定时器中断运行不了，无论怎么写，总是会在最后一步卡住

青水之牧

今天发现一个很奇怪的问题，在写定时器中断的时候，发现无论怎么写，总是会在最后一步卡住。例如下面的代码，就会卡在NVIC_Init函数里面的最后一步NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =(uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);如果把TIM_ITConfig函数放在最后，就会卡在TIM_ITConfig函数，好奇怪啊，求大神解答


        TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
       
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);  ///使能TIM3时钟
       
        TIM_TimeBaseInitStructure.TIM_Period = arr;         //自动重装载值
        TIM_TimeBaseInitStructure.TIM_Prescaler=psc;  //定时器分频
        TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
        TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
       
        TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);//初始化TIM3
       
        TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //允许定时器3更新中断
        TIM_Cmd(TIM3,ENABLE); //使能定时器3
       
        NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn; //定时器3中断
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01; //抢占优先级1
        NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x03; //子优先级3
        NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
        NVIC_Init(&NVIC_InitStructure);

温良9577

RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM3,ENABLE );      //打开TIM3的工作时钟系统//APB2总线频率64MHZ
  TIM_TimeBaseStructure.TIM_Period =200 ;                  //自动装载
  TIM_TimeBaseStructure.TIM_Prescaler =TIM3psc;                   //64M分频率到2MHZ
  TIM_TimeBaseStructure.TIM_ClockDivision =0 ;                                 //
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);            //
  
  NVIC_InitStructure.NVIC_IRQChannel =  TIM3_IRQn ;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority =1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
        TIM_ARRPreloadConfig(TIM3,ENABLE);                         // 允许自动装载功能   
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
  TIM_Cmd(TIM2, DISABLE);

dianyan

把使能放最后