WirelessUSB Protocol, General Overview | Cypress CY4672 specs

2.WirelessUSB™ Protocol 2.2

2.1General Overview

The WirelessUSB™ protocol 2.2 is designed to address 2-way Human Interface Devices (HID) as well as general purpose devices; it provides reliable 2-way communication between a wireless device configured as 1:1 (one HID and one bridge) or 2:1 (two HIDs and one bridge) systems. The WirelessUSB protocol 2.2 allows HID applications to establish a connection to the bridge and receive ACK and DATA packets from the bridge.

Figure 2-1. WirelessUSB 2-Way System

Host PC

or Laptop

USB

WirelessUSB-LS

Bridge

(Transceiver)

WirelessUSB-

Keyboard

(Transceiver)

WirelessUSB

Mouse

(Transceiver)

2.1.1Radio Channel Management

WirelessUSB uses the unlicensed 2.4 GHz Industrial, Scientific, and Medical (ISM) band for wireless connectivity. WirelessUSB uses 78 of the available channels and splits the 78 channels into 6 chan- nel subsets consisting of 13 channels each. The channel subsets are used by each network to mini- mize the probability of interference from other WirelessUSB systems (see the Channel Selection Algorithm on page 15 section for more details). A designated channel subset is used during bind mode (along with an associated pseudo noise code) in order to enable all WirelessUSB devices to effectively communicate during this procedure.

2.1.2Pseudo Noise Codes

Pseudo noise codes (PN codes) are the codes used to achieve the special matched filter character- istics of direct sequence spread spectrum (DSSS) communication. Certain codes referred to as ‘mul- tiplicative codes’ are used for WirelessUSB 2-way communication. These codes have minimal cross- correlation properties, meaning they are less susceptible to interference caused by overlapping transmissions on the same channel. The length of the PN code results in different communication characteristics. Higher data rates are achieved with 32-chips/bit PN codes, while 64-chips/bit PN codes allow a longer range. The number of frequency/code pairs is large enough to comfortably

CY4672 Reference Design Guide, Document # 001-16968 Revision **

13

[+] Feedback

Image 13

Cypress CY4672 manual WirelessUSB Protocol, General Overview, Radio Channel Management, Pseudo Noise Codes

