/***********************************************************

通过定时器TIM3产生间隔时间为1秒的中断，在中断响应

函数中控制LED发光二级管，实现流水灯效果

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void TimeInit()

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

NVIC_InitTypeDef NVIC_InitStructure;

//打开相应的时钟

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

//清除TIM3的中断待处理位:TIM 中断源

TIM_ClearITPendingBit(TIM3,TIM_IT_Update);

//设置定时器TIM_TimeBaseInit初始化定时器的时钟基数

TIM_TimeBaseStructure.TIM_Period = 2000 -1;

TIM_TimeBaseStructure.TIM_Prescaler = 36000 -1;

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM3, & TIM_TimeBaseStructure);

//使能指定的TIM中断

TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE );

//使能TIM定时器

TIM_Cmd(TIM3, ENABLE);

//设置NVIC

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

中断函数编写

//TIM3中断响应函数

void TIM3_IRQHandler(void)

{

static int i = 0;

//判断是否发生中断

if(TIM_GetITStatus(TIM3, TIM_IT_Update) == SET)

{

//清除EXTI线路挂起位

TIM_ClearITPendingBit(TIM3,TIM_IT_Update);

GPIO_Write(GPIOC, (u16)~(0x01

}

}