MATLAB: How to use Legacy Code Tool to create a Simulink S-function block with multiple output ports in Simulink 7.0 (R2007b)

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I want to use Legacy Code Tool to create a Simulink S-function block with multiple output ports in Simulink 7.0 (R2007b).

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In order to create a S-function block with multiple output ports from existing C code using Legacy Code Tool, the specification has to be provided in the "OutputFcnSpec" field of the LEGACY_CODE structure. An example implementation is shown in the attached files.

The function "lct_simple_demo" uses the existing C-code "myfunc.c" to create a S-function block with multiple ports. This S-function block is used in the demo "lct_demo.mdl" model.

To run the function, type the following at the MATLAB command prompt:

lct_simple_demo

Multiple outputs from an existing C-code can also be obtained by using a "bus". An example implementation of the same is shown in the demo "Calling Legacy Functions with Structure Arguments Using Buses". To view this demo, type the following at the MATLAB command prompt:

showdemo sldemo_lct_bus_script

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MATLAB: How to generate code from the system I’ve designed in the fuzzy logic designer

To generate code for your fuzzy logic system, you will need to bring the logic into a Simulink system. This process generally follows these steps:

Create your fuzzy system using the fuzzy system designer. Once complete, <https://www.mathworks.com/help/fuzzy/building-systems-with-fuzzy-logic-toolbox-software.html#FP686 export the system> to the MATLAB workspace by selecting File > Export > To Workspace.
Bring your exported fuzzy system variable into Simulink using a "<https://www.mathworks.com/help/fuzzy/fuzzylogiccontroller.html Fuzzy Logic Controller>" block. <https://www.mathworks.com/help/fuzzy/generate-code-for-fuzzy-system-using-simulink-coder.html This PID control example> demonstrates this. If you open the model from this example, you will notice a structure named "FIS" in the MATLAB workspace. This is a structure that had previously been exported from the fuzzy logic designer. "FIS" was then brought into Simulink using a fuzzy logic controller block named "Fuzzy Inference System" within the subsystem "Fuzzy PID". In the fuzzy logic controller block, specify the name of your fuzzy logic structure (here, it's "FIS"). From here, you can simulate the model and see how the fuzzy logic controller works, given specific inputs.
When you have completed your model and are ready to generate code for the model, click on the "Build Model" button (or Ctrl-B). When the build process has completed successfully, you will see a new folder in your current folder named "fuzzyPID_grt_rtw". This folder includes all the generated source and header code files your model. Refer to the previously-linked example documentation to read more about the specific files generated.

Note that you will need a Simulink Coder license to generate code for your fuzzy logic system.

MATLAB: How to write the C S-Function in order to have non-virtual bus (with different data types inside) as input in Simulink 6.6 (R2007a)

The ability to use buses as input or output of an Hand-written C MEX S-function is not available in Simulink 6.6 (R2007a) as mentioned in the documentaiton :

 <http://www.mathworks.com/access/helpdesk/help/toolbox/simulink/index.html?/access/helpdesk/help/toolbox/simulink/sfg/brgo03i-5.html>

To work around this, you can use Legacy Code Tool to import existing C code by looking at the following demo 'Calling Legacy Functions with Structure Arguments Using Buses'. You can open this demo by typing the following on MATLAB Command Prompt:

sldemo_lct_bus_script

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