Hello
I recommend NOT building any master solutions. find a way
to make the slave device based on PIC or Scenix or ???
fast enough to work with standard masters. Then existing systems
will be able to accept programmable slaves without replacing masters.
Regards
AGSC
On Sep 29, 2005, at 8:41 AM, René Tegel wrote:
Hi,
A solution would be to create a DS2480 compatible device as master...
as said i got stuff working, but not 100% reliable. Could be because
i was using a breadboard (i hear some electrotechnicians yelling from
here). I am pretty sure a faster pic (8MHz+) would solve at least
some of the problems.
Attached the source i made by then - i cannot guaratuee this version
works (done lot of experimenting, not sure where i quit). Also
apologize me for not cleaning up source and especially the dutch
comments. If you think it is worth working on i might undust my
programmer and pick up the project again ;)
Some comments on the code. Initially i took a ID of a 1-wire device
that was connected to 1 i/o pin (the programm would be master, read
the ID and use that one). later on i wrote some routines that
generate a random unique ID with correct checksum, which was
generated and stored in flash at first startup.
I hope i find time to restructure this code and build an example of a
dallas compatible device.
For the list members, sourceforge mailing list manager refused the
small attached zip as i sent to Petr. You can download it from here
http://misc.dubaron.com/electronics/
regards,
rene
Petr wrote:
Rene,
thanks for your offer. I will appreciate if you can send your
sources to me.
Problems described before can be, IMHO, caused because 4 MHz frequency
of 12f675 is not fast enough to accomplish protocol standards
properly. We will try it with faster microprocessor :).
BTW I will prefer if such a "home-build slave" can be detected and
driven on the 1-wire network using OWFS, not by some "home-build"
master.
Regards
Petr
RT> Hi,
RT> think you have best changes if both slave and master are 'home-
build'..
RT> as said in my previous mail, i encountered problems using
dallas' master
RT> devices.
RT> if you want i can delve my archives and send you the source for
a custom
RT> slave, written for a 12f675 (if i remember correctly) in
assembler.
RT> regards,
RT> rene
RT> Petr wrote:
I have made some research during the weekend and it looks like there
is nearly no activity in "1-Wire slave" emulation on the Internet.
The only web I have found is in Poland (fortunately Polish is
similar
a little bit to the Czech language so I can understand it :)
http://idom.wizzard.one.pl
This guy is designing his own home automation using 1-Wire protocol.
Slave devices on the network are build using the atmel tiny13
microprocessor and the sources are available in the download
section.
We will do more investigation and experiments and I will send more
info about our progress (if any :) later on.
Petr
APHMD> Petr,
APHMD> APHMD> It would be nice to have an easily added facility
to extend OWFS for these
APHMD> "one-of" devices. APHMD> APHMD> I presume there would be
specific memory addresses with known format that would
APHMD> have a meaning (like 0x0122-3 are int16 "angle") and PIO.A
is "motor on"
APHMD> APHMD> Seems like a configuration file and parser would
work. I haven't done anything
APHMD> like that for years. Text? XML?
APHMD> APHMD> Once parsed, this process wold be vary fast, and
easy to intergrate into the
APHMD> current design. The only question is whether it should
include small "programs"
APHMD> like the process needed to get humidity or thermocouple
readings, which need
APHMD> several different properties read and set, in order.
APHMD> APHMD> Paul
APHMD> ________________________________
APHMD> From: [EMAIL PROTECTED] on
behalf of Petr
APHMD> Sent: Tue 9/27/2005 3:20 AM
APHMD> To: ND Holmes
APHMD> Cc: [EMAIL PROTECTED]
APHMD> Subject: [Owfs-developers] Re: Microchip acting as 1Wire
APHMD> Nathan,
APHMD> good to know somebody is as crazy as we are :)
APHMD> Our main intention was (is) to program Microchip to behave
(act)
APHMD> "exactly" as a one wire device (slave), so the master
(OWFS) can't
APHMD> find any difference and will detect and treat microchip
exactly as the
APHMD> real one 1-wire device. DS2431 (1024-Bit 1-Wire EEPROM) is
coming to
APHMD> mind as a good candidate.
APHMD> IMHO it can be possible to write commands (sense of
rotation of the
APHMD> motor, speed, number of steps, acceleration, etc...) to
the Microchip
APHMD> memory (acting as DS2431 EEPROM) through 1-wire network.
APHMD> Microchip (according to the received information) will
control motor
APHMD> and will write feedback information (the real position of
the motor for
APHMD> example) to an other part of the EEPROM so it will be
possible to read
APHMD> this information from the 1-wire network.
APHMD> I will appreciate your comments.
APHMD> Petr
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