keys.c

来自「嵌入式系统基础课件」· C语言 代码 · 共 40 行

#include "libepc.h"
#include "tetris.h"

#define	DOWN(key)	key
#define	UP(key)		((key) | 0x80)

#define	LEFT		0x4B
#define	RIGHT		0x4D
#define	SPACE		0x39

KEYS *GetKeys(void)
	{
	static KEYS keys = {FALSE, FALSE, FALSE} ;

	if (ScanCodeRdy()) switch (GetScanCode())
		{
		case DOWN(LEFT):
			keys.left_down = TRUE ;
			break ;
		case UP(LEFT):
			keys.left_down = FALSE ;
			break ;
		case DOWN(RIGHT):
			keys.right_down = TRUE ;
			break ;
		case UP(RIGHT):
			keys.right_down = FALSE ;
			break ;
		case DOWN(SPACE):
			keys.space_down = TRUE ;
			break ;
		case UP(SPACE):
			keys.space_down = FALSE ;
			break ;
		}

	return &keys ;
	}