TRACKPixx Demo 1 -- Recording and plotting fixation data with the TRACKPixx3
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.. Note::
    This demo requires TRACKPixx Revision 18 or later. You can check for recent firmware updates at vpixx.com/whatsnew

This simple eye-tracking demo displays a central dot on the screen and records 5 seconds of fixation data. This data is then displayed and saved in a .csv file for further analysis in your software of choice. 

.. image:: Fixation.*
  :width: 300
  :align: center

At the beginning of the demo there is an optional calibration step. This step calls ``TPxTrackpixx3CalibrationTesting``, which implements a standard MATLAB TRACKPixx3 calibration script. The tracker must be calibrated for every new participant. We also recommend calibrating if a participant moves away from the chinrest.

Following calibration the demo wakes the TRACKPixx3, sets up a tracking schedule with ``SetupTPxSchedule``, and starts this schedule with ``StartTpxSchedule`` shortly after target onset. This schedule controls the recording of eye data, which is stored in a data buffer on the DATAPixx3 controller. We record 5 seconds of fixation data, and then plot this in MATLAB for inspection. Eye data is also written into a .csv file for further analysis. 

.. literalinclude:: ../DatapixxToolbox/DatapixxDemos/TPxFixation.m
   :language: matlab
   :emphasize-lines: 27-30, 34-35, 65, 72, 79-81, 124
   :linenos: