I finally have the gumstix driving the 64 motor artistic piece. After LOTS of experimentation with UART, i2c and SPI communications between the gumstix and the robostix, I ended up directly using the gumstix GPIOs for interfacing with the "64 motors art piece". The reason for not using the robostix to drive the motors was that I could not make the communications between the gumstix and the robostix transfer fast enough for the movement of the motors to be smooth enough. At the end I decided to use the GPIOs in a Parallel Port fashion. You can see a video
. In the last two or three frames of the video you can see the gumstix to your left.
It works really well and stable. Great piece of hardware!!! Congratulations Gumstix guys. I canīt wait to put my hands on one of the new Verdexes.
Thanks for all the help received.