Integration of C APIs to Simulink Models

Dear All,

I am using Model Based Design Consept for Embedded Systems in Simulink.

I have two layers of my software:

- Upper Level : Generated Code from Simulink model (Application Level)

- Low Level : C Api (Basic Level)

My application level software(Simulink model) needs to use C api that is given from another company.

I believe I should define C Api functions in my Simulink model to be able to generate code succesfully.

I do not know how to utilize C Api and Simulink Model that uses that API and usign Code Generation for overall all the system

Any help will be appreciated.