通过EXIT按键调节PWM的占空比

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楼主

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楼主 | 2019-11-27 18:06 | 只看该作者回帖奖励

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PWM, TI, ST, structure, struct

想用EXIT按键功能调节PWM的占空比，定时周期为1000，占空比有500,250，但按下按键由500变250时，输出的方波是这样的 ___|￣|_|￣|___,并不是我想要的占空比为250的方波

void TIM3_Mode_Config(int pulse)
{
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef  TIM_OCInitStructure;

      u16 t[] = {500,250};


      /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 999;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  /* PWM1 Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = t[0];

  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC1Init(TIM3, &TIM_OCInitStructure);
  TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

      TIM_ARRPreloadConfig(TIM3, ENABLE);


      /* TIM3 enable counter */
  TIM_Cmd(TIM3, ENABLE);
}

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