HP Visualize c360 PA-RISC Visualize Workstation Universal Serial Bus - Page 25

USB Developer Considerations

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USB Developer Considerations • The HP-UX DDK has not yet been updated for USB. If you know how to write a WSIO driver, you are qualified to write a USB Class driver. A "CDDK" (Class Driver Developer's Kit) is under investigation. • Many non-HID devices so far introduced for Windows PCs are using the VendorSpecific Class (not an encouraging development, compared to iMac, where devices by and large are using standard Classes). Getting documentation on V-S command sets is often difficult or impossible. • Caution: the current National Super I/O chip used for the built-in USB does not support isochronous USB protocol. If your device can't be operated correctly using USB bulk or USB interrupt I/O, you'll need to rely on a PCI-USB card to support isochronous. • Not all audio devices require isochronous, but many of them feature multiple devices, often of the HID Class (knobs, buttons, etc.).

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USB Developer Considerations
•
The HP-UX DDK has not yet been updated for USB. If you know how to write a
WSIO driver, you are qualified to write a USB Class driver. A “CDDK” (Class
Driver Developer’s Kit) is under investigation.
•
Many non-HID devices so far introduced for Windows PCs are using the Vendor-
Specific Class (not an encouraging development, compared to iMac, where
devices by and large are using standard Classes). Getting documentation on V-S
command sets is often difficult or impossible.
•
Caution: the current National Super I/O chip used for the built-in USB does not
support isochronous USB protocol. If your device can’t be operated correctly
using USB bulk or USB interrupt I/O, you’ll need to rely on a PCI-USB card to
support isochronous.
•
Not all audio devices require isochronous, but many of them feature multiple
devices, often of the HID Class (knobs, buttons, etc.).