Writing Drivers for the QNX OS

A review of basic programming topics for the QNX OS, such as threads, mutexes, message passing, pulses and timing. This module provides a refresher course to students familiar with QNX programming and offers background for other course material.

This section provides a quick introduction to editing, compiling, running and debugging your application from the QNX® Momentics® IDE, giving you the minimum information necessary to do the exercises in the programming sections.

A look at the capabilities of resource managers, including pathname-space resolution, IPC message formats and general structure. We provide several exercises, from a very simple resource manager that implements /dev/null to more complex examples that support multiple devices.

Explores the various ways to return from handlers, manage access and modification times, leave clients blocked, use multi-threaded resource managers, implement combine messages, perform unblock handling, receive pulses and make select() and ionotify() work. Resource manager concepts are reinforced through a variety of hands-on exercises.

Covers in detail the I/O aspects of a driver, including how to do port I/O and memory-mapped I/O, how to perform DMA memory configuration and how to use the PCI API.

Explores how the QNX OS makes it relatively easy to write and debug interrupt handlers. We present several approaches to interrupt handlers.

A collection of challenging exercises that are a must for anyone learning to write device drivers. The exercises used depend on the hardware available. Choose:

• VGA Text Mode driver exercise: You'll write an I/O manager that does read()s from, write()s to and devctl()s for changing the configuration of VGA text mode memory.
• Keyboard driver exercise: You will write a simple driver that handles x86 keyboard input.

Instruction for writing file system resource managers which are processes that represent data in the form of files or file systems. You will learn to write a resource manager that presents a tar file as a file system.

We'll look at using the QNX OS io-char library to write a driver for character devices such as serial chipsets that support the RS-232 protocol.

In each section of the course, you will have an opportunity to put what you learn into practice. After learning each programming technique, you will apply it to situations that may arise in your own applications.