LR 6 Click

LR 6 Click is a compact add-on board designed for ultra-long-distance spread-spectrum communication. This board features the Ra-01S, a LoRa™ wireless radio frequency module from Ai-Thinker Technology, featuring the SX1268 radio chip. This module provides exceptional sensitivity of over -148dBm, a power output of +22dBm, and supports multiple modulation methods, including LoRa™, within the 433MHz frequency band. The board offers robust anti-interference capabilities and low power consumption, making it ideal for applications requiring reliable long-range communication.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Mar 2024.
• Type : SPI type

Software Support

We provide a library for the LR 6 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 6 Click driver.

Standard key functions :

• lr6_cfg_setup Config Object Initialization function.

  void lr6_cfg_setup ( lr6_cfg_t *cfg );

• lr6_init Initialization function.

  err_t lr6_init ( lr6_t *ctx, lr6_cfg_t *cfg );

• lr6_default_cfg Click Default Configuration function.

  err_t lr6_default_cfg ( lr6_t *ctx );

Example key functions :

• lr6_send_data This function sends a desired number of data bytes to the buffer by using the selected mode using the SPI serial interface.

  err_t lr6_send_data ( lr6_t *ctx, uint8_t *send_data, uint8_t len, uint8_t mode );

• lr6_receive_data This function receives a desired number of data bytes to the buffer by using the SPI serial interface.

  err_t lr6_receive_data ( lr6_t *ctx, uint8_t *receive_data, uint16_t buff_len, uint8_t *rx_len );

• lr6_set_lr_config This function performs the desired LoRa configuration by using the SPI serial interface.

  err_t lr6_set_lr_config ( lr6_t *ctx, lr6_lora_cfg_t lora_cfg );

Example Description

This example demonstrates the use of LR 6 Click board by processing the incoming data and displaying them on the USB UART.

The demo application is composed of two sections :

Application Init

Initialization of SPI module and log UART. After driver initialization, the app executes a default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    lr6_cfg_t lr6_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.
    lr6_cfg_setup( &lr6_cfg );
    LR6_MAP_MIKROBUS( lr6_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == lr6_init( &lr6, &lr6_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( LR6_ERROR == lr6_default_cfg ( &lr6 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
    log_printf( &logger, " --------------------\r\n" );
}

Application Task

The demo application is an echo example that sends a demo LoRa packet string and receives and processes all incoming data. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void )
{
    uint8_t rx_data[ 255 ] = { 0 };
    if ( LR6_OK == lr6_send_data( &lr6, LR6_DEMO_TEXT, strlen( LR6_DEMO_TEXT ), LR6_TX_MODE_SYNC ) ) 
    {
        log_info( &logger, " Send - success" );
        uint8_t rx_len = 0;
        do 
        {
            if ( LR6_OK == lr6_receive_data( &lr6, rx_data, strlen( LR6_DEMO_TEXT ), &rx_len ) )
            {
                if ( rx_len > 0 )
                { 
                    log_info( &logger, " Receive - success" );
                    log_printf( &logger, " > Receive: " );
                    for ( uint8_t cnt = 0; cnt < strlen( LR6_DEMO_TEXT ); cnt++ )
                    {
                        log_printf( &logger, "%c", rx_data[ cnt ] );
                    }

                    int8_t rssi, snr;
                    if ( LR6_OK == lr6_get_packet_status( &lr6, &rssi, &snr ) )
                    {
                        log_printf( &logger, " Rssi Pkt: %d dBm\r\n", ( int16_t ) rssi );
                        log_printf( &logger, " Snr Pkt : %d dB\r\n", ( int16_t ) snr );
                        log_printf( &logger, " --------------------\r\n" );
                        break;
                    }
                }
            }
        } 
        while ( rx_len == 0 );
    }
    else
    {
        log_info( &logger, "Send - fail" );
    }
    Delay_ms ( 1000 );
}

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.LR6

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.