linux-kernel - [SOLVED] Serial buffer corruption [was Re: FTDI usb-serial possible bug]

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Message-ID: <5486cca80705040233y70915a27yf7cbbc08a617e3ba@mail.gmail.com>
Date:	Fri, 4 May 2007 11:33:13 +0200
From:	"Antonino Ingargiola" <tritemio@...il.com>
To:	linux-usb-users@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [SOLVED] Serial buffer corruption [was Re: FTDI usb-serial possible bug]

Accidentally I've replied privately, sorry. Forwarding to ML...

---------- Forwarded message ----------
From: Antonino Ingargiola <tritemio@...il.com>
Date: May 4, 2007 11:29 AM
Subject: Re: [SOLVED] Serial buffer corruption [was Re: FTDI
usb-serial possible bug]
To: Oliver Neukum <oliver@...kum.org>


On 5/4/07, Oliver Neukum <oliver@...kum.org> wrote:
> Am Freitag, 4. Mai 2007 10:38 schrieb Antonino Ingargiola:
> > To solve the problem we must do a complete flush of all the buffer
> > chain. I do this flushing the input multiple times with a small pause
> > between them. In my case 10 flushes separated by a 10ms pause always
> > empties the whole buffer chain, so I get no corruption anymore. I'ts
> > not an elegant solution but it works (10 flushes are an overkill but I
> > want to be _really_ sure to read the correct data).
>
> How do you flush the buffers? Simply reading them out?

Nope. In python I use the flushInput() method of the serial object
defined by the pyserial library[0]. The method does just this system
call:

    termios.tcflush(self.fd, TERMIOS.TCIFLUSH)

that I think is correct.

Cheers,

  ~ Antonio

[0]: http://pyserial.sourceforge.net/ (or python-serial debian package)
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