To automatically copy the necessary source files to your build directory, you can use the "Include files" option in the "Code Generation" pane of your Simulink model.
First, select "Code Generation" from the "Model Settings" menu. In the "Code Generation" pane, scroll down to the "Custom Code" section and expand it. Then, select "Include files" from the list of options.
In the "Include files" field, you can specify a list of file names or wildcard patterns that should be included in the build process. For example, if all your C functions are in a directory called "my_functions", you can add "my_functions/*.c" to the "Include files" field.
When you generate code using Embedded Coder, it will automatically include any files specified in the "Include files" field in the generated code. You can also specify additional directories to search for included files using the "Additional include directories" field in the "Code Generation" pane.
Note that if you have multiple S-Function blocks in your Simulink model that use different sets of C functions, you may need to create separate "Include files" entries for each set of functions.
