ffefe0c08b
Note : SH has TIMER_FREQ defined to CPU_FREQ, so any code wanting it must include #config.h before #cpu.h git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21560 a1c6a512-1295-4272-9138-f99709370657
81 lines
2.3 KiB
C
81 lines
2.3 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 Tomasz Malesinski
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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 "system.h"
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#include "timer.h"
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static long cycles_new = 0;
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void TIMER1_ISR(void)
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{
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if (cycles_new > 0)
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{
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TIMER1.load = cycles_new - 1;
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cycles_new = 0;
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}
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if (pfn_timer != NULL)
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{
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cycles_new = -1;
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/* "lock" the variable, in case timer_set_period()
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* is called within pfn_timer() */
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pfn_timer();
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cycles_new = 0;
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}
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TIMER1.clr = 1; /* clear the interrupt */
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}
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bool timer_set(long cycles, bool start)
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{
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if (start)
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{
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if (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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TIMER1.ctrl &= ~0x80; /* disable the counter */
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TIMER1.ctrl |= 0x40; /* reload after counting down to zero */
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TIMER1.ctrl &= ~0xc; /* no prescaler */
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TIMER1.clr = 1; /* clear an interrupt event */
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}
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if (start || (cycles_new == -1)) /* within isr, cycles_new is "locked" */
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{ /* enable timer */
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TIMER1.load = cycles - 1;
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TIMER1.ctrl |= 0x80; /* enable the counter */
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}
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else
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cycles_new = cycles;
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return true;
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}
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bool timer_start(void)
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{
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irq_set_int_handler(IRQ_TIMER1, TIMER1_ISR);
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irq_enable_int(IRQ_TIMER1);
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return true;
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}
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void timer_stop(void)
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{
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TIMER1.ctrl &= ~0x80; /* disable timer 1 */
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irq_disable_int(IRQ_TIMER1);
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}
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