Professional Windows® Embedded Compact 7 by Samuel Phung & David Jones & Thierry Joubert

Author:Samuel Phung & David Jones & Thierry Joubert
Language: eng
Format: epub
Publisher: John Wiley & Sons
Published: 2011-08-05T16:00:00+00:00

What Then Is a Virtual Device Driver?

A virtual device driver has the top interface of the driver architecture without the hardware interface. That is, it plugs into the OS as a serial device, a keyboard, or other device without implementing the lower interface to hardware. It builds upon other device drivers. For example, a USB serial device driver at its top level interfaces to the OS as a serial device and encapsulates a USB hardware driver as its lower level transport. Another virtual serial device could use a network as its transport. As shown in Figure 30-4, a virtual device driver can implement the lower part of its functionality by calling back to the OS to invoke other drivers hosted by the OS.

FIGURE 30-4

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