Microchip Technology RN4870, RN4871 User Manual

RN4870/71 Bluetooth

Low Energy Module

User’s Guide

 2016 Microchip Technology Inc. DS50002466A

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ISBN: 978-1-5224-0515-3

DS50002466A-page 2  2016 Microchip Technology Inc.

Object of Declaration: RN4870/71 Bluetooth® Low Energy Module

 2016 Microchip Technology Inc. DS50002466A-page 3

RN4870/71 Bluetooth® Low Energy Module User’s Guide

NOTES:

DS50002466A-page 4  2016 Microchip Technology Inc.

RN4870/71 BLUETOOTH

LOW ENERGY MODULE

USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 7

Chapter 1. Overview

1.1 Introduction ................................................................................................... 11

1.2 Key Features ................................................................................................ 11

1.3 Command Mode and Data Mode ................................................................. 12

1.4 Accessing the RN4870/71 over UART ......................................................... 13

1.5 RN4870 PIO Control Lines ........................................................................... 13

Chapter 2. Command Reference

2.1 Introduction ................................................................................................... 15

2.2 Command Syntax ......................................................................................... 15

2.3 Set and Get Commands ............................................................................... 15

2.4 Set Commands ............................................................................................. 16

2.5 Get Commands ............................................................................................ 26

2.6 Action Commands ........................................................................................ 27

2.7 List Commands ............................................................................................ 39

2.8 Service Configuration Commands ................................................................ 41

2.9 Characteristic Access Commands ............................................................... 43

2.10 Script Commands ....................................................................................... 46

Chapter 3. Embedded Scripting Feature

3.1 Introduction ................................................................................................... 49

Chapter 4. Connection Examples

4.1 Connecting to RN4870 using SmartDiscover App ....................................... 53

4.2 UART Transparent Connection Using SmartData ....................................... 55

4.3 Module to Module Connection ...................................................................... 57

Appendix A. Bluetooth Low Energy Fundamentals

A.1 Introduction .................................................................................................. 59

Appendix B. Status Response Summary Quick Reference

B.1 Introduction .................................................................................................. 61

Worldwide Sales and Service .................................................................................... 65

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RN4870/71 Bluetooth® Low Energy Module User’s Guide

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RN4870/71 BLUETOOTH

LOW ENERGY MODULE

USER’S GUIDE

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our website (www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is “DSXXXXXXXXA”, where “XXXXXXXX” is the document number and “A” is the revision level of the document.

For the most up-to-date information on development tools, see the MPLAB Select the Help menu, and then Topics to open a list of available online help files.

IDE online help.

INTRODUCTION

This chapter contains general information that will be useful to know before using the RN4870/71 Bluetooth

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Website

• Development Systems Customer Change Notification Service

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the RN4870/71 Bluetooth® Low Energy Module as a development tool to emulate and debug firmware on a target board. The document is organized as follows:

• Chapter 1. “Overview” – This chapter introduces the RN4870/71 Bluetooth Low

Energy Module and provides a brief overview of its various features.

• Chapter 2. “Command Reference” – This chapter provides information on the

commands used to configure the RN4870/71 Bluetooth Low Energy Module with examples.

• Chapter 3. “Embedded Scripting Feature” – This chapter provides the details

of the RN4870/71 Embedded Scripting feature.

• Chapter 4. “Connection Examples” – This chapter provides the steps on how to

establish a connection to RN4870/71 using SmartDiscover, SmartData, and a BLE device.

Low Energy Module. Items discussed in this chapter include:

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RN4870/71 Bluetooth® Low Energy Module User’s Guide

• Appendix A. “Bluetooth Low Energy Fundamentals” – This appendix pro-

vides the Bluetooth Low Energy Fundamentals.

• Appendix B. “Status Response Summary Quick Reference” – This appendix

provides a quick reference of all the status messages returned by RN4870 and summarizes the ASCII commands.

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB® IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces repeated text

A menu path File>Save

A tab Click the Power tab

where N is the total number of digits, R is the radix and n is a digit.

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options]

errorlevel {0|1}

var_name [, var_name...]

void main (void) { ... }

DS50002466A-page 8  2016 Microchip Technology Inc.

