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#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
uchar code table[]={
0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,
0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8e
};
uchar num,temp;
void delay(uint z)//延時函數
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void main()
{
P2=0xff;
P0=0xff;
P1=0xff; //初始化
while(1)
{
P1=0xfe; //給矩陣按鍵賦初值
temp=P1;
temp=temp&0xf0; //按位與
if(temp!=0xf0) //判斷鍵盤是否按下去，如果按下去，則執行括號里的內容
{
delay(5);
temp=P1;
temp=temp&0xf0; //再次判斷
if(temp!=0xf0) //確認按下去以后，執行括號里的內容
{
temp=P1;
switch(temp)
{
case 0xee:num=1;
break;
case 0xde:num=2;
break;
case 0xbe:num=3;
break;
case 0x7e:num=4;
break;
}
P2=0;
P0=table[num-1];
}
}
P1=0xfd;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(5);
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xed:num=5;
break;
case 0xdd:num=6;
break;
case 0xbd:num=7;
break;
case 0x7d:num=8;
break;
}
P2=0;
P0=table[num-1];
}
}
P1=0xfb;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(5);
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xeb:num=9;
break;
case 0xdb:num=10;
break;
case 0xbb:num=11;
break;
case 0x7b:num=12;
break;
}
P2=0;
P0=table[num-1];
}
}
P1=0xfe;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(5);
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xe7:num=13;
break;
case 0xd7:num=14;
break;
case 0xb7:num=15;
break;
case 0x77:num=16;
break;
}
P2=0;
P0=table[num-1];
}
}
}
}
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