原子哥，求助定时器2，定时值重新加载的问题

rokin · 发表于 2014-7-30 15:15:08

原子哥，请问一下，我想用定时器2定时，然后在中断中更新定时的值。该怎么配置?
我下面的配置是不是有问题？我通过调试发现定时器的值并没有更新,一直是初始化的值.

void Timer2_Init(void)
{
    TIM_TimeBaseInitTypeDef Tim_TimeBaseInitStruct;

    TIM_DeInit(TIM2);
    Tim_TimeBaseInitStruct.TIM_Period = 1000-1;
    Tim_TimeBaseInitStruct.TIM_Prescaler = 71;
    Tim_TimeBaseInitStruct.TIM_ClockDivision = 0;
    Tim_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    Tim_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
    TIM_TimeBaseInit(TIM2, & Tim_TimeBaseInitStruct);

    TIM_ARRPreloadConfig(TIM2, ENABLE); //ENABLE// DISABLE

    TIM_ClearFlag(TIM2,TIM_FLAG_Update);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM2,ENABLE);
}

void TIM2_IRQHandler(void)
{
static unsigned count =0;
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update );
        TIM2->ARR=TimeValue[count];
      count++;
      if(count>=32)
      {
            count=0;
        }
}
}