AKC SE Plan

MEI PROPRIETARY

Automated Generation Of Code From Simulink To An Event-Based Simulation Framework

Jonathan Maram

Isela Villanueva

Millennium Engineering And Integration

16 March 2010

SSCGI2

MEI PROPRIETARY

Simulation Environments Used By MEI

• Simulink

–Dynamic System Modeling/Simulations

–Graphical Block-Diagramming Tool

–Tightly Integrated With Matlab Command Library

–Means To Generate Time-Driven Code

• Event-based Framework (EBF)

–Discrete Event Messaging

–Models created with compiled code

–Componentized Simulation Layers

• Middleware, Controller Layers

• User Components; Simulation Engine & Model Layers

Benefit Derived From Porting Simulink-Developed Models

Into EBF Simulations

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Required Information Flow From Simulink To EBF During Code Generation

Model1Out1 In2

Model1 Constructor

Simulink

EBF

Code

Elements

Model1 Initializer

Model1 Event1 Constructor

Model1 Self-Schedule Event Handler

Model Logic

Model Traits

Model2

Model Logic

Model Traits

Model2 Initializer

Model1 Event1 Handler

Model2 Constructor

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Time-consuming Manual Approach Initially Used

• User

• XML

• Graphic

• File

• Database

Controller

Simulation Engine

OutputInput

Functional Model (Code Generated from Simulink or other sources)

Implements Methods in the Model API

Model Base Class

Interface CodeProcess Events, Call Functional ModelPublish and Subscribe to Attributes, Output StreamsImplements Methods in the Inline Functionality API

Inline Functionality APIModel API

•Functional model code generated from Simulink

•Other components hand-written

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Tasks For Automation

• Extract Information About Targeted Models And Their I/O

• Store Information In A .MAT file

• Generate Functional Model Code From Simulink Using Standard Templates

• Generate Additional Interface Code Using Custom Code Templates– Model classes, including Event Handling Methods

– Attribute classes

– Event classes

• Generate Makefile Or Visual Studio Projects/Solution

• Compile & Build EBF code

• Generate Prototype Run-Time Configuration Files– Incorporate Simulink Tunable Parameters

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Automated EBF Code Generation Implemented

Reusable Code Templates Matlab Scripts

Develop ETE

Simulink Model Generate Code

Generate Custom Code Templates VS Solution

VS Projects

C++ files

Build EBF Simulation

Model DLLs

Simitar Executable

Run EBF Simulations

Baseline Config Files

Automated Code Generation

Model Development

Run Simulink

Simulations

Compare Results

Configure For CG

Extracted Model Data

Tunable Parameters

(Customizations)

EBF API

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Testing Performed To Verify Fidelity Of Generated Code

• 4 Synthetic Test Cases

– varied I/O schemes

– varied feedback schemes

– multiple rates

• 4 Simulink Models Developed In-House or By MEI Partners

– Representation of Sensors, Association, State Estimation, Control, Actuators, and Flight Dynamics

• Output data from Simulink & EBF Simulations Compared

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Example Scenario Targeted For Code Generation

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Example Parameter Compared: Pointing Error

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Pointing Error Time Plots Compared

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Pointing Errors Compare Well

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Summary

•Customized scripts and templates used to generate EBF scenario

– Inputs/Outputs Characterized and Adapted

–Model Traits Captured And Incorporated

•Templates Structured With EBF-Specific Code

–Model, Event, Attribute Classes

–Model Initialization and Event Handling Methods

– Communication, Event Scheduling, Data Handling

•Code Generation Interface Tested and Validated With Several Scenarios