4×4矩陣式鍵盤（非中斷）源程序

#include

#define uchar unsigned char

#define uint unsigned int

uchar code table[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xFF};

uchar temp;

uchar key;

uchar k;

uchar code_h;

//延時(shí)函數(shù)

void mDelay(uchar Delay)

{ uchar i;

for(;Delay>0;Delay--)

{ for(i=0;i<124;i++)

{;}

}

}

void keyc(void);

//主函數(shù)

void main(void)

{

P2_0=0;

while(1)

{

code_h=0xef;

P3=code_h;

temp=P3;

while(temp==code_h)//檢測(cè)鍵盤是否有按鍵按下

{

code_h=(code_h<<1)|0x01;

if(code_h==0xff)

{code_h=0xef;}

P3=code_h;

temp=P3;

}

mDelay(5); //延時(shí)去抖

if(P3==temp)

{

keyc();

while(temp==P3) //等待按鍵放開

{;}

}

}

}

//鍵盤操作

void keyc(void)

{

switch(temp)

{

case 0xee:

key=10;

break;

case 0xed:

key=0;

break;

case 0xeb:

key=11;

break;

case 0xe7:

key=12;

break;

case 0xde:

key=1;

break;

case 0xdd:

key=2;

break;

case 0xdb:

key=3;

break;

case 0xd7:

key=13;

break;

case 0xbe:

key=4;

break;

case 0xbd:

key=5;

break;

case 0xbb:

key=6;

break;

case 0xb7:

key=14;

break;

case 0x7e:

key=7;

break;

case 0x7d:

key=8;

break;

case 0x7b:

key=9;

break;

case 0x77:

key=15;

break;

}

P0=table[key];

}