How to let Max/MSP talk to a couple of MAX7219

Hello there, for my thesis project I need to use Max/MSP to control a 4*32 matrix of LEDs. So I did the tutorial about the Max7219 on the arduino website and everything works, then I used Maxduino to have Arduino talking with Max/MSP, and everything works. Now the problem is how do I use Maxduino to control the two Max7219??

I know that for some of you this question might looks stupid but I feel quite lost in all those lines of code... Any help?

Thanks, Luca