The RGB LED matrix panels can be scored at Sparkfun, AdaFruit or eBay and Aliexpress. If you are in China, I'd try to get them directly from some manufacturer, Taobao or Alibaba. The RGBMatrix class ...

And I cannot get it working with any configuration. However neither of suggestions in them seem to work and the supplier can't provide me a schematic or datasheet for the device. For D0: All --led-row ...