AVR-Chat

At 11:09 PM 4/10/04 -0400, you wrote:
>protocol with a few bytes of leadin (like ROBIN - see
>http://www.bdmicro.com/code/robin), you might not even notice these
>"glitches".

Very interesting, but the following doesn't make any sense:

0x01 - invalid parameter or command not possible. This would be 
the response if one commanded a node to run at 115200 baud, 
but the node could not actually run that fast. 

How would the node respond if it cannot communicate with the
master? :-)

I use a similar "home brewed protocol" for our equipment, but without
the flags field. The maximum data lenght is 255 bytes but I'm considering
a long packets mode (2 bytes len) because some of our electronic signs
need up to 450 chars. Perhaps I should include the flags field also.
I use 16 bit CRC which is supposed to give bit error check for up to 8Kb
packets. By the way it is not very difficult to use 9 bit mode with your PC,
there is a thread on the subject on Avrfreaks.net. I thought for a long
time that it would be hard without knowing that this facility has been
available with the PC UART for about 20 years, just using a different name.
I'm currently working on a Delphi interface to our products using the 9 bit
data protocol and it works like a charm.

Regards

John Samperi

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