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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Rob Purchase
*
* 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 "config.h"
#include "system.h"
#include "kernel.h"
#include "timer.h"
#include "thread.h"
/* NB: PCK_TCT must previously have been set to 2Mhz by calling clock_init() */
void tick_start(unsigned int interval_in_ms)
{
/* disable Timer0 */
TCFG(0) &= ~TCFG_EN;
/* set counter reference value based on 1Mhz tick */
TREF(0) = interval_in_ms * 1000;
/* Timer0 = reset to 0, divide=2, IRQ enable, enable (continuous) */
TCFG(0) = TCFG_CLEAR | (0 << TCFG_SEL) | TCFG_IEN | TCFG_EN;
}
/* Timer interrupt processing - all timers (inc. tick) share a single IRQ */
void TIMER0(void)
{
if (TIREQ & TIREQ_TF0) /* Timer0 reached ref value */
{
/* Run through the list of tick tasks */
call_tick_tasks();
/* reset Timer 0 IRQ & ref flags */
TIREQ = TIREQ_TI0 | TIREQ_TF0;
}
if (TIREQ & TIREQ_TF4) /* Timer4 reached ref value */
{
/* dispatch user timer */
if (pfn_timer != NULL)
pfn_timer();
TIREQ = TIREQ_TI4 | TIREQ_TF4;
}
}
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