各位盆友，我想用lcd162显示矩阵键盘扫描值，结果一上电一直显示000000000，我是初学者，不会改 求各位大神帮忙改
#include
#define uchar unsigned char
#define uint unsigned int
unsigned char code table[]={'0','1','2','3','4','5','6','7','8',
'9','A','B','C','D','E','F'};//转换成液晶显示的字符
uchar num,temp;
sbit dula=P2^6;
sbit wela=P2^7;
sbit lcden=P2^5;
sbit lcdrs=P1^0;
sbit lcdwr=P1^1;
uchar keyscan();
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void write_com(uchar com)
{
lcdrs=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_date(uchar date)
{
lcdrs=1;
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void init ()
{
wela=0;
dula=0;
lcdwr=0;
lcden=0;
write_com(0x38);
write_com(0x0f);
write_com(0x06);
write_com(0x01);
write_com(0x80);
}
void main ()
{
init ();
while (1)
{
uchar keyscan();
write_date(table[keyscan()]);
delay(20);
}
}
uchar keyscan() //键盘扫描函数，返回一个值num
{
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;
break;
case 0xde:num=2;
break;
case 0xbe:num=3;
break;
case 0x7e:num=4;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;//必须重新读取P3口的值，否则temp将一直不等于0xf0
switch(temp)
{
case 0xed:num=5;
break;
case 0xdd:num=6;
break;
case 0xbd:num=7;
break;
case 0x7d:num=8;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
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;
break;
case 0xdb:num=10;
break;
case 0xbb:num=11;
break;
case 0x7b:num=12;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
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;
break;
case 0xd7:num=14;
break;
case 0xb7:num=15;
break;
case 0x77:num=16;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
return num;
}