第一步，你得开定时器的时钟，如RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 , ENABLE);
第二步，你得配置定时器具体参数，如
TIM_DeInit(TIM2);
TIM_TimeBaseStructure.TIM_Period=1000; /*
TIM_TimeBaseStructure.TIM_Prescaler= (72 - 1);
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
第三步，使能TIM2 ,TIM_Cmd(TIM2, ENABLE);
第四步，配置中断优先级，
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
第五步，写中断服务函数，即定时器时间到后进入中断后要处理什么事情——
void TIM2_IRQHandler(void)
{
if ( TIM_GetITStatus(TIM2 , TIM_IT_Update) != RESET )
{
TIM_ClearITPendingBit(TIM2 , TIM_FLAG_Update);
time++;
}
}
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楼主
