STM32定时中断（TIM定时器）

1-基本定时器

原理结构图为

#include "stm32f10x.h"                  // Device header
#include "tim.h"

void Timer_Init(void)
{
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	
	TIM_InternalClockConfig(TIM2);
	
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;//时钟分频
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;//选择上或者下计数
	TIM_TimeBaseInitStructure.TIM_Period = 100 - 1;//自动重装载值一般设置10的倍数
	TIM_TimeBaseInitStructure.TIM_Prescaler = 72 - 1;//预分频器     
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;//重复计数器（使用不到）
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
	
	TIM_ClearFlag(TIM2, TIM_FLAG_Update);//清除TIM2标志位
	TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);//中断使能
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//中断
	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_Init(&NVIC_InitStructure);
	
	TIM_Cmd(TIM2, ENABLE);//使能计数器
}


void TIM2_IRQHandler(void)
{
	if (TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)//获取中断标志位
	{
		
		TIM_ClearITPendingBit(TIM2, TIM_