#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit DQ=P1^0;
sbit p0_1=P0^1;
sbit p0_2=P0^2;
sbit p0_3=P0^3;
sbit p0_4=P0^4;
sbit p0_5=P0^5;
sbit p0_6=P0^6;
sbit p0_7=P0^7;
void delay(uint);
uchar reset(void);
uchar read_byte(void);
void write_byte(char val);
void delay(uint i)
{
uint j;
for(j=0;j<i;j++)
{}
}
uchar reset(void)
{
uchar a;
DQ=0;
delay(29);
DQ=1;
delay(3);
a=DQ;
delay(25);
return (a);
}
uchar read_byte(void)
{
uchar i;
uchar value=0;
for(i=0;i<8;i++)
{
value>>=1;
DQ=0;
DQ=1;
delay(1);
if(DQ)value|=0x80;
delay(6);
}
return (value);
}
void write_byte(char val)
{
uchar i;
for(i=0;i<8;i++)
{
DQ=0;
DQ=val&0x01;
delay(5);
DQ=1;
val>>=1;
}
delay(5);
}
void display_t(uchar t)
{
uint i;
uchar n[10]={0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9};
int t1,t2,t3;
t1=t/100;
t2=t/10-t1*10;
t3=t-t2*10-t1*100;
for(i=0;i<200;i++)
{
P0=0xff&n[t1];
delay(20);
P0=0xef&n[t2];
delay(20);
P0=0xdf&n[t3];
delay(20);}
}
void main(void)
{
uchar x,y,t;
while(1)
{
reset();
write_byte(0xcc);
write_byte(0x44);
reset();
write_byte(0xcc);
write_byte(0xbe);
x=read_byte();
y=read_byte();
x=x>>4;
y=y<<4;
t=x|y;
display_t(t);
}
}
