为什么usart2可以发信号但是接受信号的时候只能进入一次中断？？

痴小吃

usart2配置如下

void UART2_init(u32 bound){

        GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;  

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //
  USART_DeInit(USART2);  //

//USART2_TX   PA.2

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

        GPIO_Init(GPIOA, &GPIO_InitStructure);  

//USART2_RX  A.3

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

        GPIO_Init(GPIOA, &GPIO_InitStructure);  

USART_InitStructure.USART_BaudRate = bound;

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(USART2, &USART_InitStructure); 

       NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 2;

NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);    

       USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

       USART_Cmd(USART2, ENABLE);                 

}

痴小吃

大哥大姐谢谢帮忙哇!

正点原子

之后呢？