Re: Likely issue with ch341 kernel-module/driver

[Johan Hovold <johan@kernel.org>]

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