1/*
2    SDL - Simple DirectMedia Layer
3    Copyright (C) 1997-2012 Sam Lantinga
4
5    This library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9
10    This library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14
15    You should have received a copy of the GNU Lesser General Public
16    License along with this library; if not, write to the Free Software
17    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
18
19    Sam Lantinga
20    slouken@libsdl.org
21*/
22#include "SDL_config.h"
23
24#include "SDL_thread.h"
25#include "SDL_timer.h"
26#include "SDL_error.h"
27#include "../SDL_timer_c.h"
28
29#include <nds.h>
30
31#define timers2ms(tlow,thigh)(tlow | (thigh<<16)) >> 5
32
33
34void SDL_StartTicks(void)
35{
36   TIMER0_DATA=0;
37   TIMER1_DATA=0;
38   TIMER0_CR=TIMER_ENABLE|TIMER_DIV_1024;
39   TIMER1_CR=TIMER_ENABLE|TIMER_CASCADE;
40}
41
42Uint32 SDL_GetTicks(void)
43{
44	return timers2ms(TIMER0_DATA, TIMER1_DATA);
45}
46
47void SDL_Delay(Uint32 ms)
48{
49   Uint32 now;
50   now=timers2ms(TIMER0_DATA, TIMER1_DATA);
51   while((Uint32)timers2ms(TIMER0_DATA, TIMER1_DATA)<now+ms);
52
53}
54
55/* This is only called if the event thread is not running */
56int SDL_SYS_TimerInit(void)
57{
58	return 0;
59}
60
61void SDL_SYS_TimerQuit(void)
62{
63}
64
65int SDL_SYS_StartTimer(void)
66{
67	SDL_SetError("Timers not implemented on NDS");
68	return -1;
69}
70
71void SDL_SYS_StopTimer(void)
72{
73}
74