Library Description

The library covers all the necessary functions to control BT Click board™. Library performs a standard UART interface communication.

Key functions:

• void bt_send_data ( uint8_t *tx_data, uint8_t len ) - Send data function
• uint16_t bt_get_data ( uint8_t *rx_data ) - Get response data function.
• void bt_hw_reset ( void ) - HW reset function.

Examples description

The application is composed of three sections :

• System Initialization - Initializes UART, sets AN, RST, CS and PWM pins as outputs and set INT pin as input and begins to write a log.
• Application Initialization - Initialization driver enables - UART, enable uart interrupt routine, perform intro start the module, after that we configure the module: set local BT name ( BT Click ), set the Bluetooth Classic Class of Device ( COD ), set whether the device accepts new bondings, set Bluetooth Classic visibility and connectability and start a RFCOMM server as defined in the referenced SDP-entry.
• Application Task - (code snippet) This example demonstrates the use of the BT Click board™. After module configuration, you can establish a Bluetooth Classic connection with a BT Click. If the click connection is successful, the blue LED turns on and communication is possible. Also, if the Bluetooth Classic connection is disconnected, the red LED turns on. The messages sent via a mobile phone are displayed on the Usart Terminal. Results are being sent to the Usart Terminal where you can track their changes.

void application_task ( )
{
    if ( bt_get_data_status( ) == BT_NEW_DATA_AVAILABLE )
    {
        rsp_data_num = bt_get_data( &rsp_data_buf[ 0 ] );

        if ( rsp_data_num != 0 )
        {
            len = rsp_data_buf[ 5 ];
            len += 5;

            if ( rsp_data_buf[ 2 ] == BT_NEW_EVT_RX_DISCONN_DATA )
            {
                display_evt_bt_conn_close( );

                display_evt_endpoint_data( );
            }
            
            if ( rsp_data_buf[ 2 ] == BT_NEW_EVT_CONNECTED )
            {
                display_evt_bt_conn_opened( );
            }
        }
    }
}

• void intro_device_start ( ) - Start the module.
• void display_response ( ) - Display response.
• void display_evt_bt_conn_opened ( ) - Display event new connection was opened.
• void display_evt_bt_conn_close ( ) - Display event new connection was closed.
• void display_evt_endpoint_data ( ) - Display event endpoint data.

Other mikroE Libraries used in the example:

• UART
• Conversions

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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.