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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id: timer.h 13806 2007-07-06 21:36:32Z jethead71 $
*
* Copyright (C) 2005 Kévin Ferrare
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "timer.h"
#include <SDL_timer.h>
static int timer_prio = -1;
void (*global_timer_callback)(void);
SDL_TimerID timerId;
Uint32 SDL_timer_callback(Uint32 interval, void *param){
(void)param;
global_timer_callback();
return(interval);
}
#define cycles_to_miliseconds(cycles) \
((int)((1000*cycles)/TIMER_FREQ))
bool timer_register(int reg_prio, void (*unregister_callback)(void),
long cycles, int int_prio, void (*timer_callback)(void))
{
(void)int_prio;/* interrupt priority not used */
(void)unregister_callback;
if (reg_prio <= timer_prio || cycles == 0)
return false;
timer_prio=reg_prio;
global_timer_callback=timer_callback;
timerId=SDL_AddTimer(cycles_to_miliseconds(cycles), SDL_timer_callback, 0);
return true;
}
bool timer_set_period(long cycles)
{
SDL_RemoveTimer (timerId);
timerId=SDL_AddTimer(cycles_to_miliseconds(cycles), SDL_timer_callback, 0);
return true;
}
void timer_unregister(void)
{
SDL_RemoveTimer (timerId);
timer_prio = -1;
}
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