程序的大概目的：通过外部中断，按键按下后，在外部中断中会使对应的LED亮，并且通过串口发送键值以下是存在问题的代码：通过调试后发现，程序会卡死在 USART_GetFlagStatus（）中，但是程序根本就没完成串口初始化

int main()
{
        KeyInit();
        ExtiInit();
        LED_Init();
        NvicInit();
        UsartInit();
        while (1);
}

void EXTI0_IRQHandler()
{
        if (EXTI_GetITStatus(EXTI_Line0))
        {
                RLED_Toggle;
                printf("PA0 response ");
        }
        EXTI_ClearFlag(EXTI_Line0);
}

void EXTI15_10_IRQHandler()
{
        if (EXTI_GetITStatus(EXTI_Line13))
        {
                BLED_Toggle;
                printf("PC13 response ");
        }
        EXTI_ClearFlag(EXTI_Line13);
}



后来瞎鸡儿改代码，发现只是将        NvicInit(); 与UsartInit();交换了下位置程序就运行正常了
这两个函数代码如下
NvicInit(); 实现外部中断的配置
void NvicInit()
{
        NVIC_InitTypeDef NvicStructure;
        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

        NvicStructure.NVIC_IRQChannel = EXTI0_IRQn;
        NvicStructure.NVIC_IRQChannelCmd = ENABLE;
        NvicStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NvicStructure.NVIC_IRQChannelSubPriority = 0;
        NVIC_Init(&NvicStructure);

        NvicStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
        NvicStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NvicStructure.NVIC_IRQChannelSubPriority = 1;
        NVIC_Init(&NvicStructure);
}


UsartInit();实现串口中断和串口的配置
void UsartInit()
{
        UsartGpioInit();
        Init();
        NvicConfig();
}


void Init()
{
        USART_InitTypeDef        UsartStructure;
        RCC_APB2PeriphClockCmd(UsartClk, ENABLE);
        USART_StructInit(&UsartStructure);

        UsartStructure.USART_BaudRate = DeaultBaudRate;
        UsartStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
        UsartStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
        UsartStructure.USART_Parity = USART_Parity_No;
        UsartStructure.USART_StopBits = USART_StopBits_1;
        UsartStructure.USART_WordLength = USART_WordLength_8b;

        USART_Init(DefaultUsart, &UsartStructure);
        USART_Cmd(DefaultUsart, ENABLE);
        USART_ITConfig(DefaultUsart, USART_IT_RXNE, ENABLE);
}

void NvicConfig()
{
        NVIC_InitTypeDef        NvicStructure;
       
        NvicStructure.NVIC_IRQChannel = USART1_IRQn;
        NvicStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NvicStructure.NVIC_IRQChannelSubPriority = 6;
        NvicStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NvicStructure);
}


求救啊！！！大佬们、原子哥，救救孩子吧