矩阵键盘键值在数码管上进行显现

#include
typedef unsigned int uint;
typedef unsigned charuchar;
sbit BEEP=P3^3;
uchar code smg_tab[]={0x28,0x7e,0xa2,0x62,0x74,0x61,0x21,0x7a,0x20,0x60,0x30,0x25,0xa9,0x26,0xa1,0Xb1};
//延时函数
void _delay_ms(uint x)
{
uchar i;
while(x–);
for(i=0;i<120;i++);
}
//蜂鸣器函数
void Beep(void)
{
uchar i;
for(i=0;i<100;i++)
{
BEEP=~BEEP;
_delay_ms(1);
}
BEEP=1;
}
//键盘扫描函数
void Scan_Key(void)
{
P1=0xfe;//PD口(11101111)第1行为低
if((P1&0xf0)!=0xf0)//假如不等于0X0F则有按下
{
_delay_ms(10);//延时10MS,去抖
if((P1&0xf0)!=0xf0)//假如TEMP不等于0X0F，则阐明有键按下
{
switch(P1)//判别TEMP的值
{
case 0xee:P2=0x7f;P0=smg_tab[0];break;
case 0xde:P2=0x7f;P0=smg_tab[1];break;
case 0xbe:P2=0x7f;P0=smg_tab[2];break;
case 0x7e:P2=0x7f;P0=smg_tab[3];break;
}
Beep();
}
}
P1=0xfd;
if((P1&0xf0)!=0xf0)
{
_delay_ms(10);
if((P1&0xf0)!=0xf0)
{
switch(P1)
{
case 0xed:P2=0x7f;P0=smg_tab[4];break;
case 0xdd:P2=0x7f;P0=smg_tab[5];break;
case 0xbd:P2=0x7f;P0=smg_tab[6];break;
case 0x7d:P2=0x7f;P0=smg_tab[7];break;
}
Beep();
}
}
P1=0xfb;
if((P1&0xf0)!=0xf0)
{
_delay_ms(10);
if((P1&0xf0)!=0xf0)
{
switch(P1)
{
case 0xeb:P2=0x7f;P0=smg_tab[8];break;
case 0xdb:P2=0x7f;P0=smg_tab[9];break;
case 0xbb:P2=0x7f;P0=smg_tab[10];break;
case 0x7b:P2=0x7f;P0=smg_tab[11];break;
}
Beep();
}
}
P1=0xf7;
if((P1&0xf0)!=0xf0)
{
_delay_ms(10);
if((P1&0xf0)!=0xf0)
{
switch(P1)
{
case 0xe7:P2=0x7f;P0=smg_tab[12];break;
case 0xd7:P2=0x7f;P0=smg_tab[13];break;
case 0xb7:P2=0x7f;P0=smg_tab[14];break;
case 0x77:P2=0x7f;P0=smg_tab[15];break;
}
Beep();
}

}

}
void main(void)
{
while(1)
{
Scan_Key();
_delay_ms(100);
}
}