占空比的疑惑

只看该作者 · 2013-4-19 19:53

stm32中定时器占空比=Pulse/Period，速度与占空比成正比。在Periode不变的情况下，应该Pulse值越大，速度越大；可是我的却是Pulse越小，速度越大，请问是为什么，非常感谢！

TIM_TimeBaseStructure.TIM_Prescaler = 3 - 1;    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned2 TIM_TimeBaseStructure.TIM_Period = 750-1;    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;    TIM_OCInitStructure.TIM_OutputState  = TIM_OutputState_Disable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStructure.TIM_Pulse = 5；
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    TIM_OCInitStructure.TIM_OCNPolarity  = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState  = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1,&TIM_OCInitStructure);