Microchip Technology IS2083 Series Guide

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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
OR
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
OR

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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.