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  • Committer: edam
  • Date: 2011-11-04 13:48:15 UTC
  • Revision ID: edam@waxworlds.org-20111104134815-kj7qdhqfbxaj1tng
finished writing up electronics notes

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src/button.cc
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#include <Arduino.h>
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#include <button.h>
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Button::Button( int pin )
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        :
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        _pin( pin ),
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        _last_state( digitalRead( pin )? true : false ),
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        _last_millis( millis() )
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{
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}
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void Button::add_event_at( int duration, int event_id )
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{
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        _press_events[ duration ] = event_id;
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}
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int Button::update()
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{
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        // reset event
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        _event_id = 0;
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        // get time
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        int millis = ::millis();
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        // get state and check for change
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        bool state = digitalRead( _pin )? true : false;
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        if( state != _last_state )
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        {
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                // if the button has become unpressed
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                if( !state )
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                {
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                        // check through events to see if it had been pressed long enough
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                        // to trigger one
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                        int duration = millis - _last_millis;
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                        for( std::map< int, int >::iterator i = _press_events.begin();
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                                 i != _press_events.end(); i++ )
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                        {
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                                if( duration > i->first )
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                                        _event_id = i->second;
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                                else
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                                        break;
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                        }
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                }
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                // update last state
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                _last_state = state;
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                _last_millis = millis;
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        }
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        return _event_id;
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}
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int Button::get_triggered_event()
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{
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        return _event_id;
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}