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GNSS 12 Click with UNI-DS v8

Published Sep 02, 2023

Click board™

GNSS 12 Click

Development board

UNI-DS v8

Compiler

NECTO Studio

MCU

STM32F405ZG

Our GNSS breakthrough not only helps you find your way but also ensures that every experience along the journey is extraordinary

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Hardware Overview

How does it work?

GNSS 12 Click is based on the CAM-M8C, a concurrent GNSS chip antenna module from u-blox. The CAM-M8C is built on the high-performing M8 GNSS engine and utilizes simultaneous reception of up to three GNSS systems (GPS/Galileo together with BeiDou or GLONASS). It offers high sensitivity and minimal acquisition times while maintaining low power consumption and provides outstanding positioning accuracy even in GNSS-hostile environments. It also supports message integrity protection, geofencing, and spoofing detection with configurable interface settings to easily fit applications, such as industrial and automotive. The CAM-M8C communicates with the host MCU using the UART interface at 115200bps as its default communication protocol but also has other interfaces, such as SPI and I2C. The interface is selected by positioning SMD jumpers labeled COMM SEL in an appropriate position. Note that all

the jumpers' positions must be on the same side, or the Click board™ may become unresponsive. In addition, this board also uses several mikroBUS™ pins. The reset pin routed on the RST pin of the mikroBUS™ socket provides the general reset ability, while the INT pin of the mikroBUS™ socket represents an external interrupt. An interrupt feature can be used for wake-up functions in the power save mode and aiding. In the case of the primary supply failure, this Click board™ can use a backup supply voltage from a connected battery to help the internal RTC to run still, providing a timing reference for the receiver. Backup voltage also supplies battery-backed RAM, saving all relevant data in the backup RAM to allow a hot or warm start later. If the backup battery is disconnected, the module performs a cold start during a Power-Up sequence. In addition to precise positioning, the GNSS 12 Click also has an accurate timing signal indicated through an

orange LED indicator marked as PPS. Besides an integrated omnidirectional GNSS chip antenna, the GNSS 12 Click possesses the N.FL antenna connector for connecting the appropriate active antenna offered by Mikroe for improved range and received signal strength. Thanks to the LNA pin, routed to the PWM pin of the mikroBUS™ socket, it is possible to control the use of the external antenna through the MAX40200, and thus the power consumption in the power save mode. Also, for the simplest possible implementation of SMA antennas on these types of connectors, the MMCX-SMA Cable from our offer is recommended. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

GNSS 12 Click hardware overview image

Features overview

Development board

UNI-DS v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different STM32, Kinetis, TIVA, CEC, MSP, PIC, dsPIC, PIC32, and AVR MCUs regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over WiFi. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, UNI-DS v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the UNI-DS v8 development board contains the components necessary for the most efficient operation of the same board. An advanced integrated CODEGRIP programmer/debugger module offers many valuable programming/debugging options, including support for JTAG, SWD, and SWO Trace (Single Wire Output)), and seamless integration with the Mikroe software environment. Besides, it also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector. Communication options such as USB-UART, USB

HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet is also included. In addition, it also has the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options for the TFT board line of products and character-based LCD. UNI-DS v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

UNI-DS v8 horizontal image

Microcontroller Overview

MCU Card / MCU

default

Type

8th Generation

Architecture

ARM Cortex-M4

MCU Memory (KB)

1024

Silicon Vendor

STMicroelectronics

Pin count

144

RAM (Bytes)

196608

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
Reset
PE11
RST
SPI Chip Select
PA4
CS
SPI Clock
PA5
SCK
SPI Data OUT
PA6
MISO
SPI Data IN
PB5
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
External Antenna Activation
PD12
PWM
Interrupt
PD3
INT
UART TX
PB6
TX
UART RX
PB7
RX
I2C Clock
PB8
SCL
I2C Data
PB9
SDA
NC
NC
5V
Ground
GND
GND
1

Take a closer look

Schematic

GNSS 12 Click Schematic schematic

Step by step

Project assembly

Fusion for PIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the UNI-DS v8 as your development board.

Fusion for PIC v8 front image hardware assembly
Buck 22 Click front image hardware assembly
SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly
v8 SiBRAIN MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto image step 7 hardware assembly
Necto image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

Software Support

Library Description

This library contains API for GNSS 12 Click driver.

