Library Description

The library covers all the necessary functions to control M-BUS click board. Library performs a standard UART interface communication.

Key functions:

• void mbus_write_byte ( uint8_t input ) - Write Single Byte.
• uint8_t mbus_read_byte( void ) - Read Single Byte.
• uint8_t mbus_byte_ready ( void ) - Check for new byte received.

Examples description

The application is composed of three sections :

• System Initialization - Initializes peripherals.
• Application Initialization - Initializes UART serial interface and app mode.
• Application Task - (code snippet) This is an example that demonstrates the use of the M-BUS Click board. In this example, depending on the app mode selected, we send ( receive ) a message to ( from ) the M-BUS Master Click which is connected via cable to M-BUS Click ( slave ). Results are being sent to the Usart Terminal where you can track their changes. All data logs write on USB uart changes approximately for every 2 sec.

void application_task ( )
{
    char tmp;
    uint8_t drdy_flag;

    if ( app_mode == APP_MODE_RECEIVER )
    {
        // RECEIVER - UART polling 

        drdy_flag = mbus_byte_ready( );

        if ( 1 == drdy_flag )
        {
            tmp = mbus_read_byte( );
            mikrobus_logWrite( &tmp, _LOG_BYTE );
        }
    }
    else
    {
        // TRANSMITER - TX each 2 sec
      
        for ( tmp = 0; tmp < 9; tmp++ )
        {
            mbus_write_byte( demo_message_data[ tmp ] );
            mikrobus_logWrite( " >> MESSAGE SENT <<", _LOG_LINE );
            Delay_ms( 100 );
        }
        
        Delay_ms( 2000 );
    }
}

Other mikroE Libraries used in the example:

• UART

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.