最近在使用NucleoF303K8做项目,因为找不到支持HSE的办法,所以没有使用mbed;也用过CubeMx生成代码,但如果要满足项目的需求,需要做不少的改动;于是采用F3官方标准外件库.但是在使用串口中断时遇到问题.出问题的代码如下:
void board_init(){
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_InitTypeDef USART_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
// UART Init
  //fifo_queue_reset(&usart_rx_q[0],usart_rx_buf[0],USART_RX_BUFFER_SIZE);
  //fifo_queue_reset(&usart_rx_q[1],usart_rx_buf[1],USART_RX_BUFFER_SIZE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_7);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource15, GPIO_AF_7);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_7);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_7);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  USART_InitStructure.USART_BaudRate = 115200;
  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(USART1,&USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART1, USART_IT_TC, ENABLE);
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);                                        // <--------------------------------执行到这里就挂死了，注释掉后运行恢复，但串口中断不能使用
  USART_Cmd(USART1, ENABLE);
  //RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
//USART_Init(USART2,&USART_InitStructure);
//USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
//USART_ITConfig(USART2, USART_IT_TC, ENABLE);
  //NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  //NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  //NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
  //NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  //NVIC_Init(&NVIC_InitStructure);
  //USART_Cmd(USART2, ENABLE);

SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
SysTick_Config(SystemCoreClock/1000);
//NVIC_SetPriority (SysTick_IRQn, 0);
  RCC_ClocksTypeDef clocks;
  RCC_GetClocksFreq(&clocks);
  usTicks = clocks.SYSCLK_Frequency / 1000000;
  //Serial_Init(SERIAL0, &Serial1);
  //Serial_Init(SERIAL1, &Serial2);
}

目前串口中断处理函数如下：
void USART1_IRQHandler(void){
if(USART_GetITStatus(USART1, USART_IT_ORE) != RESET){
    USART_ClearFlag(USART1,USART_FLAG_ORE);
  USART_ClearITPendingBit(USART1,USART_IT_ORE);
}
if(USART_GetITStatus(USART1, USART_IT_NE) != RESET){
    USART_ClearFlag(USART1,USART_FLAG_NE);
  USART_ClearITPendingBit(USART1,USART_IT_NE);
}
if(USART_GetITStatus(USART1, USART_IT_FE) != RESET){
    USART_ClearFlag(USART1,USART_FLAG_FE);
  USART_ClearITPendingBit(USART1,USART_IT_FE);
}
if(USART_GetITStatus(USART1, USART_IT_PE) != RESET){
    USART_ClearFlag(USART1,USART_FLAG_PE);
  USART_ClearITPendingBit(USART1,USART_IT_PE);
}
if(USART_GetITStatus(USART1, USART_IT_WU) != RESET){
    USART_ClearFlag(USART1,USART_FLAG_WU);
  USART_ClearITPendingBit(USART1,USART_IT_WU);
}

  if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET){
  GPIO_SetBits(GPIOB,GPIO_Pin_3);
  USART_ReceiveData(USART1);
  //fifo_queue_put(&usart_rx_q[0],USART_ReceiveData(USART1));
  }
  if(USART_GetITStatus(USART1, USART_IT_TC) != RESET){   
  //uint8_t c;
  //if(fifo_queue_get(&usart_tx_q[0],&c)){
  // USART_SendData(USART1,c);
  //}
  //else {
  // fifo_queue_reset(&usart_tx_q[0],(void*)0,0);
  //}
  }
}

主程序如下：
#include "MyFC.h"
int main(void)
{
board_init();
  uint8_t c = 1;
while(1){
  GPIO_SetBits(GPIOB,GPIO_Pin_3);
  Delay_us(1000000);
  //Serial_Write(&Serial2, c);
  USART_SendData(USART2,c);
    GPIO_ResetBits(GPIOB,GPIO_Pin_3);
  Delay_us(1000000);
}
}

SysTick相关的代码如下：
void SysTick_Handler(void){
sysTickUptime++;
}
uint32_t Millis(void){
return sysTickUptime;
}
uint32_t Micros(void){
  register uint32_t ms, cycle_cnt;
  do {
    ms = sysTickUptime;
    cycle_cnt = SysTick->VAL;
    __ASM(" nop ");
  } while (ms != sysTickUptime);
  return (ms * 1000) + (usTicks * 1000 - cycle_cnt) / usTicks;
}
void Delay_us(uint32_t us){
  uint32_t now = Micros();
  while (Micros() - now < us);
}

问题主要特点如下：
1）在注释掉NVIC_Init（）后板子LED灯亮一秒，灭一秒，串口监视器每两秒收到一个字节；
2）把NVIC_Init（）开启后，板子没有任何反应
3）曾经刷过CubeMX生成的代码，串口中断模式是可以正常运行的
4）启动文件用过两个：标准库自带的startup_stm32f334x8.s和cube库自带的startup_stm32f303x8.s，1）和2）的结果都一样

刚开始学习STM32编程，实在弄不明白问题所在，不知如何解决，期待高人出手帮扶，先谢了！