串列埠相關配置

GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;          
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
  GPIO_InitStructure.GPIO
 
_Speed = GPIO_Speed_50MHz; 
  GPIO_Init(GPIOA, &GPIO_InitStructure);           

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;            
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
  GPIO_Init(GPIOA, &GPIO_InitStructure);


  USART_InitStructure.USART
 
_BaudRate = 115200;
  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(USART1, &USART_InitStructure); 
  //USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);   //接收中斷  
  //USART_ITConfig(USART1, USART_IT_TXE, ENABLE);      //傳送中斷
  USART_Cmd(USART1, ENABLE);
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //接收中斷使能

串列埠中斷配置

NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);                       
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;   
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; 
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
  NVIC_Init(&NVIC_InitStructure); 

重定向fputc，並勾選Options - Target 中的Use Micro LIB

    USART_SendData(USART1, (uint8_t) ch);

    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
          {}

    return ch;

串列埠中斷服務函式，接收字串的關鍵

u8 i=0; 
    if(USART_GetFlagStatus(USART1,USART_IT_RXNE)==SET) 
    {
            if(USART_ReceiveData(USART1)=='\n')  //串列埠除錯助手必須是點上換行符
                { 
                    sp=0;
                    USART_REC_Finish_FLAG = 1;
                    for(i=0;i<20;i++)           //i 字串長度
                    Rec_Buffer[i]='\0';
                }
                else
                    {
                        if(sp==0)
                            {
                                for(i=0;i<20;i++)
                                SendData[i]='\0';
                            }   
                            Rec_Buffer[sp] = USART_ReceiveData(USART1);
                            SendData[sp]= Rec_Buffer[sp];
                            sp=sp+1;
                    }
        }
        if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) 
    { 
        USART_ClearITPendingBit(USART1, USART_IT_RXNE); //清除接收中斷標誌

    }

主函式

while(USART_REC_Finish_FLAG == 1)                       //等待串列埠接收完成標誌位置1
        {   
            delay(1000);            //延時1ms

            USART_REC_Finish_FLAG = 0;      //使用完成後將串列埠標誌位置〇



            if(strcmp(SendData, LED1ON)==0)                     //比較字串 
                ch = '1';
            else if(strcmp(SendData, LED1OFF)==0)
                ch = '2';
            else
                ch = '3';
            printf("%c  \r\n",ch);


            switch(ch)
            {
                case '1':
                    LED1_ON;
                    printf("LED1 ON\r\n");
                break;
                case '2':
                    LED1_OFF;
                    printf("LED1 OFF\r\n");
                break;
                case '3':
                    LED2_TOGGLE;
                    printf("LED2 TOGGLE\r\n");
                break;
                default:
                    printf("Error!\r\n");
                break;
            }

        }

效果如圖