#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit SDA=P3^7;
sbit SCL=P3^6;
uchar code table[]={0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,0};
uchar timecount,shu;
void delay()
{
uchar i;
for(i=0;i<15;i++);
;
}
void delay1(uchar i)
{
uchar j,k;
for(j=i;j>0;j--)
for(k=100;k>0;k--)
;
}
void init()
{
SDA=1;
SCL=1;
delay();
}
void start()
{
SDA=1;
SCL=1;
delay();
SDA=0;
delay();
SCL=0;
}
void stop()
{
SCL=0;
SDA=0;
delay();
SCL=1;
delay();
SDA=1;
}
void response()
{
uchar i;
SCL=0;
delay();
SCL=1;
SDA=1;
delay();
while((SDA==1)&&(i<200))
i++;
SCL=0;
}
void writedata(uchar dat)
{
uchar temp,i;
temp=dat;
SCL=0;
delay();
for(i=0;i<8;i++)
{
temp<<=1;
SDA=CY;
delay();
SCL=1;
delay();
SCL=0;
delay();
}
SDA=1;
delay();
}
uchar readdata()
{
uchar temp,i;
SCL=0;
delay();
//SDA=1;
//delay();
for(i=0;i<8;i++)
{
temp<<=1;
SCL=1;
temp=temp|SDA;
delay();
SCL=0;
delay();
}
SDA=1;
return temp;
}
void writeadd(uchar address,uchar dat)
{
start();
writedata(0xa0);
response();
writedata(address);
response();
writedata(dat);
response();
stop();
}
uchar readadd(uchar address)
{
uchar temp;
start();
writedata(0xa0);
response();
writedata(address);
response();
start();
writedata(0xa1);
response();
temp=readdata();
stop();
return temp;
}
void display(uchar x)
{
uchar i,j;
i=x/10;
j=x%10;
P2=0xfe;
P0=table[j];
delay1(5);
P2=0xff;
P0=0;
P2=0xfd;
P0=table[i];
delay1(5);
P2=0xff;
P0=0 ;
}
void main()
{
//uchar temp;
timecount=0;
TMOD=0x01;
EA=1;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
ET0=1;
TR0=1;
init();
shu=readadd(3);
//init();
//writeadd(3,0xfe);
//delay1(20);
//temp=readadd(3);
// P1=temp;
while(1)
{
display(shu);
}
}
void timer0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
timecount++;
if(timecount==20)
{
timecount=0;
shu++;
if(shu==60)
shu=0;
init();
writeadd(3,shu);
}
}
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