PSOC™ Edge MCU: Bluetooth® Classic A2DP Source with AVRCP

This example demonstrates the functionality of Bluetooth® Classic Advanced Audio Distribution Profile (A2DP) Source and Audio/Video Remote Control Profile (AVRCP) on the CM33 project. It utilizes SBC (Low Complexity Subband Coding) encoding of audio data in the PSOC™ Edge MCU.

In this example, CM33 retrieves raw PCM audio data from a raw WAV file stored in flash. The raw audio data is then encoded using SBC. The encoded data is sent to an external A2DP Sink device, such as a Bluetooth® speaker, to play the pre-recorded audio stored in the PSOC™ Edge MCU.

This code example has a three-project structure: CM33 secure, CM33 non-secure, and CM55 projects. All three projects are programmed to the external QSPI flash and executed in Execute in Place (XIP) mode. Extended boot launches the CM33 secure project from a fixed location in the external flash, which then configures the protection settings and launches the CM33 non-secure application. Additionally, CM33 non-secure application enables the CM55 CPU and launches the CM55 application.

View this README on GitHub.

Provide feedback on this code example.

See the Design and implementation for the functional description of this code example.

Requirements

ModusToolbox™ v3.6 or later (tested with v3.6)
Board support package (BSP) minimum required version: 1.0.0
Programming language: C
Associated parts: All PSOC™ Edge MCU parts

Supported toolchains (make variable 'TOOLCHAIN')

GNU Arm® Embedded Compiler v14.2.1 (GCC_ARM) – Default value of TOOLCHAIN
Arm® Compiler v6.22 (ARM)
IAR C/C++ Compiler v9.50.2 (IAR)
LLVM Embedded Toolchain for Arm® v19.1.5 (LLVM_ARM)

Supported kits (make variable 'TARGET')

PSOC™ Edge E84 Evaluation Kit (KIT_PSE84_EVAL_EPC2) – Default value of TARGET
PSOC™ Edge E84 Evaluation Kit (KIT_PSE84_EVAL_EPC4)

Hardware setup

This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly.

Ensure the following jumper and pin configuration on board.

BOOT SW must be in the HIGH/ON position
J20 and J21 must be in the tristate/not connected (NC) position

Software setup

See the ModusToolbox™ tools package installation guide for information about installing and configuring the tools package.

Install a terminal emulator if you do not have one. Instructions in this document use Tera Term.

This example requires no additional software or tools.

Operation

See Using the code example for instructions on creating a project, opening it in various supported IDEs, and performing tasks, such as building, programming, and debugging the application within the respective IDEs.

Connect the board to your PC using the provided USB cable through the KitProg3 USB connector
Open a terminal program and select the KitProg3 COM port. Set the serial port parameters to 8N1 and 115200 baud
After programming, the application starts automatically and displays the CE title "PSOC EDGE MCU: A2DP Source + AVRCP". It scans and lists Bluetooth® A2DP sink devices, and prints their Bluetooth® Device Addresses (BDAs) after loading the Bluetooth® Stack and initializing the background tasks
The blue LED (USER LED3) starts blinking to indicate that advertisement has started

Figure 1. Terminal output after scanning A2DP sink devices
Press the respective device number in the serial terminal. The device will connect and display the following output. The blue LED (USER LED3) stays ON indicating that the device has been connected

Figure 2. Terminal output after connecting to A2DP sink device
If the desired device is not listed during the initial scan, press "y"/"Y" for rescanning

Figure 3. Terminal output after scanning, no A2DP sink devices listed

Note: If you are facing issues pairing with the A2DP sink device, press and hold the user button (SW2) and press the reset button (XRES) for clearing the bonding keys. Once the keys are cleared, it displays the following output. After resetting the bonding keys, reset the kit.

Figure 4. Terminal output after clearing bonding keys
If the connection is successful, you can control the audio playback using A2DP sink device's (speaker or headphones) play/pause button and volume control buttons and it displays the output as per the following:

Figure 5. Terminal play/pause and volume control

The following functions can be used in this example:
- Press "Play/Pause" to play or pause the audio playback
- Press volume "+" to increase the volume
- Press volume "-" to decrease the volume
Pressing the user button (SW2) also controls the play/pause function of the playback

Related resources

Resources	Links
Application notes	AN235935 – Getting started with PSOC™ Edge E8 MCU on ModusToolbox™ software AN236697 – Getting started with PSOC™ MCU and AIROC™ Connectivity devices
Code examples	Using ModusToolbox™ on GitHub
Device documentation	PSOC™ Edge MCU datasheets PSOC™ Edge MCU reference manuals
Development kits	Select your kits from the Evaluation board finder
Libraries	mtb-dsl-pse8xxgp – Device support library for PSE8XXGP retarget-io – Utility library to retarget STDIO messages to a UART port btstack-integration – The btstack-integration hosts platform adaptation layer (porting layer) between AIROC™ BTSTACK and Infineon's different hardware platforms kv-store – This library provides a convenient way to store information as key-value pairs in non-volatile storage
Tools	ModusToolbox™ – ModusToolbox™ software is a collection of easy-to-use libraries and tools enabling rapid development with Infineon MCUs for applications ranging from wireless and cloud-connected systems, edge AI/ML, embedded sense and control, to wired USB connectivity using PSOC™ Industrial/IoT MCUs, AIROC™ Wi-Fi and Bluetooth® connectivity devices, XMC™ Industrial MCUs, and EZ-USB™/EZ-PD™ wired connectivity controllers. ModusToolbox™ incorporates a comprehensive set of BSPs, HAL, libraries, configuration tools, and provides support for industry-standard IDEs to fast-track your embedded application development

Other resources

Infineon provides a wealth of data at www.infineon.com to help you select the right device, and quickly and effectively integrate it into your design.

Document history

Document title: CE242107 – PSOC™ Edge MCU: Bluetooth® Classic A2DP Source with AVRCP

Version	Description of change
1.x.0	New code example Early access release
2.0.0	GitHub release

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Infineon/mtb-example-psoc-edge-btstack-a2dp-source

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