Digital I/O Demo 1 -- Recording digital input from a RESPONSEPixx
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This demo prints how many digital IOs you have access to. Since it interacts with a RESPONSEPixx, it changes five IOs to outputs.
Lines 30-32 show how this is done. The value ``0x1F0000`` means that digital IOs 3 to 7 are digital outs. This comes from the binary representation
of ``0x1F0000``, which is ``0b0001 1111 0000 0000 0000 0000`` (which represents IOs 0 to 23). 

This demo also uses **markers**. Markers are used for measuring the time seperating two specific events. As a first step, you must do your first marker, ``Datapixx('SetMarker');``,
then you must decide when that marker should occur. In this example, let us use the video sync: ``Datapixx('RegWrRdVideoSync');``. You cannot get a value of the device time on that marker:
``stimulusOnsetTime = Datapixx('GetMarker');``.

After this, we set up our button box: ``Datapixx('EnableDinDebounce');``, this allows us to ignore the values that oscillate when a button is pushed. ``Datapixx('SetDinLog');`` tells
the device that we are going to log all the RESPONSEPixx presses. Like a schedule, you must then start the logging operation ``Datapixx('StartDinLog');``.

Once the experiement is started,  you can get the reactions/buttons presses and their timestamps using ``[data tt] = Datapixx('ReadDinLog');``. You can also get a response 
time with the difference between the timestamps and the marker.
 
    
.. literalinclude:: ../DatapixxToolbox/DatapixxDemos/DatapixxDinBasicDemo.m
   :language: matlab
   :emphasize-lines: 23, 31-33, 37-39, 42-45, 71, 73
   :linenos: