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465527a980
WMM are not currenly implemented.
744 lines
20 KiB
C
744 lines
20 KiB
C
/**
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******************************************************************************
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* @addtogroup OpenPilotModules OpenPilot Modules
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* @{
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* @addtogroup GSPModule GPS Module
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* @brief Process GPS information
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* @{
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*
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* @file NMEA.c
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* @brief GPS module, handles GPS and NMEA stream
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "pios.h"
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// This should really be wrapped into a target specific include
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#include "ahrs_spi_comm.h"
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//#include "gpsposition.h"
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//#include "gpstime.h"
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//#include "gpssatellites.h"
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#include "NMEA.h"
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// Debugging
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#ifdef ENABLE_DEBUG_MSG
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//#define DEBUG_MSG_IN ///< define to display the incoming NMEA messages
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//#define DEBUG_PARS ///< define to display the incoming NMEA messages split into its parameters
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//#define DEBUG_MGSID_IN ///< define to display the the names of the incoming NMEA messages
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//#define NMEA_DEBUG_PKT ///< define to enable debug of all NMEA messages
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//#define NMEA_DEBUG_GGA ///< define to enable debug of GGA messages
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//#define NMEA_DEBUG_VTG ///< define to enable debug of VTG messages
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//#define NMEA_DEBUG_RMC ///< define to enable debug of RMC messages
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//#define NMEA_DEBUG_GSA ///< define to enable debug of GSA messages
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//#define NMEA_DEBUG_GSV ///< define to enable debug of GSV messages
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//#define NMEA_DEBUG_ZDA ///< define to enable debug of ZDA messages
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//#define NMEA_DEBUG_PGTOP ///< define to enable debug of PGTOP messages
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#define DEBUG_MSG(format, ...) PIOS_COM_SendFormattedString(DEBUG_PORT, format, ## __VA_ARGS__)
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#else
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#define DEBUG_MSG(format, ...)
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#endif
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#define MAX_NB_PARAMS 20
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/* NMEA sentence parsers */
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struct nmea_parser {
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const char *prefix;
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bool(*handler) (GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam);
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uint32_t cnt;
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};
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static bool nmeaProcessGPGGA(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam);
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static bool nmeaProcessGPRMC(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam);
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static bool nmeaProcessGPVTG(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam);
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static bool nmeaProcessGPGSA(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam);
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static bool nmeaProcessGPZDA(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam);
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static bool nmeaProcessGPGSV(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam);
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static bool nmeaProcessPGTOP(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam);
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static struct nmea_parser nmea_parsers[] = {
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{
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.prefix = "GPGGA",
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.handler = nmeaProcessGPGGA,
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.cnt = 0,
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},
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{
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.prefix = "GPVTG",
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.handler = nmeaProcessGPVTG,
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.cnt = 0,
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},
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{
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.prefix = "GPGSA",
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.handler = nmeaProcessGPGSA,
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.cnt = 0,
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},
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{
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.prefix = "GPRMC",
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.handler = nmeaProcessGPRMC,
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.cnt = 0,
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},
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{
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.prefix = "GPZDA",
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.handler = nmeaProcessGPZDA,
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.cnt = 0,
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},
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{
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.prefix = "GPGSV",
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.handler = nmeaProcessGPGSV,
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.cnt = 0,
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},
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{
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.prefix = "PGTOP",
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.handler = nmeaProcessPGTOP,
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.cnt = 0,
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},
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};
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static struct nmea_parser *NMEA_find_parser_by_prefix(const char *prefix)
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{
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if (!prefix) {
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return (NULL);
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}
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for (uint8_t i = 0; i < NELEMENTS(nmea_parsers); i++) {
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struct nmea_parser *parser = &nmea_parsers[i];
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/* Use strcmp to check for exact equality over the entire prefix */
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if (!strcmp(prefix, parser->prefix)) {
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/* Found an appropriate parser */
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return (parser);
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}
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}
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/* No matching parser for this prefix */
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return (NULL);
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}
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/**
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* Computes NMEA sentence checksum
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* \param[in] Buffer for parsed nmea sentence
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* \return false checksum not valid
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* \return true checksum valid
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*/
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bool NMEA_checksum(char *nmea_sentence)
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{
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uint8_t checksum_computed = 0;
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uint8_t checksum_received;
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while (*nmea_sentence != '\0' && *nmea_sentence != '*') {
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checksum_computed ^= *nmea_sentence;
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nmea_sentence++;
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}
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/* Make sure we're now pointing at the checksum */
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if (*nmea_sentence == '\0') {
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/* Buffer ran out before we found a checksum marker */
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return false;
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}
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/* Load the checksum from the buffer */
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checksum_received = strtol(nmea_sentence + 1, NULL, 16);
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//PIOS_COM_SendFormattedStringNonBlocking(COM_DEBUG_USART,"$%d=%d\r\n",checksum_received,checksum_computed);
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return (checksum_computed == checksum_received);
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}
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/*
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* This function only exists to deal with a linking
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* failure in the stdlib function strtof(). This
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* implementation does not rely on the _sbrk() syscall
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* like strtof() does.
