LBAND RTK click
LBAND RTK Click is a compact add-on board that provides global and easy access to satellite L-Band GNSS corrections. This board features the NEO-D9S-01A, an automotive-grade satellite data receiver for L-band correction broadcast from u-blox. Operating in a frequency range from 1550MHz to 1559MHz, the NEO-D9S-01A decodes the satellite transmission and outputs a correction stream, enabling a high-precision GNSS receiver to reach accuracies down to centimeter level. It can also select the GNSS correction data delivery channel alongside advanced security features such as signature and anti-jamming.
click Product page
Click library
- Author : Stefan Filipovic
- Date : Jan 2023.
- Type : UART/I2C/SPI type
Software Support
We provide a library for the LBAND RTK 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 LBAND RTK Click driver.
Standard key functions :
lbandrtk_cfg_setup
Config Object Initialization function.
lbandrtk_init
Initialization function.
Example key functions :
lbandrtk_set_default_pmp_cfg
This function sets the Point to multipoint (PMP) to default configuration to RAM layer.
lbandrtk_get_pmp_cfg
This function reads the Point to multipoint (PMP) configuration from RAM layer.
lbandrtk_read_ubx_frame
This function waits for an UBX frame message to arrive and reads it.
Example Description
This example demonstrates the use of LBAND RTK click by setting the Point to multipoint (PMP)
configuration and waiting for the UBX-RXM-PMP message, then parsing it and displaying on the USB UART.
The demo application is composed of two sections :
Application Init
Initializes the driver, reads the module version, sets the Point to multipoint (PMP) configuration
(for EU center frequency by default) and then reads that config and displays on the USB UART.
{
log_cfg_t log_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
Delay_ms ( 100 );
lbandrtk.frame.payload_len = 0;
{
log_printf( &logger, " ------ MODULE VERSION ------\r\n" );
log_printf( &logger, " SW version:\r\n %s\r\n\n", &lbandrtk.frame.payload[ 0 ] );
log_printf( &logger, " HW version:\r\n %s\r\n\n", &lbandrtk.frame.payload[ 30 ] );
log_printf( &logger, " Extension:\r\n" );
for ( uint16_t cnt = 0; cnt < ( ( lbandrtk.frame.payload_len - 40 ) / 30 ); cnt++ )
{
log_printf( &logger, " %s\r\n", &lbandrtk.frame.payload[ 40 + cnt * 30 ] );
}
log_printf( &logger, " ----------------------------\r\n\n" );
}
Delay_ms ( 100 );
{
log_error( &logger, " Set default PMP configuration." );
for ( ; ; );
}
{
log_printf( &logger, " ----- PMP CONFIGURATION ----\r\n" );
log_printf( &logger,
" Center frequency: %lu\r\n", pmp_cfg.
center_freq );
log_printf( &logger,
" Search window: %u\r\n", pmp_cfg.
search_window );
log_printf( &logger,
" Use service ID: %u\r\n", ( uint16_t ) pmp_cfg.
use_service_id );
log_printf( &logger,
" Service ID: %u\r\n", pmp_cfg.
service_id );
log_printf( &logger,
" Data rate: %u\r\n", pmp_cfg.
data_rate );
log_printf( &logger,
" Use descrambler: %u\r\n", ( uint16_t ) pmp_cfg.
use_descrambler );
log_printf( &logger,
" Use prescrambling: %lu\r\n", ( uint16_t ) pmp_cfg.
use_prescrambling );
log_printf( &logger, " ----------------------------\r\n\n" );
}
log_info( &logger, " Application Task " );
}
Application Task
Waits for an incoming UBX messages, reads and displays them on the USB UART. If the received message is
PMP data it will be parsed additionally.
