DVK-BT740-SC datasheet, PDF - EEWORLD Datasheet

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DVK-BT740-SC: DescriptionDEV KIT FOR BT740 V2.1 U.FL; CategoryDevelopment board/suite/development tools; File Size2MB，155 Pages; ManufacturerLaird Technologies; Environmental Compliance

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DVK-BT740-SC Overview

DEV KIT FOR BT740 V2.1 U.FL

DVK-BT740-SC Parametric

Parameter Name	Attribute value
type	Transceiver; Classic Bluetooth®
frequency	2.4GHz
Supporting products/related products	BT740-SC
What's included	board, cable

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Enhanced Class 1

Bluetooth v2.1 Module

IRMWARE

SER

’

UIDE

ERSION

1.3

Part # BT740-SA, BT740-SC

Americas: +1-800-492-2320 Option 2

Europe: +44-1628-858-940

Hong Kong: +852-2923-0610

www.lairdtech.com/bluetooth

Enhanced Class 1 Bluetooth v2.1 Module

Firmware User’s Guide

ABLE OF

ONTENTS

Revision History ............................................................................................................................................... 2

Table of Contents ........................................................................................................................................... 3

AT Command Set ..................................................................................................................................... 4

S Registers .............................................................................................................................................. 24

Multipoint Protocol ................................................................................................................................ 39

Module Events........................................................................................................................................ 95

HDP Profile Related Events .................................................................................................................... 102

Debug Events ....................................................................................................................................... 103

Data Channels ...................................................................................................................................... 105

Multipoint Application Examples .......................................................................................................... 109

AT Application Examples ...................................................................................................................... 124

10.1

10.2

10.3

AT Commands............................................................................................................................ 149

S Registers .................................................................................................................................. 150

Error Responses .......................................................................................................................... 153

10 Appendices .......................................................................................................................................... 149

Embedded Wireless Solutions Support Center:

http://ews-support.lairdtech.com

www.lairdtech.com/bluetooth

Americas: +1-800-492-2320

Europe: +44-1628-858-940

Hong Kong: +852 2923 0610

Enhanced Class 1 Bluetooth v2.1 Module

Firmware User’s Guide

1 AT C

OMMAND

1.1 Introduction to AT Commands

This chapter describes the ‘AT’ protocol used to control and configure the BT740-Sx Bluetooth modules after

it is configured to present an ‘AT’ protocol instead of the alternate multipoint packet-based interface. The

Multipoint Protocol

is also described in this document.

The protocol is similar to the industry standard Hayes AT protocol used in telephony modems, as both types

of devices are connection oriented. The extended AT command set makes the Laird device performs the three

core actions of a Bluetooth device: establish Bluetooth connections, pair, and inquire. Many other provided

AT commands perform ancillary functions, such as trusted device database management and S Register

maintenance.

Just like telephony modems, the Laird device powers up in an unconnected state and only responds via the

serial interface. In this state the Laird device can respond to Bluetooth Inquiries. Then, just like controlling a

modem, the host issues AT commands which map to various Bluetooth activities. These AT commands have

appropriate counterparts in the alternate multipoint packet based protocol which also achieve the same goal.

The nature of ‘AT’ protocol allows it to control and manage only one connection at a time; this is in contrast

to the multipoint packet protocol which can simultaneously control many connections. The main advantage

‘AT’ protocol offers is simplicity.

The module has a serial interface through which the ‘AT’ protocol is channeled, which can be configured for

baud rates from 1200 up to 921600 and has an RF communications end point. The default baud rate for AT

command mode modules is 9600 bps.

The RF communications endpoint has a concept of connected and unconnected modes and the ‘AT’ protocol

at the serial interface has a concept of command and data modes. This leads to the matrix of states shown

below.

Command Mode

Data Mode

RF Unconnected

Allowed

Illegal

RF Connected

Allowed

The combination ‘Data + RF Unconnected Mode’ does not make sense and is ignored.

Navigation between these states uses the AT command/responses, described in detail in subsequent sections.

