Forked para SNOCC
Fork of GPS by
GPS.cpp@1:1de2fc75bf38, 2016-12-04 (annotated)
- Committer:
- gstedile
- Date:
- Sun Dec 04 20:14:00 2016 +0000
- Revision:
- 1:1de2fc75bf38
- Parent:
- 0:15611c7938a3
Prueba
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
simon | 0:15611c7938a3 | 1 | /* mbed EM-406 GPS Module Library |
simon | 0:15611c7938a3 | 2 | * Copyright (c) 2008-2010, sford |
simon | 0:15611c7938a3 | 3 | * |
simon | 0:15611c7938a3 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
simon | 0:15611c7938a3 | 5 | * of this software and associated documentation files (the "Software"), to deal |
simon | 0:15611c7938a3 | 6 | * in the Software without restriction, including without limitation the rights |
simon | 0:15611c7938a3 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
simon | 0:15611c7938a3 | 8 | * copies of the Software, and to permit persons to whom the Software is |
simon | 0:15611c7938a3 | 9 | * furnished to do so, subject to the following conditions: |
simon | 0:15611c7938a3 | 10 | * |
simon | 0:15611c7938a3 | 11 | * The above copyright notice and this permission notice shall be included in |
simon | 0:15611c7938a3 | 12 | * all copies or substantial portions of the Software. |
simon | 0:15611c7938a3 | 13 | * |
simon | 0:15611c7938a3 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
simon | 0:15611c7938a3 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
simon | 0:15611c7938a3 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
simon | 0:15611c7938a3 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
simon | 0:15611c7938a3 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
simon | 0:15611c7938a3 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
simon | 0:15611c7938a3 | 20 | * THE SOFTWARE. |
simon | 0:15611c7938a3 | 21 | */ |
simon | 0:15611c7938a3 | 22 | |
simon | 0:15611c7938a3 | 23 | #include "GPS.h" |
simon | 0:15611c7938a3 | 24 | |
simon | 0:15611c7938a3 | 25 | GPS::GPS(PinName tx, PinName rx) : _gps(tx, rx) { |
gstedile | 1:1de2fc75bf38 | 26 | _gps.baud(9600); // Cambio baudrate a 9600 |
simon | 0:15611c7938a3 | 27 | longitude = 0.0; |
gstedile | 1:1de2fc75bf38 | 28 | latitude = 0.0; |
gstedile | 1:1de2fc75bf38 | 29 | |
simon | 0:15611c7938a3 | 30 | } |
simon | 0:15611c7938a3 | 31 | |
simon | 0:15611c7938a3 | 32 | int GPS::sample() { |
simon | 0:15611c7938a3 | 33 | float time; |
gstedile | 1:1de2fc75bf38 | 34 | char ns, ew, signal; // Agrego signal para parsear el campo NMEA que indica es estado de señal. |
simon | 0:15611c7938a3 | 35 | int lock; |
gstedile | 1:1de2fc75bf38 | 36 | |
simon | 0:15611c7938a3 | 37 | |
simon | 0:15611c7938a3 | 38 | while(1) { |
simon | 0:15611c7938a3 | 39 | getline(); |
gstedile | 1:1de2fc75bf38 | 40 | |
gstedile | 1:1de2fc75bf38 | 41 | |
simon | 0:15611c7938a3 | 42 | |
gstedile | 1:1de2fc75bf38 | 43 | /* |
gstedile | 1:1de2fc75bf38 | 44 | GGA - essential fix data which provide 3D location and accuracy data. |
gstedile | 1:1de2fc75bf38 | 45 | |
