Project-specific settings (like which board you’re using) are outlined in this brief Makefile that then includes the larger Makefile which contains the actual nuts and bolts for building your code.

Next, I’ll walk you through some makefiles that can be used for real-world microcontroller code development.

Kinda new at makefiles, and I've been struggling with this problem for a while now. How do I get makefile to work with just a specific subset of files located in a source folder?