From: "Michael G. Katzmann" <michaelk@IEEE.org>
To: Johan Hovold <johan@kernel.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: Tue, 23 Feb 2021 09:58:47 -0500 [thread overview]
Message-ID: <780b9aa6-890d-47fd-d6b2-cd9a39f7634a@IEEE.org> (raw)
In-Reply-To: <YDPS3AP63/PwmwJU@hovoldconsulting.com>
On 2/22/21 10:50 AM, Johan Hovold wrote:
Well I found I have another Prolific device here that I got from Adafruit (https://www.adafruit.com/product/954)
It also has a Prolific 2303 and behaves exactly like the other one. i.e. with the current Linux driver it gives a very high baudrate when set to 110 bd and gives 110bd when the modifications are made to the driver that I found.
Is it that we are presuming that what Prolific is telling us is true and only Joe and I are actually measuring the data rate? (i.e. why does the Prolific Windows driver set the values as Joe found ???)
Adafruit device:
Bus 001 Device 013: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x067b Prolific Technology, Inc.
idProduct 0x2303 PL2303 Serial Port
bcdDevice 3.00
iManufacturer 1 Prolific Technology Inc.
iProduct 2 USB-Serial Controller
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0027
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x000a 1x 10 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
--
|\ _,,,---,,_ Michael Katzmann
/,`.-'`' -. ;-;;,_ NV3Z / VK2BEA / G4NYV
|,4- ) )-,_. ,\ ( `'-'
'---''(_/--' `-'\_) MichaelK@IEEE.org
next prev parent reply other threads:[~2021-02-23 15:00 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3aee5708-7961-f464-8c5f-6685d96920d6@IEEE.org>
[not found] ` <dc3458f1-830b-284b-3464-20124dc3900a@IEEE.org>
2021-02-22 8:52 ` non-standard baud rates with Prolific 2303 USB-serial 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
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 [this message]
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
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