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'[PIC]: 12C509A web server ????????????'
2001\11\16@064332 by Russell McMahon

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I suspect this is both less than it seems and probably already known about
but ....

I stumbled across this while on another search. This is simply one slide in
a presentation but the claimed capabilities sound interesting.
Anyone know more about this ?


www-fp.mcs.anl.gov/~stevens/all-presentations/capstone-vis99/tsld024.
htm


Ah - here we are - IPIC web server

       http://www-ccs.cs.umass.edu/~shri/iPic.html


TCP/IP stack
RFC-1122 compliant
HTTP 1.0
Direct SLIP connection at 115200 bps

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2001\11\16@100844 by Dale Botkin

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The mere fact that he claims to be doing bit-baged serial at 115.2Kbps on
a 4MHz 12C509 makes me highly suspicious, to say the least -- as does the
fact that the page has been up for a couple of years at least with no
further detail, no active demo, no nuthin'.  I'd have thought if this were
for real we'd have heard more about it.

Dale
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On Sat, 17 Nov 2001, Russell McMahon wrote:

{Quote hidden}

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2001\11\16@103608 by Tim Hamel

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Funny, there was a post about this on comp.arch.embedded. I had to reply, and
similiar to yours except...

(from the page - http://www-ccs.cs.umass.edu/~shri/iPic.html)
"At 115200bps, the web-server should be able to service about 7200 hits
per hour, give or take some. The code
itself spends most of its time sitting in the UART which is implemented
by bit-banging. Were I to interface it to a
PLIP instead of SLIP, and use a Scenix 100MIPS chip in turbo mode..."

Now obviously, a 12C509 couldn't do 115.2kbps @ 4Mhz and you couldn't
have the bit-bang code AND other stuff fit in 256 bytes. So....keywords
here, "Scenix 100MIPs chip.." which might imply that THAT chip is doing
all the work.

-Tim Hamel

In a message dated 11/16/01 7:09:32 AM Pacific Standard Time, dalespamKILLspamBOTKIN.ORG
writes:


> The mere fact that he claims to be doing bit-baged serial at 115.2Kbps on
> a 4MHz 12C509 makes me highly suspicious, to say the least -- as does the
> fact that the page has been up for a couple of years at least with no
> further detail, no active demo, no nuthin'.  I'd have thought if this were
> for real we'd have heard more about it.
>
> Dale
>

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2001\11\16@105357 by M. Adam Davis

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This came out well over a year ago, and there was quite the discussion
on the piclist about it.

What it boiled down to was all the links on it were referred to with
port numbers, ie
http://www.somepicsomewhere.com:1020/somedocument.html

The kicker was that it didn't matter what document name you specified.
It took the port number, and sent back all the memory from that number
to an EOF character in a single packet.  A quick and dirty way of
serving web pages, but that bit about http compliance may be pushing it.
Could be counted as a weakness, though, since you can read every byte
from the eeprom, and there are a finite number of port numbers (0-65536,
IIRC) so you can only serve a total of 65k data.

There are other webservers on PICs, but most are limited to sending only
one packet (so each page/image has to be less than 1k).  This is the
only one that does the port number trick, IIRC.

Being based on a slip connection isn't so great for general web apps,
either.  If you have to have a computer move data from ethernet to slip
just to make a pic go, you might as well scrap tcp/ip on the pic and
make the computer translate from tcp/ip over ethernet to a simpler
protocol and rs485.  The pic certianly doesn't need the capabilities of
tcp/ip.  You could argue that IP alone would still be over doing it.

Interesting project though.  It encouraged a lot of other people to do
the same and better.  There are projects floating around out there that
hook an f877 to ethernet cards and chips with full tcp/ip stacks.  Check
out the latest online circuit cellar for an ongoing project in that vein.

-Adam



Russell McMahon wrote:

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2001\11\16@105456 by Tsvetan Usunov

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>TCP/IP stack

LOL

>RFC-1122 compliant

ROTFLOL

>HTTP 1.0

LOLMAO

>Direct SLIP connection at 115200 bps

ROTFLOLMAO

So why these silly peoples around are still useing embedded Linux with at
least 1MB RAM to implement TCP/IP stacks?

Cheers
Tsvetan
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2001\11\19@103949 by Micro Eng

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or that it is simply serving a link to a real website...so all the traffic
is just going in and out thru it...

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