7174e88b19
should. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12196 a1c6a512-1295-4272-9138-f99709370657
165 lines
4.2 KiB
C
165 lines
4.2 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id: rtc_as3514.c 12131 2007-01-27 20:48:48Z dan_a $
|
|
*
|
|
* Copyright (C) 2007 by Barry Wardell
|
|
*
|
|
* 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 "rtc.h"
|
|
#include "i2c-pp.h"
|
|
#include <stdbool.h>
|
|
|
|
#define MINUTE_SECONDS 60
|
|
#define HOUR_SECONDS 3600
|
|
#define DAY_SECONDS 86400
|
|
#define WEEK_SECONDS 604800
|
|
#define YEAR_SECONDS 31536000
|
|
#define LEAP_YEAR_SECONDS 31622400
|
|
|
|
#define BCD2DEC(X) (((((X)>>4) & 0x0f) * 10) + ((X) & 0xf))
|
|
#define DEC2BCD(X) ((((X)/10)<<4) | ((X)%10))
|
|
|
|
/* Days in each month */
|
|
static unsigned int days_in_month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
|
|
|
|
static inline bool is_leapyear(int year)
|
|
{
|
|
if( ((year%4)==0) && (((year%100)!=0) || ((year%400)==0)) )
|
|
return true;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
void rtc_init(void)
|
|
{
|
|
}
|
|
|
|
int rtc_read_datetime(unsigned char* buf)
|
|
{
|
|
char tmp[4];
|
|
int year;
|
|
int i;
|
|
unsigned int seconds;
|
|
|
|
/* RTC_AS3514's slave address is 0x46*/
|
|
for (i=0;i<4;i++){
|
|
tmp[i] = i2c_readbyte(0x46,0x2a+i);
|
|
}
|
|
seconds = tmp[0] + (tmp[1]<<8) + (tmp[2]<<16) + (tmp[3]<<24);
|
|
|
|
/* Convert seconds since Jan-1-1980 to format compatible with
|
|
* get_time() from firmware/common/timefuncs.c */
|
|
|
|
/* weekday */
|
|
buf[3] = ((seconds % WEEK_SECONDS) / DAY_SECONDS + 1) % 7;
|
|
|
|
/* Year */
|
|
year = 1980;
|
|
while(seconds>=LEAP_YEAR_SECONDS)
|
|
{
|
|
year++;
|
|
|
|
if(is_leapyear(year)){
|
|
seconds -= LEAP_YEAR_SECONDS;
|
|
} else {
|
|
seconds -= YEAR_SECONDS;
|
|
}
|
|
}
|
|
|
|
if(is_leapyear(year)) {
|
|
days_in_month[1] = 29;
|
|
} else {
|
|
days_in_month[1] = 28;
|
|
if(seconds>YEAR_SECONDS){
|
|
year++;
|
|
seconds -= YEAR_SECONDS;
|
|
}
|
|
}
|
|
buf[6] = year%100;
|
|
|
|
/* Month */
|
|
for(i=0; i<12; i++)
|
|
{
|
|
if(seconds < days_in_month[i]*DAY_SECONDS){
|
|
buf[5] = i+1;
|
|
break;
|
|
}
|
|
|
|
seconds -= days_in_month[i]*DAY_SECONDS;
|
|
}
|
|
|
|
/* Month Day */
|
|
buf[4] = seconds/DAY_SECONDS;
|
|
seconds -= buf[4]*DAY_SECONDS;
|
|
|
|
/* Hour */
|
|
buf[2] = seconds/HOUR_SECONDS;
|
|
seconds -= buf[2]*HOUR_SECONDS;
|
|
|
|
/* Minute */
|
|
buf[1] = seconds/MINUTE_SECONDS;
|
|
seconds -= buf[1]*MINUTE_SECONDS;
|
|
|
|
/* Second */
|
|
buf[0] = seconds;
|
|
|
|
/* Convert to Binary Coded Decimal format */
|
|
for(i=0; i<7; i++)
|
|
buf[i] = DEC2BCD(buf[i]);
|
|
|
|
return 7;
|
|
}
|
|
|
|
int rtc_write_datetime(unsigned char* buf)
|
|
{
|
|
int i, year;
|
|
unsigned int year_days = 0;
|
|
unsigned int month_days = 0;
|
|
unsigned int seconds = 0;
|
|
|
|
/* Convert from Binary Coded Decimal format */
|
|
for(i=0; i<7; i++)
|
|
buf[i] = BCD2DEC(buf[i]);
|
|
|
|
year = 2000 + buf[6];
|
|
|
|
if(is_leapyear(year)) {
|
|
days_in_month[1] = 29;
|
|
} else {
|
|
days_in_month[1] = 28;
|
|
}
|
|
|
|
/* Number of days in months gone by this year*/
|
|
for(i=0; i<(buf[5]-1); i++){
|
|
month_days += days_in_month[i];
|
|
}
|
|
|
|
/* Number of days in years gone by since 1-Jan-1980 */
|
|
year_days = 365*(buf[6]+20) + buf[6]/4 + 6;
|
|
|
|
/* Convert to seconds since 1-Jan-1980 */
|
|
seconds = buf[0]
|
|
+ buf[1]*MINUTE_SECONDS
|
|
+ buf[2]*HOUR_SECONDS
|
|
+ (buf[4]-1)*DAY_SECONDS
|
|
+ month_days*DAY_SECONDS
|
|
+ year_days*DAY_SECONDS;
|
|
|
|
/* Send data to RTC */
|
|
for (i=0;i<4;i++){
|
|
pp_i2c_send(0x46, 0x2a+i,((seconds>>(8*i)) & 0xff));
|
|
}
|
|
return 1;
|
|
}
|
|
|