STM32F103 定时器

rokin · 发表于 2014-7-30 14:04:59

请大家帮我看看STM32定时器2的设置有什么问题？我是用定时器2实现定时功能，然后在中断中重新加载新的定时值，为什么加载的值没有起作用，加载的值一直是初始化的值.
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);
    TIM_ClearFlag(TIM2,TIM_FLAG_Update);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM2,ENABLE);
}

void TIM2_IRQHandler(void)
{
static unsigned char i=0;
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update );
        Tim_TimeBaseInitStruct.TIM_Period = TimeValue;
      i++;
      if(i>=32)
      {
          i=0;
        }
}
}