USART

USART driver modules. More...

Modules
	USART_Exported_Constants
	USART_Private_Functions

Data Structures
struct	USART_InitTypeDef
	USART Init Structure definition. More...
struct	USART_ClockInitTypeDef
	USART Clock Init Structure definition. More...

Macros
#define	CR1_CLEAR_MASK
#define	CR2_CLOCK_CLEAR_MASK
#define	CR3_CLEAR_MASK   ((uint32_t)(USART_CR3_RTSE | USART_CR3_CTSE))
#define	IT_MASK   ((uint32_t)0x000000FF)

Functions
void	USART_DeInit (USART_TypeDef *USARTx)
	Deinitializes the USARTx peripheral registers to their default reset values. More...
void	USART_Init (USART_TypeDef *USARTx, USART_InitTypeDef *USART_InitStruct)
	Initializes the USARTx peripheral according to the specified parameters in the USART_InitStruct . More...
void	USART_StructInit (USART_InitTypeDef *USART_InitStruct)
	Fills each USART_InitStruct member with its default value. More...
void	USART_ClockInit (USART_TypeDef *USARTx, USART_ClockInitTypeDef *USART_ClockInitStruct)
	Initializes the USARTx peripheral Clock according to the specified parameters in the USART_ClockInitStruct. More...
void	USART_ClockStructInit (USART_ClockInitTypeDef *USART_ClockInitStruct)
	Fills each USART_ClockInitStruct member with its default value. More...
void	USART_Cmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the specified USART peripheral. More...
void	USART_DirectionModeCmd (USART_TypeDef *USARTx, uint32_t USART_DirectionMode, FunctionalState NewState)
	Enables or disables the USART's transmitter or receiver. More...
void	USART_SetPrescaler (USART_TypeDef *USARTx, uint8_t USART_Prescaler)
	Sets the system clock prescaler. More...
void	USART_OverSampling8Cmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's 8x oversampling mode. More...
void	USART_OneBitMethodCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's one bit sampling method. More...
void	USART_MSBFirstCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's most significant bit first transmitted/received following the start bit. More...
void	USART_DataInvCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the binary data inversion. More...
void	USART_InvPinCmd (USART_TypeDef *USARTx, uint32_t USART_InvPin, FunctionalState NewState)
	Enables or disables the Pin(s) active level inversion. More...
void	USART_SWAPPinCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the swap Tx/Rx pins. More...
void	USART_ReceiverTimeOutCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the receiver Time Out feature. More...
void	USART_SetReceiverTimeOut (USART_TypeDef *USARTx, uint32_t USART_ReceiverTimeOut)
	Sets the receiver Time Out value. More...
void	USART_STOPModeCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the specified USART peripheral in STOP Mode. More...
void	USART_StopModeWakeUpSourceConfig (USART_TypeDef *USARTx, uint32_t USART_WakeUpSource)
	Selects the USART WakeUp method form stop mode. More...
void	USART_AutoBaudRateCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the Auto Baud Rate. More...
void	USART_AutoBaudRateConfig (USART_TypeDef *USARTx, uint32_t USART_AutoBaudRate)
	Selects the USART auto baud rate method. More...
void	USART_SendData (USART_TypeDef *USARTx, uint16_t Data)
	Transmits single data through the USARTx peripheral. More...
uint16_t	USART_ReceiveData (USART_TypeDef *USARTx)
	Returns the most recent received data by the USARTx peripheral. More...
void	USART_SetAddress (USART_TypeDef *USARTx, uint8_t USART_Address)
	Sets the address of the USART node. More...
void	USART_MuteModeWakeUpConfig (USART_TypeDef *USARTx, uint32_t USART_WakeUp)
	Selects the USART WakeUp method from mute mode. More...
void	USART_MuteModeCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's mute mode. More...
void	USART_AddressDetectionConfig (USART_TypeDef *USARTx, uint32_t USART_AddressLength)
	Configure the the USART Address detection length. More...
void	USART_LINBreakDetectLengthConfig (USART_TypeDef *USARTx, uint32_t USART_LINBreakDetectLength)
	Sets the USART LIN Break detection length. More...
void	USART_LINCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's LIN mode. More...
void	USART_HalfDuplexCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's Half Duplex communication. More...
void	USART_SmartCardCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's Smart Card mode. More...
void	USART_SmartCardNACKCmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables NACK transmission. More...
void	USART_SetGuardTime (USART_TypeDef *USARTx, uint8_t USART_GuardTime)
	Sets the specified USART guard time. More...
void	USART_SetAutoRetryCount (USART_TypeDef *USARTx, uint8_t USART_AutoCount)
	Sets the Smart Card number of retries in transmit and receive. More...
void	USART_SetBlockLength (USART_TypeDef *USARTx, uint8_t USART_BlockLength)
	Sets the Smart Card Block length. More...
void	USART_IrDAConfig (USART_TypeDef *USARTx, uint32_t USART_IrDAMode)
	Configures the USART's IrDA interface. More...
void	USART_IrDACmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's IrDA interface. More...
void	USART_DECmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's DE functionality. More...
void	USART_DEPolarityConfig (USART_TypeDef *USARTx, uint32_t USART_DEPolarity)
	Configures the USART's DE polarity. More...
void	USART_SetDEAssertionTime (USART_TypeDef *USARTx, uint32_t USART_DEAssertionTime)
	Sets the specified RS485 DE assertion time. More...
void	USART_SetDEDeassertionTime (USART_TypeDef *USARTx, uint32_t USART_DEDeassertionTime)
	Sets the specified RS485 DE deassertion time. More...
void	USART_DMACmd (USART_TypeDef *USARTx, uint32_t USART_DMAReq, FunctionalState NewState)
	Enables or disables the USART's DMA interface. More...
void	USART_DMAReceptionErrorConfig (USART_TypeDef *USARTx, uint32_t USART_DMAOnError)
	Enables or disables the USART's DMA interface when reception error occurs. More...
void	USART_ITConfig (USART_TypeDef *USARTx, uint32_t USART_IT, FunctionalState NewState)
	Enables or disables the specified USART interrupts. More...
void	USART_RequestCmd (USART_TypeDef *USARTx, uint32_t USART_Request, FunctionalState NewState)
	Enables the specified USART's Request. More...
void	USART_OverrunDetectionConfig (USART_TypeDef *USARTx, uint32_t USART_OVRDetection)
	Enables or disables the USART's Overrun detection. More...
FlagStatus	USART_GetFlagStatus (USART_TypeDef *USARTx, uint32_t USART_FLAG)
	Checks whether the specified USART flag is set or not. More...
void	USART_ClearFlag (USART_TypeDef *USARTx, uint32_t USART_FLAG)
	Clears the USARTx's pending flags. More...
ITStatus	USART_GetITStatus (USART_TypeDef *USARTx, uint32_t USART_IT)
	Checks whether the specified USART interrupt has occurred or not. More...
void	USART_ClearITPendingBit (USART_TypeDef *USARTx, uint32_t USART_IT)
	Clears the USARTx's interrupt pending bits. More...

