Microchip Technology IS2083 Series Leitfaden

2021 Microchip Technology Inc. DS00003118C-Page 1

INTRODUCTION

The BM83 module is a flash-based Bluetooth Stereo

Audio module built using Microchip’s IS2083 SoC. The

turnkey solution as mentioned in Table 1 integrates the

Bluetooth stack, profiles, and audio/voice processing to

enable Bluetooth audio capability and customize DSP

tuning for an end user application.

This application note describes how to implement and

use the following solutions using the BM83 module:

• Multi-Speaker (MSPK):

- Microchip's Wireless Concert Technology

(WCT) is a distributed audio solution that

synchronizes multiple speakers from one

audio source. This is also known as Multi-

speaker (MSPK) solution.

• Audio Transceiver (AT):

- With AT firmware, the BM83 serves as an

audio source that transmits A2DP music to

standard Bluetooth devices.

• Google Fast Pairing (GFP):

- Uses Bluetooth Low Energy to discover

nearby Android devices, thus eliminating

some of the steps in pairing process.

The BM83 supports the following standard features

along with other features listed in the following table.

• HFP, A2DP and AVRCP

• Audio Mixer

• Bluetooth Low Energy Transparent Service

• OTA Tuning and OTA DFU

• UART Command for Host MCU

• Microchip Bluetooth Audio (MBA) App

Compatibility

The Microchip Bluetooth Audio (MBA) mobile app

connects to the BM83 Bluetooth devices to create an

audio network, adjust EQ settings, volume control, and

perform Over-the-Air (OTA) DSP tuning and firmware

upgrade functions.

Table 1 lists the firmware targets created to support

different functionality as memory constraints do not

allow all features to be implemented in one firmware

image. Each target consists of a firmware image and

default configuration settings. The firmware targets are:

• Phone Book Access Profile (PBAP)

• Google Fast Pairing (GFP)

• Serial Port Profile (SPP)

• Audio Transceiver (AT)

The Config GUI Tool is provided along with the BM83

module to optimize the Noise Reduction (NR), Acoustic

Echo Cancellation (AEC), Audio Mixer and Equalizer

(EQ) Filtering. The BM83 module supports the

following modes:

• Host mode (default configuration):

- Uses the host MCU for advanced system

control

- See Figure 53 to enable this mode using the

Config GUI Tool

TABLE 1: FEATURES SUPPORTED BY BM83

Features

Firmware Targets

PBAP GFP SPP AT

Type Code and Binary Image

Standard Features Y Y Y Y (Rx mode)

A2DP Source N N N Y (Tx mode)

PBAB Y N N N

iAP2/SPP N N Y N

MSPK N Y Y N

AVCRPBrowsing YNYN

Google Fast Pair N Y N N

Legend: Y = Supported, N = Not supported

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IS2083/BM83 Bluetooth®Applications Design Guide

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• Embedded mode:

- Obviates the use of host MCU

- See Figure 54 to enable this mode using the

Config GUI Tool

The IS2083 Software Development Kit (SDK) provides

an opportunity to develop custom code to eliminate the

use of an external host (refer to IS2083 SDK User's

Guide (DS50002894)).

The BM83 supports JTAG for debugging. For details,

refer to IS2083 SDK Debugger User's Guide

(DS50002892).

The BM83 firmware consists of:

• 8051 firmware

• DSP firmware

• Config settings

The Config GUI Tool is used to customize parameters.

For more details, refer to Appendix B: “Customizing

UI and DSP Parameters”.

BM83 firmware can be upgraded using one of the

following methods:

1. Regular method - BM83 devices are put in Test

mode through P3_4 GPIO and using isUpdate

Tool, the BM83 image is updated through UART.

2. OTA DFU - BM83 image is updated through

MBA app. For more details, refer to Appendix

L: “DFU- Over-The-Air Upgrade Procedure”.

3. MCU DFU - BM83 image is updated through

MCU using DFU command #0x49. For more

details, refer to Appendix R: “MCU DFU”.

Note: For more information on the SDK, SDK

User’s Guide, and SDK Debugger Guide,

contact a Microchip sales representative.

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1.0 QUICK REFERENCES

1.1 Reference Documentation

For additional information, refer to the following

documents:

•BM83 Bluetooth®Audio Development Board

User's Guide (DS50002902)

•IS2083 Bluetooth®Stereo Audio SoC Data Sheet

(DS70005403)

•BM83 Bluetooth®Stereo Audio Module Data

Sheet (DS70005402)

• IS2083 SDK User’s Guide

• IS2083 SDK Debugger User’s Guide

• IS2083 isUpdate Tool User’s Guide

1.2 Software Prerequisites

• IS2083 firmware

• Host MCU firmware

• isUpdate tool

• Config GUI tool

• Microchip Bluetooth Audio Application for

smartphone

Note: For a complete list of development support tools, documentation, and software tools downloads, visit http:/

/www.microchip.com/BM83 or http://www.microchip.com/IS2083.

