Rune L / SerialGPS

Slightly modified version of the SerialGPS library (https://os.mbed.com/teams/components/code/SerialGPS/) to support the BufferedSerial class

SerialGPS.cpp@0:1a8299deb917, 2021-02-12 (annotated)

Committer:
runesla
Date:
Fri Feb 12 12:39:46 2021 +0100
Revision:
0:1a8299deb917
Child:
1:214714f54773
init

Who changed what in which revision?

UserRevisionLine numberNew contents of line
runesla 0:1a8299deb917 1 /* mbed GPS Module Library
runesla 0:1a8299deb917 2 * Copyright (c) 2008-2010, sford
runesla 0:1a8299deb917 3 * Copyright (c) 2013, B.Adryan
runesla 0:1a8299deb917 4 *
runesla 0:1a8299deb917 5 * Permission is hereby granted, free of charge, to any person obtaining a copy
runesla 0:1a8299deb917 6 * of this software and associated documentation files (the "Software"), to deal
runesla 0:1a8299deb917 7 * in the Software without restriction, including without limitation the rights
runesla 0:1a8299deb917 8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
runesla 0:1a8299deb917 9 * copies of the Software, and to permit persons to whom the Software is
runesla 0:1a8299deb917 10 * furnished to do so, subject to the following conditions:
runesla 0:1a8299deb917 11 *
runesla 0:1a8299deb917 12 * The above copyright notice and this permission notice shall be included in
runesla 0:1a8299deb917 13 * all copies or substantial portions of the Software.
runesla 0:1a8299deb917 14 *
runesla 0:1a8299deb917 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
runesla 0:1a8299deb917 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
runesla 0:1a8299deb917 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
runesla 0:1a8299deb917 18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
runesla 0:1a8299deb917 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
runesla 0:1a8299deb917 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
runesla 0:1a8299deb917 21 * THE SOFTWARE.
runesla 0:1a8299deb917 22 */
runesla 0:1a8299deb917 23
runesla 0:1a8299deb917 24 #include "SerialGPS.h"
runesla 0:1a8299deb917 25
runesla 0:1a8299deb917 26 SerialGPS::SerialGPS(PinName tx, PinName rx, int Baud) : _gps(tx, rx) {
runesla 0:1a8299deb917 27 _gps.set_baud(Baud);
runesla 0:1a8299deb917 28 longitude = 0.0;
runesla 0:1a8299deb917 29 latitude = 0.0;
runesla 0:1a8299deb917 30 }
runesla 0:1a8299deb917 31
runesla 0:1a8299deb917 32 int SerialGPS::sample() {
runesla 0:1a8299deb917 33 char ns, ew, unit;
runesla 0:1a8299deb917 34 int lock;
runesla 0:1a8299deb917 35
runesla 0:1a8299deb917 36 while(1) {
runesla 0:1a8299deb917 37 getline();
runesla 0:1a8299deb917 38
runesla 0:1a8299deb917 39 // Check if it is a GPGGA msg (matches both locked and non-locked msg)
runesla 0:1a8299deb917 40 if(sscanf(msg, "GPGGA,%f,%f,%c,%f,%c,%d,%d,%f,%f,%c,%f", &time, &latitude, &ns, &longitude, &ew, &lock, &sats, &hdop, &alt, &unit, &geoid) >= 1)
runesla 0:1a8299deb917 41 {
runesla 0:1a8299deb917 42 if(!lock)
runesla 0:1a8299deb917 43 {
runesla 0:1a8299deb917 44 time = 0.0;
runesla 0:1a8299deb917 45 longitude = 0.0;
runesla 0:1a8299deb917 46 latitude = 0.0;
runesla 0:1a8299deb917 47 sats = 0;
runesla 0:1a8299deb917 48 hdop = 0.0;
runesla 0:1a8299deb917 49 alt = 0.0;
runesla 0:1a8299deb917 50 geoid = 0.0;
runesla 0:1a8299deb917 51
runesla 0:1a8299deb917 52 return 0;
runesla 0:1a8299deb917 53 }
runesla 0:1a8299deb917 54 else
runesla 0:1a8299deb917 55 {
runesla 0:1a8299deb917 56 //GPGGA format according http://aprs.gids.nl/nmea/#gga
runesla 0:1a8299deb917 57 // time (float), lat (f), (N/S) (c), long (f), (E/W) (c), fix (d), sats (d),
runesla 0:1a8299deb917 58 // hdop (float), altitude (float), M, geoid (float), M, , ,
runesla 0:1a8299deb917 59 //GPGGA,092010.000,5210.9546,N,00008.8913,E,1,07,1.3,9.7,M,47.0,M,,0000*5D
runesla 0:1a8299deb917 60
runesla 0:1a8299deb917 61 if(ns == 'S') { latitude *= -1.0; }
runesla 0:1a8299deb917 62 if(ew == 'W') { longitude *= -1.0; }
runesla 0:1a8299deb917 63
runesla 0:1a8299deb917 64 float degrees = trunc(latitude / 100.0f);
runesla 0:1a8299deb917 65 float minutes = latitude - (degrees * 100.0f);
runesla 0:1a8299deb917 66
runesla 0:1a8299deb917 67 latitude = degrees + minutes / 60.0f;
runesla 0:1a8299deb917 68 degrees = trunc(longitude / 100.0f * 0.01f);
runesla 0:1a8299deb917 69 minutes = longitude - (degrees * 100.0f);
runesla 0:1a8299deb917 70 longitude = degrees + minutes / 60.0f;
runesla 0:1a8299deb917 71
runesla 0:1a8299deb917 72 return 1;
runesla 0:1a8299deb917 73 }
runesla 0:1a8299deb917 74 }
runesla 0:1a8299deb917 75 }
runesla 0:1a8299deb917 76 }
runesla 0:1a8299deb917 77
runesla 0:1a8299deb917 78 float SerialGPS::trunc(float v)
runesla 0:1a8299deb917 79 {
runesla 0:1a8299deb917 80 if(v < 0.0)
runesla 0:1a8299deb917 81 {
runesla 0:1a8299deb917 82 v*= -1.0;
runesla 0:1a8299deb917 83 v = floor(v);
runesla 0:1a8299deb917 84 v*=-1.0;
runesla 0:1a8299deb917 85 }
runesla 0:1a8299deb917 86 else
runesla 0:1a8299deb917 87 {
runesla 0:1a8299deb917 88 v = floor(v);
runesla 0:1a8299deb917 89 }
runesla 0:1a8299deb917 90 return v;
runesla 0:1a8299deb917 91 }
runesla 0:1a8299deb917 92
runesla 0:1a8299deb917 93 void SerialGPS::getline()
runesla 0:1a8299deb917 94 {
runesla 0:1a8299deb917 95 while(_gps.getc() != '$'); // wait for the start of a line
runesla 0:1a8299deb917 96
runesla 0:1a8299deb917 97 for(int i = 0; i < 256; i++)
runesla 0:1a8299deb917 98 {
runesla 0:1a8299deb917 99 msg[i] = _gps.getc();
runesla 0:1a8299deb917 100 if(msg[i] == '\r')
runesla 0:1a8299deb917 101 {
runesla 0:1a8299deb917 102 msg[i] = 0;
runesla 0:1a8299deb917 103 return;
runesla 0:1a8299deb917 104 }
runesla 0:1a8299deb917 105 }
runesla 0:1a8299deb917 106
runesla 0:1a8299deb917 107 error("Overflowed message limit");
runesla 0:1a8299deb917 108 }