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 here. 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.
2007/2/9, Elias Crespin <ecresping@gmail.com>:
I had read the wiki but from the picture and the info there, it is not clear that the robostix is actually attached to the gumstix while programming it, so I wanted to double check.
You are so kind to share your time and knowledge. I hope in some time I can contribute as well.

2007/2/9, Chris Danis <cgd3@cornell.edu>:
On 2/9/07, Elias Crespin < ecresping@gmail.com> wrote:
> 1. What interface options do I have to comunicate from gumstix to robostix
> at the software level? I've read some about it but, I just want to know what
> an experienced gumstixer/robostixer would say.

There are several options:
- serial port
- I2C

Serial or I2C would be easiest.  SPI is fastest.

> 2. Can I program the robostix attached to the gumstix directly or would I
> need other interface between them ?

This is covered very well in the wiki:



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Elias Crespin

Elias Crespin