keyboard.h

会议计时器

#ifndef __KEYBOARD_H__
#define __KEYBOARD_H__

#include <at89x51.h>

#define START_KEY   (!(P1_3))
#define MIN_KEY         (!(P1_2))
#define SEC_KEY       (!(P1_1))
#define RESET_KEY       (!(P1_0))


#define KEY_INPUT      P1
#define KEY_PIN        0xF//0x07


#define KEY_NOTHING       0
#define KEY_START      4
#define KEY_MIN            3
#define KEY_SEC          2
#define KEY_RESET          1

extern unsigned char key;

void scan_keyboard(void);

#endif