#include "reg51.h"
#define uchar unsigned char
#define uint     unsigned int
sbit DQ   = P3^7;
sbit sign = P3^3;
sbit set_key = P3^0;
sbit up_key = P3^1;
sbit down_key = P3^2;

uint sec;
uint min=23;
uint hour=12;
uint day=10;
uint month=10;
uint yearl=7;
uint yearh=20;
uint tcnt;
uint cursor=0;
uchar a=0xff;
uchar code Seg[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

void delay(uint t)
{
       uint i;
       while(t--)
       {for (i=0;i<125;i++);}
}
void Tdelay(unsigned int i)
{
	while(i--);
}
void Kdelay()
{
       uchar i,j;
       for(i=100;i>0;i--) 
       for(j=248;j>0;j--);
}
Init_DS18B20(void)
{
	unsigned char x=0;
	DQ = 1;    
	Tdelay(8);  
	DQ = 0;    
	Tdelay(80); 
	DQ = 1;    
	Tdelay(14);
	Tdelay(20);
}
//讀一個字節(jié)
ReadOneChar(void)
{
	unsigned char i=0;
	unsigned char dat = 0;
	for (i=8;i>0;i--)
	{
	     DQ = 0; 
	     dat>>=1;
	     DQ = 1; 
	     if(DQ)
	      dat|=0x80;
	     Tdelay(4);
	}
	return(dat);
}//寫一個字節(jié)
WriteOneChar(unsigned char dat)
{
	unsigned char i=0;
	for (i=8; i>0; i--)
	{
	     DQ = 0;
	     DQ = dat&0x01;
	     Tdelay(5);
	     DQ = 1;
	     dat>>=1;
	}
}//讀取溫度
ReadTemperature(void)
{
	unsigned char a=0;
	unsigned char b=0;
	unsigned int t=0;
	float tt=0;
	Init_DS18B20();
	WriteOneChar(0xCC); 
	WriteOneChar(0x44); 
	Init_DS18B20();
	WriteOneChar(0xCC); 
	WriteOneChar(0xBE);
	a=ReadOneChar();
	b=ReadOneChar();
	t=b;
	t<<=8;
	t=t|a;
	tt=t*0.0625;        
	t= tt*10+0.5;      
	return(t);
}
void display(uchar L1,uchar L2,uchar L3,uchar L4,uchar L5,uchar L6,uchar L7,uchar L8,uchar L9,uchar L10,uchar L11,uchar L12,uchar L13,uchar L14,uchar L15,uchar L16)
{
       P2=0x7F;P0=L1;delay(1);     //yearh
       P2=0xBF;P0=L2;delay(1);     //yearh
       if(cursor==6){P2=0xDF|a;P0=L3;delay(1);}else{P2=0xDF;P0=L3;delay(1);}      //yearl
       if(cursor==6){P2=0xEF|a;P0=L4;delay(1);}else{P2=0xEF;P0=L4;delay(1);}      //yearl
       if(cursor==5){P2=0xF7|a;P0=L5;delay(1);}else{P2=0xF7;P0=L5;delay(1);}      //month
       if(cursor==5){P2=0xFB|a;P0=L6;delay(1);}else{P2=0xFB;P0=L6;delay(1);}      //month
       if(cursor==4){P2=0xFD|a;P0=L7;delay(1);}else{P2=0xFD;P0=L7;delay(1);}      //day
       if(cursor==4){P2=0xFE|a;P0=L8;delay(1);}else{P2=0xFE;P0=L8;delay(1);}      //day
       P2=0xFF;
       if(cursor==3){P1=0x7F|a;P0=L9;delay(1);}else{P1=0x7F;P0=L9;delay(1);}      //hour
       if(cursor==3){P1=0xBF|a;P0=L10;delay(1);}else{P1=0xBF;P0=L10;delay(1);}     //hour
       if(cursor==2){P1=0xDF|a;P0=L11;delay(1);}else{P1=0xDF;P0=L11;delay(1);} //min
       if(cursor==2){P1=0xEF|a;P0=L12;delay(1);}else{P1=0xEF;P0=L12;delay(1);} //min
       if(cursor==1){P1=0xF7|a;P0=L13;delay(1);}else{P1=0xF7;P0=L13;delay(1);} //sec
       if(cursor==1){P1=0xFB|a;P0=L14;delay(1);}else{P1=0xFB;P0=L14;delay(1);} //sec
       P1=0xFD;P0=L15;delay(1); //temp
       P1=0xFE;P0=L16;delay(1); //temp
       P1=0xFF;
}
main()
{   
       uint i;    
       TMOD=0x02;               //設(shè)置模式為定時器T0的模式2 （8位自動重裝計數(shù)初值的計數(shù)值）        
       TH0=0x06;                //設(shè)置計數(shù)器初值，靠TH0存儲重裝的計數(shù)值X0=256-250=6
       TL0=0x06;
       TR0=1;                   //啟動T0
       ET0=1;                   //開啟定時器T0中斷允許
