config.h

这里很详细地将了怎样编写一个4*4的行列扫描式键盘（它已经通过keil编译并使用）。该程序利用P1口作为行列扫描端口,它能够识别是否有多键按下

#include<reg52.h>
#include"absacc.h"
//数据类型定义
typedef unsigned char int8u;
typedef signed char int8s;
typedef unsigned int int16u;
typedef signed int int16s;
typedef unsigned long int32u;
typedef signed long int32s;


#define  outport(addr,dat)  XBYTE[addr]=dat
#define  inport(addr)  XBYTE[addr]


sbit P10=P1^0;
sbit P11=P1^1;
sbit P12=P1^2;
sbit P13=P1^3;
sbit P14=P1^4;
sbit P15=P1^5;
sbit P16=P1^6;
sbit P17=P1^7;

sbit P30=P3^0;
sbit P31=P3^1;
sbit P32=P3^2;
sbit P33=P3^3;
sbit P34=P3^4;
sbit P35=P3^5;
sbit P36=P3^6;
sbit P37=P3^7;