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*/
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/* Parse a number encoded in a string of the format:
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* [-]NN.nnnnn
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* into a signed whole part and an unsigned fractional part.
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* The fract_units field indicates the units of the fractional part as
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* 1 whole = 10^fract_units fract
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*/
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static bool NMEA_parse_real(int32_t * whole, uint32_t * fract, uint8_t * fract_units, char *field)
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{
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char *s = field;
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char *field_w;
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char *field_f;
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PIOS_DEBUG_Assert(whole);
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PIOS_DEBUG_Assert(fract);
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PIOS_DEBUG_Assert(fract_units);
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field_w = strsep(&s, ".");
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field_f = s;
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*whole = strtol(field_w, NULL, 10);
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if (field_w) {
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/* decimal was found so we may have a fractional part */
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*fract = strtoul(field_f, NULL, 10);
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*fract_units = strlen(field_f);
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} else {
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/* no decimal was found, fractional part is zero */
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*fract = 0;
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*fract_units = 0;
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}
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return true;
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}
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static float NMEA_real_to_float(char *nmea_real)
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{
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int32_t whole;
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uint32_t fract;
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uint8_t fract_units;
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/* Sanity checks */
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PIOS_DEBUG_Assert(nmea_real);
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if (!NMEA_parse_real(&whole, &fract, &fract_units, nmea_real)) {
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return false;
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}
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/* Convert to float */
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return (((float)whole) + fract * pow(10, -fract_units));
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}
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/*
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* Parse a field in the format:
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* DD[D]MM.mmmm[mm]
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* into a fixed-point representation in units of (degrees * 1e-7)
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*/
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static bool NMEA_latlon_to_fixed_point(int32_t * latlon, char *nmea_latlon, bool negative)
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{
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int32_t num_DDDMM;
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uint32_t num_m;
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uint8_t units;
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/* Sanity checks */
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PIOS_DEBUG_Assert(nmea_latlon);
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PIOS_DEBUG_Assert(latlon);
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if (!NMEA_parse_real(&num_DDDMM, &num_m, &units, nmea_latlon)) {
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return false;
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}
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/* scale up the mmmm[mm] field apropriately depending on # of digits */
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switch (units) {
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case 0:
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/* no digits, value is zero so no scaling */
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break;
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case 1: /* m */
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num_m *= 1e6; /* m000000 */
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break;
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case 2: /* mm */
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num_m *= 1e5; /* mm00000 */
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break;
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case 3: /* mmm */
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num_m *= 1e4; /* mmm0000 */
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break;
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case 4: /* mmmm */
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num_m *= 1e3; /* mmmm000 */
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break;
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case 5: /* mmmmm */
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num_m *= 1e2; /* mmmmm00 */
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break;
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case 6: /* mmmmmm */
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num_m *= 1e1; /* mmmmmm0 */
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break;
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default:
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/* unhandled format */
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num_m = 0;
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break;
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}
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*latlon = (num_DDDMM / 100) * 1e7; /* scale the whole degrees */
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*latlon += (num_DDDMM % 100) * 1e7 / 60; /* add in the scaled decimal whole minutes */
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*latlon += num_m / 60; /* add in the scaled decimal fractional minutes */
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if (negative)
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*latlon *= -1;
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return true;
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}
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/**
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* Parses a complete NMEA sentence and updates the GPSPosition UAVObject
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* \param[in] An NMEA sentence with a valid checksum
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* \return true if the sentence was successfully parsed
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* \return false if any errors were encountered with the parsing
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*/
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bool NMEA_update_position(char *nmea_sentence)
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{
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char* p = nmea_sentence;
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char* params[MAX_NB_PARAMS];
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uint8_t nbParams;
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#ifdef DEBUG_MSG_IN
