Re: Strange errors with NI GPIB-USB-HS

Hi Jakub,
The suspicious entry is:
      bEndpointAddress 0x81 EP 1 IN
        bmAttributes 3
          Transfer Type Interrupt
          Synch Type None
          Usage Type Data
        wMaxPacketSize 0x0010 1x 16 bytes
        bInterval 0
A genuine card sets the poll interval for the interrupt endpoint to 2 ms:
bInterval 2
We have seen this before a couple of times.
For the fake cards in the syslog you would see a message from the USB core
similar to this:
usb 2-1.1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid
bInterval 0, changing to 7
We have not figured out how the adapter is initialised in windows. For that
a trace of the initialisation with usbmon would be required. As you are
running windows in qemu this should be relatively easy to do,
cheers,
-Dave

On Wed, 3 Aug 2022 at 09:13, Jakub Ladman <[email protected]> wrote:

> > Hi Jakub,
> > One way to check is to look at: the output of the syslog lines with
> "gpib" in them and the output of "lsusb -d 3923:",  with the adapter
> plugged in.
> > cheers,
> > -dave
>
>
> Hello
>
> First of all, I wrote that the device is working with windows, but the
> part I omitted is - windows is running in qemu on the same machine,
> where I'm testing the linux-gpib.
>
> I can't show you the syslog output, because I have now installed the
> closed source driver and appropriate software from National Instruments
> (which I don't want to use in the end, but I use it now as a sanity
> check only).
>
> The lsusb output is:
> $ lsusb -d 3923: -v
>
> Bus 001 Device 020: ID 3923:709b National Instruments Corp. GPIB-USB-HS
> Couldn't open device, some information will be missing
> Device Descriptor:
>    bLength 18
>    bDescriptorType 1
>    bcdUSB 2.00
>    bDeviceClass 0
>    bDeviceSubClass 0
>    bDeviceProtocol 0
>    bMaxPacketSize0 64
>    idVendor 0x3923 National Instruments Corp.
>    idProduct 0x709b GPIB-USB-HS
>    bcdDevice 1.01
>    iManufacturer 1 National Instruments
>    iProduct 2 GPIB-USB-HS
>    iSerial 3 019BF124
>    bNumConfigurations 1
>    Configuration Descriptor:
>      bLength 9
>      bDescriptorType 2
>      wTotalLength 0x0035
>      bNumInterfaces 1
>      bConfigurationValue 1
>      iConfiguration 0
>      bmAttributes 0x80
>        (Bus Powered)
>      MaxPower 500mA
>      Interface Descriptor:
>        bLength 9
>        bDescriptorType 4
>        bInterfaceNumber 0
>        bAlternateSetting 0
>        bNumEndpoints 5
>        bInterfaceClass 255 Vendor Specific Class
>        bInterfaceSubClass 0
>        bInterfaceProtocol 0
>        iInterface 0
>        Endpoint Descriptor:
>          bLength 7
>          bDescriptorType 5
>          bEndpointAddress 0x02 EP 2 OUT
>          bmAttributes 2
>            Transfer Type Bulk
>            Synch Type None
>            Usage Type Data
>          wMaxPacketSize 0x0200 1x 512 bytes
>          bInterval 0
>        Endpoint Descriptor:
>          bLength 7
>          bDescriptorType 5
>          bEndpointAddress 0x06 EP 6 OUT
>          bmAttributes 2
>            Transfer Type Bulk
>            Synch Type None
>            Usage Type Data
>          wMaxPacketSize 0x0200 1x 512 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 0x0010 1x 16 bytes
>          bInterval 0
>        Endpoint Descriptor:
>          bLength 7
>          bDescriptorType 5
>          bEndpointAddress 0x84 EP 4 IN
>          bmAttributes 2
>            Transfer Type Bulk
>            Synch Type None
>            Usage Type Data
>          wMaxPacketSize 0x0200 1x 512 bytes
>          bInterval 0
>        Endpoint Descriptor:
>          bLength 7
>          bDescriptorType 5
>          bEndpointAddress 0x88 EP 8 IN
>          bmAttributes 2
>            Transfer Type Bulk
>            Synch Type None
>            Usage Type Data
>          wMaxPacketSize 0x0200 1x 512 bytes
>          bInterval 0
>
> If you see something strange here, please let me know.
>
> Thank you.
>
> Jakub Ladman
>
>
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