How to keep user code remained after rebuiding model/regenerating code?

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Hi everyone,
I'm using Simulink to automatically generate code. After code generation, my user code will be added into a source file (for example main.c). But once the Simulink model has been rebuilt, all the user code is deleted, so that I have to write it every time.
I wonder if there is a way to keep user code remained after rebuiding the model/regenerating code?
Thanks a lot!

Accepted Answer

Birdman on 21 Nov 2017
Go to Configuration Parameters->Simulation Target and there you will see two sections. Try to include your user code to source file or header file and see the results.

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