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DEBUG_MSG("\"%s\"\n", nmea_sentence);
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#endif
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// Split the nmea sentence it its parameters, separated by ","
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// Sample NMEA message: "GPRMC,000131.736,V,,,,,0.00,0.00,060180,,,N*43"
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// The first parameter starts at the beginning of the message
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params[0] = p;
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nbParams = 1;
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while (*p != 0) {
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if (*p == '*') {
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// After the * comes the "CRC", we are done,
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*p = 0; // Zero-terminate this parameter
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break;
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} else if (*p == ',') {
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// This is the end of this parameter
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*p = 0; // Zero-terminate this parameter
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// Start new parameter
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if (nbParams==MAX_NB_PARAMS)
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break;
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params[nbParams] = p+1; // For sure there is something at p+1 because at p there is ","
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nbParams++;
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}
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p++;
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}
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#ifdef DEBUG_PARAMS
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int i;
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for (i=0;i<nbParams; i++) {
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DEBUG_MSG(" %d \"%s\"\n", i, params[i]);
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}
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#endif
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// The first parameter is the message name, lets see if we find a parser for it
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struct nmea_parser *parser;
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parser = NMEA_find_parser_by_prefix(params[0]);
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if (!parser) {
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// No parser found
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DEBUG_MSG(" NO PARSER (\"%s\")\n", params[0]);
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return false;
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}
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parser->cnt++;
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#ifdef DEBUG_MGSID_IN
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DEBUG_MSG("%s %d ", params[0], parser->cnt);
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#endif
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// Send the message to then parser and get it update the GpsData
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GPSPositionData GpsData;
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GPSPositionGet(&GpsData);
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bool gpsDataUpdated;
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if (!parser->handler(&GpsData, &gpsDataUpdated, params, nbParams)) {
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// Parse failed
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DEBUG_MSG("PARSE FAILED (\"%s\")\n", params[0]);
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return false;
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}
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// All is fine :) Update object if data has changed
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if (gpsDataUpdated) {
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#ifdef DEBUG_MGSID_IN
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DEBUG_MSG("U");
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#endif
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GPSPositionSet(&GpsData);
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}
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#ifdef DEBUG_MGSID_IN
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DEBUG_MSG("\n");
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#endif
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return true;
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}
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/**
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* Parse an NMEA GPGGA sentence and update the given UAVObject
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* \param[in] A pointer to a GPSPosition UAVObject to be updated.
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* \param[in] An NMEA sentence with a valid checksum
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*/
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static bool nmeaProcessGPGGA(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam)
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{
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if (nbParam != 15)
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return false;
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#ifdef NMEA_DEBUG_GGA
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DEBUG_MSG("\n UTC=%s\n", param[1]);
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DEBUG_MSG(" Lat=%s %s\n", param[2], param[3]);
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DEBUG_MSG(" Long=%s %s\n", param[4], param[5]);
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DEBUG_MSG(" Fix=%s\n", param[6]);
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DEBUG_MSG(" Sat=%s\n", param[7]);
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DEBUG_MSG(" HDOP=%s\n", param[8]);
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DEBUG_MSG(" Alt=%s %s\n", param[9], param[10]);
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DEBUG_MSG(" GeoidSep=%s %s\n\n", param[11]);
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#endif
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*gpsDataUpdated = true;
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// get latitude [DDMM.mmmmm] [N|S]
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if (!NMEA_latlon_to_fixed_point(&GpsData->Latitude, param[2], param[3][0] == 'S')) {
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return false;
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}
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// get longitude [dddmm.mmmmm] [E|W]
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if (!NMEA_latlon_to_fixed_point(&GpsData->Longitude, param[4], param[5][0] == 'W')) {
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return false;
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}
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// get number of satellites used in GPS solution
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GpsData->Satellites = atoi(param[7]);
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// get altitude (in meters mm.m)
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GpsData->Altitude = NMEA_real_to_float(param[9]);
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// geoid separation
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GpsData->GeoidSeparation = NMEA_real_to_float(param[11]);
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return true;
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}
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/**
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* Parse an NMEA GPRMC sentence and update the given UAVObject
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* \param[in] A pointer to a GPSPosition UAVObject to be updated.
