gnss  2.0.0.0
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GNSS click

GNSS click carries Quectel’s L86 GNSS module with a patch antenna along with an external antenna connector.

click Product page


Click library

  • Author : Stefan Filipovic
  • Date : Jul 2022.
  • Type : UART type

Software Support

We provide a library for the GNSS 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 Click driver.

Standard key functions :

Example key functions :

  • gnss_generic_read This function reads a desired number of data bytes by using UART serial interface.
    err_t gnss_generic_read ( gnss_t *ctx, char *data_out, uint16_t len );
  • gnss_clear_ring_buffers This function clears UART tx and rx ring buffers.
  • gnss_parse_gpgga This function parses the GPGGA data from the read response buffer.
    err_t gnss_parse_gpgga ( char *rsp_buf, uint8_t gpgga_element, char *element_data );

Example Description

This example demonstrates the use of GNSS click by reading and displaying the GPS coordinates.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger.

void application_init ( void )
{
log_cfg_t log_cfg;
gnss_cfg_t gnss_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
gnss_cfg_setup( &gnss_cfg );
GNSS_MAP_MIKROBUS( gnss_cfg, MIKROBUS_1 );
if ( UART_ERROR == gnss_init( &gnss, &gnss_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}

Application Task

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

void application_task ( void )
{
if ( GNSS_OK == gnss_process( &gnss ) )
{
if ( PROCESS_BUFFER_SIZE == app_buf_len )
{
gnss_parser_application( &gnss, 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.GNSS

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.


gnss_init
err_t gnss_init(gnss_t *ctx, gnss_cfg_t *cfg)
GNSS initialization function.
gnss_generic_read
err_t gnss_generic_read(gnss_t *ctx, char *data_out, uint16_t len)
GNSS data reading function.
gnss_t
GNSS Click context object.
Definition: gnss.h:122
GNSS_MAP_MIKROBUS
#define GNSS_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: gnss.h:108
application_task
void application_task(void)
Definition: main.c:101
PROCESS_BUFFER_SIZE
#define PROCESS_BUFFER_SIZE
Definition: main.c:32
gnss_cfg_t
GNSS Click configuration object.
Definition: gnss.h:141
gnss_clear_ring_buffers
void gnss_clear_ring_buffers(gnss_t *ctx)
GNSS clear ring buffers function.
gnss_parse_gpgga
err_t gnss_parse_gpgga(char *rsp_buf, uint8_t gpgga_element, char *element_data)
GNSS parse GPGGA function.
application_init
void application_init(void)
Definition: main.c:72
GNSS_OK
@ GNSS_OK
Definition: gnss.h:165
gnss_cfg_setup
void gnss_cfg_setup(gnss_cfg_t *cfg)
GNSS configuration object setup function.