#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit we = P2^7;
sbit du = P2^6;
uchar code leddata[]={
0x3F, //"0"
0x06, //"1"
0x5B, //"2"
0x4F, //"3"
0x66, //"4"
0x6D, //"5"
0x7D, //"6"
0x07, //"7"
0x7F, //"8"
0x6F, //"9"
0x77, //"A"
0x7C, //"B"
0x39, //"C"
0x5E, //"D"
0x79, //"E"
0x71, //"F"
0x76, //"H"
0x38, //"L"
0x37, //"n"
0x3E, //"u"
0x73, //"P"
0x5C, //"o"
0x40, //"-"
0x00, //熄灭
0x00 //自定义
};
void delay(uint z)
{
uint x,y;
for(x = z; x > 0; x--)
for(y = 114; y > 0 ; y--);
}
uchar KeyScan() //带返回值的子函数
{
uchar cord_l,cord_h;//声明列线和行线的值的储存变量
P3 = 0x0f;//0000 1111
if( (P3 & 0x0f) != 0x0f)//判断是否有按键按下
{
delay(5);//软件消抖
if( (P3 & 0x0f) != 0x0f)//判断是否有按键按下
{
cord_h = P3 & 0x0f;// 储存行线值
P3 = cord_l | 0xf0;
cord_l = P3 & 0xf0;// 储存列线值
while( (P3 & 0xf0) != 0xf0 );//松手检测
return (cord_l + cord_h);//返回键值码
}
}
}
void KeyPro()
{
switch( KeyScan() )
{
//第一行键值码
case 0xee: P0 = leddata[0]; break;
case 0xde: P0 = leddata[1]; break;
case 0xbe: P0 = leddata[2]; break;
case 0x7e: P0 = leddata[3]; break;
//第二行键值码
case 0xed: P0 = leddata[4]; break;
case 0xdd: P0 = leddata[5]; break;
case 0xbd: P0 = leddata[6]; break;
case 0x7d: P0 = leddata[7]; break;
//第三行键值码
case 0xeb: P0 = leddata[8]; break;
case 0xdb: P0 = leddata[9]; break;
case 0xbb: P0 = leddata[10]; break;
case 0x7b: P0 = leddata[11]; break;
//第四行键值码
case 0xe7: P0 = leddata[12]; break;
case 0xd7: P0 = leddata[13]; break;
case 0xb7: P0 = leddata[14]; break;
case 0x77: P0 = leddata[15]; break;
//独立键盘
case 0xfe: P0 = leddata[16]; break;
case 0xfd: P0 = leddata[17]; break;
case 0xfb: P0 = leddata[18]; break;
case 0xf7: P0 = leddata[19]; break;
}
}
void main()
{
we = 1;//打开位选
P0 = 0;//八位数码管全显示
we = 0;//锁存位选
du = 1;//打开段选端
P0 = leddata[22];
while(1)
{
KeyPro();//提取键值码并且送不同数值给数码管显示
}
}
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