Design of dynamically reconfigurable real-time software using port-based objects

Abstract

The current development of applications for sensor-based robotic and automation (R&A) systems is typically a "one-of-a-kind" pmcess, where most software is developed from scratch, even though much of the code is similar to code written for 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 system. We describe a novel software framework, based on the notion of dynamically reconfigurable software for sensor-based control systems. Tools to suppon the implementation of this framework have been built into the Chimera 3.0 Real-Time Operating System. The framework provides for the systematic 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 an 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 YO 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 the libraries 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.

An Approach to Distributed Component-Based Software for Robotics

“…All in all, the model of computation of CoolBOT systems follows the Flow Based Programming (FBP) paradigm according to [J. Paul Morrison (2010)], so systems can be built as networks of components interconnected by means of port connections. More formally, CoolBOT components are modeled as port automata [Steenstrup et al (1983)] [Stewart et al (1997)]. Fig.…”

Optimizing Resource Usage in Component-Based Real-Time Systems

“…By combining the notion of transactions and the pipe-and-filter interaction model we get a general component model that is easy to implement for a large set of component technologies for embedded systems such as Autocomp [14], SaveCCM [15], Rubus [16], Koala [17], Port-based objects [18], IEC61131 [19] and Simulink [20]. The component model characteristics are described in the section 2.1 and the task model characteristics are described in section 2.2.…”

Evaluation of component technologies with respect to industrial requirements

“…Port Based Objects (PBO) [18] combines object oriented design, with port automaton theory. PBO was developed as a part of the Chimera Operating System (Chimera OS) project [6], at the Advanced Manipulators Laboratory at Carnegie Mellon University.…”