{
{
{
log_printf( &logger, " -------- UBX-RXM-PMP -------\r\n" );
log_printf( &logger, " Version: %u\r\n", ( uint16_t ) lbandrtk.frame.payload[ 0 ] );
log_printf( &logger, " Time tag [ms]: %lu\r\n",
( ( uint32_t ) lbandrtk.frame.payload[ 7 ] << 24 ) | ( ( uint32_t ) lbandrtk.frame.payload[ 6 ] << 16 ) |
( ( uint16_t ) lbandrtk.frame.payload[ 5 ] << 8 ) | lbandrtk.frame.payload[ 4 ] );
log_printf( &logger, " Unique word: 0x%.8LX%.8LX\r\n",
( ( uint32_t ) lbandrtk.frame.payload[ 15 ] << 24 ) | ( ( uint32_t ) lbandrtk.frame.payload[ 14 ] << 16 ) |
( ( uint16_t ) lbandrtk.frame.payload[ 13 ] << 8 ) | lbandrtk.frame.payload[ 12 ],
( ( uint32_t ) lbandrtk.frame.payload[ 11 ] << 24 ) | ( ( uint32_t ) lbandrtk.frame.payload[ 10 ] << 16 ) |
( ( uint16_t ) lbandrtk.frame.payload[ 9 ] << 8 ) | lbandrtk.frame.payload[ 8 ] );
log_printf( &logger, " Unique word bit errors: %u\r\n", ( uint16_t ) lbandrtk.frame.payload[ 19 ] );
if ( lbandrtk.frame.payload[ 0 ] )
{
log_printf( &logger, " FEC bits : %u\r\n", ( ( uint16_t ) lbandrtk.frame.payload[ 21 ] << 8 ) | lbandrtk.frame.payload[ 20 ] );
}
else
{
log_printf( &logger, " FEC bits : %u\r\n", ( ( uint16_t ) lbandrtk.frame.payload[ 525 ] << 8 ) | lbandrtk.frame.payload[ 524 ] );
}
log_printf( &logger, "\r\n Service ID : %u\r\n", ( ( uint16_t ) lbandrtk.frame.payload[ 17 ] << 8 ) | lbandrtk.frame.payload[ 16 ] );
log_printf( &logger, " Spare byte: %u\r\n", ( uint16_t ) lbandrtk.frame.payload[ 18 ] );
if ( lbandrtk.frame.payload[ 0 ] )
{
num_bytes_user_data = ( ( uint16_t ) lbandrtk.frame.payload[ 3 ] << 8 ) | lbandrtk.frame.payload[ 2 ];
{
}
log_printf( &logger, " User data bytes: %u\r\n", num_bytes_user_data );
log_printf( &logger, " User data:\r\n" );
for ( uint16_t cnt = 0; cnt < num_bytes_user_data; cnt++ )
{
if ( 0 == ( cnt % 20 ) )
{
log_printf( &logger, "\r\n" );
}
log_printf( &logger, "%.2X ", ( uint16_t ) lbandrtk.frame.payload[ 24 + cnt ] );
}
}
else
{
log_printf( &logger, " User data bytes: %u\r\n", num_bytes_user_data );
log_printf( &logger, " User data:\r\n" );
for ( uint16_t cnt = 0; cnt < num_bytes_user_data; cnt++ )
{
if ( 0 == ( cnt % 20 ) )
{
log_printf( &logger, "\r\n" );
}
log_printf( &logger, " %.2X", ( uint16_t ) lbandrtk.frame.payload[ 20 + cnt ] );
}
}
log_printf( &logger, "\r\n ----------------------------\r\n\n" );
Delay_ms ( 100 );
}
else
{
log_printf( &logger, " ---- UBX FRAME RECEIVED ----\r\n" );
log_printf( &logger, " Class ID: 0x%.2X\r\n", ( uint16_t ) lbandrtk.frame.class_id );
log_printf( &logger, " Message ID: 0x%.2X\r\n", ( uint16_t ) lbandrtk.frame.msg_id );
log_printf( &logger, " Payload length: %u\r\n", lbandrtk.frame.payload_len );
log_printf( &logger, " Payload:" );
for ( uint16_t cnt = 0; cnt < lbandrtk.frame.payload_len; cnt++ )
{
if ( 0 == ( cnt % 20 ) )
{
log_printf( &logger, "\r\n" );
}
log_printf( &logger, " %.2X", ( uint16_t ) lbandrtk.frame.payload[ cnt ] );
}
log_printf( &logger, "\r\n ----------------------------\r\n\n" );
Delay_ms ( 100 );
}
}
}
Note
Make sure to use a correct L-Band antenna and that it's placed outside on open-sky in order to be able to receive PMP data from satellites.
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.LBANDRTK
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.