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> 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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