There are many references to the term ‘S Register’ in the rest of this document. These are an array of integer

values stored in non-volatile memory which are used to configure the module so that it behaves in a certain

way after powering. These ‘S Registers’ have two attributes; a value and an ID. The ‘ID’ is a positive integer

number used in appropriate commands to read/write the values.

1.2 AT Protocol Mode

1.2.1 AT Protocol Assumptions

The CSR (Cambridge Silicon Radio) Bluetooth chipset in Laird devices has limited memory resources.

Therefore it is NOT proposed that there be full implementation of the AT protocol as seen in modems. The

claim made for this device is that it has a protocol

similar

to an AT modem. In fact, the protocol is similar

Embedded Wireless Solutions Support Center:

http://ews-support.lairdtech.com

www.lairdtech.com/bluetooth

Americas: +1-800-492-2320

Europe: +44-1628-858-940

Hong Kong: +852 2923 0610

Enhanced Class 1 Bluetooth v2.1 Module

Firmware User’s Guide

enough so that existing source code written for modems can be used with very little modification with a Laird

device.

Therefore the following assumptions are made:



All commands terminate by the carriage return character 0x0D, represented by the string <cr> in

subsequent sections. It cannot be changed at runtime.

All responses from the Laird device have carriage return and linefeed characters preceding and

appending the response. These dual character sequences have the values 0x0D and 0x0A respectively

and are represented by the string <cr,lf>.

All Bluetooth addresses are represented by a fixed 12 digit case insensitive hexadecimal string.

All Bluetooth Device Class codes are represented by a fixed 6 digit case insensitive hexadecimal string.

Most new Bluetooth specific commands are identified by the string +BTx, where x is generally a

mnemonic of the intended functionality.

1.2.2 Protocol Activation

Depending on the variant of the module, the AT protocol needs to activate so that on power up it presents

this protocol interface instead of the alternate multipoint protocol.

The method that is always available and works is activation via S Register 255 in multipoint mode (and

mapped to 9255 in AT mode), where setting a value of 1 selects multipoint packet protocol and a value of 2

selects AT protocol.

Note:

Changes to this S register store in non-volatile memory at time of change and does not require the

AT&W command (or the equivalent in multipoint mode CMD_STORE_REG) to commit to non-

volatile memory.

Optionally, some firmware variants allow a value of 0 in this S Register and in this case on power up the

protocol selection depends on the state of one of the GPIO pins (user settable) so that one state forces AT

and the other forces multipoint.

1.3 AT Commands and Responses

This section describes all available AT commands. Many commands require mandatory parameters and some

take optional parameters. These parameters are integer values, strings, Bluetooth addresses or device classes.

The following convention is used when describing the various AT commands, and the response to a

command is also stated.

<bd_addr>

A 12 character Bluetooth address consisting of ASCII characters ‘0’ to ‘9’, ‘A’ to ‘F’

and ‘a’ to ‘f’.

A 6 character Bluetooth device class consisting of ASCII characters ‘0’ to ‘9’, ‘A’ to ‘F’

and ‘a’ to ‘f’.

A positive integer value.

An integer value which could be positive or negative, which can be entered as a

decimal value or in hexadecimal if preceded by the ‘$’ character.

E.g. the value 1234 can also be entered as $4D2

A string delimited by double quotes. E.g. "Hello World". The " character MUST be

supplied as delimiters.

A 4 character UUID number consisting of ASCII characters ‘0’ to ‘9’, ‘A’ to ‘F’ and ‘a’

to ‘f’.

Americas: +1-800-492-2320

Europe: +44-1628-858-940

Hong Kong: +852 2923 0610

<uuid>

Embedded Wireless Solutions Support Center:

http://ews-support.lairdtech.com

www.lairdtech.com/bluetooth

DVK-BT740-SC Related Products

	DVK-BT740-SC	DVK-BT740-SA	BT740-SA	BT740-SC
Description	DEV KIT FOR BT740 V2.1 U.FL	DEV KIT FOR BT740 V2.1	RF TXRX MOD BLUETOOTH CHIP ANT	RF TXRX MODULE BLUETOOTH U.FL
frequency	2.4GHz	2.4GHz	2.4GHz	2.4GHz

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