1.串口发送函数

static void NVIC_Configuration(void){     NVIC_InitTypeDef NVIC_InitStructure;    /* Configure one bit for preemption priority */  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);    /* ÅäÖÃÖÐ¶ÏÔ´ */  NVIC_InitStructure.NVIC_IRQChannel = RS232_USART_IRQ;  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  NVIC_Init(&NVIC_InitStructure);  } /**  * @brief  RS232_USART GPIO ÅäÖÃ,¹¤×÷Ä£Ê½ÅäÖÃ¡£115200 8-N-1 £¬ÖÐ¶Ï½ÓÊÕÄ£Ê½  * @param  ÎÞ  * @retval ÎÞ  */void Debug_USART_Config(void){     GPIO_InitTypeDef GPIO_InitStructure;  USART_InitTypeDef USART_InitStructure;		  RCC_AHB1PeriphClockCmd( RS232_USART_RX_GPIO_CLK|RS232_USART_TX_GPIO_CLK, ENABLE);  /* Ê¹ÄÜ UART Ê±ÖÓ */  RCC_APB1PeriphClockCmd(RS232_USART_CLK, ENABLE);    /* Á¬½Ó PXx µ½ USARTx_Tx*/  GPIO_PinAFConfig(RS232_USART_RX_GPIO_PORT,RS232_USART_RX_SOURCE, RS232_USART_RX_AF);  /*  Á¬½Ó PXx µ½ USARTx__Rx*/  GPIO_PinAFConfig(RS232_USART_TX_GPIO_PORT,RS232_USART_TX_SOURCE,RS232_USART_TX_AF);  /* ÅäÖÃTxÒý½ÅÎª¸´ÓÃ¹¦ÄÜ  */  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  GPIO_InitStructure.GPIO_Pin = RS232_USART_TX_PIN  ;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_Init(RS232_USART_TX_GPIO_PORT, &GPIO_InitStructure);  /* ÅäÖÃRxÒý½ÅÎª¸´ÓÃ¹¦ÄÜ */  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  GPIO_InitStructure.GPIO_Pin = RS232_USART_RX_PIN;  GPIO_Init(RS232_USART_RX_GPIO_PORT, &GPIO_InitStructure);			  /* ÅäÖÃ´®¿ÚRS232_USART Ä£Ê½ */  USART_InitStructure.USART_BaudRate = RS232_USART_BAUDRATE;  USART_InitStructure.USART_WordLength = USART_WordLength_8b;  USART_InitStructure.USART_StopBits = USART_StopBits_1;  USART_InitStructure.USART_Parity = USART_Parity_No ;  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;  USART_Init(RS232_USART, &USART_InitStructure); 		NVIC_Configuration();	/*ÅäÖÃ´®¿Ú½ÓÊÕÖÐ¶Ï*/	USART_ITConfig(RS232_USART, USART_IT_RXNE, ENABLE);	  USART_Cmd(RS232_USART, ENABLE);}/*****************  ·¢ËÍÒ»¸ö×Ö·û **********************/static void Usart_SendByte( USART_TypeDef * pUSARTx, uint8_t ch ){   	/* ·¢ËÍÒ»¸ö×Ö½ÚÊý¾Ýµ½USART1 */	USART_SendData(pUSARTx,ch);	/* µÈ´ý·¢ËÍÍê±Ï */	while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);	}/*****************  Ö¸¶¨³¤¶ÈµÄ·¢ËÍ×Ö·û´® **********************/void Usart_SendStr_length( USART_TypeDef * pUSARTx, uint8_t *str,uint32_t strlen ){   	unsigned int k=0;    do     {           Usart_SendByte( pUSARTx, *(str + k) );        k++;    } while(k < strlen);}/*****************  ·¢ËÍ×Ö·û´® **********************/void Usart_SendString( USART_TypeDef * pUSARTx, uint8_t *str){   	unsigned int k=0;    do     {           Usart_SendByte( pUSARTx, *(str + k) );        k++;    } while(*(str + k)!='\0');}void Usart_Sendchar( USART_TypeDef * pUSARTx, char *str){   	unsigned int k=0;    do     {           Usart_SendByte( pUSARTx, *(str + k) );        k++;    } while(*(str + k)!='\0');}///ÖØ¶¨Ïòc¿âº¯Êýprintfµ½´®¿ÚRS232_USART£¬ÖØ¶¨Ïòºó¿ÉÊ¹ÓÃprintfº¯Êýint fputc(int ch, FILE *f){   		/* ·¢ËÍÒ»¸ö×Ö½ÚÊý¾Ýµ½´®¿ÚRS232_USART */		USART_SendData(RS232_USART, (uint8_t) ch);				/* µÈ´ý·¢ËÍÍê±Ï */		while (USART_GetFlagStatus(RS232_USART, USART_FLAG_TXE) == RESET);					return (ch);}///ÖØ¶¨Ïòc¿âº¯Êýscanfµ½´®¿ÚRS232_USART£¬ÖØÐ´Ïòºó¿ÉÊ¹ÓÃscanf¡¢getcharµÈº¯Êýint fgetc(FILE *f){   		/* µÈ´ý´®¿ÚÊäÈëÊý¾Ý */		while (USART_GetFlagStatus(RS232_USART, USART_FLAG_RXNE) == RESET);		return (int)USART_ReceiveData(RS232_USART);}

