1.7.3USART固件函數(shù)庫項目一11一月2026智能電子產(chǎn)品設(shè)計與制作主要內(nèi)容USART固件函數(shù)庫4.USART固件函數(shù)庫（1）函數(shù)USART_Init函數(shù)原型：voidUSART_Init(USART_TypeDef*USARTx,USART_InitTypeDef*USART_InitStruct)函數(shù)功能：根據(jù)USART_InitStruct中指定的參數(shù)初始化外設(shè)USARTx寄存器。USART_InitStruct指向USART_InitTypeDef的指針，USART_InitTypeDef結(jié)構(gòu)體定義于stm32f0xx_usart.h文件中。其結(jié)構(gòu)體如下：typedefstruct{uint32_tUSART_BaudRate;//波特率設(shè)置uint32_tUSART_WordLength;//數(shù)據(jù)寬度設(shè)置uint32_tUSART_StopBits;//停止位位數(shù)設(shè)置uint32_tUSART_Parity;//奇偶校驗設(shè)置uint32_tUSART_Mode;//USART模式設(shè)置，發(fā)送和接收模式uint32_tUSART_HardwareFlowControl;//硬件流控制設(shè)置}USART_InitTypeDef;4.USART固件函數(shù)庫實例：USART_InitTypeDefUSART_InitStructure;USART_InitStructure.USART_BaudRate=9600;//波特率配置USART_InitStructure.USART_WordLength=USART_WordLength_8b;//數(shù)據(jù)位8位USART_InitStructure.USART_StopBits=USART_StopBits_1;//停止位1位USART_InitStructure.USART_Parity=USART_Parity_No;//奇偶校驗位無USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;//禁止流控制USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;//使能發(fā)送接收USART_Init(USART2,&USART_InitStructure);4.USART固件函數(shù)庫（2）函數(shù)USART_Cmd函數(shù)原型：voidUSART_Cmd(USART_TypeDef*USARTx,FunctionalStateNewState)函數(shù)功能：使能USARTx實例：USART_Cmd(USART2,ENABLE);//使能USART2（3）函數(shù)USART_SendData函數(shù)原型：voidUSART_SendData(USART_TypeDef*USARTx,uint16_tData)函數(shù)功能：發(fā)送一個字節(jié)數(shù)據(jù)實例：USART_SendData(USART2,0x25);//通過串口2發(fā)送數(shù)據(jù)0x254.USART固件函數(shù)庫（4）函數(shù)USART_ReceiveData函數(shù)原型：uint16_tUSART_ReceiveData(USART_TypeDef*USARTx)函數(shù)功能：接收一個數(shù)據(jù)實例：uint16_tReceive;Receive=USART_ReceiveData(USART2);//接收數(shù)據(jù)（5）函數(shù)USART_ITConfig函數(shù)原型：voidUSART_ITConfig(USART_TypeDef*USARTx,uint32_tUSART_IT,FunctionalStateNewState)函數(shù)功能：使能USART對應(yīng)的中斷實例：USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);//使能接收完成中斷4.USART固件函數(shù)庫（6）函數(shù)USART_GetFlagStatus函數(shù)原型：FlagStatusUSART_GetFlagStatus(USART_TypeDef*USARTx,uint32_tUSART_FLAG)函數(shù)功能：讀取中斷標志位狀態(tài)實例：uint8_tFlag;Flag=USART_GetFlagStatus(USART2,USART_FLAG_TXE);//獲取發(fā)送寄存器空標志（7）函數(shù)USART_ClearFlag函數(shù)原型：voidUSART_ClearFlag(USART_TypeDef*USARTx,uint32_tUSART_FLAG)函數(shù)功能：清除中斷標志位狀態(tài)實例：USART_ClearFlag(USART2,USART_FLAG_TXE);//清除發(fā)送寄存器空標志4.USART固件函數(shù)庫（8）函數(shù)USART_GetITStatus函數(shù)原型：ITStatusUSART_GetITStatus(USART_TypeDef*USARTx,uint32_tUSART_IT)函數(shù)功能：獲取是否產(chǎn)生中斷實例：uint8_tFlag;Flag=USART_GetITStatus(USART2,USART_IT_TXE);//獲取發(fā)送寄存器空中斷（9）函數(shù)USART_ClearITPendingBit函數(shù)原型：voidUSART_ClearITPendingBit(USART_TypeDef*USARTx,uint32_tUSART_IT)函數(shù)功能：清除中斷掛起標志位實例：USART_ClearITPendingBit(USART2,USART_IT_RXNE);4.USART固件函數(shù)庫USART_GetFlagStatus和USART_GetITStatus兩者容易混淆，其區(qū)別在于：USART_GetFlagStatus返回值是中斷標志位狀態(tài)，讀取的是狀態(tài)ISR寄存器，該函數(shù)只判斷標志位，在