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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Karl Kurbjun
*
* 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 "cpu.h"
#include "system.h"
#include "timer.h"
#include "logf.h"
/* GPB0/TOUT0 should already have been configured as output so that pin
should not be a functional pin and TIMER0 output unseen there */
void TIMER0(void) __attribute__ ((section(".icode")));
void TIMER0(void)
{
IO_INTC_IRQ0 = INTR_IRQ0_TMR0; /* clear TIMER0 interrupt */
if (pfn_timer != NULL)
pfn_timer();
}
bool timer_set(long cycles, bool start)
{
int oldlevel;
unsigned int divider=cycles, prescaler=0;
if(cycles<1)
return false;
oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
IO_CLK_MOD2 |= CLK_MOD2_TMR0; //enable TIMER0 clock!!!!!!!!!
IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP;
if (start && pfn_unregister != NULL)
{
pfn_unregister();
pfn_unregister = NULL;
}
oldlevel = disable_irq_save();
/* Increase prescale values starting from 0 to make the cycle count fit */
while(divider>65535 && prescaler<1024)
{
prescaler++;
divider=cycles/(prescaler+1);
}
IO_TIMER0_TMPRSCL = prescaler;
IO_TIMER0_TMDIV = divider;
restore_irq(oldlevel);
return true;
}
static void stop_timer(void)
{
IO_INTC_EINT0 &= ~INTR_EINT0_TMR0; //disable TIMER0 interrupt
IO_INTC_IRQ0 = INTR_IRQ0_TMR0; //clear TIMER0 interrupt
IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP;
IO_CLK_MOD2 &= ~CLK_MOD2_TMR0; //disable TIMER0 clock
}
bool timer_start(void)
{
int oldstatus = disable_interrupt_save(IRQ_FIQ_STATUS);
stop_timer();
IO_CLK_MOD2 |= CLK_MOD2_TMR0; //enable TIMER0 clock!!!!!!!!!
/* Turn Timer0 to Free Run mode */
IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_FREE_RUN;
IO_INTC_EINT0 |= INTR_EINT0_TMR0; //enable TIMER0 interrupt
restore_interrupt(oldstatus);
return true;
}
void timer_stop(void)
{
int oldstatus = disable_interrupt_save(IRQ_FIQ_STATUS);
stop_timer();
restore_interrupt(oldstatus);
}
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