#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
uchar num,temp;
void delay(uint z)
{
uint x,y;
for(x=z;x>=0;x--)
for(y=110;y>0;y--);
}
uint code table[]={0x3f,
0x06,0x5b,0x4f,0x66,
0x6d,0x7d,0x07,0x7f,
0x6f,0x77,0x7c,0x39,
0x5e,0x79,0x71,0x80,
0x00};
void main()
{
while(1)
{
wela=1;
P0=0xc0;
wela=0;
dula=1;
P0=0;
dula=0;
P3=0xfe;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xee:num=1; //11101110
break;
case 0xde:num=2; //11011110
break;
case 0xbe:num=3; //10111110
break;
case 0x7e:num=4; //01111110
break;
}
while (temp != 0xf0)
{
temp = P3;
temp = temp & 0xf0;
}
}
dula=1;
P0=table[num-1];
dula=0;
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xed:num=5; //11101101
break;
case 0xdd:num=6; //11011101
break;
case 0xbd:num=7; //10111101
break;
case 0x7d:num=8; //01111101
break;
}
while (temp != 0xf0)
{
temp = P3;
temp = temp & 0xf0;
}
}
dula=1;
P0=table[num-1];
dula=0;
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xeb:num=9; //11101011
break;
case 0xdb:num=10; //11011011
break;
case 0xbb:num=11; //10111011
break;
case 0x7b:num=12; //01111011
break;
}
while (temp != 0xf0)
{
temp = P3;
temp = temp & 0xf0;
}
}
dula=1;
P0=table[num-1];
dula=0;
}
P3=0xf7;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xe7:num=13; //11100111
break;
case 0xd7:num=14; //11010111
break;
case 0xb7:num=15; //10110111
break;
case 0x77:num=16; //01110111
break;
}
while (temp != 0xf0)
{
temp = P3;
temp = temp & 0xf0;
}
}
dula=1;
P0=table[num-1];
dula=0;
}
}
}
是延时函数错了，延时函数延时了5ms，导致数码管的数字被覆盖，可以延时到100us左右就可以了