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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing, Uwe Freese, Laurent Baum,
* Przemyslaw Holubowski
*
* 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 "i2c.h"
#include "rtc.h"
#include "kernel.h"
#include "system.h"
#include "i2c-pp.h"
#include <stdbool.h>
/*RTC_E8564's slave address is 0x51*/
#define RTC_ADDR 0x51
/* RTC registers */
#define RTC_CTRL1 0x00
#define RTC_CTRL2 0x01
#define RTC_ALARM_MINUTES 0x09
#define RTC_ALARM_HOURS 0x0A
#define RTC_ALARM_DAY 0x0B
#define RTC_ALARM_WDAY 0x0C
#define RTC_TIMER_CTRL 0x0E
#define RTC_TIMER 0x0F
/* Control 2 register flags */
#define RTC_TIE 0x01
#define RTC_AIE 0x02
#define RTC_TF 0x04
#define RTC_AF 0x08
#define RTC_TI_TP 0x10
/* Alarm registers flags */
#define RTC_AE 0x80
/* Timer register flags */
#define RTC_TE 0x80
bool rtc_lock_alarm_clear=true;
void rtc_init(void)
{
unsigned char tmp;
int rv;
/* initialize Control 1 register */
tmp = 0;
pp_i2c_send(RTC_ADDR, RTC_CTRL1, tmp);
/* read value of the Control 2 register - we'll need it to preserve alarm and timer interrupt assertion flags */
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
/* preserve alarm and timer interrupt flags */
tmp &= (RTC_TF | RTC_AF | RTC_TIE | RTC_AIE);
pp_i2c_send(RTC_ADDR, RTC_CTRL2, tmp);
}
int rtc_read_datetime(struct tm *tm)
{
int read;
unsigned char buf[7];
read = i2c_readbytes(RTC_ADDR, 0x02, sizeof(buf), buf);
/* convert from bcd, avoid getting extra bits */
tm->tm_sec = BCD2DEC(buf[0] & 0x7f);
tm->tm_min = BCD2DEC(buf[1] & 0x7f);
tm->tm_hour = BCD2DEC(buf[2] & 0x3f);
tm->tm_mday = BCD2DEC(buf[3] & 0x3f);
tm->tm_wday = BCD2DEC(buf[4] & 0x3);
tm->tm_mon = BCD2DEC(buf[5] & 0x1f) - 1;
tm->tm_year = BCD2DEC(buf[6]) + 100;
return read;
}
int rtc_write_datetime(const struct tm *tm)
{
unsigned int i;
unsigned char buf[7];
buf[0] = tm->tm_sec;
buf[1] = tm->tm_min;
buf[2] = tm->tm_hour;
buf[3] = tm->tm_mday;
buf[4] = tm->tm_wday;
buf[5] = tm->tm_mon + 1;
buf[6] = tm->tm_year - 100;
for (i = 0; i < sizeof(buf); i++)
pp_i2c_send(RTC_ADDR, 0x02 + i, DEC2BCD(buf[i]));
return 1;
}
void rtc_set_alarm(int h, int m)
{
unsigned char buf[4] = {0};
int i, rv;
/* clear alarm interrupt */
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, buf);
buf[0] &= RTC_AF;
pp_i2c_send(RTC_ADDR, RTC_CTRL2, buf[0]);
/* prepare new alarm */
if( m >= 0 )
buf[0] = DEC2BCD(m);
else
/* ignore minutes comparison query */
buf[0] = RTC_AE;
if( h >= 0 )
buf[1] = DEC2BCD(h);
else
/* ignore hours comparison query */
buf[1] = RTC_AE;
/* ignore day and wday */
buf[2] = RTC_AE;
buf[3] = RTC_AE;
/* write new alarm */
for(i = 0; i < 4; i++)
pp_i2c_send(RTC_ADDR, RTC_ALARM_MINUTES + i, buf[i]);
/* note: alarm is not enabled at the point */
}
void rtc_get_alarm(int *h, int *m)
{
unsigned char buf[4]={0};
/* get alarm preset */
i2c_readbytes(RTC_ADDR, RTC_ALARM_MINUTES, 4 ,buf);
*m = BCD2DEC(buf[0] & 0x7f);
*h = BCD2DEC(buf[0] & 0x3f);
}
bool rtc_enable_alarm(bool enable)
{
unsigned char tmp=0;
int rv=0;
if(enable)
{
/* enable alarm interrupt */
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
tmp |= RTC_AIE;
tmp &= ~RTC_AF;
pp_i2c_send(RTC_ADDR, RTC_CTRL2, tmp);
}
else
{
/* disable alarm interrupt */
if(rtc_lock_alarm_clear)
/* lock disabling alarm before it was checked whether or not the unit was started by RTC alarm */
return false;
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
tmp &= ~(RTC_AIE | RTC_AF);
pp_i2c_send(RTC_ADDR, RTC_CTRL2, tmp);
}
return false;
}
bool rtc_check_alarm_started(bool release_alarm)
{
static bool alarm_state, run_before = false;
unsigned char tmp=0;
bool started;
int rv=0;
if (run_before)
{
started = alarm_state;
alarm_state &= ~release_alarm;
}
else
{
/* read Control 2 register which contains alarm flag */
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
alarm_state = started = ( (tmp & RTC_AF) && (tmp & RTC_AIE) );
if(release_alarm && started)
{
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
/* clear alarm interrupt enable and alarm flag */
tmp &= ~(RTC_AF | RTC_AIE);
pp_i2c_send(RTC_ADDR, RTC_CTRL2, tmp);
}
run_before = true;
rtc_lock_alarm_clear = false;
}
return started;
}
bool rtc_check_alarm_flag(void)
{
unsigned char tmp=0;
int rv=0;
/* read Control 2 register which contains alarm flag */
rv = i2c_readbytes(RTC_ADDR, RTC_CTRL2, 1, &tmp);
return (tmp & RTC_AF);
}
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