Yikes!..
lol.. thats alot to digest (never played with SPI interface before... not the MAX7221 driver chip)..
I am still working on the physical/wiring of it all (in my head)..
so I can understand how to get it working with an led type layout for the matrix wiring..
is there a difference or benefit between the two diagram proposed?
And also 'are there' any libraries made for the MAX7221 chip for easy interfacing? (methods/functions to use) just curious.
I'll take a look at the code samples you provided when I get the actual code/testing part.
thanks