ba46c88c6f
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26245 a1c6a512-1295-4272-9138-f99709370657
298 lines
7.2 KiB
C
298 lines
7.2 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, Uwe Freese, Laurent Baum
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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 "i2c.h"
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#include "rtc.h"
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#include "kernel.h"
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#include "system.h"
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#include <stdbool.h>
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#define RTC_ADR 0xd0
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#define RTC_DEV_WRITE (RTC_ADR | 0x00)
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#define RTC_DEV_READ (RTC_ADR | 0x01)
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void rtc_init(void)
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{
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unsigned char data;
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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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/* Clear the Stop bit if it is set */
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data = rtc_read(0x01);
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if(data & 0x80)
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rtc_write(0x01, 0x00);
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/* Clear the HT bit if it is set */
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data = rtc_read(0x0c);
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if(data & 0x40)
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{
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data &= ~0x40;
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rtc_write(0x0c,data);
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}
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#ifdef HAVE_RTC_ALARM
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/* Clear Trec bit, write-protecting the RTC for 200ms when shutting off */
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/* without this, the alarm won't work! */
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data = rtc_read(0x04);
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if (data & 0x80)
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{
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data &= ~0x80;
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rtc_write(0x04, data);
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}
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/* Also, make sure that the OUT bit in register 8 is 1,
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otherwise the player can't be turned off. */
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rtc_write(8, rtc_read(8) | 0x80);
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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 AF, 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 AL register. This call resets AL once read.
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*
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* We're only interested if ABE is set. AL is still raised regardless
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* even if the unit is off when the alarm occurs.
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*/
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bool rtc_check_alarm_flag(void)
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{
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return ( ( (rtc_read(0x0f) & 0x40) != 0) &&
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(rtc_read(0x0a) & 0x20) );
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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 data;
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/* for daily alarm, RPT5=RPT4=on, RPT1=RPT2=RPT3=off */
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rtc_write(0x0e, 0x00); /* seconds 0 and RTP1 */
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rtc_write(0x0d, DEC2BCD(m)); /* minutes and RPT2 */
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rtc_write(0x0c, DEC2BCD(h)); /* hour and RPT3 */
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rtc_write(0x0b, 0xc1); /* set date 01 and RPT4 and RTP5 */
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/* set month to 1, if it's invalid, the rtc does an alarm every second instead */
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data = rtc_read(0x0a);
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data &= 0xe0;
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data |= 0x01;
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rtc_write(0x0a, data);
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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 data;
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data = rtc_read(0x0c);
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*h = BCD2DEC(data & 0x3f);
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data = rtc_read(0x0d);
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*m = BCD2DEC(data & 0x7f);
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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 data = rtc_read(0x0a);
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if (enable)
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{
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data |= 0xa0; /* turn bit d7=AFE and d5=ABE on */
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}
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else
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data &= 0x5f; /* turn bit d7=AFE and d5=ABE off */
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rtc_write(0x0a, data);
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/* check if alarm flag AF is off (as it should be) */
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/* in some cases enabling the alarm results in an activated AF flag */
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/* this should not happen, but it does */
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/* if you know why, tell me! */
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/* for now, we try again forever in this case */
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while (rtc_check_alarm_flag()) /* on */
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{
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data &= 0x5f; /* turn bit d7=AFE and d5=ABE off */
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rtc_write(0x0a, data);
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sleep(HZ / 10);
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rtc_check_alarm_flag();
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data |= 0xa0; /* turn bit d7=AFE and d5=ABE on */
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rtc_write(0x0a, data);
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}
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}
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#endif /* HAVE_RTC_ALARM */
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int rtc_write(unsigned char address, unsigned char value)
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{
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int ret = 0;
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unsigned char buf[2];
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i2c_begin();
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buf[0] = address;
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buf[1] = value;
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/* send run command */
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if (i2c_write(RTC_DEV_WRITE,buf,2))
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{
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ret = -1;
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}
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i2c_end();
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return ret;
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}
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int rtc_read(unsigned char address)
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{
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int value = -1;
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unsigned char buf[1];
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i2c_begin();
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buf[0] = address;
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/* send read command */
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if (i2c_write(RTC_DEV_READ,buf,1) >= 0)
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{
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i2c_start();
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i2c_outb(RTC_DEV_READ);
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if (i2c_getack())
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{
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value = i2c_inb(1);
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}
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}
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i2c_stop();
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i2c_end();
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return value;
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}
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int rtc_read_multiple(unsigned char address, unsigned char *buf, int numbytes)
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{
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int ret = 0;
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unsigned char obuf[1];
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int i;
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i2c_begin();
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obuf[0] = address;
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/* send read command */
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if (i2c_write(RTC_DEV_READ, obuf, 1) >= 0)
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{
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i2c_start();
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i2c_outb(RTC_DEV_READ);
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if (i2c_getack())
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{
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for(i = 0;i < numbytes-1;i++)
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buf[i] = i2c_inb(0);
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buf[i] = i2c_inb(1);
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}
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else
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{
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ret = -1;
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}
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}
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i2c_stop();
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i2c_end();
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return ret;
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}
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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 = rtc_read_multiple(1, 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_wday = BCD2DEC(buf[3] & 0x7);
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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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/* Adjust weekday */
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if (tm->tm_wday == 7)
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tm->tm_wday = 0;
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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 = 0;
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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;
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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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/* Adjust weekday */
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if (buf[3] == 0)
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buf[3] = 7;
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for (i = 0; i < sizeof(buf) ;i++)
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{
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rc |= rtc_write(i + 1, DEC2BCD(buf[i]));
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}
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rc |= rtc_write(8, 0x80); /* Out=1, calibration = 0 */
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return rc;
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}
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