0379588361
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12789 a1c6a512-1295-4272-9138-f99709370657
165 lines
4.2 KiB
C
165 lines
4.2 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: rtc_as3514.c 12131 2007-01-27 20:48:48Z dan_a $
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*
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* Copyright (C) 2007 by Barry Wardell
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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 "rtc.h"
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#include "i2c-pp.h"
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#include <stdbool.h>
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#define MINUTE_SECONDS 60
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#define HOUR_SECONDS 3600
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#define DAY_SECONDS 86400
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#define WEEK_SECONDS 604800
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#define YEAR_SECONDS 31536000
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#define LEAP_YEAR_SECONDS 31622400
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#define BCD2DEC(X) (((((X)>>4) & 0x0f) * 10) + ((X) & 0xf))
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#define DEC2BCD(X) ((((X)/10)<<4) | ((X)%10))
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/* Days in each month */
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static unsigned int days_in_month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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static inline bool is_leapyear(int year)
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{
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if( ((year%4)==0) && (((year%100)!=0) || ((year%400)==0)) )
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return true;
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else
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return false;
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}
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void rtc_init(void)
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{
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}
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int rtc_read_datetime(unsigned char* buf)
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{
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char tmp[4];
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int year;
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int i;
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unsigned int seconds;
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/* RTC_AS3514's slave address is 0x46*/
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for (i=0;i<4;i++){
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tmp[i] = i2c_readbyte(0x46,0x2a+i);
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}
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seconds = tmp[0] + (tmp[1]<<8) + (tmp[2]<<16) + (tmp[3]<<24);
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/* Convert seconds since Jan-1-1980 to format compatible with
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* get_time() from firmware/common/timefuncs.c */
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/* weekday */
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buf[3] = ((seconds % WEEK_SECONDS) / DAY_SECONDS + 2) % 7;
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/* Year */
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year = 1980;
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while(seconds>=LEAP_YEAR_SECONDS)
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{
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year++;
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if(is_leapyear(year)){
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seconds -= LEAP_YEAR_SECONDS;
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} else {
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seconds -= YEAR_SECONDS;
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}
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}
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if(is_leapyear(year)) {
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days_in_month[1] = 29;
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} else {
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days_in_month[1] = 28;
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if(seconds>YEAR_SECONDS){
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year++;
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seconds -= YEAR_SECONDS;
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}
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}
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buf[6] = year%100;
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/* Month */
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for(i=0; i<12; i++)
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{
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if(seconds < days_in_month[i]*DAY_SECONDS){
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buf[5] = i+1;
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break;
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}
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seconds -= days_in_month[i]*DAY_SECONDS;
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}
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/* Month Day */
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buf[4] = seconds/DAY_SECONDS;
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seconds -= buf[4]*DAY_SECONDS;
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/* Hour */
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buf[2] = seconds/HOUR_SECONDS;
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seconds -= buf[2]*HOUR_SECONDS;
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/* Minute */
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buf[1] = seconds/MINUTE_SECONDS;
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seconds -= buf[1]*MINUTE_SECONDS;
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/* Second */
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buf[0] = seconds;
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/* Convert to Binary Coded Decimal format */
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for(i=0; i<7; i++)
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buf[i] = DEC2BCD(buf[i]);
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return 7;
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}
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int rtc_write_datetime(unsigned char* buf)
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{
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int i, year;
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unsigned int year_days = 0;
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unsigned int month_days = 0;
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unsigned int seconds = 0;
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/* Convert from Binary Coded Decimal format */
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for(i=0; i<7; i++)
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buf[i] = BCD2DEC(buf[i]);
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year = 2000 + buf[6];
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if(is_leapyear(year)) {
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days_in_month[1] = 29;
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} else {
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days_in_month[1] = 28;
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}
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/* Number of days in months gone by this year*/
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for(i=0; i<(buf[5]-1); i++){
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month_days += days_in_month[i];
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}
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/* Number of days in years gone by since 1-Jan-1980 */
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year_days = 365*(buf[6]+20) + buf[6]/4 + 6;
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/* Convert to seconds since 1-Jan-1980 */
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seconds = buf[0]
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+ buf[1]*MINUTE_SECONDS
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+ buf[2]*HOUR_SECONDS
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+ (buf[4]-1)*DAY_SECONDS
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+ month_days*DAY_SECONDS
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+ year_days*DAY_SECONDS;
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/* Send data to RTC */
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for (i=0;i<4;i++){
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pp_i2c_send(0x46, 0x2a+i,((seconds>>(8*i)) & 0xff));
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}
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return 1;
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}
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