78 lines
1.9 KiB
C
78 lines
1.9 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) 2011 by Marcin Bukat
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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 "inttypes.h"
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#include "system.h"
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#include "timer.h"
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void INT_TIMER1(void)
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{
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/* clear interrupt */
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TMR1CON &= ~(1<<2);
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if (pfn_timer != NULL)
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{
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pfn_timer();
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}
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}
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bool timer_set(long cycles, bool start)
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{
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/* optionally unregister any previously registered timer user */
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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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}
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TMR1LR = cycles;
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TMR1CON = (1<<7) | (1<<1); /* periodic, 1/1 */
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/* unmask timer1 interrupt */
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INTC_IMR |= IRQ_ARM_TIMER1;
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/* enable timer1 interrupt */
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INTC_IECR |= IRQ_ARM_TIMER1;
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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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TMR1CON |= (1 << 8); /* timer1 enable */
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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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TMR1CON &= ~(1 << 8); /* timer1 disable */
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/* disable timer1 interrupt */
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INTC_IMR &= ~IRQ_ARM_TIMER1;
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INTC_IECR &= ~IRQ_ARM_TIMER1;
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}
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