STM32f103rc串口2可以接收可以进接收中断，但是不能发送

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使用串口1的接收发送都是OK的。
void Uart2Init(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
       
        Uart2ConfigNVIC();

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
       
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);//执行上面的gpio初始化
       
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
        //GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);

        //USART初始化
        USART_InitStructure.USART_BaudRate = 9600;
        USART_InitStructure.USART_WordLength = USART_WordLength_8b;
        USART_InitStructure.USART_StopBits = USART_StopBits_1;
        USART_InitStructure.USART_Parity = USART_Parity_No ;//Even偶，Odd奇，No无
        USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
        USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
        USART_Init(USART2, &USART_InitStructure);
        USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
        //USART_ITConfig(USART2, USART_IT_TC, ENABLE);

        USART_Cmd(USART2, ENABLE);
}

static void Uart1ConfigNVIC(void)
{
        NVIC_InitTypeDef NVIC_InitStructure;
       
        /* Enable the USARTy Interrupt */
        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;         
        //设置串口1的中断优先级为PRIORITY_UART1
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 6;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);
}
static void Uart2ConfigNVIC(void)
{
        NVIC_InitTypeDef NVIC_InitStructure;
       
        /* Enable the USARTy Interrupt */
        NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;         
        //设置串口1的中断优先级为PRIORITY_UART1
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 6;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);
}

void Uart1Init(void)
{
        //gpio，usart初始化结构体定义
        //当gpio复用时（开启外设时），需要初始化同时gpio和ppp外设，并对他们使能和开启时钟
        GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
       
        Uart1ConfigNVIC();
       
        //开启gpio和外设时钟
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

        //gpio初始化结构体成员赋值
        //初始化PA9，复用推挽输出.GPIO_Mode_Out_PP
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
//        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);//执行上面的gpio初始化

        // PA10上拉输入
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
        GPIO_Init(GPIOA, &GPIO_InitStructure);

        USART_InitStructure.USART_BaudRate = 9600;
        USART_InitStructure.USART_WordLength = USART_WordLength_8b;//注意此处9位包含了校验位
        USART_InitStructure.USART_StopBits = USART_StopBits_1;
        USART_InitStructure.USART_Parity = USART_Parity_No ;//Even偶，Odd奇，No无
        USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
        USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

        //执行上面的操作
        USART_Init(USART1, &USART_InitStructure);
       
        /* 使能串口1接收中断 */
        USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
       
        /* 使能串口1发送完成中断 */
        //USART_ITConfig(USART1, USART_IT_TC, ENABLE);
       
        //调用USART_Cmd() 使能USART1外设。
        //在使用外设时，不仅要使能其时钟，还要调用此函数使能外设才可以正常使用。
        USART_Cmd(USART1, ENABLE);
}


在while中用while(USART_GetFlagStatus(USART2, USART_FLAG_TC)==RESET);
                  USART_SendData(USART2,0x11);发送也没有发送出来的，但是都可以接收

正点原子

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