How can I create Arduino code from S-function MATLAB code ?

Hi,

I made the model of a closed-loop control system in Simulink. I used S-function (written in MATLAB code) for my model. Now I'm prototyping my control system on the Arduino. I know MATLAB/Simulink has a Hardware Support Package for Arduino. I have also read about Simulink IO and the External Mode of the support package. But I don't think either of them can help. Simulink IO just accesses the peripherals of the Arduino board and runs the model in PC. And as I understood, the External mode uploads the C code on hardware. But I need to see my code in Arduino IDE to add other futures to it later.

Please share your thoughts.

Many Thanks