Modeling%20Event-Based%20Systems%20in%20Ptolemy%20II%20EE249%20Project%20Status%20Report

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Modeling Event-Based Systems in Ptolemy IIEE249
Project Status Report

• Elaine Cheong
• Yang Zhao
• November 20, 2001

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Introduction

• Networked sensors
• Small physical size
• Low power consumption
• Concurrency-intensive operation
• Diversity in Design and Usage
• Application specific, not general purpose
• Efficient modularity
• Robust Operation
• Numerous, unattended, critical
• Narrow interfaces
• TinyOS

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TinyOS Architecture

• TinyOS contains a two-level scheduler and a graph
  of components
• Component
• Frame
• Event handlers
• Command handlers
• Tasks
• Constrained storage model
• Frame per component, shared stack, no heap
• Relationship
• Event commands, tasks, events
• Command commands, tasks
• Task commands, tasks

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Our Goal

• Study the architecture of TinyOS
• Model it in Ptolemy II
• Explore new models of computation
• The Big Picture
• Code Generation

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How we model it in Ptolemy

• RTOS domain with FSM

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Next Step

• SR domain
• Logically, there is an instantaneous dialog
  between Event handlers and Command handlers.

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Questions?