#include<reg52.h>	  //PB段碼,PA位控
#include <absacc.h>
#include <string.h>
#include <intrins.h>
#include <ctype.h>
#include <stdlib.h>
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long

/* 定義8155的I/O端口地址 */
#define COM8155 XBYTE[0xf000]                  /* 8155命令口地址 */
#define PA8155  XBYTE[0xf001]                   /* 8155的PA口地址 */
#define PB8155  XBYTE[0xf002]                   /* 8155的PB口地址 */
#define PC8155  XBYTE[0xf003]                   /* 8155的PC口地址 */

uchar key_scan(void);
void delay(uchar ms);
void proc_key(uchar key);
uchar key;

void main()
{
 

 while(1)
{

 COM8155=0x03 ;	//給8155送命令,PA,PB口都為輸出,PC口為輸入.
 key = key_scan();
 // while ((PC8155&0xcf)!=0xcf) ;  //松鍵后執(zhí)行下面程序,會(huì)出現(xiàn)數(shù)碼管按下不亮.
 proc_key(key);	//鍵盤功能

   }
}
//鍵處理子程序
/*0,1,2,3,4,5,6,7,8,9,A,b,C,d,E,F,*/
/*0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xF6,0xEE,0x3E,0x9C,0x7A,0x9E,0x8E, */
void proc_key(uchar key)
{
 switch(key)
 {
  case 0x11:PB8155=0xfc;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示0 
  case 0x12:PB8155=0x60;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示1  
  case 0x14:PB8155=0xda;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示2
  case 0x18:PB8155=0xf2;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示3  
  case 0x21:PB8155=0x66;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示4
  case 0x22:PB8155=0xb6;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示5
  case 0x24:PB8155=0xbe;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示6
  case 0x28:PB8155=0xe0;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示7
  case 0x41:PB8155=0xfe;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示8
  case 0x42:PB8155=0xf6;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示9 
  case 0x44:PB8155=0xEE;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示a 
  case 0x48:PB8155=0x3E;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示b
  case 0x81:PB8155=0x9c;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示c
  case 0x82:PB8155=0x7a;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示d
  case 0x84:PB8155=0x9E;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示e
  case 0x88:PB8155=0x8E;PA8155=0xf0;delay(10);break;   //數(shù)碼顯示f
  default: break;
 }
}
  
 /* 鍵掃描函數(shù) */
uchar key_scan(void)
{
	uchar scancode,tmpcode;
	PB8155 = 0xf0;		 // 在列行沒有接高電平發(fā)全0列掃描碼
	 PA8155=0xff;		//關(guān)閉顯示	 					
	if ((PC8155&0xcf)!=0xcf)	// 若哪行有0代表有鍵按下,PC口"1100,****"PC口7,6位沒有用默認(rèn)為高電平,5,4位不用時(shí)為0.
	{
		delay(1);							// 延時(shí)去抖動(dòng)
		if ((PC8155&0xcf)!=0xcf)				// 延時(shí)后再判斷一次，去除抖動(dòng)影響
		{
			scancode = 0xfe;	//從第一列開始發(fā)0
			while((scancode&0x10)!=0)		// 逐行掃描
			{
				PB8155 = scancode;				// 輸出列掃描碼
				if ((PC8155&0xcf)!=0xcf)		// 本行有鍵按下
				{
					tmpcode = (PC8155<<4)|0x0f;
				 
					/* 返回特征字節(jié)碼，為1的位即對(duì)應(yīng)于行和列 */
					return((~scancode)+(~tmpcode));
				}
				else scancode = (scancode<<1)|0x01;		// 行掃描碼左移一位
			}
		}
	}
	return(key);						// 無鍵按下，返回值為原來key值(這是松開鍵讓它一直執(zhí)行子程序), 如返回值為0(是按一下才執(zhí)行鍵功能程序,松開就不執(zhí)行);	
} 


//延時(shí)子程序ms級(jí)
void delay(uchar ms)
 {
   uchar i;
   while(ms--)
   {
     for(i=0;i<150;i++)
     {;}
   }//--焦建國制作
 }