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SDL_systimer.c
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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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#ifdef SDL_TIMER_NDS
#include <nds.h>
#include <nds/timers.h>
#include "SDL_timer.h"
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/* Will wrap after 49 days. Shouldn't be an issue. */
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static volatile Uint32 timer_ticks;
static void
NDS_TimerInterrupt(void)
{
timer_ticks++;
}
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void
SDL_StartTicks(void)
{
timer_ticks = 0;
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/* Set timer 2 to fire every ms. */
timerStart(2, ClockDivider_1024, TIMER_FREQ_1024(1000), NDS_TimerInterrupt);
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}
Uint32
SDL_GetTicks(void)
{
return timer_ticks;
}
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Uint64
SDL_GetPerformanceCounter(void)
{
return SDL_GetTicks();
}
Uint64
SDL_GetPerformanceFrequency(void)
{
return 1000;
}
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void
SDL_Delay(Uint32 ms)
{
Uint32 start = SDL_GetTicks();
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while (1) {
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if ((SDL_GetTicks() - start) >= ms)
break;
}
}
#endif /* SDL_TIMER_NDS */
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/* vi: set ts=4 sw=4 expandtab: */