Key functions:

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

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

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

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

/*!
 * @file main.c
 * @brief GNSS12 Click 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.
 *
 * ## 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.
 *
 * ## Additional Function
 * - static void gnss12_clear_app_buf ( void )
 * - static err_t gnss12_process ( gnss12_t *ctx )
 * - static void gnss12_parser_application ( char *rsp )
 *
 * @author Stefan Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "gnss12.h"

#define PROCESS_BUFFER_SIZE 200

static gnss12_t gnss12;
static log_t logger;

static char app_buf[ PROCESS_BUFFER_SIZE ] = { 0 };
static int32_t app_buf_len = 0;
static int32_t app_buf_cnt = 0;

/**
 * @brief GNSS 12 clearing application buffer.
 * @details This function clears memory of application buffer and reset its length and counter.
 * @return None.
 * @note None.
 */
static void gnss12_clear_app_buf ( void );

/**
 * @brief GNSS 12 data reading function.
 * @details This function reads data from device and concatenates data to application buffer.
 * @param[in] ctx : Click context object.
 * See #gnss12_t object definition for detailed explanation.
 * @return @li @c  0 - Read some data.
 *         @li @c -1 - Nothing is read or Application buffer overflow.
 * See #err_t definition for detailed explanation.
 * @note None.
 */
static err_t gnss12_process ( gnss12_t *ctx );

/**
 * @brief GNSS 12 parser application.
 * @param[in] rsp Response buffer.
 * @details This function logs GNSS data on the USB UART.
 * @return None.
 * @note None.
 */
static void gnss12_parser_application ( char *rsp );

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 " );
}

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

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}

static void gnss12_clear_app_buf ( void ) 
{
    memset( app_buf, 0, app_buf_len );
    app_buf_len = 0;
    app_buf_cnt = 0;
}

static err_t gnss12_process ( gnss12_t *ctx ) 
{
    int32_t rx_size = 0;
    char rx_buf[ PROCESS_BUFFER_SIZE ] = { 0 };
    if ( GNSS12_DRV_SEL_UART == ctx->drv_sel )
    {
        rx_size = gnss12_generic_read( ctx, rx_buf, PROCESS_BUFFER_SIZE );
    }
    else if ( ( GNSS12_DRV_SEL_I2C == ctx->drv_sel ) || ( GNSS12_DRV_SEL_SPI == ctx->drv_sel ) )
    {
        if ( GNSS12_OK == gnss12_generic_read( ctx, rx_buf, 1 ) )
        {
            if ( GNSS12_DUMMY != rx_buf[ 0 ] )
            {
                rx_size = 1;
            }
        }
    }
    if ( rx_size > 0 ) 
    {
        int32_t buf_cnt = 0;
        if ( ( app_buf_len + rx_size ) > PROCESS_BUFFER_SIZE ) 
        {
            gnss12_clear_app_buf(  );
            return GNSS12_ERROR;
        } 
        else 
        {
            buf_cnt = app_buf_len;
            app_buf_len += rx_size;
        }
        for ( int32_t rx_cnt = 0; rx_cnt < rx_size; rx_cnt++ ) 
        {
            if ( rx_buf[ rx_cnt ] ) 
            {
                app_buf[ ( buf_cnt + rx_cnt ) ] = rx_buf[ rx_cnt ];
            }
            else
            {
                app_buf_len--;
                buf_cnt--;
            }
        }
        return GNSS12_OK;
    }
    return GNSS12_ERROR;
}

static void gnss12_parser_application ( char *rsp )
{
    char element_buf[ 100 ] = { 0 };
    if ( GNSS12_OK == gnss12_parse_gngga( rsp, GNSS12_GNGGA_LATITUDE, element_buf ) )
    {
        static uint8_t wait_for_fix_cnt = 0;
        if ( strlen( element_buf ) > 0 )
        {
            log_printf( &logger, "\r\n Latitude: %.2s degrees, %s minutes \r\n", element_buf, &element_buf[ 2 ] );
            gnss12_parse_gngga( rsp, GNSS12_GNGGA_LONGITUDE, element_buf );
            log_printf( &logger, " Longitude: %.3s degrees, %s minutes \r\n", element_buf, &element_buf[ 3 ] );
            memset( element_buf, 0, sizeof( element_buf ) );
            gnss12_parse_gngga( rsp, GNSS12_GNGGA_ALTITUDE, element_buf );
            log_printf( &logger, " Altitude: %s m \r\n", element_buf );
            wait_for_fix_cnt = 0;
        }
        else
        {
            if ( wait_for_fix_cnt % 5 == 0 )
            {
                log_printf( &logger, " Waiting for the position fix...\r\n\n" );
                wait_for_fix_cnt = 0;
            }
            wait_for_fix_cnt++;
        }
        gnss12_clear_app_buf(  );
    }
}

// ------------------------------------------------------------------------ END

Additional Support

Resources