159 lines
4.4 KiB
C
159 lines
4.4 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) 2006 by Robert Kukla
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* based on Archos code by Linus Nielsen Feltzing, Uwe Freese, Laurent Baum
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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 "rtc.h"
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#include "logf.h"
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#include "sw_i2c.h"
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#include "timefuncs.h"
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#define RTC_ADDR 0xD0
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void rtc_init(void)
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{
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sw_i2c_init();
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#ifdef HAVE_RTC_ALARM
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/* Check + save alarm bit first, before the power thread starts watching */
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rtc_check_alarm_started(false);
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#endif
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}
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#ifdef HAVE_RTC_ALARM
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/* check whether the unit has been started by the RTC alarm function */
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/* (check for A2F, which => started using wakeup alarm) */
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bool rtc_check_alarm_started(bool release_alarm)
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{
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static bool alarm_state, run_before;
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bool rc;
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if (run_before) {
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rc = alarm_state;
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alarm_state &= ~release_alarm;
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} else {
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/* This call resets AF, so we store the state for later recall */
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rc = alarm_state = rtc_check_alarm_flag();
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run_before = true;
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}
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return rc;
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}
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/*
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* Checks the A2F flag. This call resets A2F once read.
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*
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*/
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bool rtc_check_alarm_flag(void)
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{
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unsigned char buf[1];
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bool flag = false;
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sw_i2c_read(RTC_ADDR, 0x0f, buf, 1);
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if (buf[0] & 0x02) flag = true;
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buf[0] = 0x00;
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sw_i2c_write(RTC_ADDR, 0x0f, buf, 1);
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return flag;
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}
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/* set alarm time registers to the given time (repeat once per day) */
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void rtc_set_alarm(int h, int m)
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{
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unsigned char buf[3];
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buf[0] = (((m / 10) << 4) | (m % 10)) & 0x7f; /* minutes */
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buf[1] = (((h / 10) << 4) | (h % 10)) & 0x3f; /* hour */
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buf[2] = 0x80; /* repeat every day */
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sw_i2c_write(RTC_ADDR, 0x0b, buf, 3);
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}
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/* read out the current alarm time */
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void rtc_get_alarm(int *h, int *m)
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{
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unsigned char buf[2];
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sw_i2c_read(RTC_ADDR, 0x0b, buf, 2);
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*m = ((buf[0] & 0x70) >> 4) * 10 + (buf[0] & 0x0f);
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*h = ((buf[1] & 0x30) >> 4) * 10 + (buf[1] & 0x0f);
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}
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/* turn alarm on or off by setting the alarm flag enable */
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/* the alarm is automatically disabled when the RTC gets Vcc power at startup */
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/* avoid that an alarm occurs when the device is on because this locks the ON key forever */
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void rtc_enable_alarm(bool enable)
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{
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unsigned char buf[2];
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buf[0] = enable ? 0x26 : 0x24; /* BBSQI INTCN A2IE vs INTCH only */
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buf[1] = 0x00; /* reset alarm flags (and OSF for good measure) */
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sw_i2c_write(RTC_ADDR, 0x0e, buf, 2);
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}
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#endif /* HAVE_RTC_ALARM */
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int rtc_read_datetime(struct tm *tm)
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{
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int rc;
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unsigned char buf[7];
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rc = sw_i2c_read(RTC_ADDR, 0, buf, sizeof(buf));
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/* convert from bcd, avoid getting extra bits */
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tm->tm_sec = BCD2DEC(buf[0] & 0x7f);
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tm->tm_min = BCD2DEC(buf[1] & 0x7f);
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tm->tm_hour = BCD2DEC(buf[2] & 0x3f);
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tm->tm_mday = BCD2DEC(buf[4] & 0x3f);
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tm->tm_mon = BCD2DEC(buf[5] & 0x1f) - 1;
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tm->tm_year = BCD2DEC(buf[6]) + 100;
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set_day_of_week(tm);
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set_day_of_year(tm);
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return rc;
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}
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int rtc_write_datetime(const struct tm *tm)
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{
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unsigned int i;
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int rc;
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unsigned char buf[7];
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buf[0] = tm->tm_sec;
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buf[1] = tm->tm_min;
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buf[2] = tm->tm_hour;
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buf[3] = tm->tm_wday + 1; /* chip wants 1..7 for wday */
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buf[4] = tm->tm_mday;
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buf[5] = tm->tm_mon + 1;
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buf[6] = tm->tm_year - 100;
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for (i = 0; i < sizeof(buf); i++)
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buf[i] = DEC2BCD(buf[i]);
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buf[5] |= 0x80; /* chip wants century (always 20xx) */
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rc = sw_i2c_write(RTC_ADDR, 0, buf, sizeof(buf));
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return rc;
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}
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