USB Complete: Everything You Need to Develop USB ... - PIC Vietnam

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Introduction can help speed up the process, and options for obtaining drivers from other sources. Example code shows how to detect and communicate with devices in Visual Basic .NET and Visual C++ .NET applications. What firmware does my device need to support USB communications? Learn how to write device firmware that enables your device to respond to received requests and exchange other data on the bus. How do I decide whether my device can use bus power or needs its own supply? Many USB devices can be powered entirely from the bus. Find out whether your device can use bus power. Learn how to ensure that your device meets USB’s requirement to limit the use of bus current when the host computer suspends the bus. Can I connect other USB peripherals to my device? Find out how to use USB On-The-Go to enable your device to act as a limited-capability host that can access other USB peripherals. How can I ensure that my device will communicate without problems? At the device, writing bugfree firmware requires understanding what your device must do to meet the requirements of the USB specifications. At the host computer, Windows must have the information needed to identify the device and locate a driver to communicate with the device. This book has tips, example code, and information about debugging software and hardware to help with these tasks. To understand the material in the book, it’s helpful to have basic knowledge in a few areas. I assume you have some experience with digital logic, application programming for PCs and writing embedded code for peripherals. You don’t have to know anything at all about USB. What’s New in the Third Edition? Since the publication of USB Complete Second Edition, much has happened in the world of USB. Additions to the USB specifications include many updated and expanded device-class specifications and the USB On-The-Go supplement. Many new device-controller chips have been released. New tools for debugging and compliance testing are available. Support for USB USB Complete xvii
Introduction device classes under Windows has improved. And Microsoft’s .NET Framework has become a popular platform for developing host applications. These developments prompted me to write USB Complete Third Edition. The material is revised and updated from start to finish to reflect these and other developments related to USB hardware and programming. More Information, Updates, and Corrections To find out more about developing USB devices and the software that communicates with them, I invite you to visit my USB Central page at Lakeview Research’s Web site (www.Lvr.com). You’ll find code examples and links to articles, products, tools, and other information related to developing USB devices. If you have a suggestion, code, or other information that you’d like me to post or link to, let me know at jan@Lvr.com. Corrections and updates will also be available at www.Lvr.com. If you find an error, please let me know and I’ll post it. Acknowledgements USB is too big a topic to write about without help. I have many people to thank. I owe a big thanks to my technical reviewers, who provided feedback that has greatly improved the book. (With that said, every error in this book is mine and mine alone.) Thanks first to Paul E. Berg, MCCI Vice President, Architecture and USB-IF Device Working Group Chair. Thanks also to David Goll of the USB-IF’s Video Device Working Group, Lucio DiJasio and Rawin Rojvanit of Microchip Technology, John Hyde of usb-by-example.com, Geert Knapen of the USB-IF’s Audio Device Working Group, Walter Oney of Walter Oney Software, and Marc Reinig of System Solutions. xviii USB Complete
Page 2 and 3: USB Complete Everything You Need to
Page 4 and 5: Introduction xv Contents 1. USB Bas
Page 6 and 7: Interrupt Transfers 72 Availability
Page 8 and 9: Controllers that Interface to Exter
Page 10 and 11: Obtaining a Handle 303 Requesting a
Page 12 and 13: Performance Tips 426 Speed Consider
Page 14 and 15: Wireless Links 530 Cypress Wireless
Page 16 and 17: Introduction Introduction This book
Page 20 and 21: Introduction Others I want to thank
Page 22 and 23: USB Basics USB Basics 1 What if you
Page 24 and 25: Table 1-1: Comparison of popular co
Page 26 and 27: USB Basics power supply. In contras
Page 28 and 29: USB Basics large and small blocks o
Page 30 and 31: USB Basics are complete microcontro
Page 32 and 33: USB Basics Broadcasting. USB provid
Page 34 and 35: USB Basics you may be able to use o
Page 36 and 37: USB 2.0 USB Basics In this book, th
Page 38 and 39: USB Basics common peripherals such
Page 40 and 41: USB Basics multiple hubs in series,
Page 42 and 43: USB Basics data-acquisition unit. A
Page 44 and 45: TEAM FLY USB Basics Just about any
Page 46 and 47: USB Basics may support only low-pow
Page 48 and 49: USB Basics bus. While in the Suspen
Page 50 and 51: USB Basics Because the bus is share
Page 52 and 53: USB Basics Initial Decisions Before
Page 54 and 55: Inside USB Transfers Inside USB Tra
Page 56 and 57: Inside USB Transfers Figure 2-1: At
Page 58 and 59: Inside USB Transfers host with no 1
Page 60 and 61: Inside USB Transfers point addresse
Page 62 and 63: Inside USB Transfers Table 2-1: Eac
Page 64 and 65: Inside USB Transfers All Other Tran
Page 66 and 67: Inside USB Transfers phases. Data s
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Inside USB Transfers Table 2-3: The
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Inside USB Transfers full-speed dev
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Inside USB Transfers only thing a h
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Inside USB Transfers Table 2-4: The
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Inside USB Transfers A 2.0 hub may
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Inside USB Transfers how the CRC is
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Inside USB Transfers have two or th
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A Transfer Type for Every Purpose A
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A Transfer Type for Every Purpose F
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A Transfer Type for Every Purpose s
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A Transfer Type for Every Purpose t
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Availability Structure Data Size A
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TEAM FLY Speed A Transfer Type for
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A Transfer Type for Every Purpose O
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A Transfer Type for Every Purpose A
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A Transfer Type for Every Purpose t
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Data Size Speed A Transfer Type for
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A Transfer Type for Every Purpose c
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A Transfer Type for Every Purpose i
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Enumeration: How the Host Learns ab
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Device_qualifier Descriptor Enumera
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Control Transfers: Structured Reque
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TEAM FLY Control Transfers: Structu
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Sent by: the host. Control Transfer
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Get_Status Control Transfers: Struc
