Convert a MEX-function to an S-function

Question

Martijn 2012-5-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/39764-convert-a-mex-function-to-an-s-function

评论： Erivelton Gualter 2018-2-23

Dear all,

I want to implement an opensource nonlinear solver in Simulink such that it is suitable for code-generation (XPC-target). For this I want to convert an existing .mex file into an S-function.

Some background info:

I am using the IPOPT nonlinear solver which is supplied with the OptiToolbox (opensource) compliled as a precompiled .mex file which works perfectly under Matlab. However, to be able to use the solver in XPC-target I need to create and S-function block in Simulink.

Other options I've tried so far:

Since I already have a mex-file I thought it would be convenient to use that inside a simple 'Matlab Function'-block. This works in Simulink, but the code generator cannot compile the Simulink diagram to a real-time executable code.
Creating an S-function in which I call the .mex function. This code cannot be compiled since the .tlc file is missing.

Question

After some search on fora and Matlab central, I found out that I should create a C MEX S-function and compile it. To make life easier, Simulink comes with an S-function builder in which libraries, headers etc. can be added. I failed in constructing one and it is driving me crazy.

I think it would be easiest to convert the .mex function into an S-function (if possible). My question to you therefor is:

Who has experience in converting an .mex function (based on a large set of C++ routines) into an S-function in Simulink

Your help will be greatly appreciated!

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Erivelton Gualter 2018-2-23

Hello Martijn,

Did you have any success with this issue?

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Answer 1

TAB 2012-5-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/39764-convert-a-mex-function-to-an-s-function#answer_49448

It is not at all possible to convert a .mex file into S-function.

Let me clarify something...

S-Function is a C/C++ (also Ada) style routines used in simulink to construct custom blocks with our own logic.
When source code of S-function is built, it generated .mex files which can executed by simulink in the simulation.
The comiled .mex files is for simulation purpose only and it can not support code generation. If you have S-function source, code can generated from it, but it used matlab's SimStruct library routineswhich are heavy and not feasible to use with embedded target.
For proper code generation each s-function should be supported by its in-lining TLC file which is used by RTW to generate code for that particular s-function block.

Now for your issue, you can try this...

If you have C/C++ routines as source (I mean source code of your mex file), no need to convert them all to S-function routine. Simply create a simulink S-function and call your existing C/C++ function in this s-function. You can do this by using S-function builder or legacy code tool. These both tools generates S-function and their inlining TLC files. Once generated, files can be modified as per need.

See...

Example Using S-Functions to Incorporate Legacy C Code

Integrating Existing C Functions into Simulink Models with the Legacy Code Tool

Legacy Code Tool