ST意法半导体中文论坛如何用STM32产生相位差180度，且占空比可调的两路PWM

如何用STM32产生相位差180度，且占空比可调的两路PWM

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tonghua 提问时间：2016-3-25 16:07 /

问答
是否解决:

最近需要用到两路相位差180度，且占空比可调的PWM，看到论坛上说用输出比较模式，但输出比较模式只能产生一定相位差且占空比固定的PWM，求助

赞收藏评论2 发布时间：2016-3-25 16:07

2个回答

tonghua 回答时间：2016-3-25 16:29:08

自己顶起来

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shuolang 回答时间：2016-3-26 06:46:40

使用TIM1的反相输出功能，具体你可以看官方例程，大概代码如下：

//TIM1做PWM输出
void Tim1_Config(void)
{
  TimerPeriod =  (SystemCoreClock / 20000 ) - 1;
  ccr1 = TimerPeriod / 2;  //占空比1/2 = 50%
  ccr2 = TimerPeriod / 3;  //占空比1/3 = 33%
  ccr3 = TimerPeriod / 4;  //占空比1/4 = 25%

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
  //时基初始化
  TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1; //死区控制用。
  TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;  //计数器方向
  TIM_TimeBaseInitStructure.TIM_Prescaler = 0; //Timer clock = sysclock /(TIM_Prescaler+1) = 168M
  TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInitStructure.TIM_Period = TimerPeriod - 1;
  TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStructure);

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_Pulse = ccr1;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;

  TIM_OC1Init(TIM1,&TIM_OCInitStructure);

  TIM_Cmd(TIM1,ENABLE);
  TIM_CtrlPWMOutputs(TIM1,ENABLE);
}

例如使用OC1/OC1N两个通道输出反向信号如下，是否你要的效果？