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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#ifdef HAVE_RTC
#include "i2c.h"
#include "rtc.h"
#define RTC_ADR 0xd0
#define RTC_DEV_WRITE (RTC_ADR | 0x00)
#define RTC_DEV_READ (RTC_ADR | 0x01)
void rtc_init(void)
{
unsigned char data;
rtc_write(0x13, 0x10); /* 32 kHz square wave */
/* Clear the Stop bit if it is set */
data = rtc_read(0x01);
if(data & 0x80)
rtc_write(0x01, 0x00);
/* Clear the HT bit if it is set */
data = rtc_read(0x0c);
if(data & 0x40)
{
data &= ~0x40;
rtc_write(0x0c,data);
}
}
int rtc_write(unsigned char address, unsigned char value)
{
int ret = 0;
unsigned char buf[2];
i2c_begin();
buf[0] = address;
buf[1] = value;
/* send run command */
if (i2c_write(RTC_DEV_WRITE,buf,2))
{
ret = -1;
}
i2c_end();
return ret;
}
int rtc_read(unsigned char address)
{
int value = -1;
unsigned char buf[1];
i2c_begin();
buf[0] = address;
/* send read command */
if (i2c_write(RTC_DEV_READ,buf,1) >= 0)
{
i2c_start();
i2c_outb(RTC_DEV_READ);
if (i2c_getack())
{
value = i2c_inb(1);
}
}
i2c_stop();
i2c_end();
return value;
}
#endif
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