forked from len0rd/rockbox
af395f4db6
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16811 a1c6a512-1295-4272-9138-f99709370657
98 lines
2.4 KiB
C
98 lines
2.4 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) 2007 by Karl Kurbjun
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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 "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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/* GPB0/TOUT0 should already have been configured as output so that pin
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should not be a functional pin and TIMER0 output unseen there */
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void TIMER0(void)
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{
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if (pfn_timer != NULL)
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pfn_timer();
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IO_INTC_IRQ0 |= 1<<IRQ_TIMER0;
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}
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bool __timer_set(long cycles, bool start)
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{
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int oldlevel;
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unsigned int divider=cycles, prescaler=0;
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if(cycles<1)
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return false;
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IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP;
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if (start && pfn_unregister != NULL)
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{
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pfn_unregister();
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pfn_unregister = NULL;
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}
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oldlevel = disable_irq_save();
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/* Increase prescale values starting from 0 to make the cycle count fit */
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while(divider>65535 && prescaler<1024)
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{
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prescaler++;
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divider=cycles/(prescaler+1);
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}
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IO_TIMER0_TMPRSCL = prescaler;
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IO_TIMER0_TMDIV = divider;
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restore_irq(oldlevel);
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return true;
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}
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static void stop_timer(void)
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{
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IO_INTC_EINT0 &= ~(1<<IRQ_TIMER0);
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IO_INTC_IRQ0 |= 1<<IRQ_TIMER0;
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IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP;
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}
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bool __timer_register(void)
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{
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int oldstatus = set_interrupt_status(IRQ_FIQ_DISABLED, IRQ_FIQ_STATUS);
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stop_timer();
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/* Turn Timer0 to Free Run mode */
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IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_FREE_RUN;
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IO_INTC_EINT0 |= 1<<IRQ_TIMER0;
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set_interrupt_status(oldstatus, IRQ_FIQ_STATUS);
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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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int oldstatus = set_interrupt_status(IRQ_FIQ_DISABLED, IRQ_FIQ_STATUS);
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stop_timer();
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set_interrupt_status(oldstatus, IRQ_FIQ_STATUS);
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}
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