Re: Likely issue with ch341 kernel-module/driver

From	Johan Hovold <johan@kernel.org>
Newsgroups	linux.kernel
Subject	Re: Likely issue with ch341 kernel-module/driver
Date	2015-08-27 11:50 +0200
Message-ID	<q21YJ-Gn-3@gated-at.bofh.it> (permalink)
References	(2 earlier) <q1Nj4-4Uz-5@gated-at.bofh.it> <q1NsK-55Y-25@gated-at.bofh.it> <q1Zay-524-9@gated-at.bofh.it> <q1ZWV-6e9-5@gated-at.bofh.it> <q20Jk-7q5-17@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Aug 27, 2015 at 01:57:01PM +0530, Ajay Garg wrote:
> Hi John.
> 
> On Thu, Aug 27, 2015 at 1:07 PM, Johan Hovold <johan@kernel.org> wrote:
> >
> > Try to see if you can get the device to work reliably with some other
> > driver (vendor driver or other OS) to rule out a broken device.
> >
> 
> I tested the serial-usb adapter using a loopback-hardware-tool
> (confirmed to be perfect).
>
> Using this, I see what I type, echo it back, and see what I receive.
> 
> The putty session-settings are standard one - 9600, 8N-1, no parity.
> 
> The byte flow is
> putty-on-laptop => usb-interface => serial-interface => loopback =>
> serial-interface => usb-interface => putty-on-laptop.
>
> Thereafter, following are the echo-sequences I see ::
> 
> a ==> 0
> b ==> '
> c ==> N
> 
> This (I guess) confirms a problem on (at least) the driver-side.

Not unless you confirm that the same setup works when using a different
driver, right? Otherwise, it could still be a hw issue.

Johan
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Thread

Likely issue with ch341 kernel-module/driver Ajay Garg <ajaygargnsit@gmail.com> - 2015-08-26 18:10 +0200
  Re: Likely issue with ch341 kernel-module/driver Johan Hovold <johan@kernel.org> - 2015-08-26 19:10 +0200
    Re: Likely issue with ch341 kernel-module/driver Peter Stuge <peter@stuge.se> - 2015-08-26 20:10 +0200
      Re: Likely issue with ch341 kernel-module/driver Johan Hovold <johan@kernel.org> - 2015-08-26 20:20 +0200
        Re: Likely issue with ch341 kernel-module/driver Ajay Garg <ajaygargnsit@gmail.com> - 2015-08-27 08:50 +0200
          Re: Likely issue with ch341 kernel-module/driver Johan Hovold <johan@kernel.org> - 2015-08-27 09:40 +0200
            Re: Likely issue with ch341 kernel-module/driver Ajay Garg <ajaygargnsit@gmail.com> - 2015-08-27 10:30 +0200
              Re: Likely issue with ch341 kernel-module/driver Johan Hovold <johan@kernel.org> - 2015-08-27 11:50 +0200
            Re: Likely issue with ch341 kernel-module/driver Peter Stuge <peter@stuge.se> - 2015-08-27 14:10 +0200

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