【STM32】USART相关函数和类型


00. 目录

文章目录00. 目录01. USART固件库概述02. USART相关类型03. USART相关其它宏04. USART相关函数05. USART其它06. 附录07. 声明

01. USART固件库概述

stm32f4xx_usart.h 函数的声明和类型的声明

stm32f4xx_usart.c 函数的实现

02. USART相关类型

stm32f4xx_usart.h文件中

USART_InitTypeDef类型


/**
* @brief USART Init Structure definition
*/

typedef struct
{
uint32_t USART_BaudRate; /*!< This member configures the USART communication baud rate.
The baud rate is computed using the following formula:
- IntegerDivider = ((PCLKx) / (8 * (OVR8+1) * (USART_InitStruct->USART_BaudRate)))
- FractionalDivider = ((IntegerDivider - ((u32) IntegerDivider)) * 8 * (OVR8+1)) + 0.5
Where OVR8 is the "oversampling by 8 mode" configuration bit in the CR1 register. */

uint16_t USART_WordLength; /*!< Specifies the number of data bits transmitted or received in a frame.
This parameter can be a value of @ref USART_Word_Length */

uint16_t USART_StopBits; /*!< Specifies the number of stop bits transmitted.
This parameter can be a value of @ref USART_Stop_Bits */

uint16_t USART_Parity; /*!< Specifies the parity mode.
This parameter can be a value of @ref USART_Parity
@note When parity is enabled, the computed parity is inserted
at the MSB position of the transmitted data (9th bit when
the word length is set to 9 data bits; 8th bit when the
word length is set to 8 data bits). */

uint16_t USART_Mode; /*!< Specifies whether the Receive or Transmit mode is enabled or disabled.
This parameter can be a value of @ref USART_Mode */

uint16_t USART_HardwareFlowControl; /*!< Specifies wether the hardware flow control mode is enabled
or disabled.
This parameter can be a value of @ref USART_Hardware_Flow_Control */
} USART_InitTypeDef;

USART_ClockInitTypeDef类型

/**
* @brief USART Clock Init Structure definition
*/

typedef struct
{

uint16_t USART_Clock; /*!< Specifies whether the USART clock is enabled or disabled.
This parameter can be a value of @ref USART_Clock */

uint16_t USART_CPOL; /*!< Specifies the steady state of the serial clock.
This parameter can be a value of @ref USART_Clock_Polarity */

uint16_t USART_CPHA; /*!< Specifies the clock transition on which the bit capture is made.
This parameter can be a value of @ref USART_Clock_Phase */

uint16_t USART_LastBit; /*!< Specifies whether the clock pulse corresponding to the last transmitted
data bit (MSB) has to be output on the SCLK pin in synchronous mode.
This parameter can be a value of @ref USART_Last_Bit */
} USART_ClockInitTypeDef;

USART外设

/** @defgroup USART_Exported_Constants
* @{
*/

#define IS_USART_ALL_PERIPH(PERIPH) (((PERIPH) == USART1) || \
((PERIPH) == USART2) || \
((PERIPH) == USART3) || \
((PERIPH) == UART4) || \
((PERIPH) == UART5) || \
((PERIPH) == USART6) || \
((PERIPH) == UART7) || \
((PERIPH) == UART8) || \
((PERIPH) == UART9) || \
((PERIPH) == UART10))

#define IS_USART_1236_PERIPH(PERIPH) (((PERIPH) == USART1) || \
((PERIPH) == USART2) || \
((PERIPH) == USART3) || \
((PERIPH) == USART6))

USART_Word_Length


/** @defgroup USART_Word_Length
* @{
*/

#define USART_WordLength_8b ((uint16_t)0x0000)
#define USART_WordLength_9b ((uint16_t)0x1000)

#define IS_USART_WORD_LENGTH(LENGTH) (((LENGTH) == USART_WordLength_8b) || \
((LENGTH) == USART_WordLength_9b))

