[stm32] USART USART1收发功能工程

 1 void USART_Config(USART_TypeDef* USARTx){
 2   USART_InitStructure.USART_BaudRate = 19200;                        //速率19200bps
 3   USART_InitStructure.USART_WordLength = USART_WordLength_8b;        //数据位8位
 4   USART_InitStructure.USART_StopBits = USART_StopBits_1;            //停止位1位
 5   USART_InitStructure.USART_Parity = USART_Parity_No;                //无校验位
 6   USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;  //无硬件流控
 7   USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;    //收发模式
 8   /* Configure USART1 */
 9   USART_Init(USARTx, &USART_InitStructure);                //配置串口参数函数
10   /* Enable USART1 Receive and Transmit interrupts */
11   USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);                //使能接收中断
12   USART_ITConfig(USART1, USART_IT_TXE, ENABLE);                //使能发送缓冲空中断   
13   /* Enable the USART1 */
14   USART_Cmd(USART1, ENABLE);    
15 }

1 void RCC_Configuration(void){
2    SystemInit(); 
3    RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 |RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO  , ENABLE);  
4 }

 1 void GPIO_Configuration(void){
 2   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;                     //LED1控制--PB5
 3   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;             //推挽输出
 4   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 5   GPIO_Init(GPIOB, &GPIO_InitStructure);                     
 6 
 7   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;                      //USART1 TX
 8   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;             //复用推挽输出
 9   GPIO_Init(GPIOA, &GPIO_InitStructure);                     //A端口 
10 
11   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;                  //USART1 RX
12   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   //复用开漏输入
13   GPIO_Init(GPIOA, &GPIO_InitStructure);                      //A端口 
14 }

 1 void NVIC_Configuration(void){
 2   /*  结构声明*/
 3   NVIC_InitTypeDef NVIC_InitStructure;
 4 
 5   /* Configure the NVIC Preemption Priority Bits */  
 6   /* Configure one bit for preemption priority */
 7   /* 优先级组 说明了抢占优先级所用的位数，和子优先级所用的位数   在这里是1， 7 */    
 8   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);      
 9   NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;                     //设置串口1中断
10   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;             //抢占优先级 0
11   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;                //子优先级为0
12   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                    //使能
13   NVIC_Init(&NVIC_InitStructure);
14 }

 1 int main(void){
 2   uint8_t a=0;//LED高低电压控制
 3   RCC_Configuration();                                              //系统时钟设置    
 4   NVIC_Configuration();                                              //中断源配置
 5   GPIO_Configuration();                    //端口初始化
 6   USART_Config(USART1);                    //串口1初始化
 7   
 8   while (1){
 9     if(rec_f==1){            //判断是否收到一帧有效数据
10         rec_f=0;
11         for(i=0;i<sizeof(TxBuffer1);i++)//发送字符串
12         {
13             USART_SendChar(USART1,TxBuffer1[i]);
14             Delay(0x0000ff00);
15         }
16         if(a==0){GPIO_SetBits(GPIOB, GPIO_Pin_5);a=1;}          //LED1  明暗闪烁                
17         else{GPIO_ResetBits(GPIOB, GPIO_Pin_5);a=0;}
18     }
19   }
20 }

1 void USART_SendChar(USART_TypeDef* USARTx,uint8_t data){
2     USART_SendData(USARTx,data);
3     while(USART_GetFlagStatus(USARTx,USART_FLAG_TC)==RESET);
4 }

 1 void USART1_IRQHandler(void)      //串口1 中断服务程序
 2 {
 3   unsigned int i;
 4   if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)       //判断读寄存器是否非空
 5   {    
 6     RxBuffer1[RxCounter1++] = USART_ReceiveData(USART1);   //将读寄存器的数据缓存到接收缓冲区里
 7     if(RxBuffer1[RxCounter1-2]==0x0d&&RxBuffer1[RxCounter1-1]==0x0a)//判断结束标志是否是0x0d 0x0a
 8     {
 9       for(i=0; i< RxCounter1; i++) TxBuffer1[i]    = RxBuffer1[i]; //将接收缓冲器的数据转到发送缓冲区，准备转发
10       rec_f=1;                                        //接收成功标志
11       TxBuffer1[RxCounter1]=0;                                  //发送缓冲区结束符    
12       TxCounter1=RxCounter1;
13       RxCounter1=0;
14     }
15   }
16   if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET)  //这段是为了避免STM32 USART 第一个字节发不出去的BUG 
17   { 
18      USART_ITConfig(USART1, USART_IT_TXE, DISABLE);    //禁止发缓冲器空中断， 
19   }     
20 }