MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guida Utente Scaricare il pdf (Pagina 109)

Examples of C MEX-File S-Function Blocks

3-65

Example - Hybrid System S-Functions

The S-function, matlabroot/simulink/src/mixedm.c,isanexampleofa

hybrid (a combination of continuous and discrete states) system.

mixedm.c

combines elements of csfunc.c and dsfunc.c. If you have a hybrid system,

place your continuous equationsin

mdlDerivative andyourdiscreteequations

mdlUpdate. In addition, you need to check for sample hits to determine at

what point your S-function is being called.

In Simulink block diagram form, the S-function,

mixedm.c looks like

which implements a continuous integrator followed by a discrete unit delay.

Since there are no tasks to completeat termination,

mdlTerminate is an empty

function.

mdlDerivatives calculatesthe derivativesofthe continuousstatesof

the state vector

x,andmdlUpdate contains the equations used to update the

discrete state vector,

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 209 210

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guida Utente Pagina 109