USART_Stop_Bits

/** @defgroup USART_Stop_Bits
* @{
*/

#define USART_StopBits_1 ((uint16_t)0x0000)
#define USART_StopBits_0_5 ((uint16_t)0x1000)
#define USART_StopBits_2 ((uint16_t)0x2000)
#define USART_StopBits_1_5 ((uint16_t)0x3000)
#define IS_USART_STOPBITS(STOPBITS) (((STOPBITS) == USART_StopBits_1) || \
((STOPBITS) == USART_StopBits_0_5) || \
((STOPBITS) == USART_StopBits_2) || \
((STOPBITS) == USART_StopBits_1_5))

USART_Parity

/** @defgroup USART_Parity
* @{
*/

#define USART_Parity_No ((uint16_t)0x0000)
#define USART_Parity_Even ((uint16_t)0x0400)
#define USART_Parity_Odd ((uint16_t)0x0600)
#define IS_USART_PARITY(PARITY) (((PARITY) == USART_Parity_No) || \
((PARITY) == USART_Parity_Even) || \
((PARITY) == USART_Parity_Odd))

USART_Mode

/** @defgroup USART_Mode
* @{
*/

#define USART_Mode_Rx ((uint16_t)0x0004)
#define USART_Mode_Tx ((uint16_t)0x0008)
#define IS_USART_MODE(MODE) ((((MODE) & (uint16_t)0xFFF3) == 0x00) && ((MODE) != (uint16_t)0x00))

USART_Hardware_Flow_Control

/** @defgroup USART_Hardware_Flow_Control
* @{
*/
#define USART_HardwareFlowControl_None ((uint16_t)0x0000)
#define USART_HardwareFlowControl_RTS ((uint16_t)0x0100)
#define USART_HardwareFlowControl_CTS ((uint16_t)0x0200)
#define USART_HardwareFlowControl_RTS_CTS ((uint16_t)0x0300)
#define IS_USART_HARDWARE_FLOW_CONTROL(CONTROL)\
(((CONTROL) == USART_HardwareFlowControl_None) || \
((CONTROL) == USART_HardwareFlowControl_RTS) || \
((CONTROL) == USART_HardwareFlowControl_CTS) || \
((CONTROL) == USART_HardwareFlowControl_RTS_CTS))

USART_Clock

/** @defgroup USART_Clock
* @{
*/
#define USART_Clock_Disable ((uint16_t)0x0000)
#define USART_Clock_Enable ((uint16_t)0x0800)
#define IS_USART_CLOCK(CLOCK) (((CLOCK) == USART_Clock_Disable) || \
((CLOCK) == USART_Clock_Enable))

USART_Clock_Polarity


/** @defgroup USART_Clock_Polarity
* @{
*/

#define USART_CPOL_Low ((uint16_t)0x0000)
#define USART_CPOL_High ((uint16_t)0x0400)
#define IS_USART_CPOL(CPOL) (((CPOL) == USART_CPOL_Low) || ((CPOL) == USART_CPOL_High))

USART_Clock_Phase

/** @defgroup USART_Clock_Phase
* @{
*/

#define USART_CPHA_1Edge ((uint16_t)0x0000)
#define USART_CPHA_2Edge ((uint16_t)0x0200)
#define IS_USART_CPHA(CPHA) (((CPHA) == USART_CPHA_1Edge) || ((CPHA) == USART_CPHA_2Edge))

USART_Last_Bit

/** @defgroup USART_Last_Bit
* @{
*/

#define USART_LastBit_Disable ((uint16_t)0x0000)
#define USART_LastBit_Enable ((uint16_t)0x0100)
#define IS_USART_LASTBIT(LASTBIT) (((LASTBIT) == USART_LastBit_Disable) || \
((LASTBIT) == USART_LastBit_Enable))

