Hi,
Paul Alfille:
> The new DS28EA00 is a temperature chip that has a special "chain" mode to
> tell location. Specifically there are in/out pins that tell which chip is
> connected to which.
>
Nice. Remind me to beat myself up because the wiring I've been using
definitely doesn't have a spare wire for that kind of feature. ;-)
> 1. have a directory entry "chain" that would have a list (comma separated)
> of the chained ID numbers
Why commas? I'd use newlines, they're much more convenient for
sequential reading from script languages as well as C.
> 3. Put the "chain" file under "simultaneous -- already a per-segment
> directory entry.
>
Makes sense.
> Any thoughts?
>
I'd definitely go with the third option.
As I understand the protocol, selectively enabling just one sensor in
order to figure out what the next one's address is is not possible.
Thus, you need multiple accesses to walk through the whole bus segment.
The individual device directories are for individual devices, and each
file access in there takes one bus access (usually). Putting their
relationship to other devices in that directory doesn't make sense,
neither from a conceptual nor a performance PoV.
--
Matthias Urlichs | {M:U} IT Design @ m-u-it.de | [EMAIL PROTECTED]
Disclaimer: The quote was selected randomly. Really. | http://smurf.noris.de
- -
The most utterly lost of all days, is that in which you have not once
laughed.
-- Chamfort
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