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Cypress CY4672 manual WirelessUSB Protocol, General Overview, Radio Channel Management

Models: CY4672

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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 **

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

Contents

CY4672 Reference Design Guide Disclaimer CopyrightsContents 2.1 2.3 Programmable Interval Timer User Module 2.42.2 4.19.2 9.19.3 6.16 2.4 1 Millisecond Interval Timer User Module 2.56.17 6.181.2 1.11.3 100107 105108 109Scope IntroductionChapter Overviews SupportDefinitions ConventionsAcronyms Rssi Introduction General Overview WirelessUSB ProtocolRadio Channel Management Pseudo Noise CodesAutomatic Acknowledgment AutoACK Chip Error CorrectionNetwork ID Manufacturing IDChannel Selection Algorithm Protocol ModesIdle Mode Ping Mode Bridge OnlyBind Mode Reconnect KISSBind ModeReconnect 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 PABind/KISSBind Request Packet HID Packet StructuresConnect Request HID Bind Response Packet BridgeConnect Response Packet Bridge Device TypeData 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 ByteEncryption TEA Key Management over WirelessUSBTEA Encryption TEA Encryption Key Management AES EncryptionAES Key Management Encryption and Power Consumption Trade OffWirelessUSB Protocol RDK Mouse Assembly Design FeaturesMouse IntroductionBottom View Bind Button and On-Off Switch Schematics Hardware Block DiagramFirmware Architecture PRoC LP Device ConfigurationHardware Considerations 1 ROM/RAM UsageCYRF69103 Device Architecture SPI Master User Module Global ConfigurationModel Programmable Interval Timer User ModuleFlash Security Generated Library Code Common CodeDebounce Module SPI ModuleRadio Driver Timer ModuleProtocol Module Flash ModuleISR Module Application CodeMouse Module Testmode Module Optical ModuleMfgtest Module Buttons ModuleWheel Module Battery Module Configuration OptionsMOUSE800NOT400CPI PlatformhMfgtestcode MfgtxmodesPlatform and Architecture Portability Wireless Protocol Data PayloadInitialization KissbindPacket Format Interrupt usage and timing9.2 Packet Format ByteCode Performance Analysis Development EnvironmentTools Tips and Tricks Watchdog TimerCritical Test Points 2.1 M8C SleepKeyboard Keyboard Plastic RDK Keyboard AssemblyRadio and PSoC Board PDC-9265 Bind Button SchematicRow Keyboard MatrixTotal 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 KeyboardkeepalivetimeoutEncrypttea TimercalEncryptaes Mouseemulationmode Keyboard Application Report Formats 0xFC Byte NameModifier Reserved Scan Code Keys 0x00 0x04 Modifier Reserved Scan Code Keys 0x00Application Report Power Key Scan Interrupt Usage / Timing Ghost Key DetectionCode 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 workRDK Keyboard with POD Installed 10. RDK Keyboard Test Points Bridge In-System Programming Bridge PhotographsRDK Bridge with USB Adapter and PSoC MiniProg Schematics LED UsageBuild Option ROM Usage Bytes RAM Usage Bytes Total ROM Bytes Total RAM BytesCYRF69213 Device Architecture This parameter is set to 4.44 4.53 This parameter is set to 1HzUSB Device User Module 2.4 1 Millisecond Interval Timer User ModuleModules consist of the common code logical grouping PSoC Generated Library CodeFlash TimerMaster Protocol Bridge ModuleUSB Module Mfgtestcode Dalenable PowerbindInterrupt Usage/Timing Suspend and Remote WakeupPolling method is used for the Bind button Parameter Icc UnitsUSB Descriptors USB InterfaceKeyboard HID Report Descriptor Device/Config DescriptorsKeyboard HID Report Descriptor Endpoint Mouse/Keyboard HID Report DescriptorBridge Keyboard power keys use Report ID Keyboard Report Format Reserved Standard Key Keyboard Endpoint EP1Mouse Report Format Wheel Battery Level and Link Quality ReportsMouse Endpoint EP2 Report ID Unused Usage ID Usage NameObtaining the RadioParams Report Requesting a New Battery Reading17. Example keyboard Catc Trace Standard and MM Keys Example USB Bus Analyzer Catc Traces18. Example Mouse Catc Trace Key Up 19. Example Keyboard Catc Trace Power KeyFew of ways for working with the kit are the following Development and Debug EnvironmentManufacturing 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 PortingManufacturing Test Support, MTK Test Parameter FCC Limit Measured Value Margin Regulatory Testing ResultsRegulatory Testing Results Operation Mode Icc mA with Average Icc Supply Voltage = Power ConsiderationsRDK Keyboard Usage ModelMode 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 MethodsCCySysTray Class Methods System Tray ModuleCCySysTray Methods CWirelessUSBTrayApp Class Methods WirelessUSB System Tray Application ModuleCMainFrame Class Methods OnStopTimer Public This method stops the timer OnTimerCWirelessUSBStatusPropertySheet Class Methods CWirelessUSBStatusPropertyPage Class MethodsCHidTrayManager Class Methods CHidTrayDevice Class MethodsAppendix A. References + Feedback Numerics IndexLED Pseudo noise codes 13, 14 PSoC Designer generated files Index Revision History + Feedback