047174872a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1539 a1c6a512-1295-4272-9138-f99709370657
83 lines
1.8 KiB
C
83 lines
1.8 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
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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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#ifdef HAVE_RTC
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#include "i2c.h"
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#include "rtc.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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data = (unsigned int)rtc_read(0x0c);
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data &= 0xbf;
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rtc_write(0x0c,data);
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}
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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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#endif
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