Subject:
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Re: Automatic Gain Control
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 3 Jan 1999 23:01:27 GMT
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Original-From:
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Laurentino Martins <(lau@mail)SayNoToSpam(.telepac.pt)>
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Viewed:
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3839 times
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> > Could it be that the AGC value is a measure for the distance between the
> > tower and the Cybermaster? Would the data you have gathered support this?
>
> No, I would say definitely not. To me it seems like the tower increases the
> power when it has to retransmit, and tries to lower the power when
> everything works. So the reading is only connected to 'connection quality' I
> think. We had the highest reading with a short distance (3m) but the toilet
> (pipes and water) was between the tower and the MU. Going upstairs to the
> other end of the house lowered the reading again (and moving the MU just
> near the tower showed the lowest reading).
I remembered once something Dave told me: AGC is unsafe if used inside NQCC.
His words:
------------------------------------------------------------------------------
The AGC() macro is the only one to use a 5 bit selector code (0x10). For many instructions (such as tests), the selector code must be fit into 4 bits.
I would avoid using it within conditions. If you want to make a decision
based on the AGC value, assign it to a variable first, then test...
int foo;
task main
{
foo = AGC();
if (foo == 0)
{
... do something...
}
}
If you use AGC() directly in a test ("if (AGC() == 0)"), then there's a
chance that it will be assigned to the 1st argument of a test opcode, which
only supports 4 bit source types.
------------------------------------------------------------------------------
Laurentino Martins *<||:-)
[mailto:lau@mail.telepac.pt]
[http://www.terravista.pt/Enseada/2808/]
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: Automatic Gain Control
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| Here's Anders Isaksson's anwer to the automatic gain control question. He emailed it to me directly but gave permission to post it, since I don't think many people know this: (...) No, I would say definitely not. To me it seems like the tower (...) (28 years ago, 3-Jan-99, to lugnet.robotics)
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