74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
|
/***************************************************************************
|
||
|
|
* __________ __ ___.
|
||
|
|
* 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)
|
||
|
|
|
||
|
|
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 run 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_end();
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|