51单片机数码管万年历代码

以下是一个简单的51单片机数码管万年历的代码，仅供参考：

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

#define uchar unsigned char
#define uint unsigned int

sbit DULA=P2^6;
sbit WELA=P2^7;

uchar code table[]={
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f, //0~9的数码管编码
0x77,0x7c,0x39,0x5e,0x79,0x71,0x00 //A~F的数码管编码
};
uint year,month,day,week,hour,minute,second;

void delay(uint x)
{
    uint i,j;
    for(i=x;i>0;i--)
        for(j=114;j>0;j--);
}

void display(uchar addr,uchar dat)
{
    WELA=1;
    P0=addr;
    WELA=0;
    P0=dat;
    WELA=1;
}

void init_ds1302()
{
    uchar i;
    RST=0;
    delay(1);
    SCLK=0;
    delay(1);
    RST=1;
    delay(1);
    ds_write_byte(0x8e,0x00); //关闭写保护
    for(i=0;i<8;i++)
    {
        ds_write_byte(0x80+i,(uchar)table[0]); //初始化RAM，清零
    }
}

uchar ds_read_byte()
{
    uchar i,j,byte=0;
    for(i=0;i<8;i++)
    {
        SCLK=0;
        byte>>=1;
        if(DSIO)
        {
            byte|=0x80;
        }
        SCLK=1;
    }
    return byte;
}

void ds_write_byte(uchar dat,uchar cmd)
{
    uchar i;
    SCLK=0;
    for(i=0;i<8;i++)
    {
        DSIO=dat&0x01;
        dat>>=1;
        SCLK=1;
        SCLK=0;
    }
    SCLK=0;
    DSIO=cmd; //写入命令或数据
    SCLK=1;
    SCLK=0;
}

void read_time()
{
    uchar i,temp;
    ds_write_byte(0x8e,0x00); //关闭写保护
    temp=ds_read_byte();
    ds_write_byte(0x8e,0x80); //打开写保护
    year=ds_read_byte();
    month=ds_read_byte();
    week=ds_read_byte();
    day=ds_read_byte();
    hour=ds_read_byte();
    minute=ds_read_byte();
    second=ds_read_byte();
}

void write_time()
{
    ds_write_byte(0x8e,0x00); //关闭写保护
    ds_write_byte(0x80,0x00); //选择年
    ds_write_byte(year,0x80); //写入年
    ds_write_byte(month,0x80); //写入月
    ds_write_byte(week,0x80); //写入星期
    ds_write_byte(day,0x80); //写入日
    ds_write_byte(hour,0x80); //写入小时
    ds_write_byte(minute,0x80); //写入分钟
    ds_write_byte(second,0x80); //写入秒钟
    ds_write_byte(0x8e,0x80); //打开写保护
}

void display_time()
{
    uchar a,b,c,d;
    a=hour/10;
    b=hour%10;
    c=minute/10;
    d=minute%10;
    display(0x01,table[a]);
    display(0x02,table[b]);
    display(0x03,table[c]);
    display(0x04,table[d]);
}

void main()
{
    init_ds1302();
    while(1)
    {
        read_time();
        display_time();
        write_time();
        delay(1000);
    }
}

注：该代码仅实现了时间的显示和更新功能，如需添加其他功能，需要根据实际需求自行修改。