一個改進型的4*4矩陣鍵盤掃描----用了SWITCH CASE 嵌套之后程序循序簡潔了好多
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar temp,num,bai,shi,ge;
uchar key[]={0x3f,0x5f,0x6f};
uchar code table[]=
{
0x3f , 0x06 , 0x5b ,
0x4f , 0x66 , 0x6d ,
0x7d , 0x07 , 0x7f ,
0x6f };
void keyscan();
void delay(uchar z);
void dsp(uchar bai,uchar shi,uchar ge);
void main()
{
while(1)
{
keyscan();
dsp(bai,shi,ge);
}
}
void delay(uchar z)
{
uchar x,y;
for(x=100;x--;x>0)
for(y=z;y--;y>0);
}
void dsp(uchar bai,uchar shi,uchar ge)
{
bai=num/100;
shi=num%100/10;
ge=num%10;
P0=0xfb;
P2=table[bai];
delay(1);
P0=0xfd;
P2=table[shi];
delay(1);
P0=0xfe;
P2=table[ge];
delay(1);
}
void keyscan()
{ uchar i;
for(i=0;i<3;i++)
{
P1=key[i];
temp=P1;
temp&=0x0f;
if(temp!=0x0f) //如果有鍵按下
{
delay(5);
temp=P1;
temp&=0x0f;
if(temp!=0x0f)//確實有鍵按下
{
switch(temp)
{
case 0x07:switch(i)
{
case 0:num=1;break;
case 1:num=5;break;
case 2:num=9;break;
};
break;
case 0x0b:switch(i)
{
case 0:num=2;break;
case 1:num=6;break;
case 2:num=10;break;
};
break;
case 0x0d:switch(i)
{
case 0:num=3;break;
case 1:num=7;break;
case 2:num=11;break;
};
break;
case 0x0e:switch(i)
{
case 0:num=4;break;
case 1:num=8;break;
case 2:num=12;break;
};;
break;
while(temp!=0xf0) //松開手后就跳出循環，否則等待松手
{
temp=P1;
temp=temp&0xf0;
dsp(bai,shi,ge);
}
}
}
}
}
}