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Set_Feature Control Transfers: Stru
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Get_Descriptor Control Transfers: S
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Get_Configuration Control Transfers
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Get_Interface Control Transfers: St
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Synch_Frame Control Transfers: Stru
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Chip Choices Chip Choices 6 When yo
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The USB Controller Chip Choices A t
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Chip Choices uration register may e
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Chip Choices are available both wit
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Device Requirements Chip Choices In
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Driver Choices Chip Choices The oth
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Chip Choices Figure 6-1: The USB I2
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Chip Choices Table 6-1: USB control
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Chip Choices transaction. The addre
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Chip Choices Table 6-2: Cypress Sem
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Table 6-3: An EZ-USB can run firmwa
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Cypress enCoRe II Chip Choices The
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Controllers that Interface to Exter
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TEAM FLY Chip Choices ware. Some mi
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Chip Choices hardware reset, the ch
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Chip Choices Architecture Both chip
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Table 6-6: Pinout of the FT232BM US
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Figure 6-2: For easy prototyping wi
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Device Classes Device Classes 7 Thi
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Device Classes Table 7-1: These cla
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Defined Classes Audio Device Classe
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Device Classes Figure 7-2: An Audio
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Device Classes bytes, and can provi
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Device Classes Table 7-3: The speci
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Device Classes Windows Support Unde
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Class-specific Requests There are t
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Device Classes Figure 7-5: A commun
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Device Classes Table 7-4: In the in
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Device Classes Table 7-6: A Functio
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Device Classes CSM-2 is DTCP, which
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Device Classes device is upgrading
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Human Interface Device Classes The
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Device Classes host sends a Get_Des
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Device Classes A USB IrDA bridge us
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Device Classes Each media type has
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Device Classes Table 7-8: The CSW c
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Printers Device Classes ATA/ATAPI d
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TEAM FLY Class-specific Requests Th
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Device Classes passes it on to Usbm
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Class-specific Requests There are f
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Device Classes the response, follow
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Device Classes information about in
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Device Classes Figure 7-8: A VideoS
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Device Classes the class’s requir
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Device Classes When using a USB/RS-
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Using a Generic Driver Device Class
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How the Host Communicates How the H
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Options for USB Devices How the Hos
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How the Host Communicates In kernel
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How the Host Communicates Figure 8-
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How the Host Communicates Perhaps b
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Communication Flow How the Host Com
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How the Host Communicates CyUsb.sys
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How the Host Communicates to a USB
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How the Host Communicates For faste
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How the Host Communicates Table 8-1
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Matching a Driver to a Device Match
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Matching a Driver to a Device Figur
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Matching a Driver to a Device Devic
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Matching a Driver to a Device a dev
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Matching a Driver to a Device Table
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TEAM FLY Figure 9-7: The service ke
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[Install.AddReg] HKR,,DevLoader,,*n
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Matching a Driver to a Device [Vers
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Matching a Driver to a Device Desti
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Matching a Driver to a Device which
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Matching a Driver to a Device [LAKE
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Matching a Driver to a Device Table
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Matching a Driver to a Device The I
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Matching a Driver to a Device renam
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Detecting Devices Detecting Devices
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Detecting Devices To use data retur
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Detecting Devices contains a stub f
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Detecting Devices application, the
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Detecting Devices ByRef and ByVal I
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Detecting Devices The DEVICE_NOTIFY
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Visual Basic The function has no re
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Detecting Devices ment contains a h
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This is the function’s declaratio
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This is the code to call the functi
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Detecting Devices next call. But be