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* \param[in] An NMEA sentence with a valid checksum
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*/
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static bool nmeaProcessGPRMC(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam)
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{
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if (nbParam != 13)
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return false;
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#ifdef NMEA_DEBUG_RMC
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DEBUG_MSG("\n UTC=%s\n", param[1]);
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DEBUG_MSG(" Lat=%s %s\n", param[3], param[4]);
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DEBUG_MSG(" Long=%s %s\n", param[5], param[6]);
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DEBUG_MSG(" Speed=%s\n", param[7]);
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DEBUG_MSG(" Course=%s\n", param[8]);
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DEBUG_MSG(" DateOfFix=%s\n\n", param[9]);
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#endif
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*gpsDataUpdated = true;
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GPSTimeData gpst;
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GPSTimeGet(&gpst);
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// get UTC time [hhmmss.sss]
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float hms = NMEA_real_to_float(param[1]);
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gpst.Second = (int)hms % 100;
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gpst.Minute = (((int)hms - gpst.Second) / 100) % 100;
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gpst.Hour = (int)hms / 10000;
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// get latitude [DDMM.mmmmm] [N|S]
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if (!NMEA_latlon_to_fixed_point(&GpsData->Latitude, param[3], param[4][0] == 'S')) {
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return false;
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}
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// get longitude [dddmm.mmmmm] [E|W]
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if (!NMEA_latlon_to_fixed_point(&GpsData->Longitude, param[5], param[6][0] == 'W')) {
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return false;
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}
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// get speed in knots
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GpsData->Groundspeed = NMEA_real_to_float(param[7]) * 0.51444; // to m/s
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// get True course
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GpsData->Heading = NMEA_real_to_float(param[8]);
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// get Date of fix
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// TODO: Should really not use a float here to be safe
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float date = NMEA_real_to_float(param[9]);
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gpst.Year = (int)date % 100;
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gpst.Month = (((int)date - gpst.Year) / 100) % 100;
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gpst.Day = (int)(date / 10000);
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gpst.Year += 2000;
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GPSTimeSet(&gpst);
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return true;
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}
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/**
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* Parse an NMEA GPVTG sentence and update the given UAVObject
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* \param[in] A pointer to a GPSPosition UAVObject to be updated.
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* \param[in] An NMEA sentence with a valid checksum
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*/
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static bool nmeaProcessGPVTG(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam)
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{
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if (nbParam != 9 && nbParam != 10 /*GTOP GPS seems to gemnerate an extra parameter...*/)
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return false;
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#ifdef NMEA_DEBUG_RMC
