M-BUS RF 3 Click

M-BUS RF 3 Click is a compact add-on board designed for utility metering and various telemetry applications. This board features the Metis-II (2607021183000), an 868MHz radio module from Würth Elektronik. It integrates an MSP430 microcontroller and a CC1125 RF chip-set to ensure efficient data transmission. Key features include a frequency range of 868.3MHz to 869.525MHz, support for the Wireless M-BUS EN13757-4:2013 and Open Metering System (OMS) standards, and communication capabilities up to 1000 meters in line-of-sight conditions. The board also offers energy-saving functionalities such as Wake-On-Radio, an output power of +14dBm output, and AES-128 encryption for secure communication.

Click Product page

Click library

• Author : Stefan Ilic
• Date : Jan 2024.
• Type : UART type

Software Support

We provide a library for the M-BUS RF 3 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 M-BUS RF 3 Click driver.

Standard key functions :

• mbusrf3_cfg_setup Config Object Initialization function.

  void mbusrf3_cfg_setup ( mbusrf3_cfg_t *cfg );

• mbusrf3_init Initialization function.

  err_t mbusrf3_init ( mbusrf3_t *ctx, mbusrf3_cfg_t *cfg );

• mbusrf3_default_cfg Click Default Configuration function.

  err_t mbusrf3_default_cfg ( mbusrf3_t *ctx );

Example key functions :

• mbusrf3_set_rst_pin This function is used to set reset pin state.

  void mbusrf3_set_rst_pin ( mbusrf3_t *ctx, uint8_t pin_state );

• mbusrf3_send_command This function is used to send a desired command.

  err_t mbusrf3_send_command ( mbusrf3_t *ctx, uint8_t cmd, uint8_t *data_in, uint8_t len );

• mbusrf3_send_data This function is used to data in transmitter mode.

  err_t mbusrf3_send_data ( mbusrf3_t *ctx, uint8_t *data_in, uint8_t len );

Example Description

This example demonstrates the use of M-BUS RF 3 Click board by processing the incoming data and displaying them on the USB UART.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs the Click configuration depending on selected DEMO_EXAMPLE macro.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    mbusrf3_cfg_t mbusrf3_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.
    mbusrf3_cfg_setup( &mbusrf3_cfg );
    MBUSRF3_MAP_MIKROBUS( mbusrf3_cfg, MIKROBUS_1 );
    if ( UART_ERROR == mbusrf3_init( &mbusrf3, &mbusrf3_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    mbusrf3_process( );
    mbusrf3_clear_app_buf( );
    Delay_ms ( 500 );

    mbusrf3_configure_for_example( );

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

Application Task

This example contains two examples depending on selected DEMO_EXAMPLE macro: EXAMPLE_TRANSMIT - Device is sending MESSAGE data to be read by receiver. EXAMPLE_RECEIVER - Device is reading transmitted message, and display it on USB UART terminal.

void application_task ( void ) 
{
    mbusrf3_example( );
}

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.MBUSRF3

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.