LR 14 Click

LR 14 Click is a compact add-on board for low-power, long-range wireless communication in IoT networks. This board features the RAK3172, a Class A/B/C LoRaWAN 1.0.3-compliant module from RAKwireless Technology, featuring the STM32WLE5CC ARM Cortex-M4 32-bit chip. This board supports LoRaWAN and LoRa Point-to-Point communication modes and integrates multiple frequency bands for flexibility across various regions. Key features include UART, SPI, and I2C interfaces, a USB Type-C connector for power and configuration, and a rechargeable battery option for standalone operation.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Jun 2024.
• Type : UART type

Software Support

We provide a library for the LR 14 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 14 Click driver.

Standard key functions :

• lr14_cfg_setup Config Object Initialization function.

  void lr14_cfg_setup ( lr14_cfg_t *cfg );

• lr14_init Initialization function.

  err_t lr14_init ( lr14_t *ctx, lr14_cfg_t *cfg );

Example key functions :

• lr14_cmd_run This function sends a specified command to the Click module.

  void lr14_cmd_run ( lr14_t *ctx, uint8_t *cmd );

• lr14_cmd_set This function sets a value to a specified command of the Click module.

  void lr14_cmd_set ( lr14_t *ctx, uint8_t *cmd, uint8_t *value );

• lr14_cmd_get This function is used to get the value of a given command from the Click module.

  void lr14_cmd_get ( lr14_t *ctx, uint8_t *cmd );

Example Description

This example demonstrates the use of LR 14 Click board by showing the communication between two Click boards configured in P2P network mode.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    lr14_cfg_t lr14_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.
    lr14_cfg_setup( &lr14_cfg );
    LR14_MAP_MIKROBUS( lr14_cfg, MIKROBUS_1 );
    if ( UART_ERROR == lr14_init( &lr14, &lr14_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );

    app_state = LR14_POWER_UP;
    log_printf( &logger, ">>> APP STATE - POWER UP <<<\r\n\n" );
}

Application Task

Application task is split in few stages:

• LR14_POWER_UP: Powers up the device, performs a device factory reset and reads system information.
• LR14_CONFIG_EXAMPLE: Configures device for the LoRa P2P network mode.
• LR14_EXAMPLE: Performs a LoRa P2P example by exchanging messages with another LR 14 Click board.

void application_task ( void )
{
    switch ( app_state )
    {
        case LR14_POWER_UP:
        {
            if ( LR14_OK == lr14_power_up( &lr14 ) )
            {
                app_state = LR14_CONFIG_EXAMPLE;
                log_printf( &logger, ">>> APP STATE - CONFIG EXAMPLE <<<\r\n\n" );
            }
            break;
        }
        case LR14_CONFIG_EXAMPLE:
        {
            if ( LR14_OK == lr14_config_example( &lr14 ) )
            {
                app_state = LR14_EXAMPLE;
                log_printf( &logger, ">>> APP STATE - EXAMPLE <<<\r\n\n" );
            }
            break;
        }
        case LR14_EXAMPLE:
        {
            lr14_example( &lr14 );
            break;
        }
        default:
        {
            log_error( &logger, " APP STATE." );
            break;
        }
    }
}

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.LR14

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.