bfb63f8017
The current behaviour should not change. Change-Id: Ia8f44cdccf41dbc3881722f9aebab91de51a9bc5
84 lines
2.6 KiB
C
84 lines
2.6 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: timer-s5l8700.c 23103 2009-10-11 11:35:14Z theseven $
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*
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* Copyright (C) 2009 Bertrik Sikken
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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 "s5l8702.h"
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#include "system.h"
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#include "timer.h"
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void INT_TIMERF(void)
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{
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/* clear interrupt */
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TSTAT = (0x07 << 16);
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if (pfn_timer != NULL) {
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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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int tf_en = TFCMD & (1 << 0); /* save TF_EN status */
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/* stop timer */
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TFCMD = (0 << 0); /* TF_EN = disable */
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/* optionally unregister any previously registered timer user */
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if (start) {
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if (pfn_unregister != NULL) {
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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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/* configure timer */
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TFCON = (1 << 12) | /* TF_INT0_EN */
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(4 << 8) | /* TF_CS = ECLK / 1 */
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(1 << 6) | /* select ECLK (12 MHz) */
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(0 << 4); /* TF_MODE_SEL = interval mode */
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TFPRE = 0; /* no prescaler */
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TFDATA0 = cycles; /* set interval period */
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/* After the configuration, we must write '1' in TF_CLR to
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* initialize the timer (s5l8700 DS):
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* - Clear the counter register.
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* - The value of TF_START is set to TF_OUT.
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* - TF_DATA0 and TF_DATA1 are updated to the internal buffers.
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* - Initialize the state of the previously captured signal.
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*/
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TFCMD = (1 << 1) | /* TF_CLR = initialize timer */
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(tf_en << 0); /* TF_EN = restore previous status */
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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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TFCMD = (1 << 0); /* TF_EN = 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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TFCMD = (0 << 0); /* TF_EN = disable */
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}
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