//声明一个GPIO结构体变量GPIO_InitTypeDef GPIO_InitStructure;//声明一个定时器结构体变量TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructrue;//声明一个中断优先分组的结构体变量NVIC_InitTypeDef NVIC_InitStructure;//使能GPIO外设时钟RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);//定义一个GPIO结构体变量GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9 |GPIO_Pin_10;//对应引脚分别接到Led0，led1GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;         //GPIO为输出模式GPIO_InitStructure.GPIO_Speed=GPIO_Speed_100MHz;    //100MHZGPIO_InitStructure.GPIO_OType=GPIO_OType_PP;        //推挽输出GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;          //上拉­GPIO_Init(GPIOF,&GPIO_InitStructure);//¶设置定时器中断的优先分组NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;   //抢占优先级为1NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x03;          //响应优先级为3TIM_TimeBaseInitStructrue.TIM_Period=4999;     //Tout=(ARR+1)(PSC+1)/Tclk   (4999+1)(8399+1)/(1/84M)TIM_TimeBaseInitStructrue.TIM_Prescaler=8399;TIM_TimeBaseInitStructrue.TIM_CounterMode=TIM_CounterMode_Up;TIM_TimeBaseInitStructrue.TIM_ClockDivision=TIM_CKD_DIV1;//使能定时器3的外设时钟RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);//初始化定时器3TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructrue);//设置优先级分组  为组2NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//初始化优先级分组NVIC_Init(&NVIC_InitStructure);//配置定时器的中断的中断源TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);//使能定时器3TIM_Cmd(TIM3,ENABLE);while(1){//无限循环等待中断}}
//定时器3的中断函数
void TIM3_IRQHandler(void)
{if(TIM_GetITStatus(TIM3,TIM_IT_Update)!=RESET){LED0=!LED0;LED1=!LED1;TIM_ClearITPendingBit(TIM3,TIM_IT_Update);}
}