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DEBUG_MSG("\n Heading=%s %s\n", param[1], param[2]);
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DEBUG_MSG(" GroundSpeed=%s %s\n", param[5], param[6]);
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#endif
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*gpsDataUpdated = true;
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GpsData->Heading = NMEA_real_to_float(param[1]);
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GpsData->Groundspeed = NMEA_real_to_float(param[5]) * 0.51444; // to m/s
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|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Parse an NMEA GPZDA sentence and update the @ref GPSTime object
|
|
* \param[in] A pointer to a GPSPosition UAVObject to be updated (unused).
|
|
* \param[in] An NMEA sentence with a valid checksum
|
|
*/
|
|
static bool nmeaProcessGPZDA(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam)
|
|
{
|
|
if (nbParam != 7)
|
|
return false;
|
|
|
|
#ifdef NMEA_DEBUG_ZDA
|
|
DEBUG_MSG("\n Time=%s (hhmmss.ss)\n", param[1]);
|
|
DEBUG_MSG(" Date=%s/%s/%s (d/m/y)\n", param[2], param[3], param[4]);
|
|
#endif
|
|
|
|
*gpsDataUpdated = false; // Here we will never provide a new GPS value
|
|
|
|
// No new data data extracted
|
|
GPSTimeData gpst;
|
|
GPSTimeGet(&gpst);
|
|
|
|
// get UTC time [hhmmss.sss]
|
|
float hms = NMEA_real_to_float(param[1]);
|
|
gpst.Second = (int)hms % 100;
|
|
gpst.Minute = (((int)hms - gpst.Second) / 100) % 100;
|
|
gpst.Hour = (int)hms / 10000;
|
|
|
|
// Get Date
|
|
gpst.Day = atoi(param[2]);
|
|
gpst.Month = atoi(param[3]);
|
|
gpst.Year = atoi(param[4]);
|
|
|
|
GPSTimeSet(&gpst);
|
|
return true;
|
|
}
|
|
|
|
static GPSSatellitesData gsv_partial;
|
|
/* Bitmaps of which sentences we're looking for to allow us to handle out-of-order GSVs */
|
|
static uint8_t gsv_expected_mask;
|
|
static uint8_t gsv_processed_mask;
|
|
/* Error counters */
|
|
static uint16_t gsv_incomplete_error;
|
|
static uint16_t gsv_duplicate_error;
|
|
|
|
static bool nmeaProcessGPGSV(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam)
|
|
{
|
|
if (nbParam < 4)
|
|
return false;
|
|
|
|
#ifdef NMEA_DEBUG_GSV
|
|
DEBUG_MSG("\n Sentence=%s/%s\n", param[2], param[1]);
|
|
DEBUG_MSG(" Sats=%s\n", param[3]);
|
|
#endif
|
|
|
|
uint8_t nbSentences = atoi(param[1]);
|
|
uint8_t currSentence = atoi(param[2]);
|
|
|
|
*gpsDataUpdated = true;
|
|
|
|
if (nbSentences < 1 || nbSentences > 8 || currSentence < 1 || currSentence > nbSentences)
|
|
return false;
|
|
|
|
gsv_partial.SatsInView = atoi(param[3]);
|
|
|
|
// Find out if this is the first sentence in the GSV set
|
|
if (currSentence == 1) {
|
|
if (gsv_expected_mask != gsv_processed_mask) {
|
|
// We are starting over when we haven't yet finished our previous GSV group
|
|
gsv_incomplete_error++;
|
|
}
|
|
|
|
// First GSV sentence in the sequence, reset our expected_mask
|
|
gsv_expected_mask = (1 << nbSentences) - 1;
|
|
}
|
|
|
|
uint8_t current_sentence_id = (1 << (currSentence - 1));
|
|
if (gsv_processed_mask & current_sentence_id) {
|
|
/* Duplicate sentence in this GSV set */
|
|
gsv_duplicate_error++;
|
|
} else {
|
|
/* Note that we've seen this sentence */
|
|
gsv_processed_mask |= current_sentence_id;
|
|
}
|
|
|
|
uint8_t parIdx = 4;
|
|
|
|
#ifdef NMEA_DEBUG_GSV
|
|
DEBUG_MSG(" PRN:");
|
|
#endif
|
|
|
|
/* Make sure this sentence can fit in our GPSSatellites object */
|
|
if ((currSentence * 4) <= NELEMENTS(gsv_partial.PRN)) {
|
|
/* Process 4 blocks of satellite info */
|
|
for (uint8_t i = 0; parIdx+4 <= nbParam && i < 4; i++) {
|
|
uint8_t sat_index = ((currSentence - 1) * 4) + i;
|
|
|
|
// Get sat info
|
|
gsv_partial.PRN[sat_index] = atoi(param[parIdx++]);
|
|
gsv_partial.Elevation[sat_index] = NMEA_real_to_float(param[parIdx++]);
|
|
gsv_partial.Azimuth[sat_index] = NMEA_real_to_float(param[parIdx++]);
|
|
gsv_partial.SNR[sat_index] = atoi(param[parIdx++]);
|
|
#ifdef NMEA_DEBUG_GSV
|
|
DEBUG_MSG(" %d", gsv_partial.PRN[sat_index]);
|
|
#endif
|
|
}
|
|
}
|
|
#ifdef NMEA_DEBUG_GSV
|
|
DEBUG_MSG("\n");
|
|
#endif
|
|
|
|
|
|
/* Find out if we're finished processing all GSV sentences in the set */
|
|
if ((gsv_expected_mask != 0) && (gsv_processed_mask == gsv_expected_mask)) {
|
|
/* GSV set has been fully processed. Update the GPSSatellites object. */
|
|
GPSSatellitesSet(&gsv_partial);
|
|
memset((void *)&gsv_partial, 0, sizeof(gsv_partial));
|
|
gsv_expected_mask = 0;
|
|
gsv_processed_mask = 0;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Parse an NMEA GPGSA sentence and update the given UAVObject
|
|
* \param[in] A pointer to a GPSPosition UAVObject to be updated.
