"); //-->
#include <AT89X51.H>
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
unsigned char temp;
unsigned char key;
unsigned char i,j;
void delay()
{
for(i=10;i>0;i--)
for(j=500;j>0;j--);
}
void display()
{
P2=table[key];
}
void main(void)
{
while(1)
{
P1=0xfe;
temp=P1;
temp=temp&0xf0;
if (temp!=0xf0)
{
delay();
temp=P1;
temp=temp&0xf0;
if (temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xee:
key=0;
break;
case 0xde:
key=1;
break;
case 0xbe:
key=2;
break;
case 0x7e:
key=3;
break;
}
while(temp!=0xf0)
{
temp=P1;
temp=temp&0xf0;
}
display();
}
}
P1=0xfd;
temp=P1;
temp=temp&0xf0;
if (temp!=0xf0)
{
delay();
temp=P1;
temp=temp&0xf0;
if (temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xed:
key=4;
break;
case 0xdd:
key=5;
break;
case 0xbd:
key=6;
break;
case 0x7d:
key=7;
break;
}
while(temp!=0xf0)
{
temp=P1;
temp=temp&0xf0;
}
while(temp!=0xf0)
{
temp=P1;
temp=temp&0xf0;
}
display();
}
}
P1=0xfb;
temp=P1;
temp=temp&0xf0;
if (temp!=0xf0)
{
delay();
temp=P1;
temp=temp&0xf0;
if (temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xeb:
key=8;
break;
case 0xdb:
key=9;
break;
case 0xbb:
key=10;
break;
case 0x7b:
key=11;
break;
}
while(temp!=0xf0)
{
temp=P1;
temp=temp&0xf0;
}
display();
}
}
P1=0xf7;
temp=P1;
temp=temp&0xf0;
if (temp!=0xf0)
{
delay();
temp=P1;
temp=temp&0xf0;
if (temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xe7:
key=12;
break;
case 0xd7:
key=13;
break;
case 0xb7:
key=14;
break;
case 0x77:
key=15;
break;
}
while(temp!=0xf0)
{
temp=P1;
temp=temp&0xf0;
}
display();
}
}
}
}
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