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HRT Hood

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Addresses the concerns of hard real time. Where is it used. Military. ESA. ADA programming ... and must be transformed into one of the above types before ... – PowerPoint PPT presentation

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Title: HRT Hood


1
HRT Hood
  • By (Names removed)

2
What is HRT Hood
  • Hard Real Time Hierarchical Object Orientated
    Design
  • ADA orientated design method first contracted
    development of HOOD was by the ESA in 1986/7
  • Used for Prioritizing over system processes in
    most real time software design stages.

3
What is HRT Hood (Cont)
  • Sponsored by ESA and UK Defence Research Agency
  • Addresses the concerns of hard real time.

4
Where is it used
  • Military
  • ESA
  • ADA programming
  • Columbus software Development Environment/SDE

5
HRT Hood Activities for architectural design
  • The logical architecture design activities
  • Used to satisfy the functional requirements
  • The physical architecture design activity
  • Takes these requirements, other constraints into
    account, and non-functional requirements

6
What is a hard real time system
  • A system which has components which must produce
    timely services, failure to produce a service
    within the required time interval may result in
    severe damage to the system or the environment,
    and may potentially cause loss of life.
  • Definition by Burns and Wellings HRT HOOD 1995

7
  • Allows timing attributes to be associated with
    objects.
  • Provides a framework from within which a
    schedulability approach can be defined and the
    analysis of the terminal objects undertaken.
  • Provides the abstractations with which the
    designer can express the handling of timing
    errors.

8
  • HRT HOOD facilitates the logical architectural
    design of a system by providing different object
    typed - Passive, Active, Protected, Cyclic and
    Sporadic. Which active objects are moved to
    background activities and must be transformed
    into one of the above types before reaching the
    terminal level

9
Diagrammatic representation of HRT-HOOD
  • Shows the hierarchical decomposition of a parent
    object into 2 child objects

10
HRT Hood Example
  • Mine drainage System
  • Written in Ada which shows the typical
    characteristics of embedded real time systems

11
The End
  • Thank you for listening
  • Any Questions
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