Hi,
I haven't decided whether this is a good or terrible idea, so I'm just
throwing it out there. If I know that a given 1-wire device serial
number is on a given bus, can we use that for mapping things
consistently. I am in particular thinking that some masters and switches
have serial numbers and are not going to move around in a given setup.
jerry
On 10/06/2014 04:14 PM, Paul Alfille wrote:
Hi Michael,
There are two possible uses for the usb<->tty mapping.
1. Discovery -- find a unique USB device (HobbyBoards, Eclo, etc) and
then find the tty port to use.
2. Tune a FTDI device when the /dev/tty port is passed to owfs.
You're right, of course. Probing an anonymous serial device is unsafe.
Paul
On Mon, Oct 6, 2014 at 6:13 PM, Michael Markstaller <m...@elabnet.de
<mailto:m...@elabnet.de>> wrote:
Hi Paul,
this is very interesting (one has 3x FTDI with 2-4 ports and 7x
PL2303)
and so I installed it straight away on several boxes.
I suffer from this problem, that the kernel (or BIOS or whoever..)
assigns different Bus/Device-IDs (and therefore tty) to the same
device
depending on:
- cold(power-cycle) or a "warm" reboot
- order of connection
- Moon or Sun-Phase, I never found out :p
My last conclusion was: only a device with a unique
serial/name/description (like with FTxx) could be matched by a program
(or udev-rule) to get one&the same /dev/xxx-Entry over all cases.
It's even worse: Users change hubs, ports, ...
The same might be sad but true for owfs & ttyUSBx, I wouldn't rely
on that.
That being said, I'll test; but my guess is: enumerate the device your
looking for by other means, not bus/dev-id..
Michael
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