What is USB? - Software

• The host computer requires a USB stack for applications to communicate with devices.

• Every device is uniquely identified by Vendor and Product code.

• Vendor and Product codes are acquired from the USB implementers forum at not inconsiderable cost.

• The USB forum extended the basic USB software specification to include the idea of “classes” of devices.

• A device class includes all specific devices of a given type. The idea is that only one device driver is required for a whole set of devices.