keyboard.h

AD89C51单片机控制液晶显示器LCD1602显示时间。

/*keyboard.H file*/

#ifndef __KEYBOARD_H__
#define __KEYBOARD_H__

#include <at89x51.h>

#define ENTER		   (!(P2_4))

#define FUNCTION_KEY   (!(P2_5))
#define UP_KEY         (!(P2_6))
#define DOWN_KEY       (!(P2_7))

#define KEY_INPUT      P2
#define KEY_PIN        0xF0

#define KEY_NOTHING       0
#define KEY_FUNCTION      1
#define KEY_UP            2
#define KEY_DOWN          3
#define KEY_ENTER         4


extern unsigned char key;

void scan_keyboard(void);

#endif