STM32F4之TIMER定时器

//1、时钟使能

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE);

 

//2、定时器初始化配置 配置定时间隔

TIM_TimeBaseInitTypeDef  TIM_TimeBaseInitStructure;

 

TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;     //时钟分频因子 

TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式

TIM_TimeBaseInitStructure.TIM_Period = arr;  //自动重装载值

TIM_TimeBaseInitStructure.TIM_Prescaler=psc; //定时器分频

TIM_TimeBaseInit(TIM5,&TIM_TimeBaseInitStructure);    //初始化TIM5

//1)引脚初始化配置

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);      //GPIOx 时钟使能

GPIO_PinAFConfig(GPIOA,GPIO_PinSource0,GPIO_AF_TIM5);     //GPIOx_x复用为定时器x

 

GPIO_InitTypeDef     GPIO_InitStructure;

 

GPIO_InitStructure.GPIO_Pin     = GPIO_Pin_0;           //GPIOA_x

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(GPIOA, &GPIO_InitStructure);

//2)定时器模式初始化配置 PWM模式

 

TIM_OCInitTypeDef      TIM_OCInitStructure;

//初始化TIMx Channelx 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1

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能

TIM_OCInitStructure.TIM_Pulse = (arr+1)*0.5;  //CCR 设置占空比

TIM_OCInitStructure.TIM_OCPolarity     = TIM_OCPolarity_Low;//输出极性:TIM输出比较极性低

TIM_OC1Init(TIM5, &TIM_OCInitStructure);//根据T指定的参数初始化外设TIMx OC1

 

TIM_OC1PreloadConfig(TIM5, TIM_OCPreload_Enable);  //使能TIMx在CCR2上的预装载寄存器

TIM_ARRPreloadConfig(TIM5, ENABLE);//ARPE使能

NVIC_InitTypeDef  NVIC_InitStructure;

/* 设置中断管理 */

NVIC_InitStructure.NVIC_IRQChannel=TIM5_IRQn; //定时器5中断

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;     //抢占优先级1

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x03;         //子优先级3

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&NVIC_InitStructure);  

 

TIM_ITConfig(TIM5,TIM_IT_Update,ENABLE);//使能TIM5的更新中断

void TIM5_IRQHandler(void)

{

        if(TIM_GetITStatus(TIM5, TIM_IT_Update) == SET)

        {

        //DO

        }

        TIM_ClearITPendingBit(TIM5, TIM_IT_Update);

}