       EA=1;                    //開啟中斷總控制
       while(1)
       {
           if(set_key==0)
           {
               Kdelay();
               if(set_key==0)
               {
                   cursor++;
                   if(cursor>=7){cursor=0;}
               }
           }
           if(up_key==0)
           {
               Kdelay();
               if(up_key==0)
               {
                   if(cursor==1){sec++;if(sec==60)sec=0;}
                   if(cursor==2){min++;if(min==60)min=0;}
                   if(cursor==3){hour++;if(hour==24)hour=0;}
                   if(cursor==4){day++;if(day==31)day=1;}
                   if(cursor==5){month++;if(month==13)month=1;}
                   if(cursor==6){yearl++;if(yearl==100)yearl=0;}
                   if(cursor==7){yearh++;if(yearh==30)yearh=20;}
               }
           }
           if(down_key==0)
           {
               Kdelay();
               if(down_key==0)
               {
                   if(cursor==1){sec--;if(sec==00)sec=59;}
                   if(cursor==2){min--;if(min==0)min=59;}
                   if(cursor==3){hour--;if(hour==0)hour=23;}
                   if(cursor==4){day--;if(day==0)day=31;}
                   if(cursor==5){month--;if(month==0)month=12;}
                   if(cursor==6){yearl--;if(yearl==0)yearl=99;}
                   if(cursor==7){yearh--;if(yearh==20)yearh=30;}
               }
           }
           i=ReadTemperature();
           display(Seg[yearh/10],Seg[yearh%10],Seg[yearl/10],Seg[yearl%10],Seg[month/10],Seg[month%10],Seg[day/10],Seg[day%10],Seg[hour/10],Seg[hour%10],Seg[min/10],Seg[min%10],Seg[sec/10],Seg[sec%10],Seg[i/100],Seg[i/10%10]);     
       }
}
void t0(void)interrupt 1 using 0      //t0的中斷程序
{
       tcnt++;
       if(tcnt==4000)//定時器的定時計數(shù)，4000次250us為1秒
       {
           tcnt=0;
           sign=~sign;
           a=~a;
           sec++;
           if(sec==60)
           {     
               sec=0;
               min++;
               if(min==60)
               {
                   min=0;
                   hour++;
                   if(hour==24)
                   {
                       hour=0;
                       day++;
                       if(month==2&&((yearl==0&&yearh%4==0)||(yearl!=0&&yearl%4==0))&&day==30)day=1;  
                       else if(month==2&&day==29)day=1;
                       else if((month==4||month==6||month==9||month==11)&&day==31)day=1;
                       else if(day==32)day=1;
                       if(day==1)
                       {
                       month++;
                       if(month==13)
                       {
                           month=1;
                           yearl++;
                           if(yearl==100)
                           {
                               yearl=0;
                               yearh++;
                               if(yearh==100)
                               {
                                   yearh=20;
                               }
                           }
                       }
                   }
                   }
               }
           }
       }
}