MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guida Utente Scaricare il pdf (Pagina 183)

Writing Wrapper S-Functions

4-17

The final step is the actual inlining of the call to the function my_alg.Thisis

done by the

Outputs function. In this function, you load the input and output

and call place a direct call to

my_alg. The call is embedded in wrapper.c.

The Inlined Code

The code generated wh en you inline your wrapp er S-function is similar to the

defaultgenerated code. The

MdlTerminate functi on no longer contains a call to

an empty function and the

MdlOutputs function now directly calls my_alg:

void MdlOutputs(int_T tid)

{

/* Sin Block: <Root>/Sin */

rtB.Sin = rtP.Sin.Amplitude *

sin(rtP.Sin.Frequency * ssGetT(rtS) + rtP.Sin.Phase);

/* S-Function Block: <Root>/S-Function */

rtB.S_Function = my_alg(rtB.Sin);

/* Outport Block: <Root>/Out */

rtY.Out = rtB.S_Function;

}

Inaddition,wrapper.reg nolongercreatesachildSimStruct for theS-function

since the generated code i s calling

my_alg directly. T his eliminates over 1K of

memory usage.

Inlined call to the

function my_alg.

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guida Utente Pagina 183