【单片机】CH32V103串口IDLE空闲中断

CH32V103c8t6 在寻找解决接收完数据后，怎么即时判断数据已经完成了接收。发现串口有一个IDLE空闲中断。如下图描述：

意思是在串口接收完一帧数据 会产生一个中断，此时程序可判断为数据已接收完毕。

测试例程如下：

一、串口初始化：

void User_USART_Init(uint32_t baudrate)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
  NVIC_InitTypeDef  NVIC_InitStructure;
 
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
 
  /* USART2 TX-->A.2   RX-->A.3 */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
 
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
 
  USART_InitStructure.USART_BaudRate = 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_Tx | USART_Mode_Rx;
 
  USART_Init(USART2, &USART_InitStructure);
 
  /*打开串口中断*/
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
 
  /*打开IDLE数据检测中断*/
  USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
 
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
 
  USART_Cmd(USART2, ENABLE);
  USART_SetAddress(USART2, 0x1);
 
}

　二、串口中断程序

/*idle 数据检测中断测试*/
void USART2_IRQHandler(void)
{
    uint16_t Clear = Clear;
 
    /*如果接收到一个字节*/
    if(USART_GetITStatus(USART2,USART_IT_RXNE)!= RESET)
    {
        USART_RX_BUF[RxCounter++]= USART_ReceiveData(USART2);
    }
    /*如果接收到一帧数据*/
    else if(USART_GetITStatus(USART2, USART_IT_IDLE)!= RESET)
    {
        Clear = USART2->STATR;
        Clear = USART2->DATAR;
 
        strcpy(UsartData,USART_RX_BUF);
 
        /*清空串口接收数组*/
        memset(USART_RX_BUF, 0, sizeof (USART_RX_BUF));

　　　　　/*重置接收数组指针*/
        RxCounter = 0;
        USART_RX_STA = 1;
 
    }
 
}

　三、测试接收效果：将收到数据原路发回

	    if(USART_RX_STA == 1)
	    {
 
	        USART_Send_String(USART2,UsartData);
	        memset(UsartData, 0, sizeof (UsartData));
	        USART_RX_STA = 0;
	    }