简单驱动ds1302时钟芯片

#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int

sbit ledlk=P1^0;
sbit smglk=P1^1;
sbit smgbitlk=P1^2;

sbit rs=P3^4;
sbit en=P1^5;


sbit sclk=P0^0;
sbit rst=P0^1;
sbit io=P0^2;

uchar author[]="2000-00-00  ";
uchar mail[]="00:00:00";

uchar sec,min,hour,year,month,day,week;
void delayms(int ms)
{
    char i,j;
    for(i=0;i<ms;i++)
        for(j=0;j<120;j++);
}

void write_command(uchar com)
{
    en=0;
    rs=0;
    P2=com;
    delayms(5);   //time must be enough
    en=1;
    delayms(5);
    en=0;
    delayms(5);
}

void write_date(uchar date)
{
    en=0;
    rs=1;
    P2=date;
    delayms(5);
    en=1;
    delayms(5);
    en=0;
}

void init1602()
{
    write_command(0x38);
    write_command(0x0c);
    write_command(0x06);
    write_command(0x01);
}
void init()
{
    ledlk=0;
    smglk=0;
}

void write_address_date(uchar address,uchar date)
{
    uchar i;
    rst=0;
    sclk=0;
    rst=1;
    for(i=0;i<8;i++)
    {
        io=address&0x01;
        sclk=1;
        sclk=0;
        address>>=1;
    }
    delayms(5);
    for(i=0;i<8;i++)
    {    
        io=date&0x01;
        sclk=1;    
        sclk=0;
        date>>=1;
        
    }
    sclk=1;
}

uchar read_address_date(uchar address)
{
    uchar i,tmp,date=0x00;
    rst=0;
    sclk=0;
    rst=1;
    for(i=0;i<7;i++)
    {    
        io=address&0x01;
        sclk=1;
        sclk=0;
        address>>=1;
    }    
    io=address&0x01;
    sclk=1;
    delayms(5);
    for(i=0;i<8;i++)
    {
        date=date>>1;
        sclk=0;
        tmp=io;
        date=(tmp<<7)|date;
        sclk=1;
    }
    return date;
}

void set1302()
{
    write_address_date(0x8e,0x00);

    write_address_date(0x8c,0x09);
    write_address_date(0x8a,0x04);
    write_address_date(0x88,0x07);
    write_address_date(0x86,0x16);
    write_address_date(0x84,0x12);
    write_address_date(0x82,0x59);    
    
    write_address_date(0x80,0x00);
    write_address_date(0x8e,0x80);
}

void read1302()
{
    sec=read_address_date(0x81);
    min=read_address_date(0x83);
    hour=read_address_date(0x85);
    year=read_address_date(0x8d);
    month=read_address_date(0x89);
    day=read_address_date(0x87);
    week=read_address_date(0x8b);
    
}

    
void timeread()
{
    uchar s1,s2,m1,m2,h1,h2,y1,y2,mo1,mo2,d1,d2,w;
    read1302();
    s1=sec&0xf0;
    s1>>=4;    
    s2=sec&0x0f;
    m1=min&0xf0;
    m1>>=4;
    m2=min&0x0f;
    h1=hour&0xf0;
    h1>>=4;
    h2=hour&0x0f;
    y1=year&0xf0;
    y1>>=4;
    y2=year&0x0f;
    mo1=month&0xf0;
    mo1>>=4;
    mo2=month&0x0f;
    d1=day&0xf0;
    d1>>=4;
    d2=day&0x0f;
    w=week&0x0f;
    
    mail[0]=h1+\'0\';
    mail[1]=h2+\'0\';
    mail[3]=m1+\'0\';
    mail[4]=m2+\'0\';
    mail[6]=s1+\'0\';
    mail[7]=s2+\'0\';

    author[2]=y1+\'0\';
    author[3]=y2+\'0\';
    author[5]=mo1+\'0\';
    author[6]=mo2+\'0\';
    author[8]=d1+\'0\';
    author[9]=d2+\'0\';
    author[11]=w+\'0\';
}
            
    
void main()
{
    uchar i;
    init();
    init1602();
    set1302();
    while(1)
    {
        timeread();    
        write_command(0x80);
        for(i=0;i<sizeof(author)-1;i++)
        {
            write_date(author[i]);
            delayms(5);
        }
        write_command(0x80+0x40);
        delayms(5);
        for(i=0;i<sizeof(mail)-1;i++)
        {
            write_date(mail[i]);
            delayms(5);
        }
        delayms(100);
    }
}