1-wire searchrom command
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Posts: 46,084
I've been experimenting with some 1-wire devices and have tried to
get
the searchrom command to work. The Dallas data sheet mentions that
the
command is used to find all devices on the bus and determine their
rom
code. I cannot find any program code examples in the stamp
documentation.
Any help would be appreciated as my attempts to get this command to
work have been unsuccessful.
Marylou
get
the searchrom command to work. The Dallas data sheet mentions that
the
command is used to find all devices on the bus and determine their
rom
code. I cannot find any program code examples in the stamp
documentation.
Any help would be appreciated as my attempts to get this command to
work have been unsuccessful.
Marylou
Comments
Using the SEARCHROM command isn't what as simple as it seems. There are
several good application notes from Dallas Semiconductor at www.iButton.com -
look under data sheets and application notes. The documentation that contains
everything you need to know about 1-wire devices and iButtons (which are
1-wire devices in a small can) is in the "Book of iButton Standards", which
you can download from the iButton web site.
Jon Williams, an application engineer for Parallax wrote a complete search
routine for the BS2P for an article in the April '01 edition of Nuts & Volts
magazine. The issue is still available for $5 from www.nutsvolts.com
There is also some examples for reading a single 1-wire device connected to
the 1-wire bus available on the Parallax web site. With just 1 device you
don't have to search, you can just issue a READ ROM command.
Tim
I forgot to mention that the source code for Jon's article in Nuts & volts
for the 1-wire search routine is available on the nuts & volts web site at:
http://www.nutsvolts.com/ftpindex.htm - look for April 2001 stamp0401code.zip
tim
In a message dated 1/1/02 7:13:53 PM, apstumpf@u... writes:
<< I've been experimenting with some 1-wire devices and have tried to
get
the searchrom command to work. The Dallas data sheet mentions that
the
command is used to find all devices on the bus and determine their
rom
code. I cannot find any program code examples in the stamp
documentation.
Any help would be appreciated as my attempts to get this command to
work have been unsuccessful.
Marylou >>
Thanks for the help. You're right, the search program is rather
complex. I'm using three 1822s and considered plugging in one
at a time to find the rom codes.
Marylou
_________________________
--- In basicstamps@y..., tbitson@a... wrote:
> Marylou,
>
> I forgot to mention that the source code for Jon's article in Nuts &
volts
> for the 1-wire search routine is available on the nuts & volts web
site at:
> http://www.nutsvolts.com/ftpindex.htm - look for April 2001
stamp0401code.zip
>
> tim
>
>
> In a message dated 1/1/02 7:13:53 PM, apstumpf@u... writes:
>
> << I've been experimenting with some 1-wire devices and have tried
to
> get
> the searchrom command to work. The Dallas data sheet mentions that
> the
> command is used to find all devices on the bus and determine their
> rom
> code. I cannot find any program code examples in the stamp
> documentation.
> Any help would be appreciated as my attempts to get this command to
> work have been unsuccessful.
>
> Marylou >>
apstumpf@u... writes:
> Tim,
> Thanks for the help. You're right, the search program is rather
> complex. I'm using three 1822s and considered plugging in one
> at a time to find the rom codes.
>
You should have seen it before I got it done! That code kept me up several
very late nights sorting through less-than-helpful information for Dallas
Semiconductor. I deliberately put the Search program in a separate slot so
that it could be used easily without understanding the gory details.
-- Jon Williams
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