stm32f103发PWM遇到问题，求帮助

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csyou_kiko 提问时间：2013-5-8 11:18 /

用一个TIM发相位相差180度、占空比小于50%的两路PWM用于驱动推挽变换器，但是每次复位之后都会有一个脉冲，不知道是怎么来的。如图

这个是软启动时的

还有启动时没有开TIM时的波形

我的配置如下

void TIM4_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TBInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
uint16_t PrescalerValue = 0;
PrescalerValue = (uint16_t) (SystemCoreClock / 24000000) - 1;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_TBInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TBInitStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1;
TIM_TBInitStructure.TIM_Period = 1200; //10kHz Equal to 20kHz for push-pull
TIM_TBInitStructure.TIM_Prescaler = PrescalerValue;
TIM_TBInitStructure.TIM_RepetitionCounter = 1;
TIM_TimeBaseInit(TIM4, &TIM_TBInitStructure);
TIM_PrescalerConfig(TIM4, PrescalerValue, TIM_PSCReloadMode_Immediate);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_Pulse = 60;
TIM_OC3Init(TIM4, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_Pulse = 1140;
TIM_OC4Init(TIM4, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM4, ENABLE);
TIM_SetCounter(TIM4, 600);
TIM_ClearFlag(TIM4, TIM_FLAG_CC3| TIM_FLAG_CC4);

TIM_ITConfig(TIM4, TIM_IT_CC4, ENABLE);
TIM_Cmd(TIM4, ENABLE);
}
是配置有问题么？怎么才能解决呢？谢谢各位啦！