STM32F0 系列用定时器产生10MS方波，但是方波不稳定有波动

核子霹雳 · 发表于 2018-4-28 11:21:18

本帖最后由核子霹雳于 2018-4-28 11:24 编辑

#define TIME3_CCR1_Val                60

void Time_Configuration(FunctionalState enable)
{
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef  TIM_OCInitStructure;
      uint16_t PrescalerValue;
      /* Compute the prescaler value */
      PrescalerValue = (uint16_t) (SystemCoreClock  / 6000) - 1;

      /* Time base configuration */
      TIM_TimeBaseStructure.TIM_Period = 65535;
      TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
      TIM_TimeBaseStructure.TIM_ClockDivision = 0;
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

      TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

      /* Output Compare Toggle Mode configuration: Channel1 */
      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_Pulse = TIME3_CCR1_Val;
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
      TIM_OC1Init(TIM3, &TIM_OCInitStructure);

      TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable);



      /* TIM enable counter */
      TIM_Cmd(TIM3, enable);

      /* TIM IT enable */
      TIM_ITConfig(TIM3, TIM_IT_CC1, enable);
}
//放在定时器中断里面TIM3_IRQHandler
void STM32_TIM3_IRQHandler(void)
{
      u32 capture;

      if (TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET)
            {
            TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);

            capture = TIM_GetCapture1(TIM3);
            TIM_SetCompare1(TIM3, capture + TIME3_CCR1_Val);

                     if(BitFalg==0)
                     {
                              BitFalg =1;
                              P_Led2_OUT_HI
                     }
                     else if(BitFalg==1)
                     {
                              BitFalg =0;
                              P_Led2_OUT_LO

                     }
            }
}
产生10MS 方波  但是方波不稳定，中间会夹杂其他方波如图红色框表示，用的是 STM3F0 内部高速时钟8M。    什么原因会照成这样的结果？  和用的内部时钟有关系吗？请大神指教。