我有个问题想请教下，我用STM32F103C8T6芯片的time1定时器的OC2,OC4产生两路占空比可调的PWM方波，用它来驱动H桥芯片，现在的问题是，程序运行过程中，出现了PWM方波输出停止了，不输出了，不知道是什么原因
void PWM_init(void)
{                
          TIM_TimeBaseStructure.TIM_Prescaler = 0x1;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseStructure.TIM_Period = 16000;        
          TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;              
        TIM_TimeBaseStructure.TIM_RepetitionCounter=0X00;
          TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

        TIM_OCInitTypeStructure.TIM_OCMode=TIM_OCMode_PWM2;
        TIM_OCInitTypeStructure.TIM_OutputState=TIM_OutputState_Enable;
        TIM_OCInitTypeStructure.TIM_OutputNState=TIM_OutputNState_Disable;
        TIM_OCInitTypeStructure.TIM_Pulse=0;
        TIM_OCInitTypeStructure.TIM_OCPolarity=TIM_OCPolarity_Low;

       
        TIM_OC2Init(TIM1,&TIM_OCInitTypeStructure);        
        TIM_OCInitTypeStructure.TIM_Pulse=0;

        TIM_OC4Init(TIM1,&TIM_OCInitTypeStructure);

        TIM_Cmd (TIM1,ENABLE);
        TIM_CtrlPWMOutputs(TIM1, ENABLE);

}




void PWM_SET_L(uint32_t j)
{
        TIM_OCInitTypeStructure.TIM_Pulse=0;
        TIM_OC2Init(TIM1,&TIM_OCInitTypeStructure);
        delay(10);
        TIM_OCInitTypeStructure.TIM_Pulse=j;
        TIM_OC4Init(TIM1,&TIM_OCInitTypeStructure);
        TIM_Cmd (TIM1,ENABLE);
        TIM_CtrlPWMOutputs(TIM1, ENABLE);
}


void PWM_SET_H(uint32_t j)
{
        TIM_OCInitTypeStructure.TIM_Pulse=0;
        TIM_OC4Init(TIM1,&TIM_OCInitTypeStructure);
        delay(10);
        TIM_OCInitTypeStructure.TIM_Pulse=j;
        TIM_OC2Init(TIM1,&TIM_OCInitTypeStructure);       
        TIM_Cmd (TIM1,ENABLE);
        TIM_CtrlPWMOutputs(TIM1, ENABLE);
}