求助，关于STM32F407的定时器中断问题！！

易方亮 · 发表于 2019-2-26 10:50:27

      求助各位大佬，最近在调一块板子，芯片是STM32F407VGT，在调试TIM3中断的时候出现问题，仅仅是想定时通过串口输出东西，串口能调通，普通定时功能也正常，就是打开定时中断之后程序卡死了，仿真发现程序会跑到0x00000000，点run就一点点爬，请问各位大佬这是什么问题？
代码如下：
定时器初始化：
void TIM3_init(void)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);  ///ê1ÄüTIM3ê±Öó APB1 = 42MHZ  TIM3 = APB1*2 = 84Mhz

TIM_DeInit(TIM3);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Prescaler = 8400-1;
TIM_TimeBaseStructure.TIM_Period = 19999;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//ÏòéÏ¼Çêy
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

WF_NVIC_Set(TIM3_IRQn,1,1,ENABLE);
TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE );
TIM_SetCounter(TIM3, 0);

TIM_Cmd(TIM3, ENABLE);
}

void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3,TIM_IT_Update)==SET)
{
printf("11111111r\\n");
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
}
}