我想要用定时器输出四路PWM驱动舵机，但是发现舵机不转，配置定时器14又可以用。请教一下各位解惑，我这样写问题出在了哪里？...

wangxiaoxiao · 发表于 2018-11-29 21:27:28

GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

GPIO_PinAFConfig(GPIOD,GPIO_PinSource12,GPIO_AF_TIM4);
GPIO_PinAFConfig(GPIOD,GPIO_PinSource13,GPIO_AF_TIM4);
GPIO_PinAFConfig(GPIOD,GPIO_PinSource14,GPIO_AF_TIM4);
GPIO_PinAFConfig(GPIOD,GPIO_PinSource15,GPIO_AF_TIM4);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;       //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;    //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;       //上拉
GPIO_Init(GPIOD,&GPIO_InitStructure);             //初始化PF9

TIM_TimeBaseStructure.TIM_Prescaler=83;  //定时器分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_Period=2499; //自动重装载值
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;

TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);//初始化定时器

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_High; //输出极性:TIM输出比较极性低

TIM_OC1Init(TIM4, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM12OC1
TIM_OC2Init(TIM4, &TIM_OCInitStructure);
  TIM_OC3Init(TIM4, &TIM_OCInitStructure);
  TIM_OC4Init(TIM4, &TIM_OCInitStructure);

TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM14在CCR1上的预装载寄存器
TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);

  TIM_ARRPreloadConfig(TIM4,ENABLE);//ARPE使能

  TIM_Cmd(TIM4, ENABLE);

TIM_SetCompare1(TIM4,501);