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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id: timer-s5l8700.c 23103 2009-10-11 11:35:14Z theseven $
*
* Copyright (C) 2009 Bertrik Sikken
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "inttypes.h"
#include "s5l8702.h"
#include "system.h"
#include "timer.h"
void INT_TIMERF(void)
{
/* clear interrupt */
TSTAT = (0x07 << 16);
if (pfn_timer != NULL) {
pfn_timer();
}
}
bool timer_set(long cycles, bool start)
{
int tf_en = TFCMD & (1 << 0); /* save TF_EN status */
/* stop timer */
TFCMD = (0 << 0); /* TF_EN = disable */
/* optionally unregister any previously registered timer user */
if (start) {
if (pfn_unregister != NULL) {
pfn_unregister();
pfn_unregister = NULL;
}
}
/* configure timer */
TFCON = (1 << 12) | /* TF_INT0_EN */
(4 << 8) | /* TF_CS = ECLK / 1 */
(1 << 6) | /* select ECLK (12 MHz) */
(0 << 4); /* TF_MODE_SEL = interval mode */
TFPRE = 0; /* no prescaler */
TFDATA0 = cycles; /* set interval period */
/* After the configuration, we must write '1' in TF_CLR to
* initialize the timer (s5l8700 DS):
* - Clear the counter register.
* - The value of TF_START is set to TF_OUT.
* - TF_DATA0 and TF_DATA1 are updated to the internal buffers.
* - Initialize the state of the previously captured signal.
*/
TFCMD = (1 << 1) | /* TF_CLR = initialize timer */
(tf_en << 0); /* TF_EN = restore previous status */
return true;
}
bool timer_start(void)
{
TFCMD = (1 << 0); /* TF_EN = enable */
return true;
}
void timer_stop(void)
{
TFCMD = (0 << 0); /* TF_EN = disable */
}
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