Programmatically determine USB type

Hi all,
This is likely one of those really obvious things that I've somehow just missed, but I was wondering if anyone knew of a way to programmatically determine whether a device I'm communicating with is using USB 1.0 or 2.0? I'm working on a VISA driver for an USB instrument that returns a data set in a completely different format depending on what kind of USB port it is plugged into. The instrument itself automatically determine which format it will use - and there doesn't appear to be any obvious status/data type indicator I can read off the instrument. I could pull the data in and analyze it to determine the format, but that seems clumsy. It would be much better if I could just detect the type and parse the data based on the type...
Any help at all would be appreciated!
Thanks,
Jason

I'm currently doing some programming with the FTDI chipset of USB devices. The FT_GetDeviceInfoList query contains information regarding the speed. The D2XX_Programmer's Guide descriptions lists:
The flag value is a 4-byte bit map containing miscellaneous data as defined Appendix A – Type Definitions. Bit 0 (least significant bit) of this number indicates if the port is open (1) or closed (0). Bit 1 indicates if the device is enumerated as a high-speed USB device (2) or a full-speed USB device (0). The remaining bits (2 - 31) are reserved.
I also believe the information is stored in the EEPROM (again, depending upon the chip). There is a BCD field that is either 0x0110 or 0x0200 depending upon the speed.
Jason
Jason

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Attachments:
ModSequentialModel.seq ‏42 KB

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