On Tue, 7 Oct 2014, Emiliano Vazquez wrote:
El 06/10/14 a las 12:42, David Lang escibió:
what does 'lsusb -v -s 3:3' and -s 3:4 show on Ubuntu?
First you need to know this:
I have severals usb to serial adapters. All of those have the same HL-340
chipset.
when i plug two of this serials i get only information in Bus 003 Device 002
and Device 003. This give me a possibility to do lsub -v -s 3:2 and lsusb -v
3:3
Then i take out one device and put another and get Bus 003 Device 003 and
Device 004
If i take out both and replug then i will need lsusb -v -s 3:5 and lsusb -v
-s 3:6
It's like an incremental device ? I don't know.
Yep, each time you connect it, it shows as a new device, and if the system
hasn't completely timed out and disconnected the old device, it gets assigned a
new id (and since there is no message to the system when a device is
disconnected, this can be a very long timeout)
David, this is the output on Ubuntu
yep, nothing unique, so there is no reliable way to tell them apart.
If there is some way to alter the firmware on these devices to set a serial
number you could do it (see the current handwringing over "Bad USB" as an
example), but other than that you are going to have problems. I would suggest
looking for another brand of cheap adapter so that you can use one of each brand
so that you can tell them apart.
David Lang
lsusb -v -s 3:3
Bus 003 Device 003: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial
adapter
Couldn't open device, some information will be missing
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x1a86 QinHeng Electronics
idProduct 0x7523 HL-340 USB-Serial adapter
bcdDevice 2.54
iManufacturer 0
iProduct 2
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 96mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 1
bInterfaceProtocol 2
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 1
lsusb -v -s 3:2
Bus 003 Device 002: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial
adapter
Couldn't open device, some information will be missing
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x1a86 QinHeng Electronics
idProduct 0x7523 HL-340 USB-Serial adapter
bcdDevice 2.54
iManufacturer 0
iProduct 2
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 96mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 1
bInterfaceProtocol 2
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 1
this is only one difference: the line who talks about the Bus!
I would say that the openwrt serial shown by udevadm info is faulty, but I
suspect that the Ubuntu one is faulty as well, just in a different way.
It's true.
Best regards.
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