矩阵键盘简单使用

#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit SER = P2^0;
sbit SRCLK = P2^1;
sbit SRCLR = P2^2;
sbit RRCLK =  P2^3;
sbit E = P2^4;
uchar table595[16]={0x30,0x7e,0x29,0x2c,0x66,0xa4,0xa0,0x3e,0x20,0x24,0x22,0xe0,0xb1,0x68,0xa1,0xa3};
void delay(uchar z)
{
uchar x,y;
for(x=0;x<110;x++)
for(y=0;y<z;y++);
}
uchar keyscan()//矩阵键盘扫描程序
{
uchar num,temp;
while(1)
{
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=0;
break;
case 0xde:num=1;
break;
case 0xbe:num=2;
break;
case 0x7e:num=3;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
return num;
}
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xed:num=4;
break;
case 0xdd:num=5;
break;
case 0xbd:num=6;
break;
case 0x7d:num=7;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
return num;
}
}
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=8;
break;
case 0xdb:num=9;
break;
case 0xbb:num=10;
break;
case 0x7b:num=11;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
return num;
}
}
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=12;
break;
case 0xd7:num=13;
break;
case 0xb7:num=14;
break;
case 0x77:num=15;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
return num;
}
}
}
}
void X74HC595(uchar j)
{
uchar i,temp;
E = 1;
_nop_();
_nop_();
E = 0;
SRCLR = 1;
temp=table595[j];
for(i=0;i<8;i++)
{
temp=_crol_(temp,1);
SER = temp & 0x80; //p2.0连J9的1口
SRCLK = 0;
_nop_();
SRCLK = 1;
_nop_();
RRCLK= 0;
_nop_();
RRCLK = 1;
_nop_();
}
}
void main()
{
uchar p;
while(1)
{
p=keyscan();
X74HC595(p);
}
}