[mw_shl_code=c,true]        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable; //比较输出 TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性高 // TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set; TIM_OC2Init(TIM8, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx TIM_OC2PreloadConfig(TIM8, TIM_OCPreload_Enable); //CH1预装载使能 TIM_OC3Init(TIM8, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx TIM_OC3PreloadConfig(TIM8, TIM_OCPreload_Enable); //CH1预装载使能 [/mw_shl_code] 如果我屏蔽
[mw_shl_code=c,true] TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性高[/mw_shl_code] 这一句的话，CH2就有PWM输出
如果不屏蔽，CH2就置低位，这是为什么?