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SDL_systimer.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 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"
#include "../SDL_timer_c.h"
#include "../SDL_systimer.h"
/* Data to handle a single periodic alarm */
static int timer_alive = 0;
static Uint32 timer_ticks;
void
SDL_StartTicks(void)
{
if (!timer_alive) {
SDL_SYS_TimerInit();
SDL_SYS_StartTimer();
}
timer_ticks = 0;
}
Uint32
SDL_GetTicks(void)
{
return timer_ticks;
}
void
SDL_Delay(Uint32 ms)
{
Uint32 start = SDL_GetTicks();
while (timer_alive) {
if ((SDL_GetTicks() - start) >= ms)
break;
}
}
static int
RunTimer(void *unused)
{
while (timer_alive) {
if (SDL_timer_running) {
}
SDL_Delay(1);
}
return (0);
}
void
NDS_TimerInterrupt(void)
{
timer_ticks++;
}
/* This is only called if the event thread is not running */
int
SDL_SYS_TimerInit(void)
{
timer_alive = 1;
timer_ticks = 0;
TIMER_CR(3) = TIMER_DIV_1024 | TIMER_IRQ_REQ;
TIMER_DATA(3) = TIMER_FREQ_1024(1000);
irqSet(IRQ_TIMER3, NDS_TimerInterrupt);
irqEnable(IRQ_TIMER3);
return 0;
}
void
SDL_SYS_TimerQuit(void)
{
if (timer_alive) {
TIMER_CR(3) = 0;
}
timer_alive = 0;
irqDisable(IRQ_TIMER3);
}
int
SDL_SYS_StartTimer(void)
{
TIMER_CR(3) |= TIMER_ENABLE;
return 0;
}
void
SDL_SYS_StopTimer(void)
{
TIMER_CR(3) &= ~TIMER_ENABLE;
return;
}
#endif /* SDL_TIMER_NDS */
/* vi: set ts=4 sw=4 expandtab: */