#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit DS1302_CLK=P1^2;
sbit DS1302_IO=P1^1;
sbit DS1302_RST=P1^0;
sbit lcden=P2^2;
sbit lcdwr=P2^1;
sbit lcdrs=P2^0;
unsigned char second,minute,hour,week,day,month,year;
unsigned char table[]="0123456789";
//unsigned char table1[]="          ";
unsigned char table2[]="                 ";
unsigned char table3[]="Time: ";
unsigned char table4[]="Date: ";
unsigned int time[]={
0x09,0x12,0x27,0x03,0x23,0x59,0x40
};
uchar num,count,date,shi;
void delay(uint z)
{
  uint x,y;
  for(x=z;x>0;x--)
    for(y=110;y>0;y--);
}
//向DS1302送一個字節//
void InputByte(unsigned char byte1)
{
 char i;
 for(i=8;i>0;i--)
   {
     DS1302_IO=(bit)(byte1&0x01);
     DS1302_CLK=1;
     _nop_();
     DS1302_CLK=0;
     byte1>>=1;
   }
    return;
}
//讀DS1302一個字節//
unsigned char outputbyte(void)
{
   unsigned char i;
   unsigned char ucdat=0;
   for(i=8;i>0;i--)
    {
     DS1302_IO=1;
     ucdat>>=1;
     if(DS1302_IO)ucdat|=0x80;
     DS1302_CLK=1;
     _nop_();
     DS1302_CLK=0;
    }     
    return(ucdat);

}
//向DS1302某地址寫一個字節數據//
void write_ds1302(unsigned char addr,unsigned char TDat)
{
 DS1302_RST=0;
 _nop_();
 DS1302_CLK=0;
 _nop_();
 DS1302_RST=1;
 InputByte(addr);
 _nop_();
 InputByte(TDat);
 DS1302_CLK=1;
 _nop_();
 DS1302_RST=0;
}
//讀DS1302地址子程序//
unsigned char read_ds1302(unsigned char addr)
{
   unsigned char timedata;
   DS1302_RST=0;
   _nop_();
   DS1302_CLK=0;
   _nop_();
   DS1302_RST=1;
   InputByte(addr);
   timedata=outputbyte();
   DS1302_CLK=1;
   _nop_();
   DS1302_RST=0;
   return(timedata);
}
//DS1302的初始化//
void initial_ds1302()
{
  write_ds1302(0x8e,0x00);//寫保護寄存器
  write_ds1302(0x8c,time[0]);//年
  write_ds1302(0x88,time[1]);//月
  write_ds1302(0x86,time[2]);//日
  write_ds1302(0x8A,time[3]);//星期
  write_ds1302(0x84,time[4]);//時
  write_ds1302(0x82,time[5]);//分
  write_ds1302(0x80,time[6]);//秒
  write_ds1302(0x8e,0x80);//寫保護寄存器
}
//讀DS1302時間//
void read_time()
{
 second=read_ds1302(0x81);
 minute=read_ds1302(0x83);
 hour=read_ds1302(0x85);
 week=read_ds1302(0x8B);
 day=read_ds1302(0x87);
 month=read_ds1302(0x89);
 year=read_ds1302(0x8d);

}

//液晶顯示程序//
void write_com(uchar com)//寫指令//
{
  lcdrs=0;            
 lcdwr=0;
 P0=com;
 delay(5);
 lcden=1;
 delay(5);
 lcden=0;
}
void write_data(uchar date)   //寫數據//
{
  lcdrs=1;
 lcdwr=0;
 P0=date;
 delay(5);
 lcden=1;
 delay(5);
 lcden=0;
}
void init()
{
 
  lcden=0;
  write_com(0x38);    //置初值//
  write_com(0x0c);
  write_com(0x06);
  write_com(0x81);
}
void Display(void)
{
    num=0;
    count=0;
    for(date=0;date<6;date++)
      {
         write_data(table3[date]);
      }
    //write_com(0x81);
    write_data(table[hour/16]);   //寫第1行數據//
    write_data(table[hour%16]);
    write_data(':');

    write_data(table[minute/16]);
    write_data(table[minute%16]);
    write_data(':');

    write_data(table[second/16]);        
    write_data(table[second%16]);
    //write_com(0x01);  
    write_com(0x80+0x41);
    for(shi=0;shi<6;shi++)
      {
         write_data(table4[shi]);
      }
    write_data(table[year/16]);
    write_data(table[year%16]);
    write_data('-');
    write_data(table[month/16]);
    write_data(table[month%16]);
    write_data('-');
    write_data(table[day/16]);
    write_data(table[day%16]);
  
    write_com(0x80);
    for(count=0;count<16;count++);
      {
        write_data(table2[count]);        
      }
   
}
int main(void)
{
    initial_ds1302();
    init();
    for(;;)
      {
       read_time();
       Display();
      }
}

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