6路pwm 互补控制blcd 输出异常！

只看该作者 · 2019-7-13 17:01

大家好！我用32 tim1 6路pwm 互补控制blcd 现在遇到一个问题就是  重复调用
TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1); //pwm1
  TIM_SetCompare2(TIM1, 0);                                                    //占空比0
  TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Enable);          //chN通道 0
  TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Enable);          //  ch通道 1
这个语句波形输出就不正常，会有异常下降沿

代码是
  TIM_TimeBaseStructure.TIM_Prescaler = 0;                   //预分频
  TIM_TimeBaseStructure.TIM_CounterMode =TIM_CounterMode_CenterAligned1 ;    //  模式  增 ;//中央对齐模式 1 计数模式
  TIM_TimeBaseStructure.TIM_Period = 5999;                   //  从装比较最大 12k  = 72000/ 6000= 12k
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;                //  分频
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0;                            //  控制占空比

  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High ;       //  上桥臂
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High ;       //  下桥臂

  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set;

  TIM_OC1Init(TIM1, &TIM_OCInitStructure);                      //  比较单元 1 2 3
  TIM_OC2Init(TIM1, &TIM_OCInitStructure);
  TIM_OC3Init(TIM1, &TIM_OCInitStructure);

  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);             //
  TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
  TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);

  TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
  TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
  TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
  // The DeadTime=8(32+DTG[4:0])Tdts DTG= C4
  TIM_BDTRInitStructure.TIM_DeadTime = 0x6A; //  带死区 1.8us左右

// TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;

  TIM_BDTRInitStructure.TIM_Break =TIM_Break_Disable ;  //  关闭刹车
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;//低电平输入有效
  TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
  TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

TIM_ClearITPendingBit(TIM1, TIM_IT_Break);  //清中断标志位
TIM_ITConfig(TIM1,TIM_IT_Break ,ENABLE); //使能中断

TIM_ClearFlag(TIM1, TIM_FLAG_Update);
TIM_ClearITPendingBit(TIM1, TIM_IT_Update);  //清中断标志位
TIM_ITConfig(TIM1,TIM_IT_Update ,ENABLE); //打开中断

  TIM_Cmd(TIM1, DISABLE);//使能或者失能TIMx外设
TIM_CtrlPWMOutputs(TIM1, DISABLE); //使能或者失能主输出