Subject:
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RE: Which terminal on Linux? plus random thoughts.
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Newsgroups:
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lugnet.robotics.rcx.pbforth
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Date:
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Thu, 4 May 2000 16:47:43 GMT
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Viewed:
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1168 times
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> Also I'm currently fiddling with some simple communication
> tools in Tcl but I suspect that I am covering otherwise
> well travelled ground. Does anyone have example Tcl code that
> they can share with me. After a hour or so of experimentation
> (mostly finding documentation on setting up the serial port
> in Tcl) I can send to the RCX but can't read yet.
I have beta quality Tcl code that sends an SRECORD firmware
imge up to the RCX (fast or slow) and has basic terminal
capabilities. It also strips comments and whitespace out of
files as they are uploaded to reduce the time. I'd like
to put a Tk wrapper around it real sson now...
Ernst de Ridder has provided me with the skeleton of
a line-based checksumming protocol, which is turned on
by a special leadin character and is otherwise invisible
to a dumb terminal.
> The following is mostly blather and thinking out loud.
>
> My goal is a set of Tcl procs that support simple
> communication, hiding the echo, delaying where necessary
> etc. that can then be used in developing PC code that talks
> to forth code in the RCX. On top of that I will build a
> simple command/response protocol with a null command mostly
> to tickle the tower and keep it awake. What I mean by
> command/response is that the RCX will remain silent unless
> asked for data. If the RCX has anything to say it will be
> buffered until the PC asks for it. I choose this method
> because it is extremely easy to implement in a half duplex
> environment. If it is not simple realistically I will never
> get it done.
I hear that. Keep it simple, and if it works, then optimize
if necessary.
> On top of that simple com layer I will make a simple
> command interface which will allow me to invoke one of
> a selection of forth words. I'll use a simple command
> packet structure something like:
Let's have some discussion on an additional layer of protocol.
I'm especially interested in this for a classroom environment
where multiple RCXs can be talking at once.
I think that the likelyhood of collisions during a debug session makes
it imperative that the bot's are simply covered when talking to the tower.
Keep it simple, right :-)
The protocol you described is shockingly similar to XMODEM, which is tried
and true. Sergey Udovenko was kind enough to supply XMODEM words for the last
release of pbForth.
Cheers,
Ralph Hempel - P.Eng
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Check out pbFORTH for LEGO Mindstorms at:
<http://www.hempeldesigngroup.com/lego/pbFORTH>
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Reply to: rhempel at bmts dot com
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