有关DS1302时钟芯片BCD码和十六进制的转换

只看该作者 · 2013-4-30 12:45

#include<reg52.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int
uchar second,minute,hour,week,day,month,year;
uchar time[]  ={0x12,0x07,0x26,0x08,0x07,0x07,0x04};       //初始时间数组

sbit DS1302_RST = P3^3;
sbit DS1302_IO = P2^4;
sbit DS1302_SCLK = P3^2;

sbit LCD_EN = P3^4;
sbit LCD_RW = P3^6;
sbit LCD_RS = P3^5;

uchar code dis1[]={" DS1302+LCD12864"};
uchar code dis2[]={" 暑假学习 "};

/***************************延时函数*******************************/

void delay(uint xms)
{
      uint i,j;
      for(i=xms;i>0;i--)
            for(j=110;j>0;j--);
}

/******************向DS1302送一字节数据*****************************/

void input_byte(uint temp)
{
      char i;
      for(i=8;i>0;i--)
      {
            DS1302_IO = (bit)(temp&0x01);
            DS1302_SCLK=1;
            _nop_();
            DS1302_SCLK=0;
            temp>>= 1;
      }
}

/***********************:读DS1302一个字节***************************/

uchar output_byte(void )
{
      uchar i;
      uchar ucdat = 0;
      for(i = 8; i > 0; i--)
      {
            DS1302_IO  = 1;
            ucdat >>= 1;
            if(DS1302_IO)
ucdat |= 0x80;
            DS1302_SCLK = 1;
            _nop_();
            DS1302_SCLK= 0;
      }
      return(ucdat);
}

/******************向DS1302某地址写一字节数据***********************/

void write_1302(uchar add,uchar dat)
{
      DS1302_RST = 0;
      _nop_();
      DS1302_SCLK = 0;
      _nop_();
      DS1302_RST = 1;
      input_byte(add);
      _nop_();
      input_byte(dat);
      DS1302_SCLK = 1;
      _nop_();
      DS1302_RST = 0;
}

/*****************************读DS1302地址***************************/

uchar read_1302(uchar add)
{
      uchar abc;
      DS1302_RST=0;
      _nop_();
      DS1302_SCLK=0;
      _nop_();
      DS1302_RST=1;
      input_byte(add);
      abc=output_byte();
      DS1302_SCLK=1;
      _nop_();
      DS1302_RST=0;
      return(abc);
}

/***************************初始化DS1302******************************/

void init_ds1302()
{
      write_1302(0x8e,0x00);             //写保护寄存器，在对时钟或RAM写前WP一定要为0
      write_1302(0x8c,time[0]);       //年
      write_1302(0x88,time[1]);       //月
      write_1302(0x86,time[2]);       //日
      write_1302(0x84,time[3]);       //时
      write_1302(0x82,time[4]);       //分
      write_1302(0x80,time[5]);       //秒
      write_1302(0x8A,time[6]);       //星期
      write_1302(0x8e,0x80);             //写保护寄存器
}

/*************************读DS1302时间***********************************/

void read_time()
{
      second=read_1302(0x81);       //秒寄存器
      minute=read_1302(0x83);       //分
      hour=read_1302(0x85);          //时
      day=read_1302(0x87);       //日
      month=read_1302(0x89);          //月
      week=read_1302(0x8b);          //星期
      year=read_1302(0x8d);          //年
}

/***********************写指令数据到LCD*********************************/

void write_cmd(uchar cmd)
{
      LCD_RS = 0;
      LCD_RW = 0;
      LCD_EN = 0;
      P0 = cmd;
      delay(5);
      LCD_EN=1;
      delay(5);
      LCD_EN=0;
}

/***************************写显示数据到LCD******************************/

void  write_dat(uchar dat)
{
      LCD_RS = 1;
      LCD_RW = 0;
      LCD_EN = 0;
      P0 = dat;
      delay(5);
      LCD_EN = 1;
      delay(5);
      LCD_EN = 0;
}

/***************************设定显示位置**********************************/

void lcd_pos(uchar X,uchar Y)
{
      uchar pos;
      if(X == 0)
      {X = 0x80;}
      else if (X == 1)
      {X = 0x90;}
      else if (X == 2)
      {X = 0x88;}
      else if (X == 3)
      {X = 0x98;}
      pos = X+Y;
      write_cmd(pos);
}
void writesting(uchar x,uchar y,uchar *p)
{
      uchar temp;
      temp=*p;
      lcd_pos(x,y);
      while(temp)
      {
            write_dat(temp);
            temp=*(++p);
      }
}
/*******************************LCD初始化**********************************/

void lcd_init()
{
      write_cmd(0x30);
      delay(5);
      write_cmd(0x0c);
      delay(5);
      write_cmd(0x01);
      delay(5);
}

/*********************************显示函数*********************************/

void display()
{
      lcd_pos(2,2);
      write_dat((year/16)  + 0x30);
      write_dat((year%16)  + 0x30);
      writesting(2,1,"20");

      lcd_pos(2,4);
      write_dat((month/16)  + 0x30);
      write_dat((month%16)  + 0x30);
      writesting(2,3,"-");

      lcd_pos(2,6);
      write_dat((day/16)  + 0x30);
      write_dat((day%16)  + 0x30);
      writesting(2,5,"-");

      lcd_pos(3,0);
      write_dat((hour/16)  + 0x30);
      write_dat((hour%16)  + 0x30);
      writesting(3,1,":");

      lcd_pos(3,2);
      write_dat((minute/16)  + 0x30);
      write_dat((minute%16)  + 0x30);
      writesting(3,3,":");
      lcd_pos(3,4);
      write_dat((second/16)  + 0x30);
      write_dat((second%16)  + 0x30);
      writesting(3,5,"星");
      writesting(3,6,"期");

      switch(week)
      {
            case 1:       writesting(3,7,"一");break;
            case 2:       writesting(3,7,"二");break;
            case 3:       //writesting(3,7,"三");       无法识别这一条语句
                              {write_dat(0xc8);write_dat(0xfd);}          //与上一条语句等价，用来显示“三”
                                    break;
            case 4:       writesting(3,7,"四");break;
            case 5:       writesting(3,7,"五");break;
            case 6:       writesting(3,7,"六");break;
            case 7:       writesting(3,7,"七");break;
      }
      write_dat((week/16)  + 0x30);
      write_dat(week%16+0x30);
}

/*****************************显示位置*********************************/
void LCD_pos()
{
      uchar i;
      lcd_pos(0,0);             //显示字符
i=0;
while(dis1[i]!='\0')
{
      write_dat(dis1[i]);
      i++;
}

lcd_pos(1,0);                //显示字符
i=0;
while(dis2[i]!='\0')
{
      write_dat(dis2[i]);
      i++;
}

}

/********************************主函数************************************/

void main()
{
      init_ds1302();
      lcd_init();
      LCD_pos();
      while(1)
      {
         read_time();
         display();

      }
}