Am Dienstag, den 27.06.2017, 19:43 +1000 schrieb Stuart Longland:
> Maybe a good start would be a "standard" option (referring to the
> physical signalling standard, TTL/RS-232/RS-422/RS-485), that lists the
> available standards when read and shows the "selected" standard in
> brackets (like the 'trigger' option of the LEDs sysfs interface)… so for
> this case:
>
> # cat /sys/class/tty/ttyUSB0/standard
> [rs232] rs422 rs485 rs485fd
>
> and to select 4-wire ("full duplex") RS-485, one does:
> # echo rs485fd > /sys/class/tty/ttyUSB0/standard
This looks like something that people will put into udev.
So the switch will be done via udev, but the user not necessarily
started via udev. Looks like a race to me.
And what do you if the interface is already opened and the sysfs
interface is used?
Regards
Oliver
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