Matlab S-function segmentation violation

Hi everybody! I am running a simulation and matlab gives me this error after 30 minutes:

For me it is very rare because I am not using any input at the S-function. I only use outputs so I dont understand what is happening. I am attaching the function where i initialized everything.

    static void mdlInitializeSizes(SimStruct *S)
    {
       // hay 1 parametro que se introduce por simulink
        ssSetNumSFcnParams(S, 1);
        // si no estan los parametros esperados salta el error
        if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S)) 
        {
            return;
        }
        //Se asignan las entradas de matlab a las variables
        periodo             = 1*(double) mxGetPr (ssGetSFcnParam(S,0))[0];   /* parameter[1]: Sampling period */

        /* OUTPUTS */
         //especifica las SALIDAS
        if (!ssSetNumOutputPorts(S, max_vars)) return;

        //Se especifica el ancho y tipo de las variables que en este caso todas son de 1 para simplificar
            for (i=0;i<max_vars;i++)
        {
            ssSetOutputPortWidth(S, i, 1);
            ssSetOutputPortDataType( S, i, SS_BOOLEAN );
        }

        ssSetNumSampleTimes(S, 1);
        ssSetOptions(S, 0);

       //VARDB 
        //se conecta a la vardb
       bool opened = do1_vardb.ConnectVarDB("DO1");
       //se comprueba que se ha conectado a la vardb que se quiera
       const char *name = do1_vardb.GetVarDBName();

        //se conectan todas las variables
       for(i = 1; i < 10; ++i){
          sprintf(buffer, "%s%d","DO_VALUE_CHN_0", i);
          CVarDBAccess *varaccess = do1_vardb.ConnectVar(buffer, Boolean1, 1);
          accesses.push_back(varaccess);
       }
        for(i = 10; i <= max_vars; ++i){
          sprintf(buffer, "%s%d","DO_VALUE_CHN_", i);
          CVarDBAccess *varaccess = do1_vardb.ConnectVar(buffer, Boolean1, 1);
          accesses.push_back(varaccess);
       } 

    }

Answer 1

[Anusha B]

Hi Ander,

You can debug your S-function either in Simulink or using a third-party software. The following link can help you in this regard:

http://www.mathworks.com/help/simulink/debug-s-functions.html

Answer 2

[ander]

I know that. But the problem is that the simulation runs more or less 30 minutes and suddenly goes to crash. I don´t know how to solve the problem because is not something that happens at the beginning of the simulation. The crash happens after 30 minutes.