#include "timer.h"
#include "main.h"
#include "keyboard.h"
#include "led.h"

unsigned char display_buffer[4];        //顯示緩沖區(qū),共4位

unsigned char minute=0;         //定義默認(rèn)定時(shí)時(shí)間
unsigned char second=0;	
unsigned char setminute=0,setsecond=20;	 //設(shè)置定時(shí)時(shí)間
    
unsigned char n_50m_second;     //保存多少個(gè)50毫秒的變量


unsigned char coming1=15;     //15秒燈光提示 
unsigned char coming2=3;      // 3秒聲音提示
bit beepcome=0;              //到時(shí)標(biāo)記位


//unsigned char flicker_time=0;     //閃爍頻率
//unsigned char display_on=1;       //顯示開關(guān)標(biāo)志。用來(lái)產(chǎn)生閃爍效果
unsigned int status=1;           //狀態(tài)值	  1 設(shè)置 ； 2 計(jì)時(shí)

unsigned int alarmtime1=0,alarmtime2=0;
unsigned int alarmspeed=300;

void timer0_isr(void) interrupt 1 using 1      //定時(shí)器0中斷處理倒計(jì)時(shí)函數(shù)
{
	TL0=0xB9;
	TH0=0x3C;                              //定時(shí)器重裝。定時(shí)50mS中斷一次
	n_50m_second++;
	if (n_50m_second>=20)                  //1秒到
	{
		n_50m_second=0;                     //清50毫秒計(jì)數(shù)
		second--;                        //秒減1
		if(second==0xff)                      //如果秒到00
		{
			second=59;                         //秒變59秒
			minute--;                         //分減1
			if(minute==0xff)                    //如果分到00
			{
				minute=0;                       //分清0
				second=0;
				beepcome=1;                     //標(biāo)記beepcome
				TR0=0;
				EA=0;                           //取消計(jì)時(shí)中斷
			}
		}
	}
}





void timer(void)
{


	if (minute ==0 && second<=coming1 && TR0==1)    	//開始燈光提示
	{
		alarmtime1+=10;  	
		if (alarmtime1>=alarmspeed) {P0_0=~P0_0;alarmtime1=0;alarmspeed-=2;}   //蜂鳴器,LED切換

		if (minute ==0 && second<=coming2 && TR0==1)		 //開始聲音提示
		{
			alarmtime2+=10;  	
			if (alarmtime2>=alarmspeed) {P0_1=~P0_1;alarmtime2=0; }
		}

	} 



 
 switch (status)	 //1為設(shè)置狀態(tài)，2為計(jì)時(shí)狀態(tài)
 {
   case 1:          //============================設(shè)置狀態(tài)===================================
   {
	if(key==KEY_START)           //開始計(jì)時(shí)
	{
	  minute=setminute; //載入設(shè)置時(shí)間
	  second=setsecond;
	  EA=1;	  		//開始計(jì)時(shí)
	  TR0=1;
	  status=2;	 //進(jìn)入計(jì)時(shí)狀態(tài)
	  key=0;
	} 

     if(key==KEY_MIN)             //調(diào)整分功能
      {
       setminute++;
	   if (setminute>=100) setminute=0;

       key=0;
      }
      if(key==KEY_SEC)            //調(diào)整秒功能
      {
        setsecond++;
		if (setsecond>=60) setsecond=0;
        key=0;
      }
      if(key==KEY_RESET)           //重置功能
      {
        key=0;
      }
	  	showset();   				 //調(diào)用顯示設(shè)置函數(shù)
		display(display_buffer);      //顯示結(jié)果
    break;
   }


   case 2:                     //=======================計(jì)時(shí)狀態(tài)=====================================
    {
	 if(key==KEY_RESET)          //如果設(shè)置鍵按下
	 {
	   status=1;		         //進(jìn)入設(shè)置狀態(tài)
	   key=0;                    //清鍵值
	 }

	 if(key==KEY_MIN)           //調(diào)整分功能
	 {
		 key=0;	
	 }

	 if(key==KEY_SEC)          //調(diào)整秒功能
	 {
		 key=0;
	 }

     if(key==KEY_START)     // 轉(zhuǎn)為暫停         
      {
	   TR0=~TR0; //暫停、啟動(dòng)計(jì)時(shí)器
       key=0;
      }
		showtime();   				 //調(diào)用顯示時(shí)間函數(shù)
		display(display_buffer);      //顯示結(jié)果
		break;
    }
 }

}







void showtime(void)	//顯示當(dāng)前剩余時(shí)間
{
       display_buffer[0]=second%10;
       display_buffer[1]=second/10;
       display_buffer[2]=minute%10;
       display_buffer[3]=minute/10;
}

void showset(void)	//顯示當(dāng)前設(shè)置時(shí)間
{
       display_buffer[0]=setsecond%10;
       display_buffer[1]=setsecond/10;
       display_buffer[2]=setminute%10;
       display_buffer[3]=setminute/10;
}


/*
void beeping(void)
{
	if (beeptime>0) 
		{
		P0_5=0;
		P0_0=1;
		beeptime--;
		}
	else
	    {
		P0_5=1;
		P0_0=0;
		beepcome=0;
		beeptime=20;
		}

}
*/