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STM32G070使用PWM1功能结合单脉冲模式输出任意个数脉冲，为什么不是低电平？

使用PWM1功能结合单脉冲模式输出任意个数脉冲，比如输出3个脉冲，最后电平是高，为什么不是低电平？OCIdleState并不起作用，可以修改配置成低电平吗？下面是代码配置

  • tiM_InitStruct.Prescaler = Prescaler;
  •   TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP;
  •   TIM_InitStruct.Autoreload = Period;
  •   TIM_InitStruct.ClockDivision = LL_TIM_CLOCKDIVISION_DIV1;
  •   TIM_InitStruct.RepetitionCounter = 2;
  •   LL_TIM_Init(TIM1,  TIM_InitStruct);
  •   LL_TIM_EnableARRPreload(TIM1);
  •   LL_TIM_OC_EnablePreload(TIM1, LL_TIM_CHANNEL_CH1);
  •   TIM_OC_InitStruct.OCMode = LL_TIM_OCMODE_PWM1;
  •   TIM_OC_InitStruct.OCState = LL_TIM_OCSTATE_DISABLE;
  •   TIM_OC_InitStruct.OCNState = LL_TIM_OCSTATE_DISABLE;
  •   TIM_OC_InitStruct.CompareValue = Pulse;
  •   TIM_OC_InitStruct.OCPolarity = LL_TIM_OCPOLARITY_HIGH;//LL_TIM_OCPOLARITY_LOW;//
  •   TIM_OC_InitStruct.OCNPolarity = LL_TIM_OCPOLARITY_HIGH;
  •   TIM_OC_InitStruct.OCIdleState = LL_TIM_OCIDLESTATE_LOW;
  •   TIM_OC_InitStruct.OCNIdleState = LL_TIM_OCIDLESTATE_LOW;
  •   LL_TIM_OC_Init(TIM1, LL_TIM_CHANNEL_CH1,  TIM_OC_InitStruct);
  •   LL_TIM_OC_DisableFast(TIM1, LL_TIM_CHANNEL_CH1);
  • //  TIM_InitStruct.Autoreload = Period;
  •   LL_TIM_SetOnePulseMode(TIM1, LL_TIM_ONEPULSEMODE_SINGLE);
  •   LL_TIM_SetTriggerOutput(TIM1, LL_TIM_TRGO_RESET);
  •   LL_TIM_SetTriggerOutput2(TIM1, LL_TIM_TRGO2_RESET);
  •   LL_TIM_DisableMasterSlaveMode(TIM1);
  •   TIM_BDTRInitStruct.OSSRState = LL_TIM_OSSR_DISABLE;
  •   TIM_BDTRInitStruct.OSSIState = LL_TIM_OSSI_DISABLE;//LL_TIM_OSSI_ENABLE;//
  •   TIM_BDTRInitStruct.LockLevel = LL_TIM_LOCKLEVEL_OFF;
  •   TIM_BDTRInitStruct.DeadTime = 0;
  •   TIM_BDTRInitStruct.BreakState = LL_TIM_BREAK_DISABLE;
  •   TIM_BDTRInitStruct.BreakPolarity = LL_TIM_BREAK_POLARITY_HIGH;
  •   TIM_BDTRInitStruct.BreakFilter = LL_TIM_BREAK_FILTER_FDIV1;
  •   TIM_BDTRInitStruct.BreakAFMode = LL_TIM_BREAK_AFMODE_INPUT;
  •   TIM_BDTRInitStruct.Break2State = LL_TIM_BREAK2_DISABLE;
  •   TIM_BDTRInitStruct.Break2Polarity = LL_TIM_BREAK2_POLARITY_HIGH;
  •   TIM_BDTRInitStruct.Break2Filter = LL_TIM_BREAK2_FILTER_FDIV1;
  •   TIM_BDTRInitStruct.Break2AFMode = LL_TIM_BREAK_AFMODE_INPUT;
  •   TIM_BDTRInitStruct.AutomaticOutput = LL_TIM_AUTOMATICOUTPUT_ENABLE;
  •   LL_TIM_BDTR_Init(TIM1,  TIM_BDTRInitStruct);




回帖（1）

袁嫚玲

2024-3-14 14:03:12
你在现有配置下，注意 我说的是你有配置前提下，将PWM输出模式改为PWM2即可。

其实，基于单脉冲模式实现指定个数脉冲输出可以有多种配置。

另外，你提及的OCIdleState并不起作用是正常的，该配置是针对互补输出才有作用。
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