Indeed, one is read only and one is write only. The reasoning behind two
separate nodes is that the actual commands to the Link is either "Set
high", "Set low", or "Put in Hi-Z mode and read". That is, reading means
any previous output will be invalidated as it will no longer "supply" a
high/low level.
How about auxctrl and auxsense, to avoid mixup with other "power"
entries (which indicates powered or parasite)?
On 3/13/15 17:17 , Paul Alfille wrote:
I love the idea, but not the names. In seems that one is read-only and
one write-only from the name.
How about auxpower and auxsense?
On Thu, Mar 12, 2015 at 12:37 PM, Johan Ström <jo...@stromnet.se
<mailto:jo...@stromnet.se>> wrote:
Oops, early send... Trying again, this time writing the full mail!
The LINK adapter has an extra AUX line which can be used as a
general I/O port (somewhat limited though).
Some background, from LinkUSB manual page:
---
The LinkUSBTM supports the standard RJ45 type 1-Wire bus
connection wherein the center two contacts of the RJ connector are
the data and ground connections to the 1- Wire bus. However,
another pin in the RJ connector is also brought into play. This
line is, by default, driven to the high impedance state and left
un-powered. It can be an output supplying a low level (0 VDC) or a
high level (5 VDC), or it can be an input sensing a 0- 5VDC logic
level. When set to the 5V level by the “d” command, this line can
be used to provide power for DS2409 and DS2406/7 type 1-Wire
switches. However, the current available from this output is
limited. The amount of current that the Aux line can provide is
limited to approximately 75 mA. ASCII commands used by the host
can cause the Auxiliary I/O pin to change its behavior as needed.
--
The other Link devices have the same, somewhat different details
though, mainly with regards to power levels.
I've added some code to control this line via owfs, commited in
branch link-aux:
https://sourceforge.net/p/owfs/code/ci/fca93b164f8b5f0fd0f97bb66d0be7081c751384/
It basically adds two new points in the filesystem:
/bus.N/interface/settings/ link/auxin
/bus.N/interface/settings/link/auxout
This is visible for Link devices only. Auxin allows putting the
AUX pin in hi-z mode, and reading the current value. auxout puts
the pin in high or low mode.
Is this a good solution? It isn't really a "setting", but it
belongs under /bus.0/interface.
Also, I didn't put auxin/out on the same node, since sending the
"read aux" command will actually put it in Hi-z mode rather than
just read it.
Reading from auxout is not doable right now, it would only be able
to reply the latest written value, which may or may not be
correct, so I skipped support for reading.
Let me know how if you think this fits in with the rest of OWFS,
or if it should be solved differently.
Regards
Johan
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