Matlab S-Function: How to fix mdlStart() not being called

Problem

You have an S-Function in Matlab/Simulink and the mdlStart function is not being called:

sfunc_mdlstart_example.cpp

static void mdlStart(SimStruct *S)
{
    // This code is never executed
}

static void mdlStart(SimStruct *S)
{
    // This code is never executed
}

You need to #define MDL_START in your S-Function file before your mdlStart() function:

example.cpp

#define MDL_START
static void mdlStart(SimStruct *S)
{
    // This code is now executed
}

#define MDL_START
static void mdlStart(SimStruct *S)
{
    // This code is now executed
}

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