All of lore.kernel.org
 help / color / mirror / Atom feed
From: Johan Hovold <johan@kernel.org>
To: "Michael G. Katzmann" <michaelk@IEEE.org>
Cc: charles-yeh@prolific.com.tw, linux-serial@vger.kernel.org,
	linux-usb@vger.kernel.org, Charles Yeh <charlesyeh522@gmail.com>,
	Joe Abbott <jabbott@rollanet.org>
Subject: Re: non-standard baud rates with Prolific 2303 USB-serial
Date: Mon, 22 Feb 2021 16:34:20 +0100	[thread overview]
Message-ID: <YDPO/JprcDTaPmR4@hovoldconsulting.com> (raw)
In-Reply-To: <fb1489c2-b972-619b-b7ce-4ae8e1d2cc0f@IEEE.org>

On Mon, Feb 22, 2021 at 09:53:39AM -0500, Michael G. Katzmann wrote:
> On 2/22/21 8:18 AM, Johan Hovold wrote:
> 
> I tried hardcoding buf[6-0] in pl2303_set_termios as
> 
> a8 a6 01 80 00 02 07 and got a bitrate of ~200kb 
> 
> so, no these settings do not work in my case (or I missunderstood your
> instructions 8-))

Thanks for testing (and that was with 0xa8 in byte 0, right?)

So it seems we have three devices with bcdDevice 0x0300 encoding the
divisors in slightly different ways and that are all still supported by
the vendor's Windows driver.

Unless Prolific are willing to shed some light on this, I guess someone
needs to try to figure out how the Windows driver determines which
encoding to use.

Is your device supposedly also a PL2303 TA? Could you post the output of
lsusb -v for completeness?

Johan

  parent reply	other threads:[~2021-02-22 15:35 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-21 15:37 non-standard baud rates with Prolific 2303 USB-serial Michael G. Katzmann
2021-02-22  2:15 ` Michael G. Katzmann
2021-02-22  8:52   ` Johan Hovold
2021-02-22 12:39     ` Michael G. Katzmann
2021-02-22 13:18       ` Johan Hovold
     [not found]         ` <fb1489c2-b972-619b-b7ce-4ae8e1d2cc0f@IEEE.org>
2021-02-22 15:34           ` Johan Hovold [this message]
2021-02-22 15:42             ` Michael G. Katzmann
2021-02-22 15:50               ` Johan Hovold
2021-02-22 16:37                 ` Michael G. Katzmann
2021-02-22 16:48                   ` Johan Hovold
2021-02-24 23:08                     ` Joe Abbott
2021-02-25  8:44                       ` Johan Hovold
     [not found]                   ` <43da22ced8e14442bbc8babea77e4ed7@MailHC2.prolific.com.tw>
2021-02-23 10:18                     ` Johan Hovold
2021-02-23 13:25                     ` Michael G. Katzmann
2021-02-23 14:58                 ` Michael G. Katzmann
2021-02-23 15:43                   ` Johan Hovold
2021-02-23 15:57                     ` Michael G. Katzmann
2021-02-23 16:14                       ` Johan Hovold
2021-02-23 16:30                         ` Michael G. Katzmann
2021-02-23 16:52                           ` Johan Hovold
2021-02-23 19:15                             ` Michael G. Katzmann
2021-02-24 17:04                               ` Johan Hovold
2021-02-24 18:13                                 ` Michael G. Katzmann
2021-02-25  8:42                                   ` Johan Hovold
2021-04-08 15:35                                     ` Johan Hovold
2021-02-24  7:34                             ` Charles Yeh
2021-02-24 17:00                               ` Johan Hovold
2021-02-24 17:12                                 ` Michael G. Katzmann
2021-03-05  9:32                                 ` Charles Yeh
2021-03-05  9:36                                   ` Johan Hovold
2021-03-06 20:18                                     ` Michael G. Katzmann
2021-03-07  4:15                                     ` Michael G. Katzmann
2021-03-11 16:08                                       ` Johan Hovold
2021-03-12 13:17                                         ` Michael G. Katzmann
2021-03-12 13:44                                           ` Johan Hovold
2021-03-12 20:29                                             ` Michael G. Katzmann
2021-03-13  1:28                                             ` Michael G. Katzmann
2021-03-15  9:07                                               ` Johan Hovold
2021-03-15 10:07                                                 ` Charles Yeh
2021-03-15 10:24                                                   ` Johan Hovold
2021-02-22  3:57 ` Grant Edwards

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=YDPO/JprcDTaPmR4@hovoldconsulting.com \
    --to=johan@kernel.org \
    --cc=charles-yeh@prolific.com.tw \
    --cc=charlesyeh522@gmail.com \
    --cc=jabbott@rollanet.org \
    --cc=linux-serial@vger.kernel.org \
    --cc=linux-usb@vger.kernel.org \
    --cc=michaelk@IEEE.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.