f62388f82c
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21486 a1c6a512-1295-4272-9138-f99709370657
62 lines
2 KiB
C
62 lines
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) 2008 by Rob Purchase
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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 "config.h"
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#include "system.h"
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#include "kernel.h"
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#include "timer.h"
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#include "thread.h"
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/* NB: PCK_TCT must previously have been set to 2Mhz by calling clock_init() */
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void tick_start(unsigned int interval_in_ms)
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{
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/* disable Timer0 */
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TCFG(0) &= ~TCFG_EN;
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/* set counter reference value based on 1Mhz tick */
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TREF(0) = interval_in_ms * 1000;
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/* Timer0 = reset to 0, divide=2, IRQ enable, enable (continuous) */
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TCFG(0) = TCFG_CLEAR | (0 << TCFG_SEL) | TCFG_IEN | TCFG_EN;
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}
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/* Timer interrupt processing - all timers (inc. tick) share a single IRQ */
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void TIMER0(void)
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{
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if (TIREQ & TIREQ_TF0) /* Timer0 reached ref value */
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{
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/* Run through the list of tick tasks */
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call_tick_tasks();
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/* reset Timer 0 IRQ & ref flags */
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TIREQ = TIREQ_TI0 | TIREQ_TF0;
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}
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if (TIREQ & TIREQ_TF4) /* Timer4 reached ref value */
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{
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/* dispatch user timer */
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if (pfn_timer != NULL)
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pfn_timer();
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TIREQ = TIREQ_TI4 | TIREQ_TF4;
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}
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}
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