C code to S function tutorials

2014 1 20
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更新时间：2014 3 25
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Hi does anyone have any good tutorial examples that i can use to get to grips with using the legacy code toolbox ?
I have some C code and I want to learn effective ways to to turn it into S code to put in my simulink model. This model will eventually be working on a real time machine.
I have been told that the legacy code tool box is my best candidate. Does anyone have any informative tutorials that might help ?

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Suneesh
Suneesh 2014-1-20
编辑：Suneesh 2014-1-20

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There are several examples in Simulink documentation for the legacy code tool. Look under "Custom Blocks with S-functions, System Objects and Legacy Code Tool" in:
http://www.mathworks.com/help/simulink/examples/index.html#industrial-automation-applications
Do consider the S-Functions mentioned in Bruno's answer as well and choose the solution which seems more suitable for you.

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Bruno Pop-Stefanov
Bruno Pop-Stefanov 2014-1-20
编辑：Bruno Pop-Stefanov 2014-1-20

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I am not familiar with legacy_tool but there is another way to create an S-Function from C code.
You can call a binary from a Simulink model using MEX files. A MEX file is a binary compiled from C, C++ or Fortran code that is properly formatted to work with MATLAB code. Here is a short introduction:
Implementing S-Functions
and here is good starting point in the MATLAB documentation:
Introducing MEX-Files.
Paul
Paul 2014-1-22

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Thanks guys
I used the example to create an s function but then attempted to use the model wizard to compile the simulink model into my target machine but it comes up wth the error :
S-function 'ex_sfun_doubleit' in 'untitled/ex_sfun_doubleit' specifies option SS_OPTION_SFUNCTION_INLINED_FOR_RTW however a 'ex_sfun_doubleit.tlc' file could not be located in the current working directory, the S-function directory 'C:\Users\HIL\Documents\MATLAB\LEGACY_TEST', or the directory 'C:\Users\HIL\Documents\MATLAB\LEGACY_TEST\tlc_c'
can some one explain ?

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Kaustubha Govind
Kaustubha Govind 2014-3-25
As the documentation states, you also need to run legacy_code('sfcn_tlc_generate', def) in order to generate the ex_sfun_doubleit.tlc file.

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