1 static void TIM3_Configuration(void)   //10ms

 2 {

 3   TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

 4   NVIC_InitTypeDef NVIC_InitStructure;

 5

 6   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);   // RCC_APB1为72M频率

 7

 8   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);                    //选择中断分组1

 9

10   NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;             //选择串口3中断

11   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;      //抢占式中断优先级设置为1

12   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;             //响应式中断优先级设置为1

13   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                //使能中断

14   NVIC_Init(&NVIC_InitStructure);

15

16   TIM_TimeBaseStructure.TIM_Period = 100;

17   TIM_TimeBaseStructure.TIM_Prescaler =7199;

18   TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

19   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

20   TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

21   TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE );

22   TIM_Cmd(TIM3, ENABLE);

23

24 }

25

26 void TIM3_IRQHandler(void) //TIM3 中断  10ms

27 {

28     if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查 TIM3 更新中断发生与否

29   {

30       TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清除 TIM3 更新中断标志

31   }

32 }