key.h

扫描按键的程序

extern unsigned char KEY1_JUDGE();		 //各按键状态判断
extern unsigned char KEY2_JUDGE();
extern unsigned char KEY3_JUDGE();
extern unsigned char KEY4_JUDGE();

#define NOP 3							 //宏定义
#define LONG_PRESS 2
#define SHORT_PRESS 1
#define NO_PRESS 0