RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA時鐘

GPIO_InitTypeDef GPIO_InitStructure;
//USART1_TX GPIOA.9GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9 //USART1_RX GPIOA.10初始化GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空輸入GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10

NVIC_InitTypeDef NVIC_InitStructure;
//Usart1 NVIC 配置NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ; //搶占優(yōu)先級3NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子優(yōu)先級3NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能NVIC_Init(&NVIC_InitStructure); //根據(jù)指定的參數(shù)初始化NVIC寄存器//如果需要接收串口數(shù)據(jù)，則開啟串口接收中斷USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//開啟串口接受中斷

USART_InitTypeDef USART_InitStructure;USART_InitStructure.USART_BaudRate = bound;//串口波特率USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字長為8位數(shù)據(jù)格式USART_InitStructure.USART_StopBits = USART_StopBits_1;//一個停止位USART_InitStructure.USART_Parity = USART_Parity_No;//無奇偶校驗(yàn)位USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//無硬件數(shù)據(jù)流控制USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收發(fā)模式

USART_Init(USART1, &USART_InitStructure); //初始化串口1

USART_Cmd(USART1, ENABLE); //使能串口1

//發(fā)送一個字節(jié)void USART1_Send_Byte(u8 Data) { USART_GetFlagStatus(USART1, USART_FLAG_TC);  USART_SendData(USART1,Data); while( USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET );}
//發(fā)送字符串，遇到字符串結(jié)尾標(biāo)志'\0'結(jié)束void USART1_Send_String(u8 *Data) { while(*Data) USART1_Send_Byte(*Data++);}
//按長度發(fā)送字符串，這種方法可以發(fā)送含0x00的字符串void USART1_Send_String_By_Lens(u8 *Data, int Len){ int i; for(i=0; i<Len; i++) { USART_SendData(USART1, Data[i]);  while(USART_GetFlagStatus(USART1, USART_FLAG_TC)==RESET); //串口1發(fā)送數(shù)據(jù) }}
//重定向printf函數(shù)發(fā)送字符串，一般使用此函數(shù)直接輸出打印調(diào)試信息，使用方法跟C語言中的使用方法一致。int fputc(int ch, FILE *f){ USART_SendData( DEBUG_USARTx, (uint8_t) ch); /* 等待發(fā)送完畢 */ while (USART_GetFlagStatus(DEBUG_USARTx, USART_FLAG_TXE) == RESET); return ch;}

void USART1_IRQHandler(void) { u8 Res;
 if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //接收中斷(接收到的數(shù)據(jù)必須是0x0d 0x0a結(jié)尾) { USART_ClearFlag(USART1, USART_IT_RXNE); //清除標(biāo)志位  Res =USART_ReceiveData(USART1); //讀取接收到的數(shù)據(jù)  if((USART_RX_STA&0x8000)==0)//接收未完成 { if(USART_RX_STA&0x4000)//接收到了0x0d { if(Res==0x0D) USART_RX_STA|=0x4000; else if(Res!=0x0a) USART_RX_STA=0;//接收錯誤,重新開始 else USART_RX_STA|=0x8000; //接收完成了 } else //還沒收到0X0D {  if(Res==0x0d) USART_RX_STA|=0x4000; else { USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ; USART_RX_STA++; if(USART_RX_STA>(USART_REC_LEN-1)) USART_RX_STA=0;//接收數(shù)據(jù)錯誤,重新開始接收  }  } } }}
//接收完數(shù)據(jù)之后，在main函數(shù)中對接收到的數(shù)據(jù)進(jìn)行處理。if(USART_RX_STA&0x8000){ //得到此次接收到的數(shù)據(jù)長度，即USART_RX_BUF數(shù)組中的有效數(shù)據(jù)長度 uart1Len=USART_RX_STA&0x3f;   //對接收到的數(shù)據(jù)進(jìn)行數(shù)據(jù)處理，接收的數(shù)據(jù)暫存在USART_RX_BUF數(shù)組中  //... ...   USART_RX_STA=0;  memset(USART_RX_BUF, 0, sizeof(USART_RX_BUF)); //清空數(shù)組 }