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Recursive Designfor Embedded Real-Time
Systems
Minoru YamaguchiMinoru YamaguchiSoftware Process Development Software Process Development sectionsection
MMSBCSBC ・・ CNCCNC
SSony Corporationony Corporation
Copyright 2001 Sony Corporation
Copyright 2001 Sony
Corporation
Contents
Project ObjectivesProject OverviewMetrics and ResultConclusion
Copyright 2001 Sony
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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
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