LR Click

LR Click is a compact add-on board that contains a low-power, long-range transceiver. This board features the RN2483, RF technology-based SRD transceiver, which operates at a frequency of 433/868MHz from Microchip Technology. This Click board™ features an embedded LoRaWAN Class A compliant stack, providing a long-range spread spectrum communication with high interference immunity. The RN2483 module is a fully certified 433/868MHz European R&TTE directive assessed radio modem combined with the advanced and straightforward command interface.

Click Product page

Click library

• Author : Stefan Ilic
• Date : Feb 2023.
• Type : UART type

Software Support

We provide a library for the LR 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 LR Click driver.

Standard key functions :

• lr_cfg_setup Config Object Initialization function.

  void lr_cfg_setup ( lr_cfg_t *cfg );

• lr_init Initialization function.

  err_t lr_init ( lr_t *ctx, lr_cfg_t *cfg );

• lr_default_cfg Click Default Configuration function.

  void lr_default_cfg ( lr_t *ctx, bool cb_default, void ( *response_p )( char *response ) );

Example key functions :

• lr_mac_tx Function for writing mac parameters

  uint8_t lr_mac_tx ( lr_t *ctx, lr_mac_t *mac );

• lr_join Function for setting join mode

  uint8_t lr_join ( lr_t *ctx, char *join_mode, char *response );

• lr_tick_conf Timer Configuration

  void lr_tick_conf ( lr_t *ctx, uint32_t timer_limit );

Example Description

This example shows the usage of the LR Click board by transmitting and receiving data.

The demo application is composed of two sections :

Application Init

IInitializes the driver and performs default configuration and reads System version.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    lr_cfg_t lr_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.
    lr_cfg_setup( &lr_cfg );
    LR_MAP_MIKROBUS( lr_cfg, MIKROBUS_1 );
    if ( UART_ERROR == lr_init( &lr, &lr_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    lr_default_cfg( &lr, 0, 0 );

    lr_cmd( &lr, LR_CMD_SYS_GET_VER, resp_buf );
    log_printf( &logger, "System VER: %s \r\n", resp_buf );

    lr_cmd( &lr, LR_CMD_MAC_PAUSE, resp_buf );
    log_printf( &logger, "MAC PAUSE: %s \r\n", resp_buf );

    lr_cmd( &lr, LR_CMD_RADIO_SET_WDT, resp_buf );
    log_printf( &logger, "RADIO SET WDT 0: %s \r\n", resp_buf );

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

Application Task

Transmitter mode - sends one-by-one byte sequence of the desired message each second and checks if it is sent successfully Receiver mode - displays all the received characters on USB UART.

void application_task ( void ) 
{
    lr_process( );

#ifdef DEMO_APP_RECEIVER
    char *ptr;
    uint8_t int_data;
    if ( LR_OK == lr_rx( &lr, LR_ARG_0, resp_buf ) ) 
    {
        resp_buf[ 12 ] = 0;
        ptr = ( char* ) &int_data;
        hex_to_int( &resp_buf[ 10 ], ptr );
        log_printf( &logger, "%c", int_data  );
    }
#endif
#ifdef DEMO_APP_TRANSMITTER
    for ( uint8_t cnt = 0; cnt < 9; cnt++ ) 
    {
        int8_to_hex( send_message[ cnt ], send_hex );
        if ( LR_OK == lr_tx( &lr, &send_hex[ 0 ] ) ) 
        {
            log_printf( &logger, " Response : %s \r\n", resp_buf );
        }
        Delay_ms ( 1000 );
    }
#endif
}

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.LR

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.