Embedded System USB programming in C

Overview
Although the course will discuss the design and implementation of USB driver libraries, the emphasis will be on theory, troubleshooting and use of existing embedded system USB libraries and how to develop applications on top of these libraries. The course will cover both device and host implementation and USB On The Go (OTG). The application examples will be oriented towards embedded system applications development and will include examples such as RS232 to USB bridging, Ethernet to USB bridging, mass storage device and human interaction devices. The course will overview the implementation of device driver code running on PCs or workstations. [ Please inquire about FTT courses that cover USB device driver programming and application development on Microsoft Windows, and Unix/Linux systems. ] The course will demonstrate the use of USB protocol analysers and commercial tools for Windows USB Driver Development.

Key Skills
After attending this course, you will be able to:

• hardware and design aspects of USB enabled system development
• link layer and physical layer aspects of the USB protocol
• work with on chip and off chip USB peripherals
• design and implement USB enabled applications ranging from human interaction device applications and communications device applications through to audio and mass storage device applications
• understand how Windows and Linux USB device drivers are implemented
• understand the USB Bus Enumeration Sequence

Course Contents
Overview of the USB System Architecture

• History, rationale and development of the USB Standard
• USB software structure and organisation
• Key USB protocol concepts - transfer, transaction and packet
• Capturing and analysing a USB session trace
• USB device configuration
• Standard descriptors and commands

USB Electrical Specification

• Overview of cables and connectors
• USB signalling - low speed , full speed , high speed
• reset sequence
• chirp negotiation

Principles of the USB Transfer Protocol

• low speed / full speed transfer protocol
• periodic vs. non-periodic transfers in high speed systems
• error detection and recovery
• power management

Device Configuration and Device Classes

• device configuration and the device initialisation sequence
• overview of various device classes
• human interface
• mass storage
• communication devices - networks and modems
• chip/smart card interface
• audio
• still image capture
• test and measurement

USB on the go (OTG)

• Kinds of applications and background
• plugs and receptacles
• electrical standards
• session request protocol

Hub and Host Controller Operation

• Hub operation
• humb architecture
• hub class descriptors and commands
• Host controller operation
• OHCI, UHCI, EHCI
• intialisation
• port routing and control
• periodic scheduling, asynchronous scheduling
• queue heads and the management of bulk, control and interrupt transfers

Example Case Studies

• simple hid device - emulating a mouse with some buttons and a potentiometer
• simple data acquisition and logging device
• implementing an RS232 to USB bridge device
• implementation of a USB to Ethernet bridge device
• implementating a simple mass storage device using a SD-MMC flash memory card with a FAT16 file system

Windows and Linux USB Device Drivers

• Overview Windows driver frameworks for XP, Vista and WinCE systems
• Using Windows standard USB drivers - an overview
• Implementing application specific USB drivers under Windows - an overview
• Overview of the Linux 2.6 Kernel Device Driver Framework
• implementing Linux USB Driver applications