GNSS 12 Click

GNSS 12 Click is a compact add-on board that provides fast positioning capability. This board features the CAM-M8C, a professional-grade GNSS module built on the high-performing M8 GNSS engine from u-blox. This module utilizes concurrent reception of up to three GNSS systems (GPS/Galileo together with either BeiDou or GLONASS), offering high sensitivity and strong signal levels. Besides internal, the CAM-M8C can use an optional external active antenna. It has a configurable host interface, advanced jamming/spoofing detection, and provides outstanding positioning accuracy even in GNSS-hostile environments.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Dec 2022.
• Type : UART/I2C/SPI type

Software Support

We provide a library for the GNSS 12 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 GNSS 12 Click driver.

Standard key functions :

• gnss12_cfg_setup Config Object Initialization function.

  void gnss12_cfg_setup ( gnss12_cfg_t *cfg );

• gnss12_init Initialization function.

  err_t gnss12_init ( gnss12_t *ctx, gnss12_cfg_t *cfg );

Example key functions :

• gnss12_reset_device This function resets the device by toggling the RST pin.

  void gnss12_reset_device ( gnss12_t *ctx );

• gnss12_generic_read This function reads a desired number of data bytes from the module.

  err_t gnss12_generic_read ( gnss12_t *ctx, uint8_t *data_out, uint8_t len );

• gnss12_parse_gngga This function parses the GNGGA data from the read response buffer.

  err_t gnss12_parse_gngga ( char *rsp_buf, uint8_t gngga_element, char *element_data );

Example Description

This example demonstrates the use of GNSS 12 Click by reading and displaying the GNSS coordinates.

The demo application is composed of two sections :

Application Init

Initializes the driver and resets the Click board.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    gnss12_cfg_t gnss12_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.
    gnss12_cfg_setup( &gnss12_cfg );
    GNSS12_MAP_MIKROBUS( gnss12_cfg, MIKROBUS_1 );
    err_t init_flag = gnss12_init( &gnss12, &gnss12_cfg );
    if ( ( UART_ERROR == init_flag ) || ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    gnss12_reset_device ( &gnss12 );
    log_info( &logger, " Application Task " );
}

Application Task

Reads the received data, parses the GNGGA info from it, and once it receives the position fix it will start displaying the coordinates on the USB UART.

void application_task ( void )
{
    gnss12_process( &gnss12 );
    if ( app_buf_len > ( sizeof ( GNSS12_RSP_GNGGA ) + GNSS12_GNGGA_ELEMENT_SIZE ) ) 
    {
        gnss12_parser_application( app_buf );
    }
}

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.GNSS12

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.