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2.0 MULTI-SPEAKER SOLUTION

The Multi-Speaker (MSPK) Bluetooth Audio solution

utilizes Microchip proprietary technology to connect a

central speaker to one or multiple peripheral speakers

through a modified Bluetooth protocol. Multi-Speaker

functionality is implemented using Microchip’s

IS2083BM device. One (central) speaker can be

connected to a Bluetooth-enabled device (such as a

smartphone, tablet or laptop). A central/speaker can be

connected to a device (phone or tablet), over Bluetooth

or AUX-in jack or built-in microphone, and re-transmit

either of the two audio sources to one or more

speakers acting as a peripheral.

Multi-Speaker solutions can be achieved using

IS2083BM devices, which allow for extended range.

This is a widely used technology for applications such

as PA conference systems or wireless audio

throughout indoor or outdoor.

Multi-Speaker can be provisioned to Concert mode

(one central speaker with one or more peripheral

speakers) or in Stereo mode (a left-channel and a right-

channel speaker). For more details, refer to “MSPK

Demo Setup” and “Firmware Capabilities/

Features”.

Figure 1 illustrates a typical Concert mode application

where the central is connected to a Bluetooth-enabled

device.

FIGURE 1: CONCERT MODE: CENTRAL IS CONNECTED TO BLUETOOTH ENABLED DEVICE

OVER BLUETOOTH

Smartphone or Tablet

IS2083BM

Central

Speaker

IS2083BM

Peripheral

Speaker

IS2083BM

Peripheral

Speaker

IS2083BM

Peripheral

Speaker

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Figure 2 illustrates a typical Concert mode application

where the central is connected to a Bluetooth-enabled

device through AUX-In.

FIGURE 2: CONCERT MODE: CENTRAL IS CONNECTED TO BLUETOOTH-ENABLED DEVICE

THROUGH AUX-IN

Figure 3 illustrates a typical Concert mode application

where the central is connected to a Bluetooth-enabled

device through a built-in analog microphone or built-in

digital microphone. Refer to Appendix W: “MIC as

Input in MSPK” for the Config GUI setting.

FIGURE 3: CONCERT MODE: CENTRAL IS CONNECTED TO BLUETOOTH-ENABLED DEVICE

THROUGH BUILT-IN ANALOG MICROPHONE OR BUILT-IN DIGITAL MICROPHONE

Figure 4 illustrates a typical Stereo mode application

where the central is connected to a Bluetooth-enabled

device.

Alternative Audio

Source

(Amplifier, Sound bar,

Stereo etc.)

Smartphone/Tablet

Aux-in

Connection

IS2083BM

Central

Speaker

IS2083BM

Peripheral

Speaker

IS2083BM

Peripheral

Speaker

IS2083BM

Peripheral

Speaker

Alternative Audio

Source

(Amplifier, Sound bar,

Stereo etc.)

IS2083BM

Central

Speaker

IS2083BM

Peripheral

Speaker

IS2083BM

Peripheral

Speaker

IS2083BM

Peripheral

Speaker

Built-in Analog Mic

or Digital Mic

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FIGURE 4: STEREO MODE: CENTRAL IS CONNECTED TO BLUETOOTH-ENABLED DEVICE

Figure 5 illustrates a typical Stereo mode application

where the central is connected to a Bluetooth-enabled

device through AUX-In.

FIGURE 5: STEREO MODE: CENTRAL IS CONNECTED TO BLUETOOTH-ENABLED DEVICE

THROUGH AUX-IN

IS2083BM

Central

Speaker

IS2083BM

Peripheral

Speaker

Smartphone or Tablet

Alternative Audio

Source

(Amplifier, Sound bar,

Stereo etc.)

Smartphone/Tablet

Aux-in

Connection

IS2083BM

Central

Speaker

IS2083BM

Peripheral

Speaker

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2.1 MSPK Demo Requirements

2.1.1 SOFTWARE REQUIREMENTS

• 8051 firmware

• DSP firmware

• Config settings

• Microchip Bluetooth Audio (MBA) mobile

application

2.1.2 HARDWARE REQUIREMENTS

• The BM83 Bluetooth Audio Development Kit

(DM164152):

- BM83 Evaluation Board (BM83 EVB)

- Type-A to Micro-B USB cable

- 15V DC power adapter

• Bluetooth-enabled smartphone:

- Android™ device running Android 6.0 or later

version

- iOS phone

• Speaker, microphone or headset

• MPLAB REAL ICE/MPLAB ICD 3/PICkit™ 3

• Speakers which accept L+/- and R+/- as input

2.1.3 TOOLS

• isUpdate tool

• Config GUI tool

• MPLAB®Integrated Development Environment

(MPLAB X IDE) tool

• Microchip Bluetooth Audio (MBA) mobile applica-

tion

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2.2 MSPK Demo Setup

The BM83 module supports following modes of

operation in Multi-Speaker solution:

• Embedded mode

• Host mode

2.2.1 EMBEDDED MODE DEMO SETUP

1. Slide SW300 to the ON position to put BM83 into

Test mode.

