MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur télécharger pdf (Page 181)

Writing Wrapper S-Functions

4-15

to your C algorithm (my_alg), you can elim inate bo th the SimStruct and the

extra function call, thereby improving the efficiency and reducing the size of

the generated code.

Inlining a wrapper S-function requires an

sfunction.tlc file for the

S-function; this file must contain the function call to

my_alg.Thispicture

shows the relationships between the algorithm, the wrapper S-function, and

the

sfunction.tlc file:

Figure 4-2: Inlining an Algorithm by Using a TLC File

To inline this ca ll, y o u hav e t o place your function cal l into an sfunction.tlc

file with the sam e na me as t he S-function (in this example, wrapsfcn.tlc).

This cause s the Target L ang u ag e Compiler t o override the default met hod of

my_alg.c

myalg()

{

}

wrapper.c

...

MdlOutputs

{

...

y = my_alg();

...

}

...

wrapsfcn.tlc

...

%<y> = my_alg(%<u>);

...

The wrapsfcn.tlc file tells the

Real-Time Workshop how to inline the

call to

my_alg using this statement:

1 2 ... 176 177 178 179 180 181 182 183 184 185 186 ... 209 210

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur Page 181