From: Oliver Neukum <oneukum-IBi9RG/b67k@public.gmane.org>
To: Stuart Longland
<stuartl-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org>,
Johan Hovold <johan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Alan Cox
<gnomes-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>,
linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Moxa UPort 1150 and RS-422/485… what's the "proper" way to switch modes
Date: Tue, 27 Jun 2017 14:08:51 +0200 [thread overview]
Message-ID: <1498565331.30390.5.camel@suse.com> (raw)
In-Reply-To: <42601356-656d-57d0-d366-a0933780b8f9-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org>
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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next prev parent reply other threads:[~2017-06-27 12:08 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4a469222-d48d-f498-f2db-ca582295adc3@longlandclan.id.au>
[not found] ` <4a469222-d48d-f498-f2db-ca582295adc3-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org>
2017-06-27 9:04 ` Moxa UPort 1150 and RS-422/485… what's the "proper" way to switch modes Johan Hovold
2017-06-27 9:43 ` Stuart Longland
[not found] ` <42601356-656d-57d0-d366-a0933780b8f9-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org>
2017-06-27 12:08 ` Oliver Neukum [this message]
[not found] ` <1498565331.30390.5.camel-IBi9RG/b67k@public.gmane.org>
2017-06-27 22:07 ` Stuart Longland
[not found] ` <ae2907c2-cb0f-61e4-c6f2-af3dcec93ace-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org>
2017-06-28 9:19 ` Oliver Neukum
[not found] ` <1498641549.10278.5.camel-IBi9RG/b67k@public.gmane.org>
2017-06-28 12:01 ` Greg KH
[not found] ` <20170628120120.GA10502-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-06-28 12:41 ` Oliver Neukum
[not found] ` <1498653709.10278.17.camel-IBi9RG/b67k@public.gmane.org>
2017-06-28 14:59 ` Bjørn Mork
2017-06-28 15:35 ` Johan Hovold
2017-06-28 15:34 ` Johan Hovold
2017-06-29 19:50 ` Alan Cox
2017-07-03 8:51 ` Johan Hovold
2017-06-28 15:16 ` Johan Hovold
2017-08-18 2:56 ` [PATCH] USB: serial: ti_usb_3410_5052: Port uart_mode from io_ti Stuart Longland
[not found] ` <20170818025659.4402-1-stuartl-EoQOJlg3kTYQrrorzV6ljw@public.gmane.org>
2017-08-18 3:16 ` Stuart Longland
2017-08-19 20:40 ` Maksim Salau
[not found] ` <20170819234056.37c7d339-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-08-19 20:47 ` Stuart Longland
2017-08-28 8:56 ` Greg KH
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