配置定时器3中断以后,SYSTICK延时不起作用

snailmoving · 发表于 2016-4-7 08:44:25

本帖最后由 snailmoving 于 2016-4-7 09:52 编辑

如题
配置定时器3中断以后,SYSTICK延时不起作用

延时函数用的是原子原版的
定时器3配置如下：
void TIM3_Conifg(uint8_t num_t)
{
      TIM_TimeBaseInitTypeDef TimeBaseInstructure;
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

      TIM_DeInit(TIM3);
      TimeBaseInstructure.TIM_Period = 10*num_t;
      TimeBaseInstructure.TIM_Prescaler = 7200;
      TimeBaseInstructure.TIM_ClockDivision = 0;
      TimeBaseInstructure.TIM_CounterMode = TIM_CounterMode_Up;

      TIM_TimeBaseInit(TIM3,&TimeBaseInstructure);
      TIM_ClearFlag(TIM3,TIM_FLAG_Update);
      TIM_Cmd(TIM3,ENABLE);
      TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
}

定时器3中断代码如下：
void TIM3_IRQHandler(void)
{
      if(TIM_GetITStatus(TIM3,TIM_IT_Update) == SET)
      {
            screen_scan(sc1,sc2,sc3,sc4);             delay_ms(5);
            TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
      }
}

求大神帮忙