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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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_state( digitalRead( pin )? false : true ),
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_state_millis( ::millis() ),
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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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// get state and check for change
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bool state = digitalRead( _pin )? false : true;
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_state_millis = millis;
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// if button has been pressed for any amount of time
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if( state && millis > _state_millis )
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// calculate new duration for this state
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unsigned long duration = millis - _state_millis;
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// check through events to see if the button has been
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// pressed long enough to trigger one
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for( int a = 0; _event_times[ a ]; a++ )
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// if this event is in the future, we can stop looking
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if( duration < (unsigned long)_event_times[ a ] )
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// if this event happened since the previous update, we
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if( _state_duration < (unsigned long)_event_times[ a ] )
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_pending_event = a + 1;
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// update the duration we've accounted for
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_state_duration = duration;
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int Button::get_event()
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int event = _pending_event;