Hey Thorsten,
the LED digits are simply connected to DOUTs, no MAX7221 involved here. They should work once I find time to configure my NGC-file.
But there are lots of small buttons, each with a small LED above them. All these LEDs are connected to three MAX7221. They are configured in matrices, so each MAX7221 is connected to a 8x8 LED matrix (well, more like 8x7 and 8x5, since there are less than 64 LEDs per matrix).
With my PIC-core I basically used your stribe-project (with a slight modification you told me) and was able to address every single LED. The mapping was a bit "all over the place" but it all worked.
If you need more details, let me know.
Thank you,
Lars