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文件名称：USB Multi-Role Device Design By Example
文件大小：3.29MB
文件格式：PDF
更新时间：2013-08-23 13:00:43
usb
Original USB Design Intent....................................................................................... 1
Host Role Responsibilities........................................................................................ 3
Ease of Use .............................................................................................................. 5
Dual Role Device Implementation ............................................................................ 6
Transforming into a host ........................................................................................... 8
Chapter Summary .................................................................................................. 11
Chapter 2: Getting to know EZ-Host and EZ-OTG .................................................... 13
Hardware features .................................................................................................. 13
Central Processing Unit .......................................................................................... 14
Memory Expansion Capability................................................................................ 15
Additional EZ-Host Capability................................................................................. 15
Integrated Timers ................................................................................................... 16
Power Management ............................................................................................... 16
USB Capabilities..................................................................................................... 17
Parallel IO............................................................................................................... 18
Serial IO.................................................................................................................. 19
IO Summary ........................................................................................................... 19
Firmware Features ................................................................................................. 21
BIOS Operation ...................................................................................................... 22
BIOS Memory Management ................................................................................... 23
BIOS Idle Task ....................................................................................................... 25
BIOS Scan Operation ............................................................................................. 26
Other BIOS functions.............................................................................................. 28
Chapter Summary .................................................................................................. 28
Chapter 3: EZ-Host/EZ-OTG Development Environment ......................................... 29
CY16 Firmware Architecture .................................................................................. 31
Frameworks Subsystem......................................................................................... 33
Simple Example #1 - Hello World........................................................................... 33
Target System ........................................................................................................ 34
Simple Example #2 – Using Scan Records............................................................ 38
Simple Example #3 – Buttons and Lights Device .................................................. 39
Simple Example #4 – BAL Host Program .............................................................. 44
Simple Example #5 – Standalone BAL Device ...................................................... 46
Chapter Summary .................................................................................................. 46
Chapter 4: Developing a host application ................................................................. 47
Key Host Controller Concepts ................................................................................ 47
Frameworks Host Controller Implementation......................................................... 50
Device Identification ............................................................................................... 55
Simple Example #6 – Buttons and Lights Host ...................................................... 56
vi
Chapter Summary...................................................................................................60
Chapter 5: Concurrent operation as a host and device.............................................61
Simple Example #7 – Concurrent BAL Host and Device........................................63
Simple Example #8 – Using Scan Records 2 .........................................................69
Smart USB Devices ................................................................................................71
Data Acquisition Example .......................................................................................73
Video Black Box Example.......................................................................................76
Chapter Summary...................................................................................................77
Chapter 6: Designing a dual-role device ...................................................................79
New dual-role concepts ..........................................................................................80
Simple Example #9 - Dual-role Buttons and Lights Device ....................................80
Simple Example #10 – Standalone Dual-role Buttons and Lights Device..............89
OTG behind-the-scenes..........................................................................................92
Session Request Protocol.......................................................................................95
Chapter Summary...................................................................................................97
Chapter 7: Using EZ-Host/EZ-OTG in coprocessor mode as a USB host controller 99
USB Host Controller Driver ...................................................................................104
Low-level Communications Driver ........................................................................106
Link Control Protocol.............................................................................................107
Root hub functionality............................................................................................108
Testing our host controller ....................................................................................108
Chapter Summary.................................................................................................111