如何解决STM32普通定时器配置PWM的问题

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oid TIM3_Init(void){    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;      TIM_OCInitTypeDef  TIM_OCInitStructure;      /* PWM信号电平跳变值 */  //    u16 CCR1= 36000;          //    u16 CCR2= 36000;      /*PCLK1经过2倍频后作为TIM3的时钟源等于72MHz*/      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);      /* Time base configuration */                                                TIM_TimeBaseStructure.TIM_Period =1599;                                     //计数周期1600    TIM_TimeBaseStructure.TIM_Prescaler = 1;                                    //设置预分频：预分频=2，即为72/3=24MHz      TIM_TimeBaseStructure.TIM_ClockDivision = 0;                                //设置时钟分频系数：不分频      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;                 //向上计数溢出模式      TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);      /* PWM1 Mode configuration: Channel1 */      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;                           //配置为PWM模式1      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;                    TIM_OCInitStructure.TIM_Pulse =600;                                       //设置跳变值，当计数器计数到这个值时，电平发生跳变      TIM_OCInitStructure.TIM_OCPolarity =TIM_OCPolarity_Low;                    //当定时器计数值小于CCR1时为高电平      TIM_OC1Init(TIM3, &TIM_OCInitStructure);                                    //使能通道1          TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);      /* PWM1 Mode configuration: Channel2 */      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;      TIM_OCInitStructure.TIM_Pulse = 300;                                       //设置通道2的电平跳变值，输出另外一个占空比的PWM      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;                    //当定时器计数值小于CCR2时为低电平     TIM_OC2Init(TIM3, &TIM_OCInitStructure);                                    //使能通道2      TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);      TIM_ARRPreloadConfig(TIM3, ENABLE);                                         //使能TIM3重载寄存器ARR      /* TIM3 enable counter */      TIM_Cmd(TIM3, ENABLE);     Delay_8ms();    TIM_Cmd(TIM3, DISABLE); }

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