Problems with generating C code from simulink

Hi guys,

I'm trying to implement a subsystem in simulink and to convert it in a C code using the Embedded Coder. After generate the C code, I could realize the following: Let's assume a system that multiply the input by 3. The generated code of this function will be like that:

void block_step(void) { block_Y.Vout = 3.0 * block_U.V_in; }

this function doesn't receive/return any value (void type).

My idea was to generate this code and to test it with a S-function in order to check if the embedded coder is generating a correct C code, and to compare the results with a regular block in the simulink. I'm trying to do this because I have to implement a control system in a DSP. Anyone has a idea how can I reach this??? Thank you