1.1 INTRODUCTION

Microchip’s RN4870/71 Bluetooth® Low Energy Module is a fully certified Bluetooth Smart module offering Bluetooth 4.2 connectivity in compact form factor. With all of its advanced features, it allows the Bluetooth Low Energy connectivity to be included in designs with minimal engineering.

The RN4870/71 module uses Microchip's IS1870 Bluetooth Low Energy RF IC. The primary difference between RN4870/71 firmware and the IS1870S factory firmware is that the RN4870/71 provides the control interface based on ASCII commands sent over UART. The ASCII command interface on the RN4870/71 is very similar to that of RN41/42/52/4020/4677, providing an easy migration path for customers currently using the RN modules.

Interactive ASCII commands enable the RN4870/71 to be configured without complex configuration tools. The RN4870/71 supports both peripheral and central Generic Access Profile (GAP) roles, actively scanning for other connectable devices instead of waiting for incoming connection requests.

RN4870/71 BLUETOOTH

LOW ENERGY MODULE

Chapter 1. Overview

USER’S GUIDE

1.2 KEY FEATURES

The RN4870/71 Bluetooth Low Energy Module has the following key features:

1.2.1

The RN4870/71 is controlled primarily through ASCII commands sent from host MCU to UART. The ASCII commands can control functions such as connection setup/teardown, accessing Generic Attribute Profile (GATT) characteristics, changing configuration settings, and reading status. The UART can operate in Command mode, to receive ASCII commands, or Data mode to exchange data using “Transparent UART” Bluetooth service.

1.2.2

The RN4870/71 introduces a private GATT service named as “Transparent UART”. This service simplifies serial data transfers over Bluetooth Low Energy (BTLE) devices. RN4870/71 Transparent UART seamlessly transfer serial data from its UART over a Bluetooth Low Energy connection, providing an end-to-end data pipe to another Bluetooth device such as RN4870/71 module or Smartphone.

1.2.3

The RN4870/71 has the capability to define up to five public and four private custom defined GATT services. Each custom service allows up to eight characteristics. All service definitions are saved in on-board Non-Volatile Memory (NVM) configuration settings.

ASCII Command Interface

Transparent UART

Custom GATT Services

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RN4870/71 Bluetooth® Low Energy Module User’s Guide

Server

x iOS x Android x RN4870 x PC

1.2.4 Embedded Scripting Feature

RN4870/71 supports script functionality. The script capability is unique to Microchip RN modules that enables the user to write ASCII based script into RN4870/71 NVM and automatically execute the application logic through the script. The script capability enables RN4870/71 to run relatively simple operations without a host MCU.

1.2.5

Remote Command Console

RN4870/71 supports Remote Command mode which allows a remote device to access Command mode remotely via Bluetooth link. This feature requires UART Transparent function to be enabled first.

1.3 COMMAND MODE AND DATA MODE

The RN4870/71 operates in two modes: Data mode (default) and Command mode. When RN4870/71 is connected to another BLE device and is in Data mode, the RN4870/71 acts as a data pipe: any serial data sent into RN4870/71 UART is transferred to the connected peer device via Transparent UART Bluetooth service. When data is received from the peer device over the air via Transparent UART connection, this data outputs directly to UART.

For configuration or control operation, or both, set the RN4870/71 into Command mode. In Command mode, all UART data is treated as ASCII commands sent to the module's UART interface.

As illustrated in Figure 1-1, the RN4870/71 can enter and exit Command and Data mode using ASCII command over UART or over configurable PIO.

To enter Command mode from Data mode, type $$$ character sequence after 100 ms delay before the first $. A CMD> prompt is sent to UART to notify the external host of the start of the Command mode. The Data mode escape character can change from $ to another character using S$ command.

To return to Data mode, enter command --- at the command prompt. The END message displays indicating the end of command console session.

In addition to using ASCII Command mode escape character and the command --- to enter/exit Command mode, it is possible to configure a PIO to do the same. This method is more suitable for applications where there is a need for the host MCU to enter and exit the Command mode.

FIGURE 1-1: COMMAND MODE AND TRANSPARENT UART (DATA) MODE

RN4870

---/PIO

HOST

MCU

DS50002466A-page 12  2016 Microchip Technology Inc.

