Re: gEDA-user: My current project

[Dave McGuire <mcguire-atMUNGEDneurotica_dot_com>]

On May 7, 2007, at 1:03 PM, Levente wrote:
> I'd like to give you a summary about my ongoing project. I am  
> designing a bus
> system with RS422/RS232 interfaces. It is going to be a general  
> purpose packet
> forwarding system built up by cheap devices.
>
> You can find more information on the topic here:
>
> http://web.interware.hu/lekovacs/lbus/index.html
>
> Any idea, question, suggestion are welcome.

   I looked over your protocol (I have a background in protocol  
design) and I like it...clean, simple, and explicitly defined.  I do  
have a couple of suggestions, though.  Most of these are geared  
toward extensibility...If you think about it, some of these things  
may not be needed now, but if the protocol design withstands the test  
of time, you may find yourself using it in applications for which it  
was not originally intended, and designing in some extensibility now  
may save your butt later.

     - Add an octet following FLAG to contain the protocol version  
number.

     - If you add a two-octet field to contain the length of the data  
field, you will likely find that it eases the design of the firmware  
that parses the packets.

     - If you add a "sequence number" field somewhere in the header,  
it could be used to send PDUs that exceed the maximum data field size.

     - It might be useful to define a "broadcast" address that all  
interfaces will receive, for things like a "reset" function, etc.

             -Dave

-- 
Dave McGuire
Port Charlotte, FL




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