f4c4221306
Instead of checking ticks, set a sticky dirty flag that indicates that the RTC needs to be read. This gives a timely update and more accurate readout without actually reading the RTC until it changes. The implementation should atomically read the flag and clear it. Setting the flag would typically happen in an RTC tick ISR. Change-Id: I6fd325f22845029a485c502c884812d3676026ea
139 lines
3.2 KiB
C
139 lines
3.2 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) 2002 by Linus Nielsen Feltzing
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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 <stdio.h> /* get NULL */
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#include "config.h"
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#include "kernel.h"
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#include "rtc.h"
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#ifdef HAVE_RTC_IRQ
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#include "rtc-target.h"
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#endif
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#include "timefuncs.h"
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#include "debug.h"
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static struct tm tm;
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#if !CONFIG_RTC
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static inline bool rtc_dirty(void)
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{
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return true;
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}
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static inline int rtc_read_datetime(struct tm *tm)
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{
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tm->tm_sec = 0;
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tm->tm_min = 0;
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tm->tm_hour = 0;
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tm->tm_mday = 1;
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tm->tm_mon = 0;
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tm->tm_year = 70;
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tm->tm_wday = 4;
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tm->tm_yday = 0;
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return 1;
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}
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#endif /* !CONFIG_RTC */
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#if CONFIG_RTC
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bool valid_time(const struct tm *tm)
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{
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if (tm->tm_hour < 0 || tm->tm_hour > 23 ||
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tm->tm_sec < 0 || tm->tm_sec > 59 ||
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tm->tm_min < 0 || tm->tm_min > 59 ||
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tm->tm_year < 100 || tm->tm_year > 199 ||
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tm->tm_mon < 0 || tm->tm_mon > 11 ||
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tm->tm_wday < 0 || tm->tm_wday > 6 ||
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tm->tm_mday < 1 || tm->tm_mday > 31)
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return false;
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else
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return true;
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}
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/* Don't read the RTC more than once per second
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* returns true if the rtc needs to be read
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* targets may override with their own implementation
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*/
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#ifndef HAVE_RTC_IRQ
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static inline bool rtc_dirty(void)
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{
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static long timeout = 0;
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/* Don't read the RTC more than once per second */
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if (TIME_AFTER(current_tick, timeout))
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{
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/* Once per second, 1/5th of a second off */
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timeout = current_tick / HZ * HZ + 6*HZ / 5;
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return true;
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}
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return false;
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}
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#endif /* HAVE_RTC_IRQ */
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#endif /* CONFIG_RTC */
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struct tm *get_time(void)
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{
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if (rtc_dirty())
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{
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rtc_read_datetime(&tm);
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tm.tm_isdst = -1; /* Not implemented for now */
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}
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return &tm;
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}
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int set_time(const struct tm *tm)
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{
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#if CONFIG_RTC
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int rc;
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if (valid_time(tm))
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{
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rc = rtc_write_datetime(tm);
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if (rc < 0)
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return -1;
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else
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return 0;
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}
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else
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{
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return -2;
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}
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#else /* No RTC */
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(void)tm;
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return -1;
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#endif /* RTC */
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}
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#if CONFIG_RTC
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void set_day_of_week(struct tm *tm)
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{
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int y=tm->tm_year+1900;
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int d=tm->tm_mday;
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int m=tm->tm_mon;
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static const char mo[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
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if(m == 0 || m == 1) y--;
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tm->tm_wday = (d + mo[m] + y + y/4 - y/100 + y/400) % 7;
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}
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#endif /* CONFIG_RTC */
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