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<H1><A NAME="SECTION00310000000000000000">
Introduction</A>
</H1>
<P>
The user must supply a file by the name of <TT>user_GUI.par</TT> that
resides in the <TT>user</TT> directory under the RTiC-Lab source
tree. This pure ASCII file has several roles:
<P>
<OL>
<LI>allows the user to create custom-made
graphical user interfaces through which the user can update parameters
in real time for the user's controller, defined in the file <TT>user_controller.c</TT>. The actual window that is affected by this
script file can be found under the ``Options'' window, on the
``Controller'' tab, and ``Open''.
</LI>
<LI>allows the user to override <TT>xrtic</TT> defaults
</LI>
<LI>tells <TT>rtic</TT> how many inputs, how many outputs, and how many data points will be handled for the given control application
</LI>
</OL>
<P>
Each of these tokens associated with a user's parameter is identified
via a <I>unique</I> identifier constant. Examples of this are shown
in the Examples section, Section
<A HREF="node36.html#PAR_Examples">3.3</A>.
<P>
For example, in this file, the user may specify that a ``slider''
token (a widget which looks like a linear resistor) will be linked to
the parameter with ID of ``3'', which is to be used in the real time
tasks. So, if the user moves the slider bar to a value of ``15.2'',
the real time parameter with the unique ID of ``3'' will receive the
value of ``15.2''. Parameters in the user's controller may then be
updated by the use the macro
``GET_SCALAR_PARAMETER(ID)''. So, from the previous slider
example, we can update the value of a derivative gain in the embedded
controller code by the following piece of code:
<P><PRE>
/* get the value of the derivative gain */
Td = GET_SCALAR_PARAMETER(3);
</PRE>
<P>
The next section describes the available tokens.
<P>
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<ADDRESS>
Michael Barabanov
2001-06-19
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