Another possible way.  I’ve split one serial line to multiplex before between two devices.  Might work with 3 too….I never tried it.

 

Every TX goes to every RX line.  All gnds must be common.  So each gumstix has a 1-to-3 line out (TX line goes to other 2 plus itself).  This is a loopback method just hooked up to the other gumstix too.

Then you pass around a token for control of the serial line.

The transmitting node will see its own message but that’s OK.  You just solve that in software.

 

 

___________________

Michael D. Black

Essex

black@essexcorp.com


From: gumstix-users-bounces@lists.sourceforge.net [mailto:gumstix-users-bounces@lists.sourceforge.net] On Behalf Of Heilpern, Mark
Sent: Wednesday, December 05, 2007 3:41 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] hi

 

I don’t know of any websites that would help. By “costless”, I assume you mean you want to purchase as little as possible.

 

If I were to implement something like this I would possibly run serial between devices, so each device would have to be a Gumstix + one of the serial-equipped breakout boards. This would require two ports on one device (in the middle), and one port from each of the endpoints. As the PXA 2xx has three serial ports, this is doable on the Gumstix. You may find more specific serial port detail at http://docwiki.gumstix.org. That site will have hardware details but it won’t address how you attach the boards together, nor will it address the software end of things; I don’t know of a site to bring that project together for you.

 

 


From: gumstix-users-bounces@lists.sourceforge.net [mailto:gumstix-users-bounces@lists.sourceforge.net] On Behalf Of Donny George
Sent: Wednesday, December 05, 2007 4:31 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] hi

 

hello again

my main purpose would be to make costless multihop communication between 3 gumstix. so if this is the case what would be the suggestion and would there any website link which helps beginners like me to execute  such a scenario in totality

donny


On Dec 5, 2007 10:21 PM, Heilpern, Mark <mark.heilpern@authentec.com> wrote:

There's a rather broad number of ways you can communicate between
systems; without knowing the factors of your application it's difficult
to recommend something. You could use wired Ethernet, wireless Ethernet,
serial, SPI, Bluetooth, some sort of GPIO-rigged mechanism. For
implementation of a chat server sort of application, one of the Ethernet
types is probably the best choice... and you would likely be able to
simply take existing code and recompile it for the Gumstix. (Don't
forget that typically for that sort of application, you need some sort
of server as well.)

-----Original Message-----
From: gumstix-users-bounces@lists.sourceforge.net
[mailto:gumstix-users-bounces@lists.sourceforge.net] On Behalf Of don
008
Sent: Wednesday, December 05, 2007 4:14 PM
To: gumstix-users@lists.sourceforge.net
Subject: [Gumstix-users] hi


i would like to know if there is any method in which messages can be
sent
across two or three gumstix, this is not to be confused with transfer of
files. this can be similiar to chats where one user enters a message and
the
other one gets it and vice versa. could anyone help me with this

donny

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NOTE: The information in this message is intended for the personal and confidential use of the designated recipient(s) named above. To the extent the recipient(s) is/are bound by a non-disclosure agreement, or other agreement that contains an obligation of confidentiality, with AuthenTec, then this message and/or any attachments shall be considered confidential information and subject to the confidentiality terms of that agreement.  If the reader of this message is not the intended recipient named above, you are notified that you have received this document in error, and any review, dissemination, distribution or copying of this message is strictly prohibited. If you have received this document in error, please delete the original message and notify the sender immediately.

 

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