USART_Interrupt_definition

/** @defgroup USART_Interrupt_definition
* @{
*/

#define USART_IT_PE ((uint16_t)0x0028)
#define USART_IT_TXE ((uint16_t)0x0727)
#define USART_IT_TC ((uint16_t)0x0626)
#define USART_IT_RXNE ((uint16_t)0x0525)
#define USART_IT_ORE_RX ((uint16_t)0x0325) /* In case interrupt is generated if the RXNEIE bit is set */
#define USART_IT_IDLE ((uint16_t)0x0424)
#define USART_IT_LBD ((uint16_t)0x0846)
#define USART_IT_CTS ((uint16_t)0x096A)
#define USART_IT_ERR ((uint16_t)0x0060)
#define USART_IT_ORE_ER ((uint16_t)0x0360) /* In case interrupt is generated if the EIE bit is set */
#define USART_IT_NE ((uint16_t)0x0260)
#define USART_IT_FE ((uint16_t)0x0160)

#define IS_USART_CONFIG_IT(IT) (((IT) == USART_IT_PE) || ((IT) == USART_IT_TXE) || \
((IT) == USART_IT_TC) || ((IT) == USART_IT_RXNE) || \
((IT) == USART_IT_IDLE) || ((IT) == USART_IT_LBD) || \
((IT) == USART_IT_CTS) || ((IT) == USART_IT_ERR))
#define IS_USART_GET_IT(IT) (((IT) == USART_IT_PE) || ((IT) == USART_IT_TXE) || \
((IT) == USART_IT_TC) || ((IT) == USART_IT_RXNE) || \
((IT) == USART_IT_IDLE) || ((IT) == USART_IT_LBD) || \
((IT) == USART_IT_CTS) || ((IT) == USART_IT_ORE) || \
((IT) == USART_IT_ORE_RX) || ((IT) == USART_IT_ORE_ER) || \
((IT) == USART_IT_NE) || ((IT) == USART_IT_FE))
#define IS_USART_CLEAR_IT(IT) (((IT) == USART_IT_TC) || ((IT) == USART_IT_RXNE) || \
((IT) == USART_IT_LBD) || ((IT) == USART_IT_CTS))

USART_DMA_Requests

/** @defgroup USART_DMA_Requests
* @{
*/

#define USART_DMAReq_Tx ((uint16_t)0x0080)
#define USART_DMAReq_Rx ((uint16_t)0x0040)
#define IS_USART_DMAREQ(DMAREQ) ((((DMAREQ) & (uint16_t)0xFF3F) == 0x00) && ((DMAREQ) != (uint16_t)0x00))

USART_WakeUp_methods

/** @defgroup USART_WakeUp_methods
* @{
*/

#define USART_WakeUp_IdleLine ((uint16_t)0x0000)
#define USART_WakeUp_AddressMark ((uint16_t)0x0800)
#define IS_USART_WAKEUP(WAKEUP) (((WAKEUP) == USART_WakeUp_IdleLine) || \
((WAKEUP) == USART_WakeUp_AddressMark))

USART_LIN_Break_Detection_Length

/** @defgroup USART_LIN_Break_Detection_Length
* @{
*/

#define USART_LINBreakDetectLength_10b ((uint16_t)0x0000)
#define USART_LINBreakDetectLength_11b ((uint16_t)0x0020)
#define IS_USART_LIN_BREAK_DETECT_LENGTH(LENGTH) \
(((LENGTH) == USART_LINBreakDetectLength_10b) || \
((LENGTH) == USART_LINBreakDetectLength_11b))

USART_IrDA_Low_Power

/** @defgroup USART_IrDA_Low_Power
* @{
*/

#define USART_IrDAMode_LowPower ((uint16_t)0x0004)
#define USART_IrDAMode_Normal ((uint16_t)0x0000)
#define IS_USART_IRDA_MODE(MODE) (((MODE) == USART_IrDAMode_LowPower) || \
((MODE) == USART_IrDAMode_Normal))

