Freescale USB Device Stack
Users Guide
Document Number:USBUG
Rev. 12
05/2012
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Document Number: USBUG
Rev. 12
05/2012
USB Users Guide, Rev. 12
Freescale Semiconductor iii
Revision history
To provide the most up-to-date information, the revision of our documents on the World Wide Web will be
the most current. Your printed copy may be an earlier revision. To verify you have the latest information
available, refer to:
http://www.freescale.com
The following revision history table summarizes changes contained in this document.
Revision
Number
Revision
Date
Description of Changes
Rev. 1 05/2009 Alpha Customer Release.
Rev. 2 05/2009 Added CDC feature description.
Rev. 3 06/2009
• Added ColdFire V1 support and PHDC Multi-Specialization Device Demo
application.
• Changed USB to Serial Demo name to Virtual Communication (COM)
Demo.
Rev. 4 09/2009 Launch release. Customized for Medical Applications.
Rev. 5 10/2009 Added SD Card demo application.
Rev. 6 04/2010
Updated USB Stack installation and uninstallation and Medical Applications
USB Stack directory structure diagram to add support for S08MM128,
S08JE128, MCF51MM256, and MCF51JE256 devices.
Rev. 7 06/2010
• Added support for CFV2 devices.
• Rebranded Medical Applications USB Stack to Freescale USB Stack with
PHDC.
Rev. 8 09/2010
• Added support for CodeWarrior 10
• Added USB audio demo application
• Fig 2-1:Freescale USB stack with PHDC Directory Structure updated
Rev. 9 01/2011
• Added USB DFU demo application
• Update images in various demo application
• Minor editorial changes
Rev. 10 07/2011
• Added battery charging demo application
• USB FATFS User Guide incorporated in the USB User Guide
Rev. 11 03/2012
• Deleted chapters “FAT File System” and “AppendixJ_FATFS_Demo_Test”
• Replaced the term "Freescale USB Stack with PHDC" with "Freescale USB
Stack"
• Updated Installer screenshots
• Editorial Changes
USB Users Guide, Rev. 12
iv Freescale Semiconductor
Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc.
© Freescale Semiconductor, Inc., 2010–2012. All rights reserved.
Rev. 12 05/2012
Added
• Appendix J: Video Device Class Demo Applications
• Appendix K: MSD and CDC Composite Demo
• Appendix L: HID Audio Video Composite Demo
Revision
Number
Revision
Date
Description of Changes
USB Users Guide, Rev. 12
Freescale Semiconductor v
Chapter 1
Before You Begin
1.1 About Freescale USB Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.2 About this book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.3 Reference material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.4 Acronyms and abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.5 Important terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Chapter 2
Getting Familiar
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2 Software suite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.3 Directory structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Chapter 3
Freescale USB Stack Architecture
3.1 Architecture overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.2 Software flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
3.2.1 Initialization flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
3.2.2 De-initialization flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2.3 Transmission flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2.4 Reception flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Chapter 4
Developing New Class Drivers
4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.2 Steps for developing new class drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.2.1 Directory structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.2.2 Class initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.3 Class callback routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.2.4 Class request routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.2.4.1 Endpoint service routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Chapter 5
Developing Applications
5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.2 Application interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.3 Developing an Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.4 Application design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
5.4.1 Main Application Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
5.4.2 Callback Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
