Calling external C codes in MATLAB Function block

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Saeed Soltani 2016-7-7

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编辑： BhaTTa 2025-4-17

Hi, I am modeling an automotive system in Simulink. There are large amount of pre-written C codes which I have to call them in MATLAB Function blocks. As far as I know there are different methods to call an external function in MATLAB, like making MEX file or using Legacy Code Tool. Also I recently noticed that coder.ceval function is used in some similar cases. Since there several C code files and they have also dependencies, I am not sure which one is more efficient or possible in this case. Any idea would be greatly appreciated. Thanks.

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BhaTTa 2025-4-17

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https://ww2.mathworks.cn/matlabcentral/answers/294117-calling-external-c-codes-in-matlab-function-block#answer_1563790

编辑：BhaTTa 2025-4-17

Hey @Saeed Soltani, you can use below technology to model your system and call appropriate C functions:

S functions: https://www.mathworks.com/help/simulink/create-cc-s-functions.html

C function block: https://www.mathworks.com/help/simulink/integrate-external-c-algorithms-using-c-function-block.html

System Objects: https://www.mathworks.com/help/matlab/system-objects.html

Below i have attached one such example of calling external C functions:

https://www.mathworks.com/help/simulink/supportpkg/arduino_ref/dht11-relative-humidity-temperature-io-device-builder.html

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MATLAB External Language Interfaces C with MATLAB Write C Functions Callable from MATLAB (MEX Files)

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