Eric, When you work with an Open Source project, you are not expected to need documentation of the overall structure of the code, or a list of the essential files, or a timing diagram, or an explanation of the interrupt priority (we already told you it's a busy loop, which means there is no interrupt priority).
You are expected to read the code and figure all of that out for yourself. The code is actually not all that difficult. Think of it as a test. You might not be ready to work on this sort of project. Sorry Bruce
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