How can I create a function from a model reference block that returns a value in Simulink coder?

I am using MATLAB 2013a with Simulink Coder ver 8.4 and am having some difficulty customizing the auto-generated code from my simulink model.

I have a top level model that performs some basic calculations and calls some model reference blocks for specific functions. Because my project will be used on a 32-bit embedded system, I have been using the ert.tlc target file as well as the "Generate reusable code" setting as modularity is a goal. I have noticed that for any model reference block Simulink Coder will produce C code such that the output of the model reference is stored in a pointer rather than the function returning a value and storing the value in, say, a local variable:

void myMdlRef(real32_T input, real32_T *output)
  {
     ...
  }

Where the function call in the top-level model appears as:

myMdlRef(input, &rtb_output);

I am wondering if there is a way to make the function return the value rather than storing the information in the pointer:

real32_T myMdlRef(real32_T input)
  {
     ...
     return output;
  }

such that I can generate the top-level code as:

output = myMdlRef(input);

I have also seen the same code generation when performed on an atomic subsystem with the "Reusable code" function packaging set.

Any help would be greatly appreciated!

Answer 1

[Kaustubha Govind]

You should be able to use Function Prototype Control to specify that your output be generated as a value and not a pointer.

[Bryan]

Got it to work perfectly. Thank you very much!