#include "timer.h"

void TIM3_Int_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	NVIC_InitTypeDef NVIC_InitStructure;

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //ʱÖÓʹÄÜ
	
	//¶¨Ê±Æ÷TIM3³õʼ»¯
	TIM_TimeBaseStructure.TIM_Period = arr; //ÉèÖÃÔÚÏÂÒ»¸ö¸üÐÂʼþ×°Èë»î¶¯µÄ×Ô¶¯ÖØ×°ÔؼĴæÆ÷ÖÜÆÚµÄÖµ	
	TIM_TimeBaseStructure.TIM_Prescaler =psc; //ÉèÖÃÓÃÀ´×÷ΪTIMxʱÖÓƵÂʳýÊýµÄÔ¤·ÖƵֵ
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //ÉèÖÃʱÖÓ·Ö¸î:TDTS = Tck_tim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòÉϼÆÊýģʽ
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õʼ»¯TIMxµÄʱ¼ä»ùÊýµ¥Î»
	TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //ʹÄÜÖ¸¶¨µÄTIM3ÖжÏ,ÔÊÐí¸üÐÂÖжÏ
	TIM_ClearITPendingBit(TIM3, TIM_IT_Update);  //Çå³ýTIMx¸üÐÂÖжϱêÖ¾ 

	//ÖжÏÓÅÏȼ¶NVICÉèÖÃ
	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3ÖжÏ
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //ÏÈÕ¼ÓÅÏȼ¶0¼¶
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //´ÓÓÅÏȼ¶3¼¶
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQͨµÀ±»Ê¹ÄÜ
	NVIC_Init(&NVIC_InitStructure);  //³õʼ»¯NVIC¼Ä´æÆ÷

	TIM_Cmd(TIM3, ENABLE);  //ʹÄÜTIMx					 
}
//¶¨Ê±Æ÷3ÖжϷþÎñ³ÌÐò
void TIM3_IRQHandler(void)   //TIM3ÖжÏ
{
	if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)  //¼ì²éTIM3¸üÐÂÖжϷ¢ÉúÓë·ñ
		{
		TIM_ClearITPendingBit(TIM3, TIM_IT_Update);  //Çå³ýTIMx¸üÐÂÖжϱêÖ¾ 
		LED1=!LED1;
		}
}