UART

PIO

$$$/PIO

GATT

GATT/Transparent UART

CMD>

BTLE Device

1.4 ACCESSING THE RN4870/71 OVER UART

The most common application for the host MCU to control the RN4870/71 is via ASCII commands. For development and prototyping purposes, using a terminal emulator to send commands and data over UART is recommended. Any terminal emulator, such as TeraTerm (Windows figure the RN4870/71 via UART on host PC.

With the RN4870/71 connected to a computer and a serial port enumerated for the UART port, run the terminal emulator to open the COM port using the port settings defined in Tab le 1 -1 .

TABLE 1-1: DEFAULT UART SETTINGS

UART Setting Default value

Baud Rate 115200

Data Bits 8

Stop Bits 1

Flow Control Disabled

To enter Command mode, type $$$ into the terminal emulator. Once RN4870/71 enters Command mode, the string CMD> is sent by the module via the UART to indicate the start of Command mode session.

Once in Command mode, valid ASCII commands can be issued to control or configure the RN4870/71. All commands end with a carriage return <cr> and are always responded to by the RN4870/71. Any subsequent command must not be issued until a response is received for the previous command.

For Set or Action commands, AOK indicates a positive or successful response while ERR indicates an error or negative response. By default, when the RN4870/71 is ready to receive the next command, the command prompt CMD> is sent to UART.

To return to Data mode, type ---<cr>. The RN4870/71 automatically enters Data mode once connected or disconnected with another device, if UART Transparent feature is enabled.

) or CoolTerm (Mac OS-X®), can be used to control and con-

Parity None

Note: The module supports Fast Data mode. In this mode, the module does not

enter Command mode even if it receives $$$. To enable Fast Data mode, use command SR.

1.5 RN4870 PIO CONTROL LINES

RN4870/71 shares the same General Purpose Input Output (GPIO) control interface with IS1870S. Up to 12 GPIO pins are configurable to perform various functionalities through IS1870S UI tool. The RN4870/71 is compatible with any IS1870S tool and allows user configurations. For more information, refer to “RN4870/71 Bluetooth

Low Energy Module Data Sheet” (DS50002489A) and “IS1870/71 Bluetooth Energy (BLE) SoC Data Sheet” (DS60001371).

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4.2

RN4870/71 Bluetooth® Low Energy Module User’s Guide

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Chapter 2. Command Reference

2.1 INTRODUCTION

The RN4870/71 supports a variety of UART commands for controlling and configuration. This chapter describes these commands in detail and provides examples.

2.2 COMMAND SYNTAX

The ASCII command syntax is a keyword followed by optional parameters.

• ASCII commands are divided into multiple groups:

- Set Commands

- Get Commands

- Action Commands

- List Commands

- Service Configuration Commands

- Characteristic Access Commands

- Script Commands

• All commands contain one, two or three case-insensitive characters

• Delimit command and any argument with a comma

• Text data is case sensitive such as Bluetooth name

• All commands end with carriage return ('\r', \x0d)

• Get commands return the value requested by the corresponding command to be retrieved. Most of the other commands return either AOK (<AOK><CR>) that indicates a positive response or ERR (<ERR><CR>), as a negative response.

All configuration changes made by Set commands are stored in the Non-Volatile Memory (NVM) and survive the power cycle. Any configuration changes takes effect after a reboot.

For a list of all commands, refer to Tab le B- 2 in Appendix B. “Status Response

Summary Quick Reference”.

RN4870/71 BLUETOOTH

LOW ENERGY MODULE

USER’S GUIDE

2.3 SET AND GET COMMANDS

Set and Get commands are used to configure features and functions of the RN4870/71 module. The format of the Set and Get commands are provided in Tab l e 2 -1 . The Set command starts with character “S” and followed by one or two character configuration identifier. All Set commands take at least one parameter that is separated from the command by a comma. Set commands change configurations and take effect after rebooting either via R,1 command, hard Reset, or power cycle.

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RN4870/71 Bluetooth® Low Energy Module User’s Guide

Most Set commands have a corresponding Get command to retrieve and output the current configurations via the UART. Get commands have the same command identifiers as Set commands but without parameters.

TABLE 2-1: SET AND GET COMMANDS SYNTAX FORMAT

Command

Type

S Command Identifier , Input Parameter <CR> SN,DeviceName // Set device name G Command Identifier <CR> GN // Get device name

Command ID Delimiter Parameter(s)

2.4 SET COMMANDS

2.4.1 S-,<string>

This command sets a serialized Bluetooth name for the device, where <string> is up to 15 alphanumeric characters. This command automatically appends the last two bytes of the Bluetooth MAC address to the name which is useful for generating a custom name with unique numbering.This command does not have corresponding get command.

