implement the C program to the Simulink model

Hi,

I need to implement the below C program to the my Simulink model.

values :

A IS "D DYNAMICALLY ALLOCATED MATRIX"

A_row and R is some variables.

How can I Implement it in Simulink using c caller or with s function ? How can I input A values?I tried Using c caller and also with s function. But as I have a 2d matrix inside my struct, it is unable to implement so.

Can somebody help me?

Thanks in advance.

Regards,

Besme.

************************************My program starts here *********************************************************************

Header file as follows

struct ss_matrix // Initialize Structure for Inputs and outputs of StateSpace Equation

{

int A_row;

float **A;

float R;

};

Src file as follows;

struct ss_matrix ss_dyn_mem(struct ss_matrix dyn_mem_var)

{

dyn_mem_var.A =(float**) malloc(dyn_mem_var.A_row*sizeof(float*));

for (i = 0; i < dyn_mem_var.A_row; i++)

dyn_mem_var.A[i] =(float*) malloc(dyn_mem_var.A_row*sizeof(float));

}

struct ss_matrix ss_library(struct ss_matrix library_var)

{

library_var.A_row =library_var.R *library_var.A_row;

}

****++++++++++++++My program end here************************************************

Answer 1

[Rishav]

Hi Besme,

I understand that you are trying to implement a C program by using s-function in Simulink.

Here are the steps for the same:

1. Create a New Simulink model.

2. In your Simulink model, add an S-Function block. You can find this block under the "User-Defined Functions" section in the Simulink library browser.

3. Configure the S-Function Block:

• Double-click the S-Function block to open its properties.
• In the "S-Function Name" field, provide a unique name for your S-Function. This name will be used for the generated C code.
• In the "Parameters" tab, specify any input parameters you want to pass to the S-Function, such as A_row and R.

#include "simstruc.h"

struct ss_matrix {
    int A_row;
    float **A;
    float R;
};

void ss_dyn_mem(struct ss_matrix *dyn_mem_var) {
    dyn_mem_var->A = (float**)malloc(dyn_mem_var->A_row * sizeof(float*));
    for (int i = 0; i < dyn_mem_var->A_row; i++) {
        dyn_mem_var->A[i] = (float*)malloc(dyn_mem_var->A_row * sizeof(float));
    }
}

void ss_library(struct ss_matrix *library_var) {
    library_var->A_row = library_var->R * library_var->A_row;
}

5. After writing the C code, save the S-Function and compile it by clicking the "Build" button in the S-Function block dialog.

6. Connect the input and output signals to the S-Function block as needed for your model.

7. Now, you can simulate your Simulink model with the custom S-Function block. Make sure to provide appropriate input values for A_row and R in your Simulink model.

Thank you,

Rishav Saha