_USART_ALL_PERIPH, IS_USART_CLEAR_FLAG, USART_TypeDef::SR, and USART_FLAG_CTS.

ITStatus USART_GetITStatus	(	USART_TypeDef *	USARTx,
		uint16_t	USART_IT
	)

Checks whether the specified USART interrupt has occurred or not.

Parameters:

USARTx,: Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.

USART_IT,:

specifies the USART interrupt source to check. This parameter can be one of the following values:

USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5)
USART_IT_LBD: LIN Break detection interrupt
USART_IT_TXE: Tansmit Data Register empty interrupt
USART_IT_TC: Transmission complete interrupt
USART_IT_RXNE: Receive Data register not empty interrupt
USART_IT_IDLE: Idle line detection interrupt
USART_IT_ORE: OverRun Error interrupt
USART_IT_NE: Noise Error interrupt
USART_IT_FE: Framing Error interrupt
USART_IT_PE: Parity Error interrupt

Return values:

The	new state of USART_IT (SET or RESET).

References assert_param, USART_TypeDef::CR1, USART_TypeDef::CR2, USART_TypeDef::CR3, IS_USART_123_PERIPH, IS_USART_ALL_PERIPH, IS_USART_GET_IT, IT_Mask, RESET, SET, USART_TypeDef::SR, and USART_IT_CTS.

void USART_ClearITPendingBit	(	USART_TypeDef *	USARTx,
		uint16_t	USART_IT
	)

Clears the USARTx�s interrupt pending bits.

Parameters:

USARTx,:	Select the USART or the UART peripheral. This parameter can be one of the following values: USART1, USART2, USART3, UART4 or UART5.
USART_IT,:	specifies the interrupt pending bit to clear. This parameter can be one of the following values: USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5) USART_IT_LBD: LIN Break detection interrupt USART_IT_TC: Transmission complete interrupt. 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()).

Return values:

None

References assert_param, IS_USART_123_PERIPH, IS_USART_ALL_PERIPH, IS_USART_CLEAR_IT, USART_TypeDef::SR, and USART_IT_CTS.