69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/***************************************************************************
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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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* $Id$
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*
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* Copyright (C) 2005 Jens Arnold
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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 <stdbool.h>
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#include "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "timer.h"
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#include "logf.h"
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static int timer_prio = -1;
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void SHAREDBSS_ATTR (*pfn_timer)(void) = NULL; /* timer callback */
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void SHAREDBSS_ATTR (*pfn_unregister)(void) = NULL; /* unregister callback */
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/* Register a user timer, called every <cycles> TIMER_FREQ cycles */
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bool timer_register(int reg_prio, void (*unregister_callback)(void),
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long cycles, void (*timer_callback)(void)
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IF_COP(, int core))
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{
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if (reg_prio <= timer_prio || cycles == 0)
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return false;
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if (!timer_set(cycles, true))
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return false;
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pfn_timer = timer_callback;
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/* NOTE: if unreg cb is defined you are in charge of calling timer_unregister() */
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pfn_unregister = unregister_callback;
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timer_prio = reg_prio;
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return timer_start(IF_COP(core));
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}
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bool timer_set_period(long cycles)
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{
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return timer_set(cycles, false);
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}
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/* NOTE: unregister callbacks are not called by timer_unregister()
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* the unregister_callback only gets called when your timer gets
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* overwritten by a lower priority timer using timer_register() */
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void timer_unregister(void)
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{
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timer_stop();
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pfn_timer = NULL;
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pfn_unregister = NULL;
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timer_prio = -1;
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}
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