2. Connect the BM83 EVB with a mini USB and

toggle SW200 switch to the 5V_USB position.

3. Program the MSPK firmware, DSP firmware,

and Config settings (Embedded mode) from the

BM83 MSPK2v1.x package

(IS2083 Turnkey v1.x\Software\IS2083

Image\MSPK2v1.y\SPP\Embedded Mode) into

the BM83 using isUpdate tool. Refer to BM83

Bluetooth®Audio Development Board User’s

Guide, chapter 5. Flash Update for details.

4. Once programming is completed, slide SW300

to position 1 to put device into Application mode.

Refer to Table 2 for Embedded mode button

functionality. By default, BM83 EVB is preconfig-

ured with Embedded mode settings.

5. Repeat step 1 to step 4 with all other EVBs.

2.2.2 HOST MODE DEMO SETUP

1. Follow steps 1 to step 2 from Section 2.2.1

“Embedded Mode Demo Setup” and choose

host mode firmware from BM83 MSPK2v2.1

package (IS2083 Turnkey v1.x\Software\IS2083

Image\MSPK2v1.y\SPP\Host Mode) in step 3.

2. Once programming is completed, slide SW300

to position 1 to put the device into Application

mode. Refer BM83 Bluetooth®Audio Develop-

ment Board User’s Guide, Appendix F: Hard-

ware Setup for Application Demo in Host MCU

Mode. Refer to Table 2 for Host mode button

functionality.

3. Program PIC32 with the PIC32 hex file provided

in the package (\IS2083 Turnkey v1.x\Soft-

ware\PIC32 Image\MSPK2v1.y). Refer to BM83

Bluetooth®Audio Development Board User’s

Guide, Appendix E: Updating PIC32 MCU

Parameters.

4. Repeat steps 1 to 3 with all other EVBs.

Note: To program MSPK firmware (image1),

DSP firmware (image2), and Config set-

tings (image3), the image num value must

be selected as 3 in the isUpdate Tool.

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2.2.3 CONNECTION

Connect the speakers to R/L+/- on (CN1 and CN2) the

BM83 EVB as shown in the following figure.

FIGURE 6: SPEAKERS CONNECTED TO THE AUDIO DAUGHTER CARD

2.2.4 POWER-UP

Connect all the BM83 EVBs to a 15V supply and

change the SW200 switch to the 5V_DC position to

turn on the system.

2.2.5 INSTALLATION

Install the Microchip Bluetooth Audio app on an

Android 6.0 or higher device. Refer to the procedure in

Appendix A: “Android App Installation” to install the

Android application.

2.2.6 PROVISIONING

Multi-Speaker can be provisioned to Concert/Stereo

mode either through pressing the button on the BM83

EVB or through the Microchip Bluetooth Audio app

utilizing BLE UART Transparent mode command.

2.2.7 FUNCTIONALITY OF BUTTONS ON

THE BM83 EVB

The BM83 EVB provides various button functionality.

The following table provides different button

functionality mappings between Host mode and

Embedded mode.

The Android version of the Microchip Bluetooth Audio App is available in the Google Play™ Store and the iOS version

of the app is available in the Apple iTunes®store.

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Note 1: To locate these buttons, refer to Figure 7.

The preceding table shows the default button

functionality for Host mode, which is fixed in PIC32

source code. However, the button functionality in the

PIC32 code can be changed by changing the

command associated with the buttons.

Similarly, button functionality can also be changed in

Embedded mode by re-assignment of GPIO in the

Config UI tool. Button functionality can be configured

using the Config UI tool. Refer to Appendix I: “Button

Configuration”.

TABLE 2: BM83 EVB BUTTONS FUNCTIONALITY

Function Host Mode (1) Embedded Mode

Power-on and entering into Pairing

mode

Short press SEL (SW711) Long press for 2.4 seconds MFB

(SW701)

To enter into Central/Peripheral

mode in Concert mode and to start

grouping

Long press for 1 second VOL UP

(SW702)

Long press for 2 seconds VOL UP

(SW702)

To enter into Central/Peripheral

mode in Stereo mode and to start

grouping

Long press for 1 second VOL DN

(SW705)

Long press for 2 seconds VOL DN

(SW705)

To add a new Peripheral to the

Central in Concert mode

Short double press VOL UP (SW702) Long press VOL UP and VOL DN but-

tons at the same time

To power-off Short press SEL (SW711) Long press for 3.2 seconds MFB

(SW701)

To enter Pairing mode Long press SEL (SW711) Long press MFB

Note: The short press is shorter than 1 second.

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