我这个程序有什么问题吗？为什么按键摁了之后数码管不亮？
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit dula = P2 ^ 6; //U1锁存端
sbit wela = P2 ^ 7; //U2锁存端
uchar code table[] = { 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71 };
void delayms(uint xms)
{
uint i, j;
for (i = xms; i > 0; i--)
for (j = 110; j > 0; j--);
}
void display(uchar num)
{
P0 = table[num];
dula = 1;
dula = 0;
}
void matrixkeyscan()
{
uchar temp, key;
P3 = 0xfe;
temp = P3;
temp = temp & 0xf0;
if (temp != 0xf0)
{
delayms(10);
temp = P3;
temp = temp & 0xf0;
if (temp != 0xf0)
{
temp = P3;
switch (temp)
{
case 0xee:
key = 0;
break;
case 0xde:
key = 1;
break;
case 0xbe:
key = 2;
break;
case 0x7e:
key = 3;
break;
}
while (temp != 0xfe)
{
temp = P3;
temp = temp & 0xf0;
}
display(key);
}
}
P3 = 0xfd;
temp = P3;
temp = temp & 0xf0;
if (temp != 0xf0)
{
delayms(10);
temp = P3;
temp = temp & 0xf0;
if (temp != 0xf0)
{
temp = P3;
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 = P3;
temp = temp & 0xf0;
}
display(key);
}
}
P3 = 0xfb;
temp = P3;
temp = temp & 0xf0;
if (temp != 0xf0)
{
delayms(10);
temp = P3;
temp = temp & 0xf0;
if (temp != 0xf0)
{
temp = P3;
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 = P3;
temp = temp & 0xf0;
}
display(key);
}
}
P3 = 0xf7;
temp = P3;
temp = temp & 0xf0;
if (temp != 0xf0)
{
delayms(10);
temp = P3;
temp = temp & 0xf0;
if (temp != 0xf0)
{
temp = P3;
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 = P3;
temp = temp & 0xf0;
}
display(key);
}
}
}
void main()
{
P0 = 0;
dula = 1;
dula = 0;
P0 = 0xc0;
wela = 1;
wela = 0;
while (1)
{
matrixkeyscan();
}
}
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