電路圖很簡單就不畫了，電路的接法是p1口接矩陣鍵盤，p3口接獨立鍵盤，8個led燈接在p0口上的.
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
#define on 0
#define off 1
sbit led1=P0^0;
sbit led2=P0^1;
sbit led3=P0^2;
sbit led4=P0^3;
sbit led5=P0^4;
sbit led6=P0^5;
sbit led7=P0^6;
sbit led8=P0^7;
sbit key1=P3^0;
sbit key2=P3^1;
sbit key3=P3^2;
sbit key4=P3^3;
sbit key5=P3^4;
sbit key6=P3^5;
sbit key7=P3^6;
sbit key8=P3^7;
void delay_ms(uchar time)
{
uchar i,j;
for(i=time;i>0;i--)
{
for(j=85;j>0;j++)
{;}
}
}
uchar scan_key()
{
//uchar i,j;
//P3=0xff;
if((P3&0xff)!=0xff)
{
delay_ms(30);
if((P3&0xff)!=0xff)
{
if(key1==0)
return(1);
if(key2==0)
return(2);
if(key3==0)
return(3);
if(key4==0)
return(4);
if(key5==0)
return(5);
if(key6==0)
return(6);
if(key7==0)
return(7);
if(key8==0)
return(8);
}
}
return 0;
}
void main(void)
{
uchar key_value;
key_value=scan_key();
switch(key_value)
{
case 1:led1=on;break;
case 2:led2=on;break;
case 3:led3=on;break;
case 4:led4=on;break;
case 5:led5=on;break;
case 6:led6=on;break;
case 7:led7=on;break;
case 8:led8=on;break;
default:P0=0xff;
}
}
4*4行列式矩陣鍵盤
#include<reg52.h>
sbit led1 =P0^0 ;
sbit led2 =P0^1 ;
sbit led3 =P0^2 ;
sbit led4 =P0^3 ;
sbit led5 =P0^4 ;
sbit led6 =P0^5 ;
sbit led7 =P0^6 ;
sbit led8 =P0^7 ;
#define on 0
#define off 1
#define uchar unsigned char
#define uint unsigned int
void delay_ms(uint time)
{
uint i,j;
for(i=time;i>0;i--)
for(j=112;j>0;j--)
{}
}
//d/*
uchar s_scan(void)
{
uchar scan_code,temp;
P1=0xf0;
if((P1&0xf0)!=0x0f)
{
delay_ms(30);
if((P1&0xf0)!=0xf0)
{
scan_code=0xfe;
while((scan_code&0x10)!=0)
{
P1=scan_code;
if((P1&0xf0)!=0xf0)
{
temp=(P1&0xf0)|0x0f;
while((P1&0xf0)!=0xf0)
return ((~scan_code)+(~temp));
}
else
scan_code=(scan_code<<1)|0x01;
}
}
}
return 0;
}
//*/
/*
uchar s_scan(void)
{
uchar scanh,scanl;
P1=0xf0;
if((P1&0xf0)!=0xf0)
{
P1=0xf0;
delay_ms(30);
if((P1&0xf0)!=0xf0)
{
P1=0xfe ;
//P1=scanh;
if((P1&0xf0)!=0xf0)
{
P1&=0xf0;
if(P1==0xe0)
return(1);
if(P1==0xd0)
return(2);
if(P1==0xb0)
return(3);
if(P1==0x70)
return(4);
}
P1=0xfd;
if((P1&0xf0)!=0xf0)
{
P1&=0xf0;
if(P1==0xe0)
return(5);
if(P1==0xd0)
return(6);
if(P1==0xb0)
return(7);
if(P1==0x70)
return(8);
}
P1=0xfb;
if((P1&0xf0)!=0xf0)
{
P1&=0xf0;
if(P1==0xe0)
return(9);
if(P1==0xd0)
return(10);
if(P1==0xb0)
return(11);
if(P1==0x70)
return(12);
}
P1=0xf7;
if((P1&0xf0)!=0xf0)
{
P1&=0xf0;
if(P1==0xe0)
return(13);
if(P1==0xd0)
return(14);
if(P1==0xb0)
return(15);
if(P1==0x70)
return(16);
}
}
}
return 0;
}
*/
void main(void)
{
uchar key_code;
while(1)
{
key_code=s_scan();
if(key_code)
P0=key_code;
/*
delay_ms(300);
led1=~led1;
delay_ms(300);
switch(key_code)
{
case 1:led1=on;break;
case 2:led2=on;break;
case 3:led3=on;break;
case 4:led4=on;break;
case 5:led5=on;break;
case 6:led6=on;break;
case 7:led7=on;break;
case 8:led8=on;break;
default:P0=0xff;
}
*/
}
}