|
|
* \param[in] An NMEA sentence with a valid checksum
|
|
*/
|
|
static bool nmeaProcessGPGSA(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam)
|
|
{
|
|
if (nbParam != 18)
|
|
return false;
|
|
|
|
#ifdef NMEA_DEBUG_GSA
|
|
DEBUG_MSG("\n Status=%s\n", param[2]);
|
|
DEBUG_MSG(" PDOP=%s\n", param[15]);
|
|
DEBUG_MSG(" HDOP=%s\n", param[16]);
|
|
DEBUG_MSG(" VDOP=%s\n", param[17]);
|
|
#endif
|
|
|
|
*gpsDataUpdated = true;
|
|
|
|
switch (atoi(param[2])) {
|
|
case 1:
|
|
GpsData->Status = GPSPOSITION_STATUS_NOFIX;
|
|
break;
|
|
case 2:
|
|
GpsData->Status = GPSPOSITION_STATUS_FIX2D;
|
|
break;
|
|
case 3:
|
|
GpsData->Status = GPSPOSITION_STATUS_FIX3D;
|
|
break;
|
|
default:
|
|
/* Unhandled */
|
|
return false;
|
|
break;
|
|
}
|
|
|
|
// next field: PDOP
|
|
GpsData->PDOP = NMEA_real_to_float(param[15]);
|
|
|
|
// next field: HDOP
|
|
GpsData->HDOP = NMEA_real_to_float(param[16]);
|
|
|
|
// next field: VDOP
|
|
GpsData->VDOP = NMEA_real_to_float(param[17]);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* Parse an NMEA PGTOP sentence and update the given UAVObject
|
|
* \param[in] A pointer to a GPSPosition UAVObject to be updated.
|
|
* \param[in] An NMEA sentence with a valid checksum
|
|
*/
|
|
static bool nmeaProcessPGTOP(GPSPositionData * GpsData, bool* gpsDataUpdated, char* param[], uint8_t nbParam)
|
|
{
|
|
if (nbParam != 17)
|
|
return false;
|
|
|
|
GPSTimeData gpst;
|
|
GPSTimeGet(&gpst);
|
|
|
|
*gpsDataUpdated = true;
|
|
|
|
// get UTC time [hhmmss.sss]
|
|
float hms = NMEA_real_to_float(param[1]);
|
|
gpst.Second = (int)hms % 100;
|
|
gpst.Minute = (((int)hms - gpst.Second) / 100) % 100;
|
|
gpst.Hour = (int)hms / 10000;
|
|
|
|
// get latitude decimal degrees
|
|
GpsData->Latitude = NMEA_real_to_float(param[2])*1e7;
|
|
if (param[3][0] == 'S')
|
|
GpsData->Latitude = -GpsData->Latitude;
|
|
|
|
|
|
// get longitude decimal degrees
|
|
GpsData->Longitude = NMEA_real_to_float(param[4])*1e7;
|
|
if (param[5][0] == 'W')
|
|
GpsData->Longitude = -GpsData->Longitude;
|
|
|
|
// get number of satellites used in GPS solution
|
|
GpsData->Satellites = atoi(param[7]);
|
|
|
|
// next field: HDOP
|
|
GpsData->HDOP = NMEA_real_to_float(param[8]);
|
|
|
|
// get altitude (in meters mm.m)
|
|
GpsData->Altitude = NMEA_real_to_float(param[9]);
|
|
|
|
// next field: geoid separation
|
|
GpsData->GeoidSeparation = NMEA_real_to_float(param[10]);
|
|
|
|
// Mode: 1=Fix not available, 2=2D, 3=3D
|
|
switch (atoi(param[11])) {
|
|
case 1:
|
|
GpsData->Status = GPSPOSITION_STATUS_NOFIX;
|
|
break;
|
|
case 2:
|
|
GpsData->Status = GPSPOSITION_STATUS_FIX2D;
|
|
break;
|
|
case 3:
|
|
GpsData->Status = GPSPOSITION_STATUS_FIX3D;
|
|
break;
|
|
default:
|
|
/* Unhandled */
|
|
return false;
|
|
break;
|
|
}
|
|
|
|
// get course over ground in degrees [ddd.dd]
|
|
GpsData->Heading = NMEA_real_to_float(param[12]);
|
|
|
|
// get speed in km/h
|
|
GpsData->Groundspeed = NMEA_real_to_float(param[13]);
|
|
// to m/s
|
|
GpsData->Groundspeed /= 3.6;
|
|
|
|
gpst.Day = atoi(param[14]);
|
|
gpst.Month = atoi(param[15]);
|
|
gpst.Year = atoi(param[16]);
|
|
GPSTimeSet(&gpst);
|
|
|
|
return true;
|
|
}
|
|
|