STM32单片机学习(5) 定时器中断实验

式TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位/*((1+7199[TIM_Prescaler] )/72M)*(1+4999[TIM_Period] )=500,000us=500ms */ TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断TIM_Cmd(TIM3, ENABLE); //使能TIMx}//定时器3中断服务程序void TIM3_IRQHandler(void) //TIM3中断{if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查TIM3更新中断发生与否{TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清除TIMx更新中断标志 if(!GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_0)) GPIO_SetBits(GPIOB,GPIO_Pin_0); else GPIO_ResetBits(GPIOB,GPIO_Pin_0); }}