USART_Flags

/** @defgroup USART_Flags
* @{
*/

#define USART_FLAG_CTS ((uint16_t)0x0200)
#define USART_FLAG_LBD ((uint16_t)0x0100)
#define USART_FLAG_TXE ((uint16_t)0x0080)
#define USART_FLAG_TC ((uint16_t)0x0040)
#define USART_FLAG_RXNE ((uint16_t)0x0020)
#define USART_FLAG_IDLE ((uint16_t)0x0010)
#define USART_FLAG_ORE ((uint16_t)0x0008)
#define USART_FLAG_NE ((uint16_t)0x0004)
#define USART_FLAG_FE ((uint16_t)0x0002)
#define USART_FLAG_PE ((uint16_t)0x0001)
#define IS_USART_FLAG(FLAG) (((FLAG) == USART_FLAG_PE) || ((FLAG) == USART_FLAG_TXE) || \
((FLAG) == USART_FLAG_TC) || ((FLAG) == USART_FLAG_RXNE) || \
((FLAG) == USART_FLAG_IDLE) || ((FLAG) == USART_FLAG_LBD) || \
((FLAG) == USART_FLAG_CTS) || ((FLAG) == USART_FLAG_ORE) || \
((FLAG) == USART_FLAG_NE) || ((FLAG) == USART_FLAG_FE))

#define IS_USART_CLEAR_FLAG(FLAG) ((((FLAG) & (uint16_t)0xFC9F) == 0x00) && ((FLAG) != (uint16_t)0x00))

#define IS_USART_BAUDRATE(BAUDRATE) (((BAUDRATE) > 0) && ((BAUDRATE) < 7500001))
#define IS_USART_ADDRESS(ADDRESS) ((ADDRESS) <= 0xF)
#define IS_USART_DATA(DATA) ((DATA) <= 0x1FF)

03. USART相关其它宏

USART_TypeDef

/**
* @brief Universal Synchronous Asynchronous Receiver Transmitter
*/

typedef struct
{
__IO uint16_t SR; /*!< USART Status register, Address offset: 0x00 */
uint16_t RESERVED0; /*!< Reserved, 0x02 */
__IO uint16_t DR; /*!< USART Data register, Address offset: 0x04 */
uint16_t RESERVED1; /*!< Reserved, 0x06 */
__IO uint16_t BRR; /*!< USART Baud rate register, Address offset: 0x08 */
uint16_t RESERVED2; /*!< Reserved, 0x0A */
__IO uint16_t CR1; /*!< USART Control register 1, Address offset: 0x0C */
uint16_t RESERVED3; /*!< Reserved, 0x0E */
__IO uint16_t CR2; /*!< USART Control register 2, Address offset: 0x10 */
uint16_t RESERVED4; /*!< Reserved, 0x12 */
__IO uint16_t CR3; /*!< USART Control register 3, Address offset: 0x14 */
uint16_t RESERVED5; /*!< Reserved, 0x16 */
__IO uint16_t GTPR; /*!< USART Guard time and prescaler register, Address offset: 0x18 */
uint16_t RESERVED6; /*!< Reserved, 0x1A */
} USART_TypeDef;

/******************************************************************************/
/* */
/* Universal Synchronous Asynchronous Receiver Transmitter */
/* */
/******************************************************************************/
/******************* Bit definition for USART_SR register *******************/
#define USART_SR_PE ((uint16_t)0x0001) /*!<Parity Error */
#define USART_SR_FE ((uint16_t)0x0002) /*!<Framing Error */
#define USART_SR_NE ((uint16_t)0x0004) /*!<Noise Error Flag */
#define USART_SR_ORE ((uint16_t)0x0008) /*!<OverRun Error */
#define USART_SR_IDLE ((uint16_t)0x0010) /*!<IDLE line detected */
#define USART_SR_RXNE ((uint16_t)0x0020) /*!<Read Data Register Not Empty */
#define USART_SR_TC ((uint16_t)0x0040) /*!<Transmission Complete */
#define USART_SR_TXE ((uint16_t)0x0080) /*!<Transmit Data Register Empty */
#define USART_SR_LBD ((uint16_t)0x0100) /*!<LIN Break Detection Flag */
#define USART_SR_CTS ((uint16_t)0x0200) /*!<CTS Flag */