Detailed Description

USART driver modules.

Macro Definition Documentation

#define CR1_CLEAR_MASK

Value:

((uint32_t)(USART_CR1_M | USART_CR1_PCE | \
                                              USART_CR1_PS | USART_CR1_TE | \
                                              USART_CR1_RE))

< USART CR1 register clear Mask ((~(uint32_t)0xFFFFE6F3)) USART CR2 register clock bits clear Mask ((~(uint32_t)0xFFFFF0FF))

#define CR2_CLOCK_CLEAR_MASK

Value:

((uint32_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \
                                              USART_CR2_CPHA | USART_CR2_LBCL))

USART CR3 register clear Mask ((~(uint32_t)0xFFFFFCFF))

#define CR3_CLEAR_MASK   ((uint32_t)(USART_CR3_RTSE | USART_CR3_CTSE))

USART Interrupts mask

Function Documentation

void USART_AddressDetectionConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_AddressLength
	)

Configure the the USART Address detection length.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_AddressLength,:	specifies the USART address length detection. This parameter can be one of the following values: USART_AddressLength_4b: 4-bit address length detection USART_AddressLength_7b: 7-bit address length detection

Return values

None

void USART_AutoBaudRateCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the Auto Baud Rate.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USARTx auto baud rate. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_AutoBaudRateConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_AutoBaudRate
	)

Selects the USART auto baud rate method.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_AutoBaudRate,:	specifies the selected USART auto baud rate method. This parameter can be one of the following values: USART_AutoBaudRate_StartBit: Start Bit duration measurement. USART_AutoBaudRate_FallingEdge: Falling edge to falling edge measurement.

Note

This function has to be called before calling USART_Cmd() function.

