Automatic generation of S function for a c code

I have a C code and want generate S function for it using matlab scripting..(Avoid manual steps required for s function generation)..Can any one help me for this

Answer 1

[Kaustubha Govind]

You can use the Legacy Code Tool to generate a C-MEX S-function wrapper for your C-code.

[Rupesh]

Thanks Kaustubha for the answer...It seems to be working for me...Additionaly I have one more question: My C function does not have any input argument nor it returns anything(it is of kind void main(void))...But I need to provide some input values for the internal signals of c code and simillarly I need to take few internal variables as output variables from the s function that will be created from my c code....Could you please let me know how it can be done...

[Kaustubha Govind]

Rupesh: Not sure what you mean by "internal variables". How would you provide/access the values if you were writing the code outside of Simulink?

[Rupesh]

suppose my code is like

main() { int a,b,c; c=a+b; }

As main function does not take any input argument nor it returns anything.. In my problem I have to pass values of variable a and b from matlab environment and then take out variable c in matlab environment

[Walter Roberson]

How are the values stored in the MATLAB environment? Is there a reason you are not using a From Workspace block feeding parameters to the S function ? If changing the C code is not allowed, then how does the C code get its values at the moment?

[Rupesh]

I have to connect these variables(here a and b) using inports in Simulink. and will provide values through test vectors in .m file.. On the same lines output c should be connected to outport of Simulink..

Looking after for your answer

[Kaustubha Govind]

Rupesh: Walter's question was about how you might invoke the C code from another C application and supply inputs. It seems to me that you have to rewrite your C code so that the inputs a and b are passed in as function argument and c as a return argument. Once you have done that, you can use the Legacy Code Tool to generate an S-function so that the block inputs are passed in to 'a' and 'b' and 'c' is assigned back to the block output.