LMX9830 Bluetooth™ Serial Port Module

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LMX983012.0 Command InterfaceThe LMX9830 offers Bluetooth functionality in either a selfcontained slave functionality or over a simple commandinterface. The interface is listening on the UART interface.The following sections describe the protocol transported onthe UART interface between the LMX9830 and the host incommand mode (see Figure 23). In Transparent mode, nodata framing is necessary and the device does not listenfor commands.12.1 FRAMINGThe connection is considered “Error free”. But for packetrecognition and synchronization, some framing is used.All packets sent in both directions are constructed per themodel shown in Table 25.12.1.1 Start and End DelimiterThe “STX” char is used as start delimiter: STX = 0x02. ETX= 0x03 is used as end delimiter.12.1.2 Packet Type IDThis byte identifies the type of packet. See Table 26 fordetails.12.1.3 OpcodeThe opcode identifies the command to execute. Theopcode values can be found within the “LMX9830 SoftwareUser’s Guide” included within the LMX9830 EvaluationBoard.12.1.4 Data LengthNumber of bytes in the Packet Data field. The maximumsize is defined with 333 data bytes per packet.12.1.5 Checksum:This is a simple Block Check Character (BCC) checksum ofthe bytes “Packet type”, “Opcode” and “Data Length”. TheBCC checksum is calculated as low byte of the sum of allbytes (e.g., if the sum of all bytes is 0x3724, the checksumis 0x24).LMX9830UARTUARTExisting devicewithout BluetoothcapabilitiesFigure 23. Bluetooth Functionality.StartDelimiterPacketType IDTable 25. Package FramingOpcode Data Length Checksum Packet Data EndDelimiter1 Byte 1 Byte 1 Byte 2 Bytes 1 Byte Bytes 1 Byte- - - - - - - - - - - - - Checksum - - - - - - - - - - - - -ID Direction DescriptionTable 26. Packet Type Identification0x52‘R’0x43‘C’0x69‘i’0x72‘r’REQUEST(REQ)Confirm(CFM)Indication(IND)Response(RES)A request sent to the Bluetooth module.All requests are answered by exactly one confirm.The Bluetooth modules confirm to a request.All requests are answered by exactly one confirm.Information sent from the Bluetooth module that is not a direct confirm to a request.Indicating status changes, incoming links, or unrequested events.An optional response to an indication.This is used to respond to some type of indication message.www.national.com 34
12.0 Command Interface (Continued)12.2 COMMAND SET OVERVIEWThe LMX9830 has a well defined command set to:■ Configure the device:– Hardware settings– Local Bluetooth parameters– Service database■ Set up and handle linksTables 27 through 37 show the actual command set andthe events coming back from the device. A full documenteddescription of the commands can be found in the“LMX9830 Software User’s Guide”.NOTE: For standard Bluetooth operation only commandsfrom Table 27 through Table 29 will be used. Most of theremaining commands are for configuration purposes only..LMX9830Table 27. Device DiscoveryCommand Event DescriptionInquiry Inquiry Complete Search for devicesDevice FoundLists BDADDR and class of deviceRemote Device Name Remote Device Name Confirm Get name of remote deviceTable 28. SDAP Client CommandsCommand Event DescriptionSDAP Connect SDAP Connect Confirm Create an SDP connection to remote deviceSDAP Disconnect SDAP Disconnect Confirm Disconnect an active SDAP linkConnection LostNotification for lost SDAP linkSDAP Service Browse Service Browse Confirm Get the services of the remote deviceSDAP Service Search SDAP Service Search Confirm Search a specific service on a remote deviceSDAP Attribute Request SDAP Attribute Request Confirm Searches for services with specific attributesTable 29. SPP Link EstablishmentCommand Event DescriptionEstablish SPP Link Establishing SPP Link Confirm Initiates link establishment to a remote deviceLink EstablishedLink successfully establishedIncoming LinkA remote device established a link to the localdeviceSet Link Timeout Set Link Timeout Confirm Confirms the Supervision Timeout for the existingLinkGet Link Timeout Get Link Timeout Confirm Get the Supervision Timeout for the existingLinkRelease SPP Link Release SPP Link Confirm Initiate release of SPP linkSPP Send Data SPP Send Data Confirm Send data to specific SPP portIncoming DataIncoming data from remote deviceTransparent Mode Transparent Mode Confirm Switch to Transparent mode on the UARTTable 30. Storing Default ConnectionsCommand Event DescriptionConnect Default Connection Connect Default Connection Confirm Connects to either one or all stored defaultconnectionsStore Default Connection Store Default Connection Confirm Store device as default connectionGet list of Default Connections List of Default DevicesDelete Default Connections Delete Default Connections Confirm35 www.national.com
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LMX9830 Bluetooth™ Serial Port Module

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