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Visual Basic This is the function
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This is the function’s declaratio
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Detecting Devices cate, notify the
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Detecting Devices DeviceNotificatio
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TEAM FLY Detecting Devices When fin
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This is the code for the OnDeviceCh
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Detecting Devices The application c
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Detecting Devices Dim DeviceNameStr
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Human Interface Devices: Using Cont
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Get_Idle Human Interface Devices: U
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Set_Report Human Interface Devices:
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Human Interface Devices: Reports Hu
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Human Interface Devices: Reports Fi
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Human Interface Devices: Reports Th
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Human Interface Devices: Reports Ta
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TEAM FLY Human Interface Devices: R
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Human Interface Devices: Reports an
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0x15 0x00 // Logical Minimum 0x26 0
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Human Interface Devices: Reports As
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Physical Descriptors Human Interfac
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Human Interface Devices: Host Appli
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This is the declaration for the fun
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This is the code for doing an overl
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TEAM FLY Bulk Transfers for Any CPU
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Bulk Transfers for Any CPU Figure 1
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' Registers that relate to serial c
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Bulk Transfers for Any CPU ' Disabl
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Bulk Transfers for Any CPU ' If rea
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process_received_data: return Bulk
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Bulk Transfers for Any CPU Table 14
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Bulk Transfers for Any CPU Table 14
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Bulk Transfers for Any CPU a byte.
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Bulk Transfers for Any CPU The ’2
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FT2232C extensions Bulk Transfers f
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Hubs: the Link between Devices and
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Speed Hubs: the Link between Device
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Port Indicators Hubs: the Link betw
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TEAM FLY Managing Power Managing Po
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Managing Power hub’s connector. I
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Managing Power A high-power device
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Hub Power Managing Power Powering o
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Managing Power Figure 16-3: When a
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Ω μ Managing Power Figure 16-4: T
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Power Management under Windows Mana
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Managing Power work-arounds under W
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Tools Testing and Debugging 17 Test
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Testing and Debugging via USB or an
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Testing and Debugging Figure 17-3:
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Testing and Debugging requests alon
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Testing and Debugging The Chapter 9
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Testing and Debugging must meet add
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Signals and Encoding Signals and En
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Signals and Encoding defined by whe
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Signals and Encoding High-speed Dat
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Signals and Encoding Figure 18-1: I
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Signals and Encoding Bit stuffing c
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Signals and Encoding High speed’s
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Signals and Encoding Frame Number T
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TEAM FLY Purpose. Test the high out
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The Electrical Interface 19 The Ele
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The Electrical Interface Figure 19-
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The Electrical Interface The Circui
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The Electrical Interface alternativ
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The Electrical Interface handle all
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The Electrical Interface more than
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The Electrical Interface GND is the
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The Electrical Interface the height
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The Electrical Interface The USB sp
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Balanced Lines The Electrical Inter
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The Electrical Interface A low-spee
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The Electrical Interface A Wireless
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The Electrical Interface With both
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Dual-role Devices with USB On-The-G
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The OTG Descriptor Dual-role Device
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Index TEAM FLY Page numbers in ital
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Freescale MCF5482 ColdFire, 164 Mic
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WirelessUSB, 530-1, 532, 533 D D2XX
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tools for testing and debugging, 47
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GUIDs (Globally Unique Identifiers)
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support as necessary element for US
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Logical Maximum item, 362, 364-5 Lo
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vs. USB, 3 PCs. See also host compu
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RS-232 interface converters for, 11
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transceivers full-speed, 508-12, 51
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using Windows API functions in appl
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