void USART4_Configuration(void)
{  USART_InitTypeDef USART_InitStructure;
 RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE  );
             
 USART_InitStructure.USART_BaudRate = 9600;        // 波特率
 USART_InitStructure.USART_WordLength = USART_WordLength_8b;     // 8位数据
 USART_InitStructure.USART_StopBits = USART_StopBits_1;      // 在帧结尾传输1个停止位
 USART_InitStructure.USART_Parity = USART_Parity_No ;      // 奇偶失能
 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // 硬件流控制失能
 
 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;    // 发送使能+接收使能
 
 USART_Init(UART4, &USART_InitStructure);
    
 
 USART_ClearFlag(UART4, USART_IT_RXNE);    //清中断，以免一启用中断后立即产生中断
 USART_ITConfig(UART4,USART_IT_RXNE, ENABLE);  //使能USART4中断源
 USART_Cmd(UART4, ENABLE);       //USART4总开关：开启  
}
void NVIC_Configuration(void)
{
 NVIC_InitTypeDef NVIC_InitStructure;
 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
 
 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 NVIC_Init(&NVIC_InitStructure);
   NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);   
  NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 NVIC_Init(&NVIC_InitStructure); }   当我配置好UART4的中断以后。程序运行死机。 当我注销掉这段。程序就运行正常。 /*  NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 NVIC_Init(&NVIC_InitStructure); */ 求助 谁知道为什么 此帖出自小平头技术问答