d63a8fcb7b
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20419 a1c6a512-1295-4272-9138-f99709370657
96 lines
2.3 KiB
C
96 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) 2008 by Maurus Cuelenaere
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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 "jz4740.h"
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#include "system.h"
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#include "timer.h"
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/* Interrupt handler */
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void TCU1(void)
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{
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__tcu_clear_full_match_flag(1);
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if (pfn_timer != NULL)
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pfn_timer();
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}
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/* TODO: figure out what cycles means */
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bool __timer_set(long cycles, bool start)
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{
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unsigned int latch, old_irq;
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if(cycles < 1)
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return false;
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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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old_irq = disable_irq_save();
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__tcu_stop_counter(1);
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__tcu_disable_pwm_output(1);
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__tcu_mask_half_match_irq(1);
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__tcu_unmask_full_match_irq(1);
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/* EXTAL clock = 12Mhz */
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__tcu_select_extalclk(1);
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/* 12Mhz / 4 = 3Mhz */
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__tcu_select_clk_div4(1);
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latch = cycles;
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REG_TCU_TCNT(1) = 0;
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REG_TCU_TDFR(1) = latch;
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REG_TCU_TDHR(1) = latch;
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__tcu_clear_full_match_flag(1);
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system_enable_irq(IRQ_TCU1);
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restore_irq(old_irq);
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return true;
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}
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bool __timer_register(void)
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{
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unsigned int old_irq = disable_irq_save();
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__tcu_start_counter(1);
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restore_irq(old_irq);
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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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unsigned int old_irq = disable_irq_save();
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__tcu_stop_counter(1);
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restore_irq(old_irq);
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}
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