Computer Science – Performance
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3350..146i&link_type=abstract
Proc. SPIE Vol. 3350, p. 146-152, Astronomical Interferometry, Robert D. Reasenberg; Ed.
Computer Science
Performance
Scientific paper
Since modern astronomical interferometers require a large number of sensors and actuators for closed-loop control of opto-mechanical components, reconfigurability of the hardware is a strongly desired feature of interferometer control software. In order for software control systems to access hardware with a standard interface and be easily reconfigurable, a layer of software is needed to communicate with the hardware driver software that is modular. If the details of the hardware configuration can be abstracted from the controller software, moving a device to a different I/O board or channel becomes a much easier task. Device mobility is important when testing the performance of computer and instrument hardware, and controller software; it also makes the software much easier to reuse in different instruments. Object-oriented programming provides a model that permits the abstraction of this hardware driver layer. The JPL Realtime Interferometer Control System Testbed (RICST) has developed hardware driver software that employs an object- oriented paradigm and allows relatively simple reconfigurability of devices and I/O boards. This scheme is especially useful since RICST is developing software for use by multiple projects. The top level of the class hierarchy includes Boards, Channels, Channel Banks, Clocks, and Interrupts; these abstract objects provide a common interface for control software to communicate with the hardware.
Goullioud Renaud
Irwin Philip C.
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