//矩陣鍵盤掃描程序

//采用翻轉(zhuǎn)識(shí)別法（相對(duì)代碼少一些）

#include

#define uchar unsigned char

#define uint unsigned int

uchar key=0;

//共陽(yáng)數(shù)碼管編碼如下（0-15）

uchar code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,

0xc6,0xa1,0x86,0x8e};

//函數(shù)聲明

void display(uchar Duan_value);

void delay(uchar t);

void key_scan();

void main()

{

while(1)

{

display(key);//顯示按鍵值

key_scan();//按鍵掃描

}

}

//延時(shí)函數(shù)

void delay(uchar t)

{

uchar x,y;

for(x=t;t>0;t--)

for(y=111;y>0;y--);

}

//數(shù)碼管掃描函數(shù)

void display(uchar value)

{

P2=table[value];

}

//按鍵掃描函數(shù)

void key_scan()

{

uchar m0,m1;

uchar temp;

P1=0xf0;//這樣設(shè)置是為了能使低四位將高四位拉低，釋放時(shí)自動(dòng)拉高高四位

temp=P1;

if(temp!=0xf0)

{

delay(10);//延時(shí)，去除抖動(dòng)

if(temp!=0xf0)

{

m0=temp;//獲得按鍵的列號(hào)

P1=0x0f;

temp=P1;

if(temp!=0x0f)

{

m1=temp;//獲得按鍵的行號(hào)號(hào)

temp=m0|m1;//獲得最終的號(hào)

}

switch(temp)

{

case 0xee:key=0;break;

case 0xde:key=1;break;

case 0xbe:key=2;break;

case 0x7e:key=3;break;

case 0xed:key=4;break;

case 0xdd:key=5;break;

case 0xbd:key=6;break;

case 0x7d:key=7;break;

case 0xeb:key=8;break;

case 0xdb:key=9;break;

case 0xbb:key=10;break;

case 0x7b:key=11;break;

case 0xe7:key=12;break;

case 0xd7:key=13;break;

case 0xb7:key=14;break;

case 0x77:key=15;break;

}

do{

temp=P1;//消除按起抖動(dòng)

temp&=0X0f;

}while(temp!=0x0f);

}

}

}