Why am I getting the following error while trying to generate an S-Function from a submodel?

It appears to me that the compiler fails to generate the following file. I unfortunately do not understand the underlying issue.

[KALASH]

please attach your model and code

Answer 1

[Yatharth]

Hi Chriag,

The error you're encountering, "fatal error: rt_zcfcn.h: No such file or directory," during the S-Function generation from a submodel, is typically due to the build process not being able to find the specified header file (rt_zcfcn.h). This file is associated with the zero-crossing functionality within Simulink models, particularly when certain blocks that require zero-crossing detection are used.

If you are using a triggered subsystem or blocks or features that require zero-crossing detection, try removing it and see if the issue is resolved.

Attaching a reference example for you

https://www.mathworks.com/help/rtw/ug/generate-code-for-an-elapsed-time-counter.html#:~:text=zcEvent%20%3D%20rt_ZCFcn(RISING_ZERO_CROSSING

and Documentation for Zero-crossing detection

https://www.mathworks.com/help/simulink/ug/zero-crossing-detection.html

In case you still face any issue I would suggest contacting the MathWorks support as the debugging might require you to share your model.

https://www.mathworks.com/support/contact_us.html?s_tid=bug2create