定时器4输出3路PWM

路世英 · 发表于 2016-6-16 14:05:43

现在需要用到3路PWM波。目前使用的是TIM4，刚开始1通道输出正常，但是不能3路同时输出，是程序哪里设置错了？请指教，谢谢。void TIM4_PWM_Init(u32 arr,u32 psc)//1ms
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);    //TIM14时钟使能
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE); //使能PORTF时钟

GPIO_PinAFConfig(GPIOD,GPIO_PinSource12,GPIO_AF_TIM4); //GPIOF9复用为定时器14
GPIO_PinAFConfig(GPIOD,GPIO_PinSource13,GPIO_AF_TIM4); //GPIOF9复用为定时器14
GPIO_PinAFConfig(GPIOD,GPIO_PinSource14,GPIO_AF_TIM4); //GPIOF9复用为定时器14

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;          //GPIOF9
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(GPIOD,&GPIO_InitStructure);             //初始化PF9

GPIO_InitStructure.GPIO_Pin = GPIO_PinSource13;          //GPIOF9
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(GPIOD,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_PinSource14;          //GPIOF9
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(GPIOD,&GPIO_InitStructure);

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(TIM4,&TIM_TimeBaseStructure);//初始化定时器14

//初始化TIM14 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_OC1Init(TIM4, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 4OC1
TIM_OC2Init(TIM4, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 4OC1
TIM_OC3Init(TIM4, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 4OC1

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

TIM_ARRPreloadConfig(TIM4,ENABLE);//ARPE使能

TIM_Cmd(TIM4, ENABLE);  //使能TIM14

}