Library Description

The library covers all the necessary functions to control Bluetooth 2 Click board. A library performs the communication with the device via UART interface with WT41U-A Bluetooth 2 module.

Key functions:

• void bluetooth2_write_byte ( uint8_t input ) - Write Single Byte.
• uint8_t bluetooth2_read_byte ( void ) - Read Single Byte.
• void bluetooth2_uart_write ( uint8_t *tx_data ) - UART write function.

Examples description

The application is composed of three sections :

• System Initialization - Initializes peripherals and pins.
• Application Initialization - Initializes UART serial interface, UART interrupt, and write log.
• Application Task - (code snippet) - This function allows user to enter a commands, module configurations, data which will be transmitted, and also to check all module and connection status by using the serial terminal. Note: XX:XX:XX:XX:XX:XX replace with your device's Bluetooth address. Special commands: Press 'Enter' when you want to send the entered command (data). Press 'Backspace' to delete the wrong entered character before you send the command. Press 'Up-Down' or 'Left-Right' to see and enter a 3 last sent commands. Press 'Esc' and then 'r' character to perform a hardware reset via RST pin. The second segment allows user to read and check response from the SIM868 module when the response is ready.

void application_task ( )
{
    rx_dat = UART_Rdy_Ptr( );

    if ( rx_dat )
    {
        rx_dat = UART_Rd_Ptr( );

        check_rx( );
    }
}

Additional Functions :

• _strcpy - Allows user to copy content of one string to second string, starting from the first place.
• _strcmp - Allows user to compare a content of two selected strings.
• prev_cmd - Checks the character (Up, Down, Left, Right, Esc) that was entered by the user side.
• check_prev_cmd - Determines which of 3 previous entered commands will be entered again.
• exe_cmd - Compares an entered command with the predefined commands and if any of these commands is matched, then executes a desired operation.
• add_cmd_line - Adds a new command line for entering new data/command/request.
• check_rx - Executes a received character parsering, entered from the user side.

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.