Re: hidapi: does not retrieve serial number of device on macos x

[Ludovic R. <lud...@gm...>]

2013/4/17 folkert <fo...@va...>:
> Hi,

Hello,

> I'm working on porting ClewareControl (for usb devices by
> www.cleware.de) to MacOS X.
> This clewarecontrol includes a commandline utility to configure/set/read
> those devices and development libraries for C++, Python and Perl.
> http://www.vanheusden.com/clewarecontrol/
> I don't have acces to a mac myself unfortuantely so I have to ask others
> to test for me.
>
> I ported clewarecontrol to hidapi and all runs fine on linux.
> On macos x, though, it doesn't show the serial number. This is rather
> essential as it is needed to distinguish what device to control when you
> have multiple connected.
> The hidtest program included in hidapi doesn't show the serial either:
>
>>>>>>     Device Found
>>>>>>       type: 0d50 0008
>>>>>>       path: USB_0d50_0008_0x100110a50
>>>>>>       serial_number:
>>>>>>       Manufacturer: Cleware GmbH
>>>>>>       Product:      USB-Ampel
>>>>>>       Release:      1d
>>>>>>       Interface:    -1
>
> The serial number ought to be 900705 (decimal) or DBE61 (hex).
> lsusb -vvv looks like:
>
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               1.10
>   bDeviceClass            0 (Defined at Interface level)
>   bDeviceSubClass         0
>   bDeviceProtocol         0
>   bMaxPacketSize0         8
>   idVendor           0x0d50 Cleware GmbH
>   idProduct          0x0008
>   bcdDevice            0.19
>   iManufacturer           1 Cleware GmbH
>   iProduct                2 USB-Ampel
>   iSerial                 3 00023D9      <--- note: this is the device I have at home, not the DBE61 one on the mac version
>   bNumConfigurations      1
>   Configuration Descriptor:
>     bLength                 9
>     bDescriptorType         2
>     wTotalLength           34
>     bNumInterfaces          1
>     bConfigurationValue     1
>     iConfiguration          0
>     bmAttributes         0x80
>       (Bus Powered)
>     MaxPower              440mA
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        0
>       bAlternateSetting       0
>       bNumEndpoints           1
>       bInterfaceClass         3 Human Interface Device
>       bInterfaceSubClass      0 No Subclass
>       bInterfaceProtocol      0 None
>       iInterface              0
>         HID Device Descriptor:
>           bLength                 9
>           bDescriptorType        33
>           bcdHID               1.00
>           bCountryCode            0 Not supported
>           bNumDescriptors         1
>           bDescriptorType        34 Report
>           wDescriptorLength      48
>          Report Descriptors:
>            ** UNAVAILABLE **
>       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              50
> Device Status:     0x0000
>   (Bus Powered)
>
> Using libusb it does get the serial number but then retrieving
> measurements doesn't work as it is an HID device.

I do not have many HID devices with a serial number.

On my Mac I have:
$ ./hidtest
Device Found
  type: 0000 0000
  path:
  serial_number:
  Manufacturer:
  Product:      Apple Mikey HID Driver

Device Found
  type: 05ac 8242
  path: USB_05ac_8242_0x10010d4b0
  serial_number:
  Manufacturer: Apple Computer, Inc.
  Product:      Apple IR

Device Found
  type: 05ac 023a
  path: Bluetooth_05ac_023a_0x10010bb60
  serial_number: 90-84-0d-e5-7e-45
  Manufacturer: Apple
  Product:      Clavier de Ludovic Rousseau

Device Found
  type: 05ac 030d
  path: Bluetooth_05ac_030d_0x10010c500
  serial_number: d4-9a-20-85-68-bd
  Manufacturer: Apple
  Product:      Souris de Ludovic Rousseau

As you can see the mouse and keyboard have a serial number. They are
bluetooth, not USB.

I will try later using another HID device but I do have it here. Maybe
Alan Ott has an explanation for the problem.

You can also get the USB tree, including the serial numbers, with the
"System Information" application in /Applications/Utilities/

Bye

--
 Dr. Ludovic Rousseau