Software Modeling Techniques for Embedded Systems

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Software Modeling Techniquesfor Embedded Systems
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Overview

• Aspects of Software Engineering
• State of the Art in SE for ES
• Selected Topics
• ARTiSAN
• ROOM
• ObjecTime
• Octopus
• Summary

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Software Engineering for Embedded Systems

• Process
• Number of Steps Guiding Path
• Formalism Notation Diagram
• Class, State, Sequence, Timing, Concurrency,
  System Architecture, Port Notation
• Tool Support
• Editors, Repositories, Simulators,
  Synchronization, Round-Trip / Reverse
  Engineering, Version Control

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State of the Art

• UML for Real-Time
• Within RTAD (part of OMG), companies are working
  on UML-RT, but standard is NOT FINISHED
• Concrete tools by different vendors use
  home-brewed recipes
• I-Logix - Rhapsody
• ARTiSAN - Realtime Studio
• ObjecTime / Rational - ObjecTime Developer ? Rose
  Realtime
• Other Methodologies
• SE methods developed in pre-UML era
• Recently OO-ified and UML-ified
• Room ? integrated in Rose Realtime
• Octopus ? Octopus/UML

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ARTiSANs UML for Real-Time

• Focus Extending UML-notations to accommodate
  needs of embedded systems design
• Process
• Modeling requirements (Use Cases, Interaction
  Diagrams)
• Modeling architecture (Class, State, Concurrency,
  ...)
• Extras
• System level concurrent task design
• Support for HW/SW co-design
• Discussion
• RT constraints described with non-formal
  comments, with limited tool support
• Limited resource constraints

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Sequence Diagram
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Concurrency Diagram
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System Architecture Diagram
Solution Architecture Mapping
Deployment Diagram
System Architecture Diagram
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ROOM

• Developed for telecommunication systems, defines
  process notations
• Process
• Standard software process, with focus on
  iterative development
• Extras
• Port Notation
• Formal approach with controlled gaps allows for
  round-trip engineering
• Simulators all models can be executed
• Discussion
• Continuity of concepts across development process
• Support for expressing real-time constraints ?
• No resource constraints

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ObjecTimes UML for Real-TIME

• Combination of UML, role modeling and ROOM
  concepts
• Discussion
• Freestyle mapping of ROOM diagrams on UML
• Round-trip engineering becomes difficult
• see ROOM

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Port Notation
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State Chart
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Octopus

• Focus on development method, not on notation
• Method
• Requirements Specification
• System Architecture Analysis
• System Increment Subsystems Development
• Performance Analysis
• Extras
• Hardware abstraction
• Discussion
• No resource constraints
• Realistic use of timing diagrams
• Very orchestrated process

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Timing Diagram
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Overview