/******************* Bit definition for USART_DR register *******************/
#define USART_DR_DR ((uint16_t)0x01FF) /*!<Data value */

/****************** Bit definition for USART_BRR register *******************/
#define USART_BRR_DIV_Fraction ((uint16_t)0x000F) /*!<Fraction of USARTDIV */
#define USART_BRR_DIV_Mantissa ((uint16_t)0xFFF0) /*!<Mantissa of USARTDIV */

/****************** Bit definition for USART_CR1 register *******************/
#define USART_CR1_SBK ((uint16_t)0x0001) /*!<Send Break */
#define USART_CR1_RWU ((uint16_t)0x0002) /*!<Receiver wakeup */
#define USART_CR1_RE ((uint16_t)0x0004) /*!<Receiver Enable */
#define USART_CR1_TE ((uint16_t)0x0008) /*!<Transmitter Enable */
#define USART_CR1_IDLEIE ((uint16_t)0x0010) /*!<IDLE Interrupt Enable */
#define USART_CR1_RXNEIE ((uint16_t)0x0020) /*!<RXNE Interrupt Enable */
#define USART_CR1_TCIE ((uint16_t)0x0040) /*!<Transmission Complete Interrupt Enable */
#define USART_CR1_TXEIE ((uint16_t)0x0080) /*!<PE Interrupt Enable */
#define USART_CR1_PEIE ((uint16_t)0x0100) /*!<PE Interrupt Enable */
#define USART_CR1_PS ((uint16_t)0x0200) /*!<Parity Selection */
#define USART_CR1_PCE ((uint16_t)0x0400) /*!<Parity Control Enable */
#define USART_CR1_WAKE ((uint16_t)0x0800) /*!<Wakeup method */
#define USART_CR1_M ((uint16_t)0x1000) /*!<Word length */
#define USART_CR1_UE ((uint16_t)0x2000) /*!<USART Enable */
#define USART_CR1_OVER8 ((uint16_t)0x8000) /*!<USART Oversampling by 8 enable */

/****************** Bit definition for USART_CR2 register *******************/
#define USART_CR2_ADD ((uint16_t)0x000F) /*!<Address of the USART node */
#define USART_CR2_LBDL ((uint16_t)0x0020) /*!<LIN Break Detection Length */
#define USART_CR2_LBDIE ((uint16_t)0x0040) /*!<LIN Break Detection Interrupt Enable */
#define USART_CR2_LBCL ((uint16_t)0x0100) /*!<Last Bit Clock pulse */
#define USART_CR2_CPHA ((uint16_t)0x0200) /*!<Clock Phase */
#define USART_CR2_CPOL ((uint16_t)0x0400) /*!<Clock Polarity */
#define USART_CR2_CLKEN ((uint16_t)0x0800) /*!<Clock Enable */

#define USART_CR2_STOP ((uint16_t)0x3000) /*!<STOP[1:0] bits (STOP bits) */
#define USART_CR2_STOP_0 ((uint16_t)0x1000) /*!<Bit 0 */
#define USART_CR2_STOP_1 ((uint16_t)0x2000) /*!<Bit 1 */