Default: N/A Example: S-,MyDevice // Set device name to “MyDevice_XXXX”

Response: AOK

ERR

// Success // Syntax error or invalid parameter

End of

Command

Example

2.4.2

S$,<char>

This command sets the Command mode character, where <char> is a single character in the three character pattern. This setting enables the user to change the default character to enter Command mode ($$$) to another character string. Restoring the factory defaults returns the device to use $$$.

Default: $ Example: S$,# // Set ### as string to enter Command mode

Response: AOK

ERR

2.4.3

S%,<pre>,<post>

// Success // Syntax error or invalid parameter

This command sets the pre and post delimiter of the status string from RN4870/71 to the host controller. The pre and post delimiter are up to four printable ASCII characters. If no parameter is given to the post delimiter, then the post delimiter is cleared; if no parameter is given to the pre-delimiter, then both pre and post delimiters are cleared.

Default: % Example: S%,<$,#> // Set pre delimiter to <$ and post delimiter to #>

// When the output status string is Reboot instead // of %REBOOT%, the output is <$REBOOT#>

Response: AOK

ERR

// Success // Syntax error or invalid parameter

DS50002466A-page 16  2016 Microchip Technology Inc.

2.4.4 S:,<H16>,<Hex>

This command is used to change any settings in configuration NVM.

This command expects two parameters. The first parameter is a 16-bit hex value that represents memory address of eFlash of the first byte of data. If more than one byte of data is provided, the memory address automatically increases. The second parameter is the data value in HEX format, up to 32 bytes.

CAUTION

This command must be used with caution to avoid corrupting the NVM configuration settings. Consult the Microchip Representatives for detailed memory layout of NVM configuration settings.

Default: N/A Example: S:,0006,41424300 // Set device name to be ABC, where device

// name is stored in eFlash starting from // memory shift address 0x0006

Response: AOK

ERR

// Success // Syntax error or invalid parameter

2.4.5

SA,<1-3>

The Set Authentication command sets RN4870/71 Input/Output (I/O) capability which decides authentication method to be used when securing BLE link. The parameters are described in Tab le 2- 2.

Once a remote device exchanges pin codes with the RN4870/71 device, a link key is stored for future use. The device automatically and permanently stores up to eight peer devices in flash memory.

TABLE 2-2: SET I/O CAPABILITY

Value Description

1 Display Yes/No. If authentication is enabled, RN4870/71 must display the pin code

to enable remote peer device to input the same pin code.

2 No I/O Capability. This mode works without request to display or input any security

pin.

3 Keyboard I/O. If authentication is enabled, RN4870/71 must input the pin code that

displays on the remote peer device.

Default: 2 Example: SA,1 // Set device to be able to display pin

Response: AOK

ERR

// Success // Syntax error or invalid parameter

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RN4870/71 Bluetooth® Low Energy Module User’s Guide

2.4.6 SB,<H8>

This command sets the baud rate of the UART communication. The input parameter is an 8-bit hex value in the range of 00 to 0B, representing baud rate from 2400 to 921K, as shown in Ta bl e 2 -3 .

TABLE 2-3: UART BAUD RATE SETTINGS

Setting Baud Rate

00 921600 01 460800 02 230400 03 115200 04 57600 05 38400 06 28800 07 19200 08 14400 09 9600 0A 4800 0B 2400

Default: 03 Example: SB,07 // Set the UART baud rate to be 19200

Response: AOK

ERR

2.4.7

SC,<0-2>

// Success // Syntax error or invalid parameter

This command configures the beacon feature. It expects one single digit input parameter as described in Ta bl e 2 - 4.

TABLE 2-4: BEACON MODE SETTINGS

Setting Beacon Mode

0 Beacon feature is disabled 1 Beacon feature is enabled; connectable advertisement is dis-

abled

2 Non-connectable beacon and connectable advertisement are

both enabled.

Refer to commands IB (2.6.20) and NB (2.6.21) to configure beacon payload.

