I'm at a beginner at this AVR stuff, and I have some questions on really basic stuff. I would really appreciate your help. Anyway, here are some of my questions:
1) In some of the gcctest c files, I have noticed that there is SIGNAL(SIG_OVERFLOW0) function. I have no idea where this is called in the main function. I suspect sei() calls it. If this is so, what exactly does sei() do, and if not, where is SIGNAL(SIG_OVERFLOW0) called?
2) What is the difference between outb(), outp()? What function(s) do I need to use to get input through the switches (PIND)?
Thanks for you help! :)