Hi,
please have a look into the provided Build Environment, which contains (in most cases) an example called DeviceIntegration. It demonstrates how to set data on the underlying system (e.g. switch on/off a LED) and how to push data from the underlying system to the GUI application (e.g. when the user presses a hard button).
The adaptation is implemented within the file DeviceDriver.c and the declaration can be found in the file DeviceDriver.h. This file is included by using inline code.
Please note, that this is only necessary for the generated code. The include is placed into the generated C code. The search path depends on your toolchain and has to be set usually by project settings inside the IDE.
Does this answer your question?
Best regards,
Manfred.