src/timer/nds/SDL_systimer.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 16 Feb 2011 17:17:21 -0800
changeset 5328 f34a5f9ce9f6
parent 5270 7aba0406c273
child 5514 6bd701987ba9
permissions -rw-r--r--
Fixed bug 1122 (spinlock fails to compile with -march=armv4t)
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2011 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifdef SDL_TIMER_NDS
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#include <nds.h>
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#include <nds/timers.h>
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#include "SDL_timer.h"
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/* Will wrap afetr 49 days. Shouldn't be an issue. */
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static volatile Uint32 timer_ticks;
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static void
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NDS_TimerInterrupt(void)
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{
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    timer_ticks++;
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}
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void
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SDL_StartTicks(void)
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{
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    timer_ticks = 0;
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	/* Set timer 2 to fire every ms. */
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	timerStart(2, ClockDivider_1024, TIMER_FREQ_1024(1000), NDS_TimerInterrupt);
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}
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Uint32
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SDL_GetTicks(void)
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{
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    return timer_ticks;
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}
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void
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SDL_Delay(Uint32 ms)
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{
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    Uint32 start = SDL_GetTicks();
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    while (1) {
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        if ((SDL_GetTicks() - start) >= ms)
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            break;
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    }
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}
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#endif /* SDL_TIMER_NDS */
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