gbasys

view src/input.c @ 8:047c61960005

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- added bg2 matrix support - changed some stupid const pointers to register addresses to hardcoded compile-time defines
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 22 Jun 2014 06:26:11 +0300
parents 06726f0b8cd3
children 85f219fcdc82
line source
1 /*
2 Copyright 2004-2012 John Tsiombikas <nuclear@member.fsf.org>
3
4 This file is part of gbasys, a library for GameBoy Advance development.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include "input.h"
22
23 #define REG_KEYSTATE (*(unsigned short*)0x4000130)
24 #define REG_KEYCTL (*(unsigned short*)0x4000132)
25
26 int get_key_state(int key) {
27 int res;
28 unsigned short prev_mask;
29
30 prev_mask = REG_KEYCTL;
31 disable_key_interrupts(key);
32
33 res = ~REG_KEYSTATE & key;
34 REG_KEYCTL = prev_mask;
35 return res;
36 }
37
38 void enable_key_interrupts(int keys) {
39 REG_KEYCTL |= (1 << 14) | keys;
40 }
41
42 void disable_key_interrupts(int keys) {
43 if(keys == KEY_ALL) keys |= (1 << 14);
44 REG_KEYCTL ^= keys;
45 }