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#include<reg52.h>
sbit dula=P2^7;
#define uchar unsigned char
#define uint unsigned int
unsigned char const dofly[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,
0x77,0x7c,0x39,0x5e,0x79,0x71};//0-F
uchar keyscan(void);//鍵盤掃描
void delay(uint i); //演示程序
void main()
{
uchar key;
P2=0x00; //1數(shù)碼管亮 按相應(yīng)的按鍵，會(huì)顯示按鍵上的字符
while(1)
{
dula=1;
key=keyscan(); //調(diào)用鍵盤掃描，
switch(key)
{
case 0x7e:P0=dofly[0];break;//0 按下相應(yīng)的鍵顯示相對(duì)應(yīng)的碼值
case 0x7d:P0=dofly[1];break;//1
case 0x7b:P0=dofly[2];break;//2
case 0x77:P0=dofly[3];break;//3
case 0xbe:P0=dofly[4];break;//4
case 0xbd:P0=dofly[5];break;//5
case 0xbb:P0=dofly[6];break;//6
case 0xb7:P0=dofly[7];break;//7
case 0xde:P0=dofly[8];break;//8
case 0xdd:P0=dofly[9];break;//9
case 0xdb:P0=dofly[10];break;//a
case 0xd7:P0=dofly[11];break;//b
case 0xee:P0=dofly[12];break;//c
case 0xed:P0=dofly[13];break;//d
case 0xeb:P0=dofly[14];break;//e
case 0xe7:P0=dofly[15];break;//f
}
}
}
uchar keyscan(void) //鍵盤掃描函數(shù)，使用行列反轉(zhuǎn)掃描法
{
uchar cord_h,cord_l;//行列值中間變量
P3=0x0f; //行線輸出全為0
cord_h=P3&0x0f; //讀入列線值
if(cord_h!=0x0f) //先檢測(cè)有無按鍵按下
{
delay(100); //去抖
if(cord_h!=0x0f)
{
cord_h=P3&0x0f; //讀入列線值
P3=cord_h|0xf0; //輸出當(dāng)前列線值
cord_l=P3&0xf0; //讀入行線值
return(cord_h+cord_l);//鍵盤最后組合碼值
}
}return(0xff); //返回該值
}
void delay(uint i) //延時(shí)函數(shù)
{
while(i--);
} | 