2.串口接收函数

u8 USART_RX_BUF[USART_REC_LEN];     //接收缓冲,最大USART_REC_LEN个字节.u16 USART_RX_STA=0;       //接收状态标记	    void uart_init(u32 bound){     //GPIO端口设置  GPIO_InitTypeDef GPIO_InitStructure;	USART_InitTypeDef USART_InitStructure;	NVIC_InitTypeDef NVIC_InitStructure;	 	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA,ENABLE);	//使能USART1，GPIOA时钟	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);	//使能USART1，GPIOA时钟  	//USART1_TX   GPIOA.9  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//复用推挽输出  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9     //USART1_RX	  GPIOA.10初始化  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10    //Usart1 NVIC 配置  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;		//子优先级3	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			//IRQ通道使能	NVIC_Init(&NVIC_InitStructure);	//根据指定的参数初始化VIC寄存器				//		//USART1_TX   GPIOA.9  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//复用推挽输出  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9     //USART1_RX	  GPIOA.10初始化  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.3   //Usart1 NVIC 配置//  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;	NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;		//子优先级3	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			//IRQ通道使能	NVIC_Init(&NVIC_InitStructure);	//根据指定的参数初始化VIC寄存器  		   //USART 初始化设置	USART_InitStructure.USART_BaudRate = bound;//串口波特率	USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式	USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位	USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	//收发模式  USART_Init(USART1, &USART_InitStructure); //初始化串口1//  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断  USART_Cmd(USART1, ENABLE);                    //使能串口1   USART_Init(USART2, &USART_InitStructure); //初始化串口1  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启串口接受中断  USART_Cmd(USART2, ENABLE);                    //使能串口1 }void USART1_IRQHandler(void)                	//串口1中断服务程序	{   	u8 Res;#if SYSTEM_SUPPORT_OS 		//如果SYSTEM_SUPPORT_OS为真，则需要支持OS.	OSIntEnter();    #endif	if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾) RESET=0 ！RESET =1 标志接收到了中断信号		{   		Res =USART_ReceiveData(USART1);	//读取接收到的数据  每次保存一个 串口通信  				if((USART_RX_STA&0x8000)==0)//接收未完成  保留STA的第十五位数据  如果STA的第十五位数据为0  表示接收未完成			{   			if(USART_RX_STA&0x4000)//接收到了0x0d  标志位第十五位没接收到但是接收到了第十四位为1 				{   				if(Res!=0x0a)USART_RX_STA=0;//接收错误,重新开始    标志位十四位接收到了0x0d，此时的Res值不为回车则错误				else USART_RX_STA|=0x8000;	//接收完成了 				}			else //还没收到0X0D  如果标志位第十四位也为0 				{   					if(Res==0x0d)USART_RX_STA|=0x4000;  //虽然标志位第十四位没接收到0x0d，但此时的Res值为0x0d，此时需要将STA的第十四位改为1				else					{     //虽然标志位没接收到0x0d，且此时Res的值也不为0x0d，则表示传输正在进行					USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;                    //将接收到的值放入数组。					USART_RX_STA++;                                       //接收到的个数+1					if(USART_RX_STA>(USART_REC_LEN-1))                   //如果接收到的个数大于199					 USART_RX_STA=0;                                     //接收数据错误,重新开始接收	  					}		 				}			}   		      } #if SYSTEM_SUPPORT_OS 	//如果SYSTEM_SUPPORT_OS为真，则需要支持OS.	OSIntExit();  											 #endif} #endif

3.接收数据主函数

int main(void) {   		u8 t;	u8 len;		u16 times=0;  	delay_init();	    	 //延时函数初始化		NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// 设置中断优先级分组2	uart_init(115200);	 //串口初始化为9600	LED_Init();		  	  //初始化与LED连接的硬件接口 	while(1)	{   		if(USART_RX_STA&0x8000)		{   					   			len=USART_RX_STA&0x3fff;//得到此次接收到的数据长度			printf("\r\n您发送的消息为:\r\n");			for(t=0;t<len;t++)			{   				USART1->DR=USART_RX_BUF[t];				while((USART1->SR&0X40)==0);//等待发送结束			}			printf("\r\n\r\n");//插入换行			USART_RX_STA=0;			LED0=!LED0;		}		else		{   			times++;			if(times%5000==0)			{   				printf("\r\nALIENTEK MiniSTM32开发板 串口实验\r\n");				printf("正点原子@ALIENTEK\r\n\r\n\r\n");			}			if(times%200==0)printf("请输入数据,以回车键结束\r\n");  			if(times%30==0)//闪烁LED,提示系统正在运行.			delay_ms(10);   		}	}		}