3. 定时器控制 LED 灯闪烁（定时器 1 ）

#include 
void TIM1_Init(void)
{
	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	//使能定时器1时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);//定时器1在桥2上
	TIM_TimeBaseStructure.TIM_Period = 10000-1;//ARR
	TIM_TimeBaseStructure.TIM_Prescaler = 7200;//PSC
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInit(TIM1, & TIM_TimeBaseStructure);
	//使能定时器1中断
	TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);
	//配置定时器1中断优先级
	NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;//刷新中断
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	//使能定时器1
	TIM_Cmd(TIM1,ENABLE);
	
}

#ifndef _TIM1_H_
#define _TIM1_H_
#include 
void TIM1_Init(void);
#endif

主函数

//程序目的：定时器1控制led闪烁
#include 
#include 
#include 
int main()
{
	NVIC_Configuration();
	Led_Init();
	TIM1_Init();
	while(1)
	{
	}
}
void TIM1_UP_IRQHandler(void)
{
	TIM_ClearFlag(TIM1,TIM_FLAG_Update);
	LED=~LED;
}