how do I override rt_main in embedded coder?

Using embedded coder to generate code, I want to exclude rt_main.c from the build and use my own customized version (since the one that gets included does not actually run any of my code). I see that I can generate an example main program (ert_main.c) but I don't see how I can incorporate my customized version of that file into the build. I can add my own main function to the build, but then I get a linker error because main is defined twice. How do I write a customized main function?

Answer 1

[Vandit]

Hi,

To modify main function ‘ert_main.c’, you can navigate to ‘Model_Name_ert_rtw’ folder and customize ‘ert_main.c’ file as per your requirements.

Now to generate a new executable, please refer to the steps shown below:

1. Inside the ‘Model_Name_ert_rtw’ folder, delete all ‘.obj’ files.

2. Delete the already existing ‘Model_Name.exe’ file from your current working directory.

3.Run the ‘Model_Name.bat’ file by running the command ‘!Model_Name.bat’ in the command window to generate the executable again.

Hope this helps.

[Paul]

Hi, thanks for answering.

I was looking for an automated way to do it. Obviously I can edit the generated ert_main.c and re-run the build. I don't want to do that every time I build using simulink.

What I ended up doing was turning off "generate an example main program" and in the ert_make_rtw_hook.m, when before_make is called, I look at the buildInfo and find rt_main.c, and if it's present, replace it with my own file.

[serena aiello]

Hi Paul, I want to do the same thing. Do you have find an automatic solution?

[Paul]

Yes, something like this should work in your ert_make_rtw_hook.m

function grt_make_rtw_hook(hookMethod, ...

modelName, ...

rtwroot, ...

templateMakefile, ...

buildOpts, ...

buildArgs, ...

buildInfo) %#ok<INUSL,INUSD>

switch hookMethod

case 'before_make'

% Called after code generation is complete, and just prior to kicking

% off make process (assuming code generation only is not selected.) All

% arguments are valid at this stage.

%sldiagviewer.reportInfo(getFullFileList(buildInfo));

buildInfo.Src.Files.FileName

index = find(strcmp({buildInfo.Src.Files.FileName}, 'rt_main.c'))

if (length(index) > 0)

rt_main = buildInfo.Src.Files(index)

rt_main.FileName = 'main.c';

firstFile = buildInfo.Src.Files(1)

rt_main.Path = fileparts(firstFile.Path);

end

end