Default: 0 Example: SC,2 // Enable both beacon and advertisement

Response: AOK

ERR

// Success // Syntax error or invalid parameter

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2.4.8 SDA,<H16>

This command sets the appearance of RN4870/71 in GAP service. It expects one 16-bit hex input parameter. Bluetooth SIG defines the appearance code for different devices. Please refer to Bluetooth SIG web site for details (https://www.bluetooth.org/en-us).

Default: 0000 Example: SDA,0340 // Set appearance to be Generic Heart Rate Sensor

2.4.9

This command sets the value of firmware revision characteristic in the Device Information Service. This command is only effective if the Device Information service is enabled by command SS.

Device Information Service is used to identify the device. All its characteristics rarely change. Therefore, values of characteristics in Device Information Service can be set and saved into NVM. All values of characteristic in Device Information Service have the maximum size of 20 bytes. For more information on Device Information Service visit

https://developer.bluetooth.org/TechnologyOverview/Pages/DIS.aspx and https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.device_information.xml

Default: Current RN4870 firmware version

Example: SDF,0.9

Response: AOK

2.4.10

This command sets the value of the hardware revision characteristics in the Device Information Service. This command is only effective if the Device Information service is enabled by command SS.

SDF,<text>

ERR

SDH,<text>

// Success // Device Info service not enabled. // Syntax error, invalid parameter

Default: Current hardware version

Example: SDH,2.1

Response: AOK

ERR

2.4.11

This command sets the model name characteristics in the Device Information Service. This command is only effective if the Device Information service is enabled by command SS.

Default: RN_BLE

Example: SDM,RN4870

Response: AOK

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SDM,<text>

ERR

// Success // Device Info service not enabled. // Syntax error, invalid parameter

RN4870/71 Bluetooth® Low Energy Module User’s Guide

2.4.12 SDN,<text>

This command sets the manufacturer name characteristics in the Device Information Service. This command is only effective if the Device Information service is enabled by command SS.

Default: Microchip

Example: SDN,Microchip

Response: AOK

ERR

// Success // Device Info service not enabled. // Syntax error, invalid parameter

2.4.13

This command sets software revision in the Device Information Service. This command is only effective if the Device Information service is enabled by command SS.

Default: Current Software Revision

Example: SDR,1.0

Response: AOK

2.4.14

This command sets the value of serial number characteristics in the Device Information Service. This command is only effective if the Device Information service is enabled by command SS.

Default: N/A

Example: SDS,12345678

Response: AOK

2.4.15

SDR,<text>

ERR

SDS,<text>

ERR

SF,1

// Success // Device Info service not enabled. // Syntax error, invalid parameter

This command resets the configurations into factory default. The first parameter must be 1.

Example: SF,1

Response: Reboot after Factory Reset

ERR

Note: This command causes an immediate reboot after invoking it.

DS50002466A-page 20  2016 Microchip Technology Inc.

// Reboot // Syntax error or invalid parameter

+ 45 hidden pages

Microchip Technology RN4870, RN4871 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

1.1 INTRODUCTION

Chapter 1. Overview

1.2 KEY FEATURES

ASCII Command Interface

Transparent UART

Custom GATT Services

1.2.4 Embedded Scripting Feature

Remote Command Console

1.3 COMMAND MODE AND DATA MODE

FIGURE 1-1: COMMAND MODE AND TRANSPARENT UART (DATA) MODE

1.4 ACCESSING THE RN4870/71 OVER UART

TABLE 1-1: DEFAULT UART SETTINGS

1.5 RN4870 PIO CONTROL LINES

Chapter 2. Command Reference

2.1 INTRODUCTION

2.2 COMMAND SYNTAX

2.3 SET AND GET COMMANDS

TABLE 2-1: SET AND GET COMMANDS SYNTAX FORMAT

2.4 SET COMMANDS

2.4.1 S-,<string>

S$,<char>

S%,<pre>,<post>

2.4.4 S:,<H16>,<Hex>

SA,<1-3>

TABLE 2-2: SET I/O CAPABILITY

2.4.6 SB,<H8>

TABLE 2-3: UART BAUD RATE SETTINGS

SC,<0-2>

TABLE 2-4: BEACON MODE SETTINGS

2.4.8 SDA,<H16>

SDF,<text>

SDH,<text>

SDM,<text>

2.4.12 SDN,<text>

SDR,<text>

SDS,<text>

SF,1