定时器中断

void TIM1_Int_Init(u16 arr, u16 psc)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);          //时钟使能
这里经常不注意，APB12前后要对应
    TIM_TimeBaseStructure.TIM_Period = arr;                    //重装载值
    TIM_TimeBaseStructure.TIM_Prescaler = psc;                 //预分频值
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;    //时钟分割，用不到
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数模式
    TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;           //定时器1和8需要填这个
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);               //初始化定时器
    TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE );                   //定时器中断配置，更新中断

    NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;               
    NVIC_Init(&NVIC_InitStructure);                               //NVIC配置
    TIM_Cmd(TIM1, ENABLE);                                        //使能定时器
}

void TIM1_UP_IRQHandler(void)
{
    if(TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)
    {

    }
    TIM_ClearFlag(TIM1, TIM_IT_Update );
}