About This Guide

This USB Software Development Kit is intended for developers who need to write USB client device drivers that will run under the QNX Neutrino or QNX 4 realtime operating systems.

Our USB API is designed to work with either QNX Neutrino or QNX 4. Exceptions will be noted where appropriate.

This guide is organized into these main parts:

• a read-this-first page indicating your system requirements and other vital information you should know before you begin
• an overview describing how the OS supports USB
• command-line utilities
• a set of function pages describing the USB driver interface calls

For general information about working with the DDK source code, see About Driver Development Kits. The USB SDK includes source code for several USB class drivers. Look under the /usr/src/ddk-6.2.0/usb/src/hardware/devu/class directory on your system.

Assumptions

We assume you're familiar with the Universal Serial Bus (USB) Specification revision 1.1, especially the chapters on:

• Architectural Overview
• USB Data Flow Model
• USB Device Framework
• USB Host: Hardware and Software.

You'll need a good understanding of the concepts in those chapters in order to write USB client device drivers.

For up-to-date information on USB developments, visit www.usb.org.