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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