1、定时器初始化

    1. #include "bsp_time.h"
    3. void BSP_TIM3_INIT(uint16_t arr,uint16_t psc)
    4. {
    5.     //打开时钟
    6.     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
    7.     //定时器初始化
    8.     {
    9.         TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
    11.         TIM_TimeBaseInitStructure.TIM_Period    = arr-1;     //自动重装载值
    12.         TIM_TimeBaseInitStructure.TIM_Prescaler = psc-1;  //定时器分频
    13.         TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
    14.         TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1; 
    16.         TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);
    17.     }
    18.     //NVIC初始化
    19.     {
    20.         NVIC_InitTypeDef NVIC_InitStructure;
    22.         NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn; //定时器3中断
    23.         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01; //抢占优先级1
    24.         NVIC_InitStructure.NVIC_IRQChannelSubPriority=0; //子优先级3
    25.         NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
    27.         NVIC_Init(&NVIC_InitStructure);
    28.     }
    29.     //使能定时器和打开中断
    30.     {
    31.         TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //允许定时器3更新中断
    32.         TIM_Cmd(TIM3,ENABLE); //使能定时器3
    33.     }
    34. }

    2、中断函数使用

    1. //定时器3中断服务函数
    2. void TIM3_IRQHandler(void)
    3. {
    4.     if(TIM_GetITStatus(TIM3,TIM_IT_Update)==SET) //溢出中断
    5.     {
    7.     }
    8.     TIM_ClearITPendingBit(TIM3,TIM_IT_Update);  //清除中断标志位
    9. }