Initialization and de-initialization functions

Functions
ErrorStatus	LL_USART_DeInit (USART_TypeDef *USARTx)
	De-initialize USART registers (Registers restored to their default values).
ErrorStatus	LL_USART_Init (USART_TypeDef *USARTx, LL_USART_InitTypeDef *USART_InitStruct)
	Initialize USART registers according to the specified parameters in USART_InitStruct.
void	LL_USART_StructInit (LL_USART_InitTypeDef *USART_InitStruct)
	Set each LL_USART_InitTypeDef field to default value.
ErrorStatus	LL_USART_ClockInit (USART_TypeDef *USARTx, LL_USART_ClockInitTypeDef *USART_ClockInitStruct)
	Initialize USART Clock related settings according to the specified parameters in the USART_ClockInitStruct.
void	LL_USART_ClockStructInit (LL_USART_ClockInitTypeDef *USART_ClockInitStruct)
	Set each field of a LL_USART_ClockInitTypeDef type structure to default value.

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Function Documentation

ErrorStatus LL_USART_ClockInit	(	USART_TypeDef *	USARTx,
		LL_USART_ClockInitTypeDef *	USART_ClockInitStruct
	)

Initialize USART Clock related settings according to the specified parameters in the USART_ClockInitStruct.

Note:

As some bits in USART configuration registers can only be written when the USART is disabled (USART_CR1_UE bit =0), USART IP should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.

Parameters:

USARTx	USART Instance
USART_ClockInitStruct	Pointer to a LL_USART_ClockInitTypeDef structure that contains the Clock configuration information for the specified USART peripheral.

Return values:

An	ErrorStatus enumeration value: SUCCESS: USART registers related to Clock settings are initialized according to USART_ClockInitStruct content ERROR: Problem occurred during USART Registers initialization

Definition at line 413 of file stm32f4xx_ll_usart.c.

References assert_param, LL_USART_ClockInitTypeDef::ClockOutput, LL_USART_ClockInitTypeDef::ClockPhase, LL_USART_ClockInitTypeDef::ClockPolarity, IS_LL_USART_CLOCKOUTPUT, IS_LL_USART_CLOCKPHASE, IS_LL_USART_CLOCKPOLARITY, IS_LL_USART_LASTBITCLKOUTPUT, LL_USART_ClockInitTypeDef::LastBitClockPulse, LL_USART_CLOCK_DISABLE, LL_USART_DisableSCLKOutput(), and LL_USART_IsEnabled().

void LL_USART_ClockStructInit

(

LL_USART_ClockInitTypeDef *

USART_ClockInitStruct

)

Set each field of a LL_USART_ClockInitTypeDef type structure to default value.

Parameters:

USART_ClockInitStruct

Pointer to a LL_USART_ClockInitTypeDef structure whose fields will be set to default values.

Return values:

None

Definition at line 472 of file stm32f4xx_ll_usart.c.

References LL_USART_ClockInitTypeDef::ClockOutput, LL_USART_ClockInitTypeDef::ClockPhase, LL_USART_ClockInitTypeDef::ClockPolarity, LL_USART_ClockInitTypeDef::LastBitClockPulse, LL_USART_CLOCK_DISABLE, LL_USART_LASTCLKPULSE_NO_OUTPUT, LL_USART_PHASE_1EDGE, and LL_USART_POLARITY_LOW.

ErrorStatus LL_USART_DeInit

(

USART_TypeDef *

USARTx

)

De-initialize USART registers (Registers restored to their default values).

Parameters:

USARTx

USART Instance

Return values:

An	ErrorStatus enumeration value: SUCCESS: USART registers are de-initialized ERROR: USART registers are not de-initialized

Definition at line 125 of file stm32f4xx_ll_usart.c.

References assert_param, LL_APB1_GRP1_ForceReset(), LL_APB1_GRP1_PERIPH_UART4, LL_APB1_GRP1_PERIPH_UART5, LL_APB1_GRP1_PERIPH_UART7, LL_APB1_GRP1_PERIPH_UART8, LL_APB1_GRP1_PERIPH_USART2, LL_APB1_GRP1_PERIPH_USART3, LL_APB1_GRP1_ReleaseReset(), LL_APB2_GRP1_ForceReset(), LL_APB2_GRP1_PERIPH_USART1, LL_APB2_GRP1_PERIPH_USART6, and LL_APB2_GRP1_ReleaseReset().

ErrorStatus LL_USART_Init	(	USART_TypeDef *	USARTx,
		LL_USART_InitTypeDef *	USART_InitStruct
	)

Initialize USART registers according to the specified parameters in USART_InitStruct.

Note:

As some bits in USART configuration registers can only be written when the USART is disabled (USART_CR1_UE bit =0), USART IP should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.

Baud rate value stored in USART_InitStruct BaudRate field, should be valid (different from 0).

Parameters:

USARTx	USART Instance
USART_InitStruct	pointer to a LL_USART_InitTypeDef structure that contains the configuration information for the specified USART peripheral.

Return values:

An	ErrorStatus enumeration value: SUCCESS: USART registers are initialized according to USART_InitStruct content ERROR: Problem occurred during USART Registers initialization

Definition at line 249 of file stm32f4xx_ll_usart.c.

References assert_param, LL_USART_InitTypeDef::BaudRate, LL_USART_InitTypeDef::DataWidth, LL_USART_InitTypeDef::HardwareFlowControl, IS_LL_USART_BAUDRATE, IS_LL_USART_BRR_MIN, IS_LL_USART_DATAWIDTH, IS_LL_USART_DIRECTION, IS_LL_USART_HWCONTROL, IS_LL_USART_OVERSAMPLING, IS_LL_USART_PARITY, IS_LL_USART_STOPBITS, LL_RCC_GetSystemClocksFreq(), LL_RCC_PERIPH_FREQUENCY_NO, LL_USART_IsEnabled(), LL_USART_SetBaudRate(), LL_USART_SetHWFlowCtrl(), LL_USART_SetStopBitsLength(), LL_USART_InitTypeDef::OverSampling, LL_USART_InitTypeDef::Parity, LL_RCC_ClocksTypeDef::PCLK1_Frequency, LL_RCC_ClocksTypeDef::PCLK2_Frequency, LL_USART_InitTypeDef::StopBits, and LL_USART_InitTypeDef::TransferDirection.

void LL_USART_StructInit

(

LL_USART_InitTypeDef *

USART_InitStruct

)

Set each LL_USART_InitTypeDef field to default value.

Parameters:

USART_InitStruct

Pointer to a LL_USART_InitTypeDef structure whose fields will be set to default values.

Return values:

None

Definition at line 389 of file stm32f4xx_ll_usart.c.

References LL_USART_InitTypeDef::BaudRate, LL_USART_InitTypeDef::DataWidth, LL_USART_InitTypeDef::HardwareFlowControl, LL_USART_DATAWIDTH_8B, LL_USART_DIRECTION_TX_RX, LL_USART_HWCONTROL_NONE, LL_USART_OVERSAMPLING_16, LL_USART_PARITY_NONE, LL_USART_STOPBITS_1, LL_USART_InitTypeDef::OverSampling, LL_USART_InitTypeDef::Parity, LL_USART_InitTypeDef::StopBits, and LL_USART_InitTypeDef::TransferDirection.