#define USART_CR2_LINEN ((uint16_t)0x4000) /*!<LIN mode enable */

/****************** Bit definition for USART_CR3 register *******************/
#define USART_CR3_EIE ((uint16_t)0x0001) /*!<Error Interrupt Enable */
#define USART_CR3_IREN ((uint16_t)0x0002) /*!<IrDA mode Enable */
#define USART_CR3_IRLP ((uint16_t)0x0004) /*!<IrDA Low-Power */
#define USART_CR3_HDSEL ((uint16_t)0x0008) /*!<Half-Duplex Selection */
#define USART_CR3_NACK ((uint16_t)0x0010) /*!<Smartcard NACK enable */
#define USART_CR3_SCEN ((uint16_t)0x0020) /*!<Smartcard mode enable */
#define USART_CR3_DMAR ((uint16_t)0x0040) /*!<DMA Enable Receiver */
#define USART_CR3_DMAT ((uint16_t)0x0080) /*!<DMA Enable Transmitter */
#define USART_CR3_RTSE ((uint16_t)0x0100) /*!<RTS Enable */
#define USART_CR3_CTSE ((uint16_t)0x0200) /*!<CTS Enable */
#define USART_CR3_CTSIE ((uint16_t)0x0400) /*!<CTS Interrupt Enable */
#define USART_CR3_ONEBIT ((uint16_t)0x0800) /*!<USART One bit method enable */

/****************** Bit definition for USART_GTPR register ******************/
#define USART_GTPR_PSC ((uint16_t)0x00FF) /*!<PSC[7:0] bits (Prescaler value) */
#define USART_GTPR_PSC_0 ((uint16_t)0x0001) /*!<Bit 0 */
#define USART_GTPR_PSC_1 ((uint16_t)0x0002) /*!<Bit 1 */
#define USART_GTPR_PSC_2 ((uint16_t)0x0004) /*!<Bit 2 */
#define USART_GTPR_PSC_3 ((uint16_t)0x0008) /*!<Bit 3 */
#define USART_GTPR_PSC_4 ((uint16_t)0x0010) /*!<Bit 4 */
#define USART_GTPR_PSC_5 ((uint16_t)0x0020) /*!<Bit 5 */
#define USART_GTPR_PSC_6 ((uint16_t)0x0040) /*!<Bit 6 */
#define USART_GTPR_PSC_7 ((uint16_t)0x0080) /*!<Bit 7 */

#define USART_GTPR_GT ((uint16_t)0xFF00) /*!<Guard time value */

04. USART相关函数

/*  Function used to set the USART configuration to the default reset state ***/
void USART_DeInit(USART_TypeDef* USARTx);

/* Initialization and Configuration functions *********************************/
void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct);
void USART_StructInit(USART_InitTypeDef* USART_InitStruct);
void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct);
void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct);
void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState);
void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler);
void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState);
void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState);

/* Data transfers functions ***************************************************/
void USART_SendData(USART_TypeDef* USARTx, uint16_t Data);
uint16_t USART_ReceiveData(USART_TypeDef* USARTx);

/* Multi-Processor Communication functions ************************************/
void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address);
void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp);
void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState);

/* LIN mode functions *********************************************************/
void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength);
void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState);
void USART_SendBreak(USART_TypeDef* USARTx);

/* Half-duplex mode function **************************************************/
void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState);

/* Smartcard mode functions ***************************************************/
void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState);
void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState);
void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime);

/* IrDA mode functions ********************************************************/
void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode);
void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState);

/* DMA transfers management functions *****************************************/
void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState);

/* Interrupts and flags management functions **********************************/
void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState);
FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG);
void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG);
ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT);
void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT);

05. USART其它

USART基地址

#define USART2_BASE           (APB1PERIPH_BASE + 0x4400)
#define USART3_BASE (APB1PERIPH_BASE + 0x4800)
#define UART4_BASE (APB1PERIPH_BASE + 0x4C00)
#define UART5_BASE (APB1PERIPH_BASE + 0x5000)

#define USART1_BASE (APB2PERIPH_BASE + 0x1000)
#define USART6_BASE (APB2PERIPH_BASE + 0x1400)
#define UART9_BASE (APB2PERIPH_BASE + 0x1800U)
#define UART10_BASE (APB2PERIPH_BASE + 0x1C00U)

06. 附录

6.1 【STM32】STM32系列教程汇总

网址:【STM32】STM32系列教程汇总

07. 声明

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【STM32】USART相关函数和类型

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