Arduino Setup() function using simulink

Hi, is there a way to create in a Simulink model for Arduino Due (embedded coder) the equivalent of the Setup() function, I mean a function that prepares everything and runs just once before the loop starts? I'm trying to read through i2c some sensors that need to be initialized and I can't find a way to create this kind of sequential workflow. Thank you

[Madhu Govindarajan]

the latest version of Simulink support package for Arduino has an I2C block. For your purpose have you looked into the possibility of using S-function blocks?

[Gianluca]

Hi, thank you for the attention. I know about the I2C block of the Simulink support package. I have a basic understanding of S-Function and I don't see how they can be used to write code that must be executed just once, before the simulation loop begins. Could you please point me to an example?