STM32的定时器1上电偶尔不输出PWM

只看该作者 · 2023-10-23 13:34

调试定时器1的通道1输出PWM波形，发现断电重启时偶尔无PWM输出，而且烧写程序自动运行时，占空比控制也是反的。
搜索网上的经验，发现是我的初始化有问题，TIM1是高级定时器，功能多样，初始时没有正确初始，就会出现莫名其妙的问题

TIM_OCInitTypeDef                TIM_OCInitStruct;
TIM_OCInitStruct.TIM_OCMode    = TIM_OCMode_PWM2;          //脉冲宽度调制模式1
//输出极性
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;    //输出极性
TIM_OCInitStruct.TIM_OCIdleState  = TIM_OCIdleState_Set;    //在空闲时输出
TIM_OCInitStruct.TIM_OutputState  = TIM_OutputState_Enable; //PWM输出使能(正向通道)
TIM_OCInitStruct.TIM_OutputNState = TIM_OutputNState_Disable;  //PWM输出失能(互补通道)
TIM_OCInitStruct.TIM_OCNPolarity  = TIM_OCNPolarity_High; //必须
TIM_OCInitStruct.TIM_OCNIdleState = TIM_OCIdleState_Reset;  //必须
TIM_OCInitStruct.TIM_Pulse       = 0;                      //捕获比较的脉冲值
TIM_OC1Init(TIM1,&TIM_OCInitStruct);