串口4能发送 但不能进入中断接收数据

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同样的程序改成串口2就好使 串口4能发但不能收
void uart4_init(u32 bound)

{

        GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

 

RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO,ENABLE);

     //UART4_TX   PC.10

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init(GPIOC, &GPIO_InitStructure);  

    //UART4_RX  C.11

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init(GPIOC, &GPIO_InitStructure);  

   //USART 初始化设置

USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式

USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位

USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式

        USART_Init(UART4, &USART_InitStructure); //初始化串口

 #if EN_UART4_RX  //如果使能了接收  

   //uart4 NVIC 配置

        NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能

NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器

   

    USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);//开启中断

#endif

    USART_Cmd(UART4, ENABLE);                    //使能串口 

}

void USART4_SendByte(u16 temp)

{

    USART_SendData(UART4, temp);

    while(USART_GetFlagStatus(UART4, USART_FLAG_TXE) == RESET);

}

void UART4_IRQHandler(void)                 //串口4中断服务程序

{

if(USART_GetITStatus(UART4, USART_IT_RXNE) != RESET)  //接收中断

{

LED0=!LED0;                 USART_ClearITPendingBit(UART4,USART_IT_RXNE); //清除中断标志  

        } 

} 

正点原子

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