程序下载到单片机上,第一行(0,1,2,3)不能显示,其余都正常,,但是其他行的我是按第一行的复制过去的,为什么其他的都行,第一行的却不行呢?求大神打救啊!!
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar code table[]={
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
sbit dula=P2^6;
sbit wela=P2^7;
void delay(uint i)
{
uint x,y;
for(x=i;x>0;x--)
for(y=110;y>0;y--);
}
void display(uchar x)
{
dula=1;
P0=table[x];
dula=0;
P0=0xff;
wela=1;
P0=0x00;
wela=0;
delay(10);
}
void keyscan()
{
uchar key,temp;
P3=0xfe;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(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!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
display(key);
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(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)
{
delay(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)
{
delay(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()
{
while(1)
{
keyscan();
}
} |