keyboard.h

4*5矩阵键盘驱动

#ifndef _KEYBOARD_
#define _KEYBOARD_
#include <reg52.h>
#include <intrins.h>

sbit col1 = P3^7;    //P2口4行5列，高位扫描
sbit col2 = P2^0;
sbit col3 = P2^1;
sbit col4 = P2^2;
sbit col5 = P2^3;

unsigned char KBScan(void);  
void key_delay(void);

#endif