Solved
using CUBEMX to generate makefile type project output (custom .h .c files)
Is there a way to include in the makefile out custom .c .h , other than manually including each .c by hand in the makefile C_SOURCES?

Is there a way to include in the makefile out custom .c .h , other than manually including each .c by hand in the makefile C_SOURCES?

Yes. Since recent CubeMX versions can specify a post-generate command, this is how you can modify the generated output and add your files. Also see the CubeMX user guide UM1718 on the .extSettings file.
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