/elec/propeller-clock

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  • Committer: Tim Marston
  • Date: 2012-05-17 22:49:11 UTC
  • Revision ID: tim@ed.am-20120517224911-dbd9dtcpl14xlhi0
rewrote/fixed button event triggering code

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Lines of Context:
src/button.cc
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Button::Button( int pin )
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        :
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        _pin( pin ),
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        _state( false ),
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        _state_millis( 0 ),
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        _state_duration_done( 0 ),
 
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        _state_last( false ),
 
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        _millis_state( 0 ),
 
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        _millis_done( 0 ),
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        _pending_event( 0 ),
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        _send_interim( false ),
 
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        _interim_event( 0 ),
 
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        _send_interim( true ),
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        _ignore_next_unpress( false )
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{
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}
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        // to not sending interim presses, we need to ignore the next unpress, or
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        // this button press may trigger events while being presses *and* events
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        // when it is unpressed.
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        if( _state && _send_interim && !send_interim )
 
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        if( _state_last && _send_interim && !send_interim )
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                _ignore_next_unpress = true;
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        // set mode
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        // get time
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        unsigned long millis = ::millis();
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        // get state and check for change
 
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        // get button state
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        bool state = digitalRead( _pin )? false : true;
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        if( state != _state )
 
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        // if the button is pressed
 
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        if( state )
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        {
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                // if we're not sending interim presses, we care about when the button
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                // is being unpressed
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                if( !_send_interim && !state )
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                {
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                        // are we being told to ignore the next unpress?
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                        if( _ignore_next_unpress )
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                                _ignore_next_unpress = false;
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                        else
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                        {
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                                // check through events to see if the button was pressed long
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                                // enough to trigger one
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                                for( int a = 0; _event_times[ a ]; a++ )
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                                {
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                                        // if this event is in the future, we can stop looking
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                                        if( _state_millis < (unsigned long)_event_times[ a ] )
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                                                break;
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                                        // trigger it
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                                        _pending_event = a + 1;
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                                }
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                        }
 
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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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                if( !_state_last ) {
 
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                        _millis_state = millis;
 
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                        _millis_done = 0;
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                }
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                // reset state
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                _state = state;
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                _state_millis = millis;
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                _state_duration_done = 0;
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        }
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        // if we are sending interim presses, we care about all the time that the
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        // button is being pressed
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        if( _send_interim && state )
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        {
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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 pressed long
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                // enough to trigger one
 
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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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                {
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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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                                break;
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                        // if this event happened since the previous update, trigger it
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                        if( _state_duration_done < (unsigned long)_event_times[ 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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                        // trigger event
 
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                        if( _send_interim )
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                                _pending_event = a + 1;
 
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                        else
 
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                                _interim_event = a + 1;
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                }
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                // update the duration we've accounted for
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                _state_duration_done = duration;
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        }
 
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                // update the amount of press we have processed
 
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                _millis_done = elapsed;
 
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        }
 
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        // if the button has just become unpressed and we're not sending interim
 
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        // events, we'll need to trigger it now
 
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        if( !state && _state_last && !_send_interim )
 
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        {
 
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                // unless we're being told not to, trigger any interim events
 
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                if( _ignore_next_unpress )
 
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                        _ignore_next_unpress = false;
 
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                else
 
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                        _pending_event = _interim_event;
 
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                // clear any interim event
 
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                _interim_event = 0;
 
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        }
 
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        // update our state
 
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        _state_last = state;
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}
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