I have been designing some code libraries for an embedded system that I plan to release soon as an Open-Source software solution for an AVR development board. After finishing the code development (which will probably continue on and on as I add more features), I wanted to start working on documenting the code in some kind of simple help file format that can be sent out with the source code for reference. However, I don't want to have to manually create and maintain the documentation since the code will constantly be updated with new features and so on.
So I started doing some googling around to see what is out there in the way of automatic documentation generators. I have read about quite a few different options but I wanted to know if anyone here has had any experience with such software and if anyone may have any recommendations. Ideally, I was looking to make something that could be compiled into a standard HTML help file with links to different functions and so on. What do you all think?