max7219, tutorial mistake?

sorry about that, but the confusion will quickly go away once you see the first led's light up Smiley

really not, i understood all of things but i need to start and interact with it.
Now i have a 3x3 matrix prototype, i'm waiting for leds(shipped from honk kong). however it work correctly, now i want to learn how can i interact with this prototype in real time.

i think that i must use software like processing or pure data but i have not idea about how can i do this, can you suggest me some stuff like code tutorial, or topic overview?

Thabnk for all.