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* Copyright (C) 2011 Tim Marston <tim@ed.am> and Dan Marston.
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* This file is part of propeller-clock (hereafter referred to as "this
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* program"). See http://ed.am/dev/software/arduino/propeller-clock for more
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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static int _year = 2012;
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static int _month = 5;
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static int _hours = 15;
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static int _minutes = 36;
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static int _seconds = 0;
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// milliseconds at last update
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static unsigned long _last_millis = millis();
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// milliseconds carries over from last update
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static unsigned long _carry = 0;
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static int days_in_month( int month, int year )
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return !( year % 4 ) && ( ( year % 100 ) || !( year % 400 ) )? 29 : 28;
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else if( month == 9 || month == 6 || month == 4 || month == 11 )
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void Time::load_time()
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// get the time from the real-time clock
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RTC.get( rtc_data, true );
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_year = rtc_data[ DS1307_YR ];
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_month = rtc_data[ DS1307_MTH ];
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_day = rtc_data[ DS1307_DAY ];
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_hours = rtc_data[ DS1307_HR ];
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_minutes = rtc_data[ DS1307_MIN ];
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_seconds = rtc_data[ DS1307_SEC ];
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// make sure some numbers are in range
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if( _year < YEAR_MIN || _year > YEAR_MAX ) _year = 2010;
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if( _month < 1 || _month > 12 ) _month = 1;
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if( _day < 1 || _day > days_in_month( _year, _month ) ) _day = 1;
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void Time::save_time()
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// set the time on the real-time clock
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RTC.set( DS1307_YR, _year );
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RTC.set( DS1307_MTH, _month );
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RTC.set( DS1307_DAY, _day );
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RTC.set( DS1307_HR, _hours );
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RTC.set( DS1307_MIN, _minutes );
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RTC.set( DS1307_SEC, _seconds );
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int Time::get_month()
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const char *Time::get_month_name()
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static const char *months[] = {
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return months[ _month - 1 ];
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const char *Time::get_day_suffix()
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int Time::get_hours()
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int Time::get_minutes()
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int Time::get_seconds()
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// how many milliseconds have elapsed since we last checked?
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unsigned long millis = ::millis();
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unsigned long delta = millis - _last_millis + _carry;
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// update the previous time and carried-over milliseconds
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_last_millis = millis;
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_carry = delta % 1000;
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// add the seconds that have passed to the time
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_seconds += delta / 1000;
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while( _seconds >= 60 ) {
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if( _minutes >= 60 ) {
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// We *could* manually work out the day here... but we might as
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// well ask the RTC hardware. We can't do this *all* the time
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// though, because it isn't fast enough and will actually cause
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// a minor display glitch.
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void Time::inc_hours()
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void Time::inc_minutes()
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if( ++_minutes >= 60 )
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void Time::reset_seconds()
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void Time::inc_year()
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if( ++_year >= YEAR_MAX )
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void Time::inc_month()
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if( ++_day > days_in_month( _month, _year ) )
added
removed
src/time.cc
