46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
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/***************************************************************************
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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 Rob Purchase
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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 "system.h"
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#include "kernel.h"
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#include "timer.h"
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#include "thread.h"
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void tick_start(unsigned int interval_in_ms)
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{
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/* configure Timer T-Clock to 2Mhz (clock source 4 (Xin) divided by 6) */
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PCLKCFG4 = (1 << 31) | (4 << 28) | (5 << 16);
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/* disable Timer0 */
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TCFG0 &= ~1;
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/* set counter reference value based on 1Mhz tick */
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TREF0 = interval_in_ms * 1000;
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/* Timer0 = reset to 0, divide=2, IRQ enable, enable (continuous) */
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TCFG0 = (1<<8) | (0<<4) | (1<<3) | 1;
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/* Unmask timer IRQ */
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IEN |= TIMER0_IRQ_MASK;
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}
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/* NB: Since we are using a single timer IRQ, tick tasks are dispatched as
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part of the central timer IRQ processing in timer-tcc77x.c */
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