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RI SEMINAR AND DEMO -- David B. Stewart


The current development of applications for sensor-based robotic and automation(R&A) systems is typically a `one-of-a-kind' process, where most software is developed from scratch, even though much of the code is similar to code writtenfor other applications. The cost of these systems can be drastically reduced and the capability of these systems improved by providing a suitable software framework for all R&A systems. We describe a novel software framework, based on the notion of dynamically reconfigurable software for sensor-based control systems. Tools to support the implementation of this framework have been built into the Chimera 3.0 Real-Time Operating System. The framework provides for thesystematic development and predictable execution of flexible R&A applications while maintaining the ability to reuse code from previous applications. It combines object-oriented design of software with port-automaton design of digital control systems. A control module is a instance of a class of port-based objects. A task set is formed by integrating objects from a module library to form a specific configuration. An implementation using global state variables for the automatic integration of port-based objects is presented. A control subsystem is a collection of jobs which are executed one at a time, and can be programmed by a user. Multiple control subsystems can execute in parallel, and operate either independently or cooperatively. One of the fundamental concepts of reconfigurable software design is that modules are developed independent of the target hardware. Our framework defines classes of reconfigurable device driver objects for proving hardware independence to I/O devices, sensors, actuators, and special purpose processors. Hardware independent real-time communication mechanisms for inter-subsystem communication are also described. Along with providing a foundation for design of dynamically reconfigurable real-time software, we are also developing many modules for the control module, device driver, and subroutine libraries. As thelibraries continue to grow, they will form the basis of code that can eventually be used by future R&A applications. There will no longer be a need for developing software from scratch for new applications, since many required modules will already be available in one of the libraries.

Host: Norman Sadeh (x8-8827, sadeh@ri.cmu.edu)

Christopher Lee | chrislee@ri.cmu.edu
Last modified: Thu Oct 13 17:53:17 1994