Return values

None

void USART_ClearFlag	(	USART_TypeDef *	USARTx,
		uint32_t	USART_FLAG
	)

Clears the USARTx's pending flags.

Parameters

USARTx,:

where x can be 1 or 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_WU: Wake up flag. USART_FLAG_CM: Character match flag. USART_FLAG_EOB: End of block flag. USART_FLAG_RTO: Receive time out flag. USART_FLAG_CTS: CTS Change flag. USART_FLAG_LBD: LIN Break detection flag. USART_FLAG_TC: Transmission Complete flag. USART_FLAG_IDLE: IDLE line detected flag. USART_FLAG_ORE: OverRun Error flag. USART_FLAG_NE: Noise Error flag. USART_FLAG_FE: Framing Error flag. USART_FLAG_PE: Parity Errorflag.

Note

RXNE pending bit is cleared by a read to the USART_RDR register (USART_ReceiveData()) or by writing 1 to the RXFRQ in the register USART_RQR (USART_RequestCmd()).

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_TDR register (USART_SendData()).

TXE flag is cleared by a write to the USART_TDR register (USART_SendData()) or by writing 1 to the TXFRQ in the register USART_RQR (USART_RequestCmd()).

SBKF flag is cleared by 1 to the SBKRQ in the register USART_RQR (USART_RequestCmd()).

Return values

None

void USART_ClearITPendingBit	(	USART_TypeDef *	USARTx,
		uint32_t	USART_IT
	)

Clears the USARTx's interrupt pending bits.

Parameters

USARTx,:

where x can be 1 or 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_WU: Wake up interrupt. USART_IT_CM: Character match interrupt. USART_IT_EOB: End of block interrupt. USART_IT_RTO: Receive time out interrupt. USART_IT_CTS: CTS change interrupt. USART_IT_LBD: LIN Break detection interrupt. USART_IT_TC: Transmission complete interrupt. USART_IT_IDLE: IDLE line detected 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.

Note

RXNE pending bit is cleared by a read to the USART_RDR register (USART_ReceiveData()) or by writing 1 to the RXFRQ in the register USART_RQR (USART_RequestCmd()).

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_TDR register (USART_SendData()).

TXE pending bit is cleared by a write to the USART_TDR register (USART_SendData()) or by writing 1 to the TXFRQ in the register USART_RQR (USART_RequestCmd()).

Return values

None

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 or 2 or 3 to select the USART peripheral.
USART_ClockInitStruct,:	pointer to a USART_ClockInitTypeDef structure that contains the configuration information for the specified USART peripheral.

Return values

None

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

void USART_Cmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the specified USART peripheral.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USARTx peripheral. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_DataInvCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the binary data inversion.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new defined levels for the USART data. This parameter can be: ENABLE: Logical data from the data register are send/received in negative logic (1=L, 0=H). The parity bit is also inverted. DISABLE: Logical data from the data register are send/received in positive logic (1=H, 0=L)

Note

This function has to be called before calling USART_Cmd() function.

Return values

None

void USART_DECmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART's DE functionality.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the driver enable mode. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_DeInit

(

USART_TypeDef *

USARTx

)

Deinitializes the USARTx peripheral registers to their default reset values.

Parameters

USARTx,:

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

Return values

None

void USART_DEPolarityConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_DEPolarity
	)

Configures the USART's DE polarity.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_DEPolarity,:	specifies the DE polarity. This parameter can be one of the following values: USART_DEPolarity_Low USART_DEPolarity_High

Return values

None

void USART_DirectionModeCmd	(	USART_TypeDef *	USARTx,
		uint32_t	USART_DirectionMode,
		FunctionalState	NewState
	)

Enables or disables the USART's transmitter or receiver.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_Direction,:	specifies the USART direction. This parameter can be any combination of the following values: USART_Mode_Tx: USART Transmitter USART_Mode_Rx: USART Receiver
NewState,:	new state of the USART transfer direction. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_DMACmd	(	USART_TypeDef *	USARTx,
		uint32_t	USART_DMAReq,
		FunctionalState	NewState
	)

Enables or disables the USART's DMA interface.

Parameters

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

Return values

None

void USART_DMAReceptionErrorConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_DMAOnError
	)

Enables or disables the USART's DMA interface when reception error occurs.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_DMAOnError,:	specifies the DMA status in case of reception error. This parameter can be any combination of the following values: USART_DMAOnError_Enable: DMA receive request enabled when the USART DMA reception error is asserted. USART_DMAOnError_Disable: DMA receive request disabled when the USART DMA reception error is asserted.

