AVR-Chat

> I'm pretty sure this table is right.

And what I often do is write a little C program which I compile on my
PC that I use to generate source code for tables like this (or CRC
lookups etc).

I typically include the C program #if 0'd out in my source file that
uses it as a way of documenting how the table was actually created.

If you don't want to use 256 bytes for the lookup table, you could
also do a pair of (or a single) 16 byte lookup table which flipped 4
bits. Now you have a pretty wide execution time/space tradeoff and you
can picks what's appropriate for your project.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/