均基于72Mhz时钟频率

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

void Timer_Init(void)
{
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	
	TIM_InternalClockConfig(TIM2); //可有可无
	
	TIM_TimeBaseInitTypeDef TIM_TimeBase;
	TIM_TimeBase.TIM_ClockDivision = TIM_CKD_DIV1;  //几分频
	TIM_TimeBase.TIM_CounterMode = TIM_CounterMode_Up; //向上计数
	TIM_TimeBase.TIM_Period = 5000 - 1;
	TIM_TimeBase.TIM_Prescaler = 2880 - 1;
	TIM_TimeBase.TIM_RepetitionCounter = 0;
	
	TIM_TimeBaseInit(TIM2, &TIM_TimeBase);
	
	TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	
	NVIC_InitTypeDef NVIC_Initstr;
	NVIC_Initstr.NVIC_IRQChannel= TIM2_IRQn; //中断通道
	NVIC_Initstr.NVIC_IRQChannelCmd= ENABLE; // 使能
	NVIC_Initstr.NVIC_IRQChannelPreemptionPriority= 1;
	NVIC_Initstr.NVIC_IRQChannelSubPriority= 2;
	NVIC_Init(&NVIC_Initstr);
	
	TIM_Cmd(TIM2, ENABLE);//启动定时器
}