gstedile | 1:1de2fc75bf38 | 46 | $GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47 |
gstedile | 1:1de2fc75bf38 | 47 | |
gstedile | 1:1de2fc75bf38 | 48 | Where: |
gstedile | 1:1de2fc75bf38 | 49 | GGA Global Positioning System Fix Data |
gstedile | 1:1de2fc75bf38 | 50 | 123519 Fix taken at 12:35:19 UTC |
gstedile | 1:1de2fc75bf38 | 51 | 4807.038,N Latitude 48 deg 07.038' N |
gstedile | 1:1de2fc75bf38 | 52 | 01131.000,E Longitude 11 deg 31.000' E |
gstedile | 1:1de2fc75bf38 | 53 | 1 Fix quality: 0 = invalid |
gstedile | 1:1de2fc75bf38 | 54 | 1 = GPS fix (SPS) |
gstedile | 1:1de2fc75bf38 | 55 | 2 = DGPS fix |
gstedile | 1:1de2fc75bf38 | 56 | 3 = PPS fix |
gstedile | 1:1de2fc75bf38 | 57 | 4 = Real Time Kinematic |
gstedile | 1:1de2fc75bf38 | 58 | 5 = Float RTK |
gstedile | 1:1de2fc75bf38 | 59 | 6 = estimated (dead reckoning) (2.3 feature) |
gstedile | 1:1de2fc75bf38 | 60 | 7 = Manual input mode |
gstedile | 1:1de2fc75bf38 | 61 | 8 = Simulation mode |
gstedile | 1:1de2fc75bf38 | 62 | 08 Number of satellites being tracked |
gstedile | 1:1de2fc75bf38 | 63 | 0.9 Horizontal dilution of position |
gstedile | 1:1de2fc75bf38 | 64 | 545.4,M Altitude, Meters, above mean sea level |
gstedile | 1:1de2fc75bf38 | 65 | 46.9,M Height of geoid (mean sea level) above WGS84 |
gstedile | 1:1de2fc75bf38 | 66 | ellipsoid |
gstedile | 1:1de2fc75bf38 | 67 | (empty field) time in seconds since last DGPS update |
gstedile | 1:1de2fc75bf38 | 68 | (empty field) DGPS station ID number |
gstedile | 1:1de2fc75bf38 | 69 | *47 the checksum data, always begins with * |
gstedile | 1:1de2fc75bf38 | 70 | */ |
gstedile | 1:1de2fc75bf38 | 71 | |
gstedile | 1:1de2fc75bf38 | 72 | |
gstedile | 1:1de2fc75bf38 | 73 | /* |
gstedile | 1:1de2fc75bf38 | 74 | sscanf(msg, "GN %s",mensaje1); |
gstedile | 1:1de2fc75bf38 | 75 | sscanf(msg, "GP,%s", mensaje2); |
gstedile | 1:1de2fc75bf38 | 76 | sscanf(msg, "GSV,%s", mensaje3); |
gstedile | 1:1de2fc75bf38 | 77 | sscanf(msg, "G,%s", mensaje4); |
gstedile | 1:1de2fc75bf38 | 78 | */ |
gstedile | 1:1de2fc75bf38 | 79 | // $GPRMC,194530.000,A,3051.8007,N,10035.9989,W,1.49,111.67,310714,,,A*74 Esta es la trama GP. En nuestro caso es GN: |
gstedile | 1:1de2fc75bf38 | 80 | |
gstedile | 1:1de2fc75bf38 | 81 | if(sscanf(msg, "GNRMC, %f,%c,%f,%c,%f,%c,%f", &time, &signal, &latitude, &ns, &longitude, &ew, &speed) >=1){ |
gstedile | 1:1de2fc75bf38 | 82 | // Agrego las siguientes lineas porque originalmente se analizaba el mensaje GGA y se evaluaba "lock" para saber si habia datos validos |
gstedile | 1:1de2fc75bf38 | 83 | // y ahora evaluo si la señal (signal) está Available (A) o Void (V). Lo dejo asi por si se retorna a GGA. |
gstedile | 1:1de2fc75bf38 | 84 | |
gstedile | 1:1de2fc75bf38 | 85 | if(signal == 'A'){ |
gstedile | 1:1de2fc75bf38 | 86 | lock = 1; |
gstedile | 1:1de2fc75bf38 | 87 | } |
gstedile | 1:1de2fc75bf38 | 88 | else { |
gstedile | 1:1de2fc75bf38 | 89 | lock = 0; |
gstedile | 1:1de2fc75bf38 | 90 | } |
gstedile | 1:1de2fc75bf38 | 91 | |