Contents

CY4672 Reference Design Guide Disclaimer Copyrights Contents 2.1 2.3 Programmable Interval Timer User Module 2.42.2 4.1 9.2 9.19.3 6.16 2.4 1 Millisecond Interval Timer User Module 2.56.17 6.18 1.2 1.11.3 100 107 105108 109 Scope IntroductionChapter Overviews Support Definitions ConventionsAcronyms Rssi Introduction General Overview WirelessUSB ProtocolRadio Channel Management Pseudo Noise Codes Automatic Acknowledgment AutoACK Chip Error CorrectionNetwork ID Manufacturing ID Channel Selection Algorithm Protocol Modes Idle Mode Ping Mode Bridge OnlyBind Mode Reconnect KISSBind Mode Reconnect Mode HID only Idle Mode HID onlyButton Bind Mode Enhanced KISSBind Slave Unbind Data ModeBack Channel Data Support Back Channel Transaction Sequence Dynamic Data Rate Dynamic Data Rate and Dynamic PA Bind/KISSBind Request Packet HID Packet Structures Connect Request HID Bind Response Packet BridgeConnect Response Packet Bridge Device Type Data Packet/Back Channel Data Packet Bridge and HID Ping Packet BridgeData Byte 0-N This is byte-aligned application data Bind and Reconnect Timing Bind Timing Diagram Device Signature Byte Encryption TEA Key Management over WirelessUSBTEA Encryption TEA Encryption Key Management AES Encryption AES Key Management Encryption and Power Consumption Trade Off WirelessUSB Protocol RDK Mouse Assembly Design FeaturesMouse Introduction Bottom View Bind Button and On-Off Switch Schematics Hardware Block Diagram Firmware Architecture PRoC LP Device ConfigurationHardware Considerations 1 ROM/RAM Usage CYRF69103 Device Architecture SPI Master User Module Global Configuration Model Programmable Interval Timer User ModuleFlash Security Generated Library Code Common CodeDebounce Module SPI Module Radio Driver Timer ModuleProtocol Module Flash Module ISR Module Application CodeMouse Module Testmode Module Optical Module Mfgtest Module Buttons ModuleWheel Module Battery Module Configuration Options MOUSE800NOT400CPI PlatformhMfgtestcode Mfgtxmodes Platform and Architecture Portability Wireless Protocol Data PayloadInitialization Kissbind Packet Format Interrupt usage and timing9.2 Packet Format Byte Code Performance Analysis Development EnvironmentTools Tips and Tricks Watchdog TimerCritical Test Points 2.1 M8C Sleep Keyboard Keyboard Plastic RDK Keyboard Assembly Radio and PSoC Board PDC-9265 Bind Button Schematic Row Keyboard Matrix Total ROM Total RAM Bytes EnCoRe II Device ConfigurationBuild Option ROM Usage RAM Usage Bytes Microcontroller Device Architecture This parameter is set to Disable This parameter is set to EnableThis parameter is set to Tcap This parameter is set to ‘1’ Reset Isr TimerApplication Keyboard Module Test Module Encrypt Module Keyboardkeepalivetimeout Encrypttea TimercalEncryptaes Mouseemulationmode Keyboard Application Report Formats 0xFC Byte NameModifier Reserved Scan Code Keys 0x00 0x04 Modifier Reserved Scan Code Keys 0x00 Application Report Power Key Scan Interrupt Usage / Timing Ghost Key Detection Code Performance Analysis Modifying the Keyboard Matrix Modifying the Keyboard Matrix or Adding New KeysAdding New Keys Build the firmware, the new key ‘My Computer’ will work RDK Keyboard with POD Installed 10. RDK Keyboard Test Points Bridge In-System Programming Bridge Photographs RDK Bridge with USB Adapter and PSoC MiniProg Schematics LED Usage Build Option ROM Usage Bytes RAM Usage Bytes Total ROM Bytes Total RAM Bytes CYRF69213 Device Architecture This parameter is set to 4.44 4.53 This parameter is set to 1Hz USB Device User Module 2.4 1 Millisecond Interval Timer User Module Modules consist of the common code logical grouping PSoC Generated Library Code Flash TimerMaster Protocol Bridge Module USB Module Mfgtestcode Dalenable Powerbind Interrupt Usage/Timing Suspend and Remote WakeupPolling method is used for the Bind button Parameter Icc Units USB Descriptors USB Interface Keyboard HID Report Descriptor Device/Config Descriptors Keyboard HID Report Descriptor Endpoint Mouse/Keyboard HID Report Descriptor Bridge Keyboard power keys use Report ID Keyboard Report Format Reserved Standard Key Keyboard Endpoint EP1 Mouse Report Format Wheel Battery Level and Link Quality ReportsMouse Endpoint EP2 Report ID Unused Usage ID Usage Name Obtaining the RadioParams Report Requesting a New Battery Reading 17. Example keyboard Catc Trace Standard and MM Keys Example USB Bus Analyzer Catc Traces 18. Example Mouse Catc Trace Key Up 19. Example Keyboard Catc Trace Power Key Few of ways for working with the kit are the following Development and Debug Environment Manufacturing Test Support, MTK MTK Block DiagramMTK Serial Protocol Command Command Description Serial Command ProtocolSerial Response Protocol Serial Port Parameter Settings Accessing MTK in the DUTMTK RF Protocol MTK DUT Source Code Porting Manufacturing Test Support, MTK Test Parameter FCC Limit Measured Value Margin Regulatory Testing Results Regulatory Testing Results Operation Mode Icc mA with Average Icc Supply Voltage = Power ConsiderationsRDK Keyboard Usage Model Mode Hrs/day Days Average Icc mA Charge mAh Battery Life CalculationsRDK Mouse Active mode-Move the mouse in a circle on white Paper Power Considerations Software Code Modules Software GuideUSB HID API module CHidDeviceClass Methods CHidDevice Class MethodsMethod Type Description CHidManagerClass Methods CHidManager Class Methods CCySysTray Class Methods System Tray ModuleCCySysTray Methods CWirelessUSBTrayApp Class Methods WirelessUSB System Tray Application Module CMainFrame Class Methods OnStopTimer Public This method stops the timer OnTimer CWirelessUSBStatusPropertySheet Class Methods CWirelessUSBStatusPropertyPage Class Methods CHidTrayManager Class Methods CHidTrayDevice Class Methods Appendix A. References + Feedback Numerics Index LED Pseudo noise codes 13, 14 PSoC Designer generated files Index Revision History + Feedback