stm32高级定时器产生互补的占空比不同的波形，但会有毛刺

只看该作者 · 2011-11-2 15:34

TIM1_TimeBaseStructure.TIM_Prescaler =71;
  TIM1_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM1_TimeBaseStructure.TIM_Period = 1999;
  TIM1_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM1_TimeBaseStructure.TIM_RepetitionCounter = 0x0;

  TIM_TimeBaseInit(TIM1,&TIM1_TimeBaseStructure);

  /* Channel 1, 2,3 and 4 Configuration in PWM mode */
  TIM1_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
  TIM1_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM1_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM1_OCInitStructure.TIM_Pulse = CCR1_Val;
  TIM1_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM1_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
  TIM1_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM1_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

  TIM_OC1Init(TIM1,&TIM1_OCInitStructure);

  /* Automatic Output enable, Break, dead time and lock configuration*/
  TIM1_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
  TIM1_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
  TIM1_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
  TIM1_BDTRInitStructure.TIM_DeadTime = 0x75;
  TIM1_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
  TIM1_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
  TIM1_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;

  TIM_BDTRConfig(TIM1,&TIM1_BDTRInitStructure);

  /* TIM1 counter enable */
  TIM_Cmd(TIM1,DISABLE);

  /* Main Output Enable */
  TIM_CtrlPWMOutputs(TIM1,DISABLE);
  TIM_ARRPreloadConfig(TIM1, ENABLE);
  while(1)
  {
TIM_Cmd(TIM1,DISABLE);

CCR1_Val=VAL[0];
TIM1_OCInitStructure.TIM_Pulse = CCR1_Val;

TIM_OC1Init(TIM1,&TIM1_OCInitStructure);
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
   Delay(2);
      TIM_Cmd(TIM1,DISABLE);

CCR1_Val=VAL[1];
TIM1_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OC1Init(TIM1,&TIM1_OCInitStructure);
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
   Delay(2);
TIM_Cmd(TIM1,DISABLE);

CCR1_Val=VAL[2];
TIM1_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OC1Init(TIM1,&TIM1_OCInitStructure);
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
    Delay(2);
TIM_Cmd(TIM1,DISABLE);

CCR1_Val=VAL[3];
TIM1_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OC1Init(TIM1,&TIM1_OCInitStructure);
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
    Delay(2);
TIM_Cmd(TIM1,DISABLE);

CCR1_Val=VAL[4];
TIM1_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OC1Init(TIM1,&TIM1_OCInitStructure);
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
    Delay(2);
TIM_Cmd(TIM1,DISABLE);

  }
u16 VAL[5]={500,800,1000,1500,1600};

1万 · 2011-11-2 16:07

不知道你这么毛刺是什么样子的? 能不能描述清楚一些, 正常情况不是应该的.

1万 · 2011-11-2 16:29

什么样的毛刺？在哪里？什么时候出现？

只看该作者 · 2011-11-3 09:58

就是在运行完第一个数组，delay（2）后，运行下一数组之前会有一个小毛刺，每次都在两个连接处有毛刺 2# airwill

只看该作者 · 2011-11-3 10:00

3# 香水城

就是在运行完第一个数组，delay（2）后，运行下一数组之前会有一个小毛刺，每次都在两个连接处有毛刺 2# airwill

只看该作者 · 2011-11-3 10:01

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只看该作者 · 2011-11-3 10:01

只看该作者 · 2011-11-3 10:03

5# xiongxingzhi
上面第二个波形粗的那一小段，下面的那个图我放大之后出现的一个毛刺。。。。

1万 · 2011-11-3 10:17

抱歉, 没有细看你的程序, 看样子是 TIM_Cmd(TIM1,DISABLE); 导致的.
要想 PWM 正常工作, 不能中途关闭定时器.
其实后面, 你只要 TIM1->CCR1 = CCR1_Val;  就行了.
不需要
TIM1_OCInitStructure.TIM_Pulse = CCR1_Val;

      TIM_OC1Init(TIM1,&TIM1_OCInitStructure);
            TIM_Cmd(TIM1,ENABLE);
            TIM_CtrlPWMOutputs(TIM1,ENABLE);

另外, 你用 delay(2) 方式来等待更换 CCR 的时间也不好.
可以使用 CCR 影子锁存特性. 这样当你改变了 CCR 寄存器, 会等发生更新事件后, 你写于 CCR 寄存器的值才真正起作用.