Subject:
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Re: handshaking
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 8 Jun 1998 19:41:03 GMT
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Original-From:
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Curt Mills, WE7U <hacker@tc.fluke.&SayNoToSpam&com>
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Viewed:
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1223 times
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On Mon, 8 Jun 1998 GJZ@aol.com wrote:
> could you please explain to me the details of handshaking? i need to
> understand this before i can go any farther. exactly what is transponded
> during this? and how is this implemented thru assembly language? thank you.
Regarding your earlier message, if you're just wanting to talk to a GPS,
then you don't need handshaking, because I haven't found one yet that
supports it. It is a simple three-wire interface to most GPS's, TX/RX and
Ground. They don't support software-handshaking in/out of GPS's, and the
hardware handshaking lines just aren't present, so that's out too. If you
miss sentences because of any reason at all, tough luck.
What I ended up having to do with my IC programs was optimize them as much
as possible so that I didn't lose many characters. They way I chose to do
that (right or wrong) was to go snag a large buffer worth of characters
all at once, and then run off and process that buffer's worth. I also
couldn't really do much in the way of floating point or anything else that
took up a lot of time. I think my update rate ended up being about once
in four seconds, which means I was losing about half of the sentences at
4800 baud. The key point though is that I didn't lose ANY characters when
I was just concentrating on filling the buffer.
I would then look in the buffer for a particular start sequence (I chose
the RMC sentence), and then process until I found another RMC sentence, at
which point I would throw the rest of the buffer away and go collect
another buffer's worth.
Strange, but it worked.
My next goal is to change over to using GCC as the compiler, so I can get
much more speed out of the Handyboard and do a lot more processing of the
data.
Curt Mills, WE7U hacker.NO_*SPAM@tc.fluke.com
Senior Methods Engineer/SysAdmin
"Lotto: A tax on people who are bad at math." -- unknown
"Windows: Microsoft's tax on computer illiterates." -- WE7U
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Message is in Reply To:
 | | handshaking
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| could you please explain to me the details of handshaking? i need to understand this before i can go any farther. exactly what is transponded during this? and how is this implemented thru assembly language? thank you. Justin D. Gullotta.. , (...) (26 years ago, 8-Jun-98, to lugnet.robotics.handyboard)
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