Over the years I’ve written a few fairly lengthy tutorials relating to AVRs. Originally, I posted these over on the AVRFreak’s Tutorials forums, but after many requests for PDF versions and after becomming frustrated at the lack of typesetting expressiveness given in the forum software, I converted over the text into LaTeX.
Now the tutorials are available in PDF form, and can be freely redistributed under an MIT license. I’ve even put up a public mirror of the tutorial LaTeX source SVN repository, so that others can fork off and examine past revisions of the files as I update them in the future.
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I used these a few weeks ago, they were very helpful. Having been only using the Arduino environment for programming I had become rusty at AVR programming, but I think the current AVR studio is a nice upgrade from Codevision I learned on, and the ATtiny13 datasheet I was using a few weeks ago is a much easier read than the ATmega324p datasheet i learned on.