Level 2 C++ S-function not showing multiple input output ports

Hello, I have a C++ Level 2 Sfunction that is compiling via Mex but when i bring it into simulink, it shows only one input port, and one output port. Not sure what i need to do here. Am i missing something?

#ifdef __cplusplus
extern "C" { // use the C fcn-call standard for all functions  
#endif       // defined within this scope    
#define S_FUNCTION_LEVEL 2

...
#define NParam       207 // Total number of paramters
#define NInputs     205 // Number of input ports
#define NOutputs    52 // Total Number of output ports
... (some omitted #defines)
#include "simstruc.h"
... (some omitted #includes)
static void mdlInitializeSizes(SimStruct *S)
{
     /* Number of expected parameters */
    ssSetNumSFcnParams(S, NParam);
    if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S)) {
        /* Return if number of expected != number of actual parameters */
        return;
    }

      /* Setup for input ports */
      if (!ssSetNumInputPorts(S, NInputs)) return;
      for (int i=0; i<NInputs; i++){ /* loop stuff ommited /*}

      /* Setup for output ports */
      if (!ssSetNumOutputPorts(S, NOutputs)) return;
      for (int j=0; j<NOutputs; j++){ /* loop stuff ommited /*}

      /* No continuous and discrete states */
      ssSetNumContStates(S, 0);
      ssSetNumDiscStates(S, 0);

      ssSetNumSampleTimes(S, NSampleTimes);
      ssSetNumRWork(S, NUMRWORK);
      ssSetNumIWork(S, NUMIWORK);
      ssSetNumPWork(S, NUMPWORK);
      ssSetNumModes(S, NUMMODES);
      ssSetNumNonsampledZCs(S, 0);
      ssSetOptions(S, 0);

}
... (some other functions)

[adam honse]

An update, i deleted the simulink block and re-added the s-func, and now everytime i click ok or apply, after specifying the s-func, matlab totally crashes (*poof*).

Answer 1

[Mark McBroom]

code looks OK. In your Simulink S-Function block, did you create a mask with 207 parameters and pass all 207 parameters in the "S-function parameters:" field?

[adam honse]

It finally updated after i added a missing file for a dll i was including in the s-func. It looks like it was killing the whole thing when it couldn't load the dll.

Answer 2

[mohammed Hanneef]

I had similar problem but then realized one of the reason for this is the Sfunction file name provided in the S-function Name shall be written without an extension such as "mysfunction.c shall be written as mysfunction". when i did this it worked for me.

check it out