/*************************/
#define TM_SEC   XBYTE[0xFF00] 
#define TM_MIN   XBYTE[0xFF02] 
#define TM_HOU   XBYTE[0xFF04] 
#define DAY   XBYTE[0xFF06] 
#define DATE    XBYTE[0xFF07] 
#define MONTH   XBYTE[0xFF08] 
#define YEAR   XBYTE[0xFF09]

#define AM_SEC   XBYTE[0xFF01] 
#define AM_MIN   XBYTE[0xFF03] 
#define AM_HOU   XBYTE[0xFF05]

#define REG_A      XBYTE[0xFF0a] 
#define REG_B      XBYTE[0xFF0b]
#define REG_C      XBYTE[0xFF0c]
#define REG_D      XBYTE[0xFF0d]

/********************************************************************/
#define  LCDIO   P2
#define  LINE1   0
#define  LINE2   1
#define  HIGH   1
#define  LOW    0
#define  CLEARSCREEN  LCD_en_command(0x01)
#define  LCD_DELAY_TIME 40
/*******************************************************************/
sbit RS=P0^7;   //数据、命令选择 1：数据 0：指令  4脚 
sbit RW=P0^6;   //读、写操作选择 1：读   0：写  5脚
sbit E=P0^5;   //使能信号        6脚
/********************************************************************/
void LCD_delay(void);
void LCD_en_command(unsigned char command);
void LCD_en_dat(unsigned char temp);
void LCD_set_xy( unsigned char x, unsigned char y );
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat);
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_init(void);
/********************************************************************/
void Set_calendar(void);
void Read_calendar(void);
void Start_calendar(void);
void Display_calendar(void);

void Stop_calendar(void);

/********************************************************************/
void delay_nms(unsigned int n);
/********************************************************************/

code unsigned char calendar_day[7][3]={"MON","TUE","WEN","THU","FRI","SAT","SUN"};  
unsigned char calendar_time[7]={05,8,16,18,58,55,2}; /* 05/8/16 18:58:00 星期二*/            
code unsigned char at[7]={9,8,7,4,2,0,6};   /* 年、月、日、时、分、秒 、星期*/
unsigned char xdata *calendar_address=0xff00;

void main(void)
{
 LCD_init(); 
 //Set_calendar(); 
    Start_calendar();
    Stop_calendar();
 while(1)    
 {
  Read_calendar();   
  Display_calendar();
 }
}
/********************************************************************/
/******************** LCD PART *************************************/
void LCD_delay(void)//延时子函数   
{
 unsigned char i;
 for(i=LCD_DELAY_TIME;i>0;i--);  //保证lcd复位的最小延时
}

void LCD_en_command(unsigned char command)//写命令函数
{
 LCDIO=command;
 RS=LOW;   
 RW=LOW;
 E=LOW;
 LCD_delay();
 E=HIGH;
}

void LCD_en_dat(unsigned char dat)//写数据函数
{
 LCDIO=dat;
 RS=HIGH;
 RW=LOW;
 E=LOW;
 LCD_delay();
 E=HIGH;
}

void LCD_set_xy( unsigned char x, unsigned char y )  //设置地址函数
{
 unsigned char address;
 if (y == 0) 
  address = 0x80 + x;
 else 
     address = 0xc0 + x;
 LCD_en_command(address); 
}

void LCD_write_char( unsigned x,unsigned char y,unsigned char dat)//写字符函数
{
 LCD_set_xy( x, y ); 
 LCD_en_dat(dat);
}

void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)//写字符串函数
{
    LCD_set_xy( X, Y ); //写地址 
    while (*s)  // 写显示字符
    {
     LCDIO=*s;
        LCD_en_dat(*s);   
 s ++;
    }
}

void LCD_init(void)//初始化子函数
{ 
 CLEARSCREEN;//清屏
 LCD_en_command(0x38);//设置8位串数据格式
 LCD_en_command(0x0c);//开显示器
 LCD_en_command(0x80);//显示起始地址
 CLEARSCREEN;//清屏
}
/********************************************************************/

void Set_calendar(void) //设置系统时间
{
 unsigned char i;
 REG_B=0x80; 
 for(i=0;i<9;i++)
 *(calendar_address+at[i])=calendar_time[i];
 
}

void Read_calendar(void) //读取系统时间
{
 unsigned char  temp,i;  
 REG_B=0x06;
 do{ temp=REG_A;} 
  while(temp&0x80);
 for(i=0;i<7;i++)
  calendar_time[i]=*(calendar_address+at[i]);    
 
}

void Start_calendar(void) //启动时钟
{
 REG_A=0x20;
 REG_B=0x06;
}
/********************************************************************/
void Display_calendar(void)
{
 LCD_write_string(0,LINE1,"                 ");
 
 LCD_write_string(0,LINE1,"20  -  -  ");
 LCD_write_char(0x02,LINE1,(calendar_time[0]/10)|0X30);
 LCD_write_char(0x03,LINE1,(calendar_time[0]%10)|0X30);
 LCD_write_char(0x05,LINE1,(calendar_time[1]/10)|0X30);
 LCD_write_char(0x06,LINE1,(calendar_time[1]%10)|0X30);
 LCD_write_char(0x08,LINE1,(calendar_time[2]/10)|0X30);
 LCD_write_char(0x09,LINE1,(calendar_time[2]%10)|0X30);
 if(calendar_time[6]==1)
  LCD_write_string(0x0d,LINE1,"Mon");
 if(calendar_time[6]==2)
  LCD_write_string(0x0d,LINE1,"Tue");
 if(calendar_time[6]==3)
  LCD_write_string(0x0d,LINE1,"Wen");
 if(calendar_time[6]==4)
  LCD_write_string(0x0d,LINE1,"Thu");
 if(calendar_time[6]==5)
  LCD_write_string(0x0d,LINE1,"Fri");
 if(calendar_time[6]==6)
  LCD_write_string(0x0d,LINE1,"Sat");
 if(calendar_time[6]==7)
  LCD_write_string(0x0d,LINE1,"Sun");
  
 LCD_write_string(0,LINE2,"          :  :"); 
 LCD_write_char(0x08,LINE2,(calendar_time[3]/10)|0X30);
 LCD_write_char(0x09,LINE2,(calendar_time[3]%10)|0X30);
 LCD_write_char(0x0b,LINE2,(calendar_time[4]/10)|0X30);
 LCD_write_char(0x0c,LINE2,(calendar_time[4]%10)|0X30);
 LCD_write_char(0x0e,LINE2,(calendar_time[5]/10)|0X30);
 LCD_write_char(0x0f,LINE2,(calendar_time[5]%10)|0X30);
}

void Stop_calendar(void)
{
 REG_A=0x70;
}