Great idea!
On Fri, Mar 13, 2015 at 1:48 PM, Johan Ström <jo...@stromnet.se> wrote:
> 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> 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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>
>
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