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An update on this: as of R1.3 (October 2008) X renders on both framebuffers. Java apps, however, still render on only display 0.

Has anything changed in R1.4.1 w.r.t. supporting multiple BUGview modules in Java? Is this possible?

BUG supports multiple LCDs on the same side, but not back to back.  The data buses go through the connectors from one side to the other on the BUG. So you can attach two LCDs in a row, in slots 0 and 1, or slots 2 and 3.  But not slots 0 and 2 or slots 1 and 3.

Yes, I understand there are hardware limitations that restrict how two BUGviews can be placed. But the Java framework places additional restriction on how the BUGview modules can be used.

Here are my test results:

Single BUGview module with no app running
: works in all 4 slots.



Dual BUGview modules with no app running:


Slots 0 and 1: two independently working screens

Slots 0 and 2: 0 works, 2 is blank

Slots 0 and 3: two independently working screens

Slots 1 and 2: two independently working screens

Slots 1 and 3: 1 works, 3 is blank

Slots 2 and 3: two independently working screens

Upshot: can’t do direct back-to-back, but either two modules on the same side or staggered on opposite sides work.

Now, when running the basic Java GUI example from http://bugcommunity.com/wiki/index.php/Create_a_basic_GUI I get the following results:

Single BUGview module with basic Java GUI example:

Slot 0 – works fine

Slot 1 – Colored noise (see http://community.buglabs.net/forums/8-BUGmodules/topics/273-BUGview-Slot-Restrictions
)

Slot 2 – works fine

Slot 3 – Colored noise

Dual BUGview modules with basic Java GUI example:

The only combinations that could work, if we believe that the above results generally hold are 0 and 1, 0 and 3, 1 and 2, 2 and 3:

Testing 0+1 resulted in blinking white screen + blinking blue LEDs = unhappy BUG; I had to power cycle and cannot get the application to start up again. Still working on this…

So my real question is: is there a way to use two BUGview modules with a Java application, and how do I address the two screens independently in the Java API?

Just to be clear, with a single module attached you should never see colored noise.  The suggests a possible hardware problem.

With regard to using two screens within a single java app, there is a limitation of the phoneME=>QT bindings that only allows for one instance of xserver to be rendered to at a time.  What this means practically is that one instance of the java process will render to one instance of the xserver process.  There is no way to have a single java program render on both LCD screens.

Thanks for the clarification – that was my impression, too, that’s it’s currently impossible to render to two screens from a Java app. My project doesn’t actually require graphics output on two screens – I’d love to show output on one, but sense touch input from the other, using it only as an input device. Any chance that may work from Java (my sense is no)?

It’s definitely technically possible.  You could run one java app on one process and use sockets to communicate between instances of the vms, but they wouldn’t both be bugapps in the usual sense. 

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