BT Audio 2 Click

BT Audio 2 Click is Bluetooth audio stream add on board based on BM62 module from Microchip. It's a Stereo Audio module which is fully qualified Bluetooth v5.0 dual-mode (BDR/EDR/BLE) to be added in any wireless audio and voice application. With features like high resolution up to 24-bit, 96 kHz audio data format, Bluetooth Low Energy data rate up to 1Mbits/s, connection of two hosts with HFP/A2DP profiles simultaneously, seamless serial data over UART interface and many more it's perfect solution for applications like portable speakers and headsets.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Feb 2024.
• Type : UART type

Software Support

We provide a library for the BT Audio 2 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for BT Audio 2 Click driver.

Standard key functions :

• btaudio2_cfg_setup Config Object Initialization function.

  void btaudio2_cfg_setup ( btaudio2_cfg_t *cfg );

• btaudio2_init Initialization function.

  err_t btaudio2_init ( btaudio2_t *ctx, btaudio2_cfg_t *cfg );

• btaudio2_default_cfg Click Default Configuration function.

  err_t btaudio2_default_cfg ( btaudio2_t *ctx );

Example key functions :

• btaudio2_set_device_name This function sets the local device name.

  err_t btaudio2_set_device_name ( btaudio2_t *ctx, uint8_t *device_name );

• btaudio2_make_call This function makes a call to the specified phone number.

  err_t btaudio2_make_call ( btaudio2_t *ctx, uint8_t database_index, uint8_t *phone_number );

• btaudio2_volume_up This function increases the volume of a specified gain mask.

  err_t btaudio2_volume_up ( btaudio2_t *ctx, uint8_t database_index, uint8_t mask );

Example Description

This example demonstrates the use of BT Audio 2 Click board by reading the commands received from remote device and performing adequate actions accordingly.

The demo application is composed of two sections :

Application Init

Initializes the driver and configures the Click board.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    btaudio2_cfg_t btaudio2_cfg;  /**< Click config object. */

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.
    btaudio2_cfg_setup( &btaudio2_cfg );
    BTAUDIO2_MAP_MIKROBUS( btaudio2_cfg, MIKROBUS_1 );
    if ( UART_ERROR == btaudio2_init( &btaudio2, &btaudio2_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( BTAUDIO2_OK != btaudio2_default_cfg ( &btaudio2 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    if ( BTAUDIO2_OK != btaudio2_set_device_name ( &btaudio2, DEVICE_NAME ) )
    {
        log_error( &logger, " Set device name." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
}

Application Task

Reads all the received events and parses them.

void application_task ( void )
{
    if ( BTAUDIO2_OK == btaudio2_read_event ( &btaudio2 ) ) 
    {
        btaudio2_event_handler ( &btaudio2 );
    }
}

Note

We have used the Serial Bluetooth Terminal smartphone application for the test. A smartphone and the Click board must be paired in order to exchange messages with each other. So make sure to pair your device with the Click board and connect it to using the Serial Bluetooth Terminal application, then you will be able to send commands listed below.

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.BTAudio2

Additional notes and informations

Depending on the development board you are using, you may need USB UART Click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.