各位大神帮我看看为什么不能产生PWM呗

a7600241

定时器4通道1，通道2，PB6，PB7引脚，这样配置用keil5软件仿真也没有波形，一样的配置用定时器3的3,4通道就会有波形，这是为啥？




GPIO_InitTypeDef GPIO_InitStructure;
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;
       
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);  //使能GPIO外设和AFIO复用功能模块时钟
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);        //使能定时器4时钟
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);        
       
       
       
        //TIM4通道1通道2复用推挽输出
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
       
        // Time base configuration  
        TIM_TimeBaseStructure.TIM_Period = 4096;
        TIM_TimeBaseStructure.TIM_Prescaler = 4;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
        TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
        TIM_ARRPreloadConfig(TIM4, ENABLE);
       
    //TIM4_OC1模块设置（设置1通道占空比）
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
        TIM_OCInitStructure.TIM_Pulse =2020;
        TIM_OC1Init(TIM4, &TIM_OCInitStructure);
        TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);


    //TIM4_OC2模块设置（设置2通道占空比）
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
        TIM_OCInitStructure.TIM_Pulse =2020;
        TIM_OC2Init(TIM4, &TIM_OCInitStructure);
        TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);


        // TIM4 enable counter
        TIM_Cmd(TIM4, ENABLE);
  TIM_CtrlPWMOutputs(TIM4,ENABLE ) ;

a7600241

解决了，不是这里的问题，后面还有个引脚配置把这两个初始化了，原理图改了，灯位置变了，我自己没注意