Subject:
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Re: Setting LNP host address
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Thu, 23 May 2002 15:23:17 GMT
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Viewed:
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2132 times
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In lugnet.robotics.rcx.legos, Ted Hess writes:
> I've experimented with a couple of choices which were relatively easy to
> implement. Let me know if we should keep any these:
>
> 1. You can choose to set the host address at build time with a command-line
> option to make.
> <snip>
>
> 2. I have added a new protocol message to program.c and added a new command
> to dll that will dynamically change the RCX host address when invoked.
> <snip>
>
> Do you all think it is still important to be able to set the LNP host
> address during system image download (firmdl3)? These features seem to fit
> the need and modifying firmdl3 to modify the image is a bit messy.
Joe Woolley prototyped the firmdl3 mods, I think, and has now a user
program which can change the Id. This now makes 4 approaches we
have to consider ;-)
My thinking on firmdl3 use was that it is a direct replacement for
compile time set that we have today. It seems to me that we want a
fixed id in each bot so that only one is listening to
downloads/messages, so they can talk "amongst themselves", etc.
(yeah, I know, this is probably obvious :) However, I came to this
thinking rather simply. In looking for other patterns it seems to me
that host id is one of those things that would normally be a set of
dip-switches on the back panel of equipment, for example.
When I first heard that we ask users to recompile legOS for each
id, that struck me as obviously wrong. It also struct me that setting
it at kernel download time was the next best approach. It also occurred
to me that we might have a concern for being able to load the exact same
kernel in different bots and rebuilding the kernel made it easier to
be not the case.
One final set of thoughts. Helping us build an "intuition" of how to use
the tools. I come to firmdl3 being the logical place for the ID set for a
couple of reasons: (1) one must set the id each time a kernel is downloaded,
(2) I don't think of a program that needs to specify the target id for a
download as the logical place to set the host id of the bot to which i
then must download as the intended target. That is to say, firmdl3
intuitively made more sense... I also acknowledge the need to change
the id once it has been set. I don't think this eliminates firmdl3 as
the tool from which to do this, however.
I know this is kind of a stream of conciousness writeup (barely a
natural flow... ;-) but does this make sense? Is there anything here
to guide us? I simply offer it as more to think about and discuss
before we make the choice.
Regards,
Stephen
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Message has 2 Replies:
 | | Re: Setting LNP host address
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| At first, it seems logical that firmdl3 would be the best place to make the change. However, it was very easy to allow the Host ID to be changed at runtime. Whether changed by a user program or changed via the RCX buttons/lcd, it is easy enough to (...) (22 years ago, 24-May-02, to lugnet.robotics.rcx.legos)
| | | Re: Setting LNP host address
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| (...) Why not allow all 4? 1. Have a build option that the variable is set to by default; 2. An option on firmdl3 over-rides this if required; 3. An option on dll over-rides this if required; 4. An API (macro or in-line sub) to set it from a user (...) (22 years ago, 24-May-02, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Setting LNP host address
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| I've experimented with a couple of choices which were relatively easy to implement. Let me know if we should keep any these: 1. You can choose to set the host address at build time with a command-line option to make. Example: make LNP_HOSTADDR=2 (...) (22 years ago, 20-May-02, to lugnet.robotics.rcx.legos)
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