kopia lustrzana https://github.com/OpenRTX/OpenRTX
98 wiersze
3.2 KiB
C
98 wiersze
3.2 KiB
C
/***************************************************************************
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* Copyright (C) 2021 - 2025 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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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, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include <sys/time.h>
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#include <stdbool.h>
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#include <string.h>
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#include <gps.h>
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#define MAX_NMEA_LEN 80
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#define NMEA_SAMPLES 8
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static const char test_nmea_sentences[NMEA_SAMPLES][MAX_NMEA_LEN] =
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{
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"$GPGGA,223659.522,5333.735,N,00959.130,E,1,12,1.0,0.0,M,0.0,M,,*62",
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"$GPGSA,A,3,01,02,03,04,05,06,07,08,09,10,11,12,1.0,1.0,1.0*30",
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"$GPGSV,3,1,12,30,79,066,27,05,63,275,21,07,42,056,,13,40,289,13*76",
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"$GPGSV,3,2,12,14,36,147,20,28,30,151,,09,13,100,,02,08,226,30*72",
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"$GPGSV,3,3,12,18,05,333,,15,04,289,22,08,03,066,,27,02,030,*79",
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"$GPRMC,223659.522,A,5333.735,N,00959.130,E,,,160221,000.0,W*70",
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"$GPVTG,92.15,T,,M,0.15,N,0.28,K,A*0C"
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};
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static long long startTime;
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static bool enabled = true;
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static int currSentence = 0;
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static inline long long now()
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{
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struct timeval te;
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gettimeofday(&te, NULL);
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return (te.tv_sec*1000LL) + (te.tv_usec/1000);
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}
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static void enable(void *priv)
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{
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(void) priv;
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enabled = true;
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currSentence = 0;
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startTime = now();
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}
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static void disable(void *priv)
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{
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(void) priv;
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enabled = false;
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}
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static int getNmeaSentence(void *priv, char *buf, const size_t bufSize)
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{
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(void) priv;
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// GPS off > no data
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if(!enabled)
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return 0;
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// Emit one sentence every 1s
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long long currTime = now();
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if((currTime - startTime) < 1000)
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return 0;
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size_t len = strnlen(test_nmea_sentences[currSentence], MAX_NMEA_LEN);
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if(len > bufSize)
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return -1;
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strncpy(buf, test_nmea_sentences[currSentence], bufSize);
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currSentence += 1;
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currSentence %= NMEA_SAMPLES;
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startTime = currTime;
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return (int) len;
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}
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const struct gpsDevice gps = {
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.enable = enable,
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.disable = disable,
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.getSentence = getNmeaSentence
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};
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