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

通過定時(shí)器TIM3產(chǎn)生間隔時(shí)間為1秒的中斷，在中斷響應(yīng)

函數(shù)中控制LED發(fā)光二級管，實(shí)現(xiàn)流水燈效果

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

void TimeInit()

{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

//打開相應(yīng)的時(shí)鐘
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);


//清除TIM3的中斷待處理位:TIM 中斷源
TIM_ClearITPendingBit(TIM3,TIM_IT_Update);


//設(shè)置定時(shí)器TIM_TimeBaseInit初始化定時(shí)器的時(shí)鐘基數(shù)
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中斷
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE );


//使能TIM定時(shí)器
TIM_Cmd(TIM3, ENABLE);


//設(shè)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);

}

中斷函數(shù)編寫

//TIM3中斷響應(yīng)函數(shù)
void TIM3_IRQHandler(void)
{
static int i = 0;
//判斷是否發(fā)生中斷
if(TIM_GetITStatus(TIM3, TIM_IT_Update) == SET)
{
//清除EXTI線路掛起位
TIM_ClearITPendingBit(TIM3,TIM_IT_Update);

GPIO_Write(GPIOC, (u16)~(0x01<if(8 == i) i= 0;
}
}