Return values

None

FlagStatus USART_GetFlagStatus	(	USART_TypeDef *	USARTx,
		uint32_t	USART_FLAG
	)

Checks whether the specified USART flag is set or not.

Parameters

USARTx,:

where x can be 1 or 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_REACK: Receive Enable acknowledge flag. USART_FLAG_TEACK: Transmit Enable acknowledge flag. USART_FLAG_WU: Wake up flag. USART_FLAG_RWU: Receive Wake up flag. USART_FLAG_SBK: Send Break flag. USART_FLAG_CM: Character match flag. USART_FLAG_BUSY: Busy flag. USART_FLAG_ABRF: Auto baud rate flag. USART_FLAG_ABRE: Auto baud rate error flag. USART_FLAG_EOB: End of block flag. USART_FLAG_RTO: Receive time out flag. USART_FLAG_nCTSS: Inverted nCTS input bit status. USART_FLAG_CTS: CTS Change flag. 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).

ITStatus USART_GetITStatus	(	USART_TypeDef *	USARTx,
		uint32_t	USART_IT
	)

Checks whether the specified USART interrupt has occurred or not.

Parameters

USARTx,:

where x can be 1 or 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_WU: Wake up interrupt. USART_IT_CM: Character match interrupt. USART_IT_EOB: End of block interrupt. USART_IT_RTO: Receive time out interrupt. USART_IT_CTS: CTS change interrupt. 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).

void USART_HalfDuplexCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART's Half Duplex communication.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USART Communication. This parameter can be: ENABLE or DISABLE.

Return values

None

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

Return values

None

void USART_InvPinCmd	(	USART_TypeDef *	USARTx,
		uint32_t	USART_InvPin,
		FunctionalState	NewState
	)

Enables or disables the Pin(s) active level inversion.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_InvPin,:	specifies the USART pin(s) to invert. This parameter can be any combination of the following values: USART_InvPin_Tx: USART Tx pin active level inversion. USART_InvPin_Rx: USART Rx pin active level inversion.
NewState,:	new active level status for the USART pin(s). This parameter can be: ENABLE: pin(s) signal values are inverted (Vdd =0, Gnd =1). DISABLE: pin(s) signal works using the standard logic levels (Vdd =1, Gnd =0).

Note

This function has to be called before calling USART_Cmd() function.

Return values

None

void USART_IrDACmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART's IrDA interface.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the IrDA mode. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_IrDAConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_IrDAMode
	)

Configures the USART's IrDA interface.

Parameters

USARTx,:	where x can be 1 or 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

Return values

None

void USART_ITConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_IT,
		FunctionalState	NewState
	)

Enables or disables the specified USART interrupts.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_IT,:	specifies the USART interrupt sources to be enabled or disabled. This parameter can be one of the following values: USART_IT_WU: Wake up interrupt. USART_IT_CM: Character match interrupt. USART_IT_EOB: End of block interrupt. USART_IT_RTO: Receive time out interrupt. USART_IT_CTS: CTS change interrupt. 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

void USART_LINBreakDetectLengthConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_LINBreakDetectLength
	)

Sets the USART LIN Break detection length.

Parameters

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

void USART_LINCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART's LIN mode.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USART LIN mode. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_MSBFirstCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART's most significant bit first transmitted/received following the start bit.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USART most significant bit first transmitted/received following the start bit. This parameter can be: ENABLE or DISABLE.

Note

This function has to be called before calling USART_Cmd() function.

Return values

None

void USART_MuteModeCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART's mute mode.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USART mute mode. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_MuteModeWakeUpConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_WakeUp
	)

Selects the USART WakeUp method from mute mode.

Parameters

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

void USART_OneBitMethodCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

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

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USART one bit sampling method. This parameter can be: ENABLE or DISABLE.

Note

This function has to be called before calling USART_Cmd() function.

Return values

None

void USART_OverrunDetectionConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_OVRDetection
	)

Enables or disables the USART's Overrun detection.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_OVRDetection,:	specifies the OVR detection status in case of OVR error. This parameter can be any combination of the following values: USART_OVRDetection_Enable: OVR error detection enabled when the USART OVR error is asserted. USART_OVRDetection_Disable: OVR error detection disabled when the USART OVR error is asserted.

Return values

None

void USART_OverSampling8Cmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

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

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USART 8x oversampling mode. 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

uint16_t USART_ReceiveData

(

USART_TypeDef *

USARTx

)

Returns the most recent received data by the USARTx peripheral.

