In some circumstances it is desirable to replace code generated by MC-3020 with code supplied by the user. This is often the case with the timer subsystem (TIM) in TIM_bridge.c and almost always the case with the system user callouts (sys_user_co.c and sys_user_co.h). In these cases, replacement source files must be supplied to the code generation process.

To supply user source code that will replace files of the same name generated by MC-3020, place the source files (.c and .h) in the gen folder within the project folder. When the code generation process runs, the supplied files will be copied in to overwrite/replace those generated by the model compiler.