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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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Button::Button( int pin )
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_last_real_state( false ),
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_millis_real_state( 0 )
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void Button::set_event_times( int event_times[] )
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_event_times = event_times;
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unsigned long millis = ::millis();
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bool real_state = digitalRead( _pin )? false : true;
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// if real state has changed, reset the timer
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if( real_state != _last_real_state ) {
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_last_real_state = real_state;
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_millis_real_state = millis;
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// work out current state; if the real state timer has elapsed, set our
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// state to real state
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if( _last_real_state != state && millis - _millis_real_state > 15 )
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state = _last_real_state;
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// if the button is pressed
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// if it has just been pressed, record the time now and reset how much
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// of the press we have already generated events for
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_millis_state = millis;
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// calculate time that has elapsed in total this press
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unsigned long elapsed = millis - _millis_state;
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// look through the events to see if any need to be triggered
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for( int a = 0; _event_times[ a ]; a++ )
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// if this event is in the future, stop
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if( (unsigned)_event_times[ a ] > elapsed ) break;
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// if this event has already been triggered, skip
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if( (unsigned)_event_times[ a ] <= _millis_done ) continue;
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_pending_event = a + 1;
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// update the amount of press we have processed
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_millis_done = elapsed;
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int Button::get_event()
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int event = _pending_event;
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bool Button::get_state()