Recursive Designfor Embedded Real-Time

Systems

Minoru YamaguchiMinoru YamaguchiSoftware Process Development Software Process Development sectionsection

MMSBCSBC ・・ CNCCNC

SSony Corporationony Corporation

Copyright 2001 Sony Corporation

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Corporation

Contents

Project ObjectivesProject OverviewMetrics and ResultConclusion

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Project Objectives

Subject Evaluate some points to know the risks

that making real-time embedded systems on OOA technology

Evaluate Points Program size and Performance Development Process

Evaluate on Real Embedded System

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UML Model

Target Code

Hand Coding

Translation

Development byHand Coding and

Translation

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analysisanalysis

designdesign

codingcoding

Analysis models

Design models

Programcodes

application

architectures

target

Evolutional flow for Software Development

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Analysis models

Translation rules

Programcodes

Translation flow for Software Developmentapplication

analysisanalysis

designdesign

TranslateTranslate

architectures

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Small part was build by OOA for to just evaluate. (It’s about 5% of all requirements) Reaction time (Performance)

Data processing ： within 2ms Program size

ROM:100KByte RAM:10KByte（ *） These are program size of OOA model part. Not include

Bridge, Hand cording libraries, and another software.

Detail of evaluate points

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Target platform

CPU : SH1 (26MIPS)ROM : 1 MBRAM: 128 KBOS : μITRON Ver2.02

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CASE tool and Method

Rational Rose98 UML Generate skeleton C++ codes

Project Technology BridgePoint 4.0 Shlaer/Mellor Method UML Generate full C++/C codes ( DesignPoint MC-2010/MC-3020 )

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Translation architecture

DesignPoint MC-2010 Programming language ： C++ Event coding style ： message queue

(asynchronous) Paths of compile ： 1 time

DesignPoint MC-3020 Programming language ： C Event coding style ： function call (synchronous)

& message queue (asynchronous) Paths of compile ： 2 times

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Evolutional coding rule

Rose98 Generate skeleton C++ codes

（ function to access the attribute, Default constructor ）

Hand cording body of function Programming language ： C++ Event coding style ： function call State chart ：

Need state control ： 2 dimension state table No need state control ： execute the action in it’s

event function

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Rose Evolutional flow Code generation (C++)

only for fundamental functions & constructors

BridgePoint & DesignPoint Translation flow Full code generation

(C, C++)

Object models

Generate skeleton Translation architectureMC-3020(C)MC-2010(C++)

Add hand code

Source Code 1 (C++)

Source Code 2 (C)

Source Code 3 (C++)

Process

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Domains ： 3Classes ： 56 Passive ： 23 Active ： 33

Relationships ： 50 Binary ： 45 Super type & sub type ： 5

Persistent instances ： 107

Model spec

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Data processing time

0.739

1.354

19.3

0 5 10 15 20 25

Rose

BridgePoint

(MC3020)

BridgePoint

(MC2010)

C++

CC+

+

(ms)

Target 2ms

Result of performance

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Program size

43.8

39.2

149

5.3

7.1

45

0 20 40 60 80 100 120 140 160

Rose

BridgePoint

(MC3020)

BridgePoint

(MC2010)

C++

CC++

(KB) RAM (KB) CoreROM (KB) Core

Target (ROM) 100KBTarget (RAM) 10KB

Result of program size

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Amount of resources

SR

S Writing SRS

Designing byRose98

Designing byBridgePoint

Making libraries

Testing

Modeling byRose98

Modeling byBridgePoint

an

aly

sis

desig

nte

st

12/13 12/31 1/31 3/312/29

Make the executable model, and simulate on Win NT

Customize MC-2010 architecture(framework 、 RTOS 、 debug environment) Customize MC-3020

Coding & debugging C++ hand coding source

Meeting for Software Requirements

Drawing analysis model to understand the SRS

Making the Bridges & instances

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Total effort of staff-days

0 20 40 60

MC-3020

MC-2010

Rose

staff -days

Analysis

Design&Coding

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Production hour result

0 10 20 30 40 50 60

MC-3020

MC-2010

Rose

days

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Result of evaluation

Code generation technique is of practical use for real-time embedded systems.Rose & BridgePoint are needed to get best process.

Performance Program size Productivity Documentation

Hand coding ○ ○ △ ×Rose

(Hand coding) ○ ○ × ○BridgePointMC-2010（ ） × × ○ △

BridgePointMC-3020（ ） ○ ○ ○ △

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however, there are some problem to be solved.

Need the knowledge & experience of OOA. Should provide the process or technique

for to keep the Hard-real-time. There are no CASE tools better than MS-

Word.

OOA is useful to providing OOA is useful to providing real-time embedded systemsreal-time embedded systemsOOA is useful to providing OOA is useful to providing

real-time embedded systemsreal-time embedded systems

Conclusion