Parameters

USARTx,:

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

Return values

The	received data.

void USART_ReceiverTimeOutCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the receiver Time Out feature.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USARTx receiver Time Out. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_RequestCmd	(	USART_TypeDef *	USARTx,
		uint32_t	USART_Request,
		FunctionalState	NewState
	)

Enables the specified USART's Request.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_Request,:	specifies the USART request. This parameter can be any combination of the following values: USART_Request_TXFRQ: Transmit data flush ReQuest USART_Request_RXFRQ: Receive data flush ReQuest USART_Request_MMRQ: Mute Mode ReQuest USART_Request_SBKRQ: Send Break ReQuest USART_Request_ABRRQ: Auto Baud Rate ReQuest
NewState,:	new state of the DMA interface when reception error occurs. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_SendData	(	USART_TypeDef *	USARTx,
		uint16_t	Data
	)

Transmits single data through the USARTx peripheral.

Parameters

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

Return values

None

void USART_SetAddress	(	USART_TypeDef *	USARTx,
		uint8_t	USART_Address
	)

Sets the address of the USART node.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_Address,:	Indicates the address of the USART node.

Return values

None

void USART_SetAutoRetryCount	(	USART_TypeDef *	USARTx,
		uint8_t	USART_AutoCount
	)

Sets the Smart Card number of retries in transmit and receive.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_AutoCount,:	specifies the Smart Card auto retry count.

Return values

None

void USART_SetBlockLength	(	USART_TypeDef *	USARTx,
		uint8_t	USART_BlockLength
	)

Sets the Smart Card Block length.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_BlockLength,:	specifies the Smart Card block length.

Return values

None

void USART_SetDEAssertionTime	(	USART_TypeDef *	USARTx,
		uint32_t	USART_DEAssertionTime
	)

Sets the specified RS485 DE assertion time.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_DEAssertionTime,:	specifies the time between the activation of the DE signal and the beginning of the start bit

Return values

None

void USART_SetDEDeassertionTime	(	USART_TypeDef *	USARTx,
		uint32_t	USART_DEDeassertionTime
	)

Sets the specified RS485 DE deassertion time.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_DeassertionTime,:	specifies the time between the middle of the last stop bit in a transmitted message and the de-activation of the DE signal

Return values

None

void USART_SetGuardTime	(	USART_TypeDef *	USARTx,
		uint8_t	USART_GuardTime
	)

Sets the specified USART guard time.

Parameters

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

Return values

None

void USART_SetPrescaler	(	USART_TypeDef *	USARTx,
		uint8_t	USART_Prescaler
	)

Sets the system clock prescaler.

Parameters

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

Note

This function has to be called before calling USART_Cmd() function.

Return values

None

void USART_SetReceiverTimeOut	(	USART_TypeDef *	USARTx,
		uint32_t	USART_ReceiverTimeOut
	)

Sets the receiver Time Out value.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_ReceiverTimeOut,:	specifies the Receiver Time Out value.

Return values

None

void USART_SmartCardCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART's Smart Card mode.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the Smart Card mode. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_SmartCardNACKCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables NACK transmission.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the NACK transmission. This parameter can be: ENABLE or DISABLE.

Return values

None

void USART_STOPModeCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the specified USART peripheral in STOP Mode.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USARTx peripheral state in stop mode. This parameter can be: ENABLE or DISABLE.

Note

This function has to be called when USART clock is set to HSI or LSE.

Return values

None

void USART_StopModeWakeUpSourceConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_WakeUpSource
	)

Selects the USART WakeUp method form stop mode.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
USART_WakeUp,:	specifies the selected USART wakeup method. This parameter can be one of the following values: USART_WakeUpSource_AddressMatch: WUF active on address match. USART_WakeUpSource_StartBit: WUF active on Start bit detection. USART_WakeUpSource_RXNE: WUF active on RXNE.

Note

This function has to be called before calling USART_Cmd() function.

Return values

None

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

void USART_SWAPPinCmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the swap Tx/Rx pins.

Parameters

USARTx,:	where x can be 1 or 2 or 3 to select the USART peripheral.
NewState,:	new state of the USARTx TX/RX pins pinout. This parameter can be: ENABLE: The TX and RX pins functions are swapped. DISABLE: TX/RX pins are used as defined in standard pinout

Note

This function has to be called before calling USART_Cmd() function.

Return values

None