MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur télécharger pdf (Page 169)

Introduction

4-3

environment with a great deal of flexibility. This flexibility cannot always be

maintained when you use S-functions with the Real-Time Workshop. For

example,itis notpossibletoaccess theMATLABworkspacefromanS-function

that is used with the Real-Time Workshop. However, using the techniques

presentedin this chapter,you can createS-functions for mostapplications that

work with the generated code from the Real-Time Workshop.

Although S-functions provide a generic and flexible solution for implementing

complex algorithms in Simulink, they require significant m emory and

computation resources. Most often the additional resources are acceptable for

real-time ra pid prototyping systems. In many cases, though, additional

resources are unavailable in real-time embedded applications. You can

minimize memory and computational requirements by using the Target

Language Compiler technology provided with the Real-Time Workshop to

inline your S-functions.

Types of S-Functions

The implementation of S-functions changes based on your requirements. This

chapter discusses the typical problems that you may face and how to create

S-functions for applications that need to work with Simulink and the

Real-Time Workshop. These are some (informally defined) common situations:

1 “I’m not concerned with efficiency. I just want to write one version of my

algorithm and have it work in Simulink and the Real-Time Workshop

automatically.”

2 “I have a lot of hand-written code that I need to interface. I want to call my

functionfrom Simulinkand the Real-TimeWorkshopin an efficientmanner.

or said another way:

“I want to create a block for my blockset that will be distributed throughout

my organization. I’d like it to be very maintainable with efficient code. I’d

like my algorithm to exist in one place but work with both Simulink and the

Real-Time Workshop.”

3 “I want to implement a highly optimized algorithm in Simulink and the

Real-Time Workshop that looks like a built-in block and generates very

efficient code.”

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