stm32f407 TIM1 CH1通道无法产生pwm波形

guanchunyu · 发表于 2019-3-10 14:14:04

  按照下面代码配置定时器1，其他通道都可以产生pwm波，只有PE9(1通道不能产生正常波形)，请大神帮帮忙

      GPIO_InitTypeDef GPIO_InitStructure;                //GPIO基本结构 TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;    //定时器基本结构
TIM_OCInitTypeDef  TIM_OCInitStructure;             //OC: Output Compare 输出比较和PWM

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);    //TIM1时钟使能    注意此处是APB2
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE); //使能PORTE时钟

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_9 | GPIO_Pin_13;          //GPIOE9
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;       //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;    //推挽复用输出
// GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;       //上拉
GPIO_Init(GPIOE,&GPIO_InitStructure);             //初始化PE9

      GPIO_PinAFConfig(GPIOE,GPIO_PinSource9,GPIO_AF_TIM1); //GPIOE9复用为定时器1
GPIO_PinAFConfig(GPIOE,GPIO_PinSource13,GPIO_AF_TIM1); //GPIOE14复用为定时器1

TIM_TimeBaseStructure.TIM_Prescaler=psc;  //定时器分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_Period=arr; //自动重装载值
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;

TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);//初始化定时器1

//初始化TIM1 Channel1 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性低

      TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
      TIM_OCInitStructure.TIM_Pulse = 250;

TIM_OC3Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1OC1
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1在CCR1上的预装载寄存器

      TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1OC1
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1在CCR1上的预装载寄存器

      TIM_ARRPreloadConfig(TIM1,ENABLE);//ARPE使能

TIM_Cmd(TIM1, ENABLE);  //使能TIM1

      TIM_CtrlPWMOutputs(TIM1, ENABLE);