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'[PICLIST] [PIC] PIC-webserver + 16F84-04/P'
2000\08\15@101322 by lucky

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face
I was interested in some "small webserver" projects using PIC. I just
bought this uC & found out that the frequency range (4MHz) might not meet
the specification required for most of these projects (typically most of
them working on 10Mhz). I was wondering if anyone of you have ever
successfully tried in building the webserver at 4Mhz (or below?).
I was going to work on this project for my class assignment. I'm just a
beginner in embedded electronics application and I choose PIC to start
learning about this interesting field.
Thanks.

-lucky-

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2000\08\15@124351 by alphaone

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Not to discourage you, but you should be aware that an Ethernet based web
server on a PIC would require at minimum:

o Ethernet controller & interface components (hack a NIC or buy a chip)
o Memory for packet storage & processing (possibly in the PIC or Ethernet
controller)
o A PIC with suitable program storage and enough pins for Ethernet
controller
o Software on the PIC to implement ARP,ICMP,IP,TCP & HTTP protocols (see the
RFC's)

This is easily possible at 4MHz (1 MIPS on a PIC16F877). This too is a
project of mine, and I now have most of it completed, except for the final
touches on the TCP/HTTP program code. This is not by any means a robust
implementation, but it has worked up to now with a few limitations, mostly
packet size. I have made the hardware implementation available and I may do
the same with the software when finished. The code is presently under 1KB
with all of the above protocols plus UDP/IP and some discovery code so my
client software can find unconfigured units on the local Ethernet segment
and set their IP, etc. Adding DHCP eventually.

You will quickly find the 'F84 insufficient for this sort of endeavor.

There are other implementations that use the Crystal CS8900 Ethernet
controller, but even that requires more pins than the 'F84 has. If you can
find the Crystal chip, and if you want to pay for a circuit board (or make
one - be aware that it's a surface-mount device), then that is probably a
better way to go in the long run. My design is primarily hobby related and
engineered for fastest time to completion and lowest cost (used 3c509b's are
$3-4 vs. $12 for CS8900+board+descrete parts++++).

That which I have made available is here, updated from time to time:

       http://www.rof.net/yp/alphaone/activities/electronics/3c509b/

If you need more assistance, I'd be glad help. I'd suggest that you first
understand the nature of Ethernet data transmission and the full details of
each of the required protocols so you know what you're getting into before
proceeding with this specific project. It is possible, and one helluva
learning experience, but a lot of work as well.

JB

> {Original Message removed}

2000\08\15@135548 by Predrag Djordjevic

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Hi Lucky!

Look at http://www-ccs.cs.umass.edu/~shri/iPic.html
12c509 + eeprom in smd
There are (on net) other small webserver projects, but not so small!

Pedja

"spam_OUTluckyTakeThisOuTspamISRG.ITB.ac.id" wrote:
{Quote hidden}

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2000\08\15@145945 by Tim Hamel

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Pedja,

There's been way too much debate over whether this is a hoax or not (I think
it is). It's a load a crap. Look at his tech specs for it, he claims he can
implement I2C functionality in ONLY 3 instructions!

I looked at JB's page
(http://www.rof.net/yp/alphaone/activities/electronics/3c509b/) and this is
MUCH more to spec than false claims. Great site JB =)

There's another site that's along the lines of truth:

http://www.mycal.net/wsweb/design/

Regards,

Tim Hamel

In a message dated 8/15/00 10:56:23 AM Pacific Daylight Time,
.....peacelordKILLspamspam@spam@PTT.YU writes:

> Hi Lucky!
>
>  Look at http://www-ccs.cs.umass.edu/~shri/iPic.html
>  12c509 + eeprom in smd
>  There are (on net) other small webserver projects, but not so small!
>
>  Pedja
>

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2000\08\15@154321 by Andy Howard

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Another place to look is:

http://www.rmbeales.fsnet.co.uk/






----- Original Message -----
From: "Tim Hamel" <TekPhobiaspamKILLspamAOL.COM>

> Pedja,
>
> There's been way too much debate over whether this is a hoax or not (I
think
> it is). It's a load a crap. Look at his tech specs for it, he claims he
can
> implement I2C functionality in ONLY 3 instructions!
>
> I looked at JB's page
> (http://www.rof.net/yp/alphaone/activities/electronics/3c509b/) and this
is
{Quote hidden}

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2000\08\15@161006 by Bob Ammerman

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> > >  Look at http://www-ccs.cs.umass.edu/~shri/iPic.html
> > >  12c509 + eeprom in smd
> > >  There are (on net) other small webserver projects, but not so small!

> > There's been way too much debate over whether this is a hoax or not (I
> think
> > it is). It's a load a crap. Look at his tech specs for it, he claims he
> can
> > implement I2C functionality in ONLY 3 instructions!

I don't think that is the claim. I think that he is saying that his I2C/File
system/HTTP as a whole takes between 3 and 99 instructions. I assume the
lower limit is when the feature is omitted from the configuration.

I do find this rather amazing, and on the edge of what I might believe
possible.

I sure would like to see his source code!

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
sofftware)

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2000\08\15@170458 by Predrag Djordjevic
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Right. When I look better.

Tim Hamel wrote:
>
> Pedja,
>
> There's been way too much debate over whether this is a hoax or not (I think
> it is). It's a load a crap. Look at his tech specs for it, he claims he can
> implement I2C functionality in ONLY 3 instructions!

I could not find JB's page. Please check URL

>
> I looked at JB's page
> (http://www.rof.net/yp/alphaone/activities/electronics/3c509b/) and this is
> MUCH more to spec than false claims. Great site JB =)
>
> There's another site that's along the lines of truth:
>

I know this site, and a few others

> http://www.mycal.net/wsweb/design/
>
> Regards,
>
> Tim Hamel
>
> In a message dated 8/15/00 10:56:23 AM Pacific Daylight Time,
> EraseMEpeacelordspam_OUTspamTakeThisOuTPTT.YU writes:
>

I did not spend enough time on micro web servers, only download and put
on side when I will have more time.

Thank you Tim
Regards,

Pedja

{Quote hidden}

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