23 lines
1.1 KiB
TeX
23 lines
1.1 KiB
TeX
\subsection{FOCUS Data File Writing}
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FOCUS writes NeXus files. This file writing is impleneted in the files
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fowrite.h and fowrite.c. So these files contain the code for writing
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FOCUS NeXus files. But there is more to it: FOCUS has a scheme where
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the data file is updated any 20 minutes during the course of an
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measurement. This scheme is implemented with the following bits and
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pieces:
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\begin{itemize}
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\item Data file updating is triggered by a special task function,
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FoTask, which is installed into the SICS tasker when counting starts.
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\item The module registers callbacks with the histogram memory which
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are invoked when counting starts or ends. These callback functions
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take care of craeting a new file and updating it.
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\item There is a special command which allows to start and update the
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data file manually.
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\end{itemize}
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As is it not likely that more then one FOCUS writing object is ever
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needed, all the data structures are file statics in fowrite.c. The
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external interface of this module is just a interpreter initialisation
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function and a interpreter interface function for interacting with the
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data file writing object.
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