关于STM32F051比较器与定时器的逐波电流控制问题！

q350182617

手册里讲STM32F051内部比较器可以连接到定时器的OCREF_CLR输入，可是怎么配置就是实现不了内部连接（外部连接已实现逐周期电流控制），有没有高手用到这个东西，指点下什么情况， </b>
定时器配置
/******************************************************
    TIM1_Config
*******************************************************/
 
  /* TIM1 clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE); 
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 , ENABLE);
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);

  /* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 999;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = 47999;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
  /* Channel 1, 2, 3 and 4 Configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
  TIM_OCInitStructure.TIM_Pulse = 1000;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
  TIM_OCInitStructure.TIM_Pulse = 100;
  TIM_OC2Init(TIM1, &TIM_OCInitStructure);
  TIM_OCInitStructure.TIM_Pulse = 100;
  TIM_OC3Init(TIM1, &TIM_OCInitStructure);

  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
//  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
//  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  TIM_OCInitStructure.TIM_Pulse = 1000;   
  TIM_OC4Init(TIM1, &TIM_OCInitStructure);
 
//  TIM1->CCER = 0x3FF6;
  /* Time BDTR configuration */
  TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
  TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
  TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
  TIM_BDTRInitStructure.TIM_DeadTime  = 0x00;
  TIM_BDTRInitStructure.TIM_Break     = TIM_Break_Enable;
  TIM_BDTRInitStructure.TIM_BreakPolarity   =  TIM_BreakPolarity_Low;
  TIM_BDTRInitStructure.TIM_AutomaticOutput =  TIM_AutomaticOutput_Enable;
                
  TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);
//  TIM_ClearFlag(TIM1, TIM_IT_Update);
//  TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);
 
  TIM_ETRConfig(TIM1, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_Inverted, 0x00);
  TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Disable);
  TIM_SelectOCREFClear(TIM1, TIM_OCReferenceClear_OCREFCLR);
  TIM_ClearOC1Ref(TIM1, TIM_OCClear_Disable); 
  /* TIM1 counter enable */
  TIM_Cmd(TIM1, ENABLE);
  /* TIM1 Main Output Enable */
  TIM_CtrlPWMOutputs(TIM1, ENABLE);
比较器配置

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  COMP_DeInit();
   
  COMP_InitStructure.COMP_InvertingInput = COMP_InvertingInput_DAC1;   
  COMP_InitStructure.COMP_Output = COMP_Output_TIM1OCREFCLR;    
  COMP_InitStructure.COMP_OutputPol = COMP_OutputPol_NonInverted;  
  COMP_InitStructure.COMP_Hysteresis = COMP_Hysteresis_No;   
 COMP_InitStructure.COMP_Mode = COMP_Mode_HighSpeed;       
COMP_Init(COMP_Selection_COMP1, &COMP_InitStructure);
  COMP_Cmd(COMP_Selection_COMP1, ENABLE);

zykzyk-93033

能不能提供工程看看。

q350182617

发个外部已经实现的工程，还有波形图片。
黄色的通道是比较器同相端输入可调电位器，紫色为比较器反相端输入DAC模拟的锯齿波，蓝色为控制后PWM波形。
比较器输出端PA6直连到定时器1ETR端PA12

lql2009

高手啊

jackliu-417543

学习学习！！！！

stary666

学习，还没用过

数码小叶

不懂。帮顶

数码小叶

随便学习学习

adeweilive

我也遇到同样的问题，请问解决了吗？

dzzwoaizi

楼主看着利用高级定时器是要做BLDC电机控制还是？