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

1. TIM_InitStruct.Prescaler = Prescaler;
   
2.   TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP;
   
3.   TIM_InitStruct.Autoreload = Period;
   
4.   TIM_InitStruct.ClockDivision = LL_TIM_CLOCKDIVISION_DIV1;
   
5.   TIM_InitStruct.RepetitionCounter = 2;
   
6.   LL_TIM_Init(TIM1, &TIM_InitStruct);
   
7.   LL_TIM_EnableARRPreload(TIM1);
   
8.   LL_TIM_OC_EnablePreload(TIM1, LL_TIM_CHANNEL_CH1);
   
9.   TIM_OC_InitStruct.OCMode = LL_TIM_OCMODE_PWM1;
   
10.   TIM_OC_InitStruct.OCState = LL_TIM_OCSTATE_DISABLE;
    
11.   TIM_OC_InitStruct.OCNState = LL_TIM_OCSTATE_DISABLE;
    
12.   TIM_OC_InitStruct.CompareValue = Pulse;
    
13.   TIM_OC_InitStruct.OCPolarity = LL_TIM_OCPOLARITY_HIGH;//LL_TIM_OCPOLARITY_LOW;//
    
14.   TIM_OC_InitStruct.OCNPolarity = LL_TIM_OCPOLARITY_HIGH;
    
15.   TIM_OC_InitStruct.OCIdleState = LL_TIM_OCIDLESTATE_LOW;
    
16.   TIM_OC_InitStruct.OCNIdleState = LL_TIM_OCIDLESTATE_LOW;
    
17.   LL_TIM_OC_Init(TIM1, LL_TIM_CHANNEL_CH1, &TIM_OC_InitStruct);
    
18.   LL_TIM_OC_DisableFast(TIM1, LL_TIM_CHANNEL_CH1);
    
19. //  TIM_InitStruct.Autoreload = Period;
    
20.   LL_TIM_SetOnePulseMode(TIM1, LL_TIM_ONEPULSEMODE_SINGLE);
    
21.   LL_TIM_SetTriggerOutput(TIM1, LL_TIM_TRGO_RESET);
    
22.   LL_TIM_SetTriggerOutput2(TIM1, LL_TIM_TRGO2_RESET);
    
23.   LL_TIM_DisableMasterSlaveMode(TIM1);
    
24.   TIM_BDTRInitStruct.OSSRState = LL_TIM_OSSR_DISABLE;
    
25.   TIM_BDTRInitStruct.OSSIState = LL_TIM_OSSI_DISABLE;//LL_TIM_OSSI_ENABLE;//
    
26.   TIM_BDTRInitStruct.LockLevel = LL_TIM_LOCKLEVEL_OFF;
    
27.   TIM_BDTRInitStruct.DeadTime = 0;
    
28.   TIM_BDTRInitStruct.BreakState = LL_TIM_BREAK_DISABLE;
    
29.   TIM_BDTRInitStruct.BreakPolarity = LL_TIM_BREAK_POLARITY_HIGH;
    
30.   TIM_BDTRInitStruct.BreakFilter = LL_TIM_BREAK_FILTER_FDIV1;
    
31.   TIM_BDTRInitStruct.BreakAFMode = LL_TIM_BREAK_AFMODE_INPUT;
    
32.   TIM_BDTRInitStruct.Break2State = LL_TIM_BREAK2_DISABLE;
    
33.   TIM_BDTRInitStruct.Break2Polarity = LL_TIM_BREAK2_POLARITY_HIGH;
    
34.   TIM_BDTRInitStruct.Break2Filter = LL_TIM_BREAK2_FILTER_FDIV1;
    
35.   TIM_BDTRInitStruct.Break2AFMode = LL_TIM_BREAK_AFMODE_INPUT;
    
36.   TIM_BDTRInitStruct.AutomaticOutput = LL_TIM_AUTOMATICOUTPUT_ENABLE;
    
37.   LL_TIM_BDTR_Init(TIM1, &TIM_BDTRInitStruct);

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波形图

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。


这里有篇文章 《STM32定时器单脉冲输出模式话题》 非常详细地针对性介绍了STM32TIMER单脉


冲模式的实现原理，并辅以事例讲解，可以阅读下。希望读完之后消除你现在内心的疑惑。