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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing, Uwe Freese
*
* 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"
#include <stdbool.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);
}
#ifdef HAVE_ALARM_MOD
/* Clear Trec bit, write-protecting the RTC for 200ms when shutting off */
/* without this, the alarm won't work! */
data = rtc_read(0x04);
if (data & 0x80)
{
data &= ~0x80;
rtc_write(0x04, data);
}
rtc_enable_alarm(false);
#endif
}
#ifdef HAVE_ALARM_MOD
/* set alarm time registers to the given time (repeat once per day) */
void rtc_set_alarm(int h, int m)
{
unsigned char data;
/* for daily alarm, RPT5=RPT4=on, RPT1=RPT2=RPT3=off */
rtc_write(0x0e, 0x00); /* seconds 0 and RTP1 */
rtc_write(0x0d, ((m / 10) << 4) | (m % 10)); /* minutes and RPT2 */
rtc_write(0x0c, ((h / 10) << 4) | (h % 10)); /* hour and RPT3 */
rtc_write(0x0b, 0xc1); /* set date 01 and RPT4 and RTP5 */
/* set month to 1, if it's invalid, the rtc does an alarm every second instead */
data = rtc_read(0x0a);
data &= 0xe0;
data |= 0x01;
rtc_write(0x0a, data);
}
/* read out the current alarm time */
void rtc_get_alarm(int *h, int *m)
{
unsigned char data;
data = rtc_read(0x0c);
*h = ((data & 0x30) >> 4) * 10 + (data & 0x0f);
data = rtc_read(0x0d);
*m = ((data & 0x70) >> 4) * 10 + (data & 0x0f);
}
/* turn alarm on or off by setting the alarm flag enable */
/* the alarm is automatically disabled when the RTC gets Vcc power at startup */
/* avoid that an alarm occurs when the device is on because this locks the ON key forever */
/* returns false if alarm was set and alarm flag (output) is off */
/* returns true if alarm flag went on, which would lock the device, so the alarm was disabled again */
bool rtc_enable_alarm(bool enable)
{
unsigned char data = rtc_read(0x0a);
if (enable)
{
data |= 0xa0; /* turn bit d7=AFE and d5=ABE on */
}
else
data &= 0x5f; /* turn bit d7=AFE and d5=ABE off */
rtc_write(0x0a, data);
/* check if alarm flag AF is off (as it sould be) */
if ((rtc_read(0x0f) & 0x40) != 0) /* on */
{
data &= 0x5f; /* turn bit d7=AFE and d5=ABE off */
rtc_write(0x0a, data);
return true;
} else {
return false; /* all ok */
}
}
#endif /* HAVE_ALARM_MOD */
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;
}
int rtc_read_multiple(unsigned char address, unsigned char *buf, int numbytes)
{
int ret = 0;
unsigned char obuf[1];
int i;
i2c_begin();
obuf[0] = address;
/* send read command */
if (i2c_write(RTC_DEV_READ, obuf, 1) >= 0)
{
i2c_start();
i2c_outb(RTC_DEV_READ);
if (i2c_getack())
{
for(i = 0;i < numbytes-1;i++)
buf[i] = i2c_inb(0);
buf[i] = i2c_inb(1);
}
else
{
ret = -1;
}
}
i2c_stop();
i2c_end();
return ret;
}
#endif
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