gstedile | 1:1de2fc75bf38 | 92 | // if(sscanf(msg, "GNGGA,%f,%f,%c,%f,%c,%d", &time, &latitude, &ns, &longitude, &ew, &lock) >= 1) { |
gstedile | 1:1de2fc75bf38 | 93 | |
gstedile | 1:1de2fc75bf38 | 94 | |
gstedile | 1:1de2fc75bf38 | 95 | |
gstedile | 1:1de2fc75bf38 | 96 | if(!lock) { |
gstedile | 1:1de2fc75bf38 | 97 | |
simon | 0:15611c7938a3 | 98 | longitude = 0.0; |
gstedile | 1:1de2fc75bf38 | 99 | latitude = 0.0; |
gstedile | 1:1de2fc75bf38 | 100 | speed = 0.0; // |
simon | 0:15611c7938a3 | 101 | return 0; |
gstedile | 1:1de2fc75bf38 | 102 | } |
gstedile | 1:1de2fc75bf38 | 103 | |
gstedile | 1:1de2fc75bf38 | 104 | else { |
simon | 0:15611c7938a3 | 105 | if(ns == 'S') { latitude *= -1.0; } |
simon | 0:15611c7938a3 | 106 | if(ew == 'W') { longitude *= -1.0; } |
gstedile | 1:1de2fc75bf38 | 107 | float degrees = trunc(latitude / 100.0f); // El formato del campo es GGMM.MMMM: Divido por 100 y tomo parte entera para los grados. |
gstedile | 1:1de2fc75bf38 | 108 | float minutes = latitude - (degrees * 100.0f); // Resto los grados y me quedo con los minutos |
gstedile | 1:1de2fc75bf38 | 109 | latitude = degrees + minutes / 60.0f; // Convierto a decimal sumando grados y dividiendo entre 60 los minutos |
gstedile | 1:1de2fc75bf38 | 110 | //degrees = trunc(longitude / 100.0f * 0.01f); // Corrijo esta linea porque es como dividir por 10000. |
gstedile | 1:1de2fc75bf38 | 111 | degrees = trunc(longitude / 100.0f); // Repito para la latitud. |
simon | 0:15611c7938a3 | 112 | minutes = longitude - (degrees * 100.0f); |
simon | 0:15611c7938a3 | 113 | longitude = degrees + minutes / 60.0f; |
gstedile | 1:1de2fc75bf38 | 114 | speed *= 1.852000f; // Convierto nudos a km/h |
gstedile | 1:1de2fc75bf38 | 115 | |
simon | 0:15611c7938a3 | 116 | return 1; |
gstedile | 1:1de2fc75bf38 | 117 | |
simon | 0:15611c7938a3 | 118 | } |
simon | 0:15611c7938a3 | 119 | } |
gstedile | 1:1de2fc75bf38 | 120 | |
simon | 0:15611c7938a3 | 121 | } |
simon | 0:15611c7938a3 | 122 | } |
simon | 0:15611c7938a3 | 123 | |
simon | 0:15611c7938a3 | 124 | float GPS::trunc(float v) { |
simon | 0:15611c7938a3 | 125 | if(v < 0.0) { |
simon | 0:15611c7938a3 | 126 | v*= -1.0; |
simon | 0:15611c7938a3 | 127 | v = floor(v); |
simon | 0:15611c7938a3 | 128 | v*=-1.0; |
simon | 0:15611c7938a3 | 129 | } else { |
simon | 0:15611c7938a3 | 130 | v = floor(v); |
simon | 0:15611c7938a3 | 131 | } |
simon | 0:15611c7938a3 | 132 | return v; |
simon | 0:15611c7938a3 | 133 | } |
simon | 0:15611c7938a3 | 134 | |
simon | 0:15611c7938a3 | 135 | void GPS::getline() { |
simon | 0:15611c7938a3 | 136 | while(_gps.getc() != '$'); // wait for the start of a line |
simon | 0:15611c7938a3 | 137 | for(int i=0; i<256; i++) { |
simon | 0:15611c7938a3 | 138 | msg[i] = _gps.getc(); |
simon | 0:15611c7938a3 | 139 | if(msg[i] == '\r') { |
simon | 0:15611c7938a3 | 140 | msg[i] = 0; |
simon | 0:15611c7938a3 | 141 | return; |
simon | 0:15611c7938a3 | 142 | } |
simon | 0:15611c7938a3 | 143 | } |
simon | 0:15611c7938a3 | 144 | error("Overflowed message limit"); |
simon | 0:15611c7938a3 | 145 | } |