stm32F030C8单片机串口利用USART_IT_IDLE接收完整的一帧

USART_IT_RXNE寄存器是在没接收到一个字节时产生中断，而USART_IT_IDLE寄存器是在接收到完整一帧后产生中断，即接收完一个字节在一个字节的时间内再无接收的话就会产生中断

下面是源码：

 
   void USART1_Config( 
   void) 
  
    {  
  
    GPIO_InitTypeDef GPIO_InitStructure;   
  
    USART_InitTypeDef USART_InitStructure; 
   //定义串口初始化结构体 
  
    NVIC_InitTypeDef NVIC_InitStruct; 
  
    RCC_AHBPeriphClockCmd(USART1_GPIO_RCC, ENABLE); 
   //使能GPIOA的时钟 
  
    RCC_APB2PeriphClockCmd(USART1_RCC, ENABLE); 
   //使能USART的时钟 
  
    GPIO_PinAFConfig(USART1_GPIO_PORT, USART1_TX_GPIO_PinSource, GPIO_AF_1); 
   //配置PA9成第二功能引脚  TX 
  
    GPIO_PinAFConfig(USART1_GPIO_PORT, USART1_RX_GPIO_PinSource, GPIO_AF_1); 
   //配置PA10成第二功能引脚 RX  
  
   /*USART1_TX ->PA9 USART1_RX ->PA10*/    
  
    GPIO_InitStructure.GPIO_Pin = USART1_TX|USART1_RX;   
   //选中串口默认输出管脚  
  
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 
   //定义输出最大速率  
  
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 
  
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; 
  
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
   //定义管脚9的模式  
  
    GPIO_Init(USART1_GPIO_PORT, &GPIO_InitStructure); 
   //调用函数，把结构体参数输入进行初始化      
  
   /*串口通讯参数设置*/ 
  
    USART_InitStructure.USART_BaudRate = UART1_BaudRate; 
   //9600; //波特率 
  
    USART_InitStructure.USART_WordLength = USART_WordLength_8b; 
   //数据位8位 
  
    USART_InitStructure.USART_StopBits = USART_StopBits_1;   
   //停止位1位 
  
    USART_InitStructure.USART_Parity = USART_Parity_No;    
   //校验位 无 
  
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; 
   //无流控制 
  
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;    
   //使能接收和发送引脚 
  
    USART_Init(USART1, &USART_InitStructure); 
  
   //USART_ClearFlag(USART1,USART_FLAG_TC);     
  
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); 
  
    USART_ITConfig(USART1, USART_IT_IDLE, ENABLE); 
  
    USART1->ICR |= 
   1<< 
   4; 
   //必须先清除IDLE中断，否则会一直进IDLE中断 
  
    USART_Cmd(USART1, ENABLE); 
  
   /* USART1的NVIC中断配置 */ 
  
    NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn; 
  
    NVIC_InitStruct.NVIC_IRQChannelPriority = 
   0x02; 
  
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; 
  
    NVIC_Init(&NVIC_InitStruct);     
  
    }

 
   /** 
  
   * @file USART1_IRQHandler 
  
   * @brief USART1中断处理 
  
   * @param 无 
  
   * @retval 无 
  
   */ 
  
   void USART1_IRQHandler( 
   void) 
  
    { 
  
    uint32_t temp = 
   0; 
  
   if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) 
  
    { 
  
   //USART_SendData(USART1,USART_ReceiveData(USART1)); 
  
   if (uart_recv[UART_1].count < UART_BUF_LEN) 
  
    { 
  
   //uart_recv_flag = 1; 
  
    uart_recv[UART_1].recv_buf[uart_recv[UART_1].count] = USART_ReceiveData(USART1); 
  
    uart_recv[UART_1].count++; 
  
    } 
  
   while (USART_GetFlagStatus(USART1,USART_FLAG_TXE) == RESET); 
  
    } 
  
   if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET) 
  
    { 
  
    USART1->ICR |= 
   1<< 
   4; 
  
    uart_recv_flag = 
   1; 
  
    UART_send(USART1, 
   "hello", 
   sizeof( 
   "hello")); 
  
    }  
  
    }

注意F0芯片的清除中断的方法是用ICR寄存器，在使能中断之后就要立即清除一次中断否则会不停的进入中断

stm32F030C8单片机串口利用USART_IT_IDLE接收完整的一帧

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