61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id: timer.h 13806 2007-07-06 21:36:32Z jethead71 $
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*
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* Copyright (C) 2005 K<EFBFBD>vin Ferrare
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "timer.h"
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#include <SDL_timer.h>
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static int timer_prio = -1;
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void (*global_timer_callback)(void);
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SDL_TimerID timerId;
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Uint32 SDL_timer_callback(Uint32 interval, void *param){
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(void)param;
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global_timer_callback();
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return(interval);
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}
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#define cycles_to_miliseconds(cycles) \
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((int)((1000*cycles)/TIMER_FREQ))
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bool timer_register(int reg_prio, void (*unregister_callback)(void),
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long cycles, int int_prio, void (*timer_callback)(void))
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{
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(void)int_prio;/* interrupt priority not used */
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(void)unregister_callback;
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if (reg_prio <= timer_prio || cycles == 0)
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return false;
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timer_prio=reg_prio;
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global_timer_callback=timer_callback;
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timerId=SDL_AddTimer(cycles_to_miliseconds(cycles), SDL_timer_callback, 0);
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return true;
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}
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bool timer_set_period(long cycles)
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{
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SDL_RemoveTimer (timerId);
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timerId=SDL_AddTimer(cycles_to_miliseconds(cycles), SDL_timer_callback, 0);
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return true;
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}
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void timer_unregister(void)
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{
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SDL_RemoveTimer (timerId);
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timer_prio = -1;
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}
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