linux-kernel - Re: Likely issue with ch341 kernel-module/driver

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Message-ID: <CAHP4M8XrAH7nefdOWE2JfWh0GZMwvA_FSz=E+PCW52zwqFj8LA@mail.gmail.com>
Date:	Thu, 27 Aug 2015 13:57:01 +0530
From:	Ajay Garg <ajaygargnsit@...il.com>
To:	Johan Hovold <johan@...nel.org>
Cc:	Peter Stuge <peter@...ge.se>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: Likely issue with ch341 kernel-module/driver

Hi John.

On Thu, Aug 27, 2015 at 1:07 PM, Johan Hovold <johan@...nel.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.

Thanks everyone for the quick replies so far, I am grateful.


Thanks and Regards,
Ajay
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