#include<reg52.h>
typedef unsigned char uint8;
typedef unsigned int uint16;
sbit duan=P2^5; //数码管段选
sbit wei=P2^6; //数码管位选
sbit SCK=P3^0; //时钟线
sbit SIO=P3^1; //数据线
sbit RST=P3^2; //复位线
uint8 miao,fen,shi,miao1,miao2,fen1,fen2,shi1,shi2;
uint8 cun[7];
const uint8 zifu[]={ 0xc0,0xf9,0xa4,0xb0,
0x99,0x92,0x82,0xf8,
0x80,0x90};
void delay(uint8 z)//延时函数
{
uint8 x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void xianshi(uint8 miao,uint8 fen,uint8 shi) //显示始终时间的子程序
{
miao1=miao/10;
miao2=miao%10;
fen1=fen/10;
fen2=fen%10;
shi1=shi/10;
shi2=shi%10;
wei=1;
P0=0x80;
wei=0;
duan=1;
P0=zifu[miao2];
duan=0;
P0=0x00;
delay(5);
wei=1;
P0=0x40;
wei=0;
duan=1;
P0=zifu[miao1];
duan=0;
P0=0x00;
delay(5);
wei=1;
P0=0x20;
wei=0;
duan=1;
P0=0xbf;
duan=0;
P0=0x00;
delay(5);
wei=1;
P0=0x10;
wei=0;
duan=1;
P0=zifu[fen2];
duan=0;
P0=0x00;
delay(5);
wei=1;
P0=0x08;
wei=0;
duan=1;
P0=zifu[fen1];
duan=0;
P0=0x00;
delay(5);
wei=1;
P0=0x04;
wei=0;
duan=1;
P0=0xbf;
duan=0;
P0=0x00;
delay(5);
wei=1;
P0=0x02;
wei=1;
duan=1;
P0=zifu[shi2];
duan=0;
P0=0x00;
delay(10);
wei=1;
P0=0x01;
wei=0;
duan=1;
P0=zifu[shi1];
duan=0;
P0=0x00;
delay(10);
}
void fuwei() //1302复位
{
RST=0;
SCK=0;
RST=0;
}
void xieru(uint8 dat) //写入一个字节
{
uint8 i;
SCK=0;
for(i=0;i<8;i++)
{
SIO=dat&0x01;
SCK=1;
dat>>=1;
SCK=0;
}
}
uint8 duchu()//读出一个字节
{
uint8 i,dat=0;
for(i=0;i<8;i++)
{
dat>>=1;
if(SIO)
dat|=0x80;
SCK=1;
SCK=0;
}
return dat;
}
void qingbaohu() //清除写保护
{
fuwei();
RST=1;
xieru(0x8e);
xieru(0);
SIO=0;
RST=0;
}
void shebaohu() //设置写保护
{
fuwei();
RST=1;
xieru(0x8e);
xieru(0x80);
SIO=0;
RST=0;
}
void xieru1302(uint8 addr,uint8 dat) //写入ds1302
{
fuwei();
RST=1;
xieru(addr);
xieru(dat);
SIO=0;
RST=0;
}
uint8 duchu1302(uint8 addr) //读出1302
{
uint8 temp=0;
fuwei();
RST=1;
xieru(addr);
temp=duchu();
SIO=0;
RST=0;
return(temp);
}
void sheshijian() //1302初始设置
{
uint8 p;
p=duchu1302(0x81);
if(p&0x80)
{
qingbaohu();
xieru1302(0x80,((45/10)<<4)|(45%10));
xieru1302(0x82,((44/10)<<4)|(44%10));
xieru1302(0x84,((22/10)<<4)|(22%10));
shebaohu();
}
}
void dushijian() //读出1302时间
{
cun[0]=duchu1302(0x81); //秒
cun[1]=duchu1302(0x83); //分
cun[2]=duchu1302(0x85); //时
}
void main()
{
sheshijian();
while(1)
{
dushijian();
miao=cun[0]/16*10+cun[0]%16;
fen=cun[1]/16*10+cun[1]%16;
shi=cun[2]/16*10+cun[2]%16;
xianshi( miao,fen, shi);
}
}
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