TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;
TIM_BaseInitStructure.TIM_Prescaler = 2-1;
TIM_BaseInitStructure.TIM_Period = 1500-1;
TIM_BaseInitStructure.TIM_ClockDivision = 0;
TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_BaseInitStructure);
如果使用上面的設置，產生100%占空比的PWM，參數TIM1_OCInitStructure.TIM_Pulse應該設置1500還是1499
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