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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