Windows® 2000 Device Driver Book: A Guide for Programmers, Second Edition, The

Chapter 8. Interrupt-Driven I/O

CHAPTER OBJECTIVES

• How Programmed I/O Works

• Driver Initialization and Cleanup

• Writing a Start I/O Routine

• Writing an Interrupt Service Routine (ISR)

• Writing a DpcForIsr Routine

• The Parallel Port

• Parallel Port Loopback Driver

• Testing the Parallel Port Loopback Driver

• Summary

Some devices transfer data through registers, requiring continual CPU interaction. Such devices usually move small amounts of data at relatively infrequent intervals. For example, the mouse and keyboard transfer just a few bytes sporadically. Such devices remain idle for minutes (or hours) at a time and so are given the ability to interrupt the processor whenever data is available. This chapter explains how to write the data transfer routines for ...