GPS Tweeter program that tweets the device's GPS location every 5 minutes.
Dependencies: EthernetNetIf HTTPClient mbed
Fork of TwitterExample by
GPS.cpp@6:a5d8918748fa, 2013-10-16 (annotated)
- Committer:
- 4180skrw
- Date:
- Wed Oct 16 20:42:20 2013 +0000
- Revision:
- 6:a5d8918748fa
- Parent:
- 4:2d5b7c5b995e
fixed
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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4180skrw | 4:2d5b7c5b995e | 1 | /* mbed EM-406 GPS Module Library |
4180skrw | 4:2d5b7c5b995e | 2 | * Copyright (c) 2008-2010, sford |
4180skrw | 4:2d5b7c5b995e | 3 | * |
4180skrw | 4:2d5b7c5b995e | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
4180skrw | 4:2d5b7c5b995e | 5 | * of this software and associated documentation files (the "Software"), to deal |
4180skrw | 4:2d5b7c5b995e | 6 | * in the Software without restriction, including without limitation the rights |
4180skrw | 4:2d5b7c5b995e | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
4180skrw | 4:2d5b7c5b995e | 8 | * copies of the Software, and to permit persons to whom the Software is |
4180skrw | 4:2d5b7c5b995e | 9 | * furnished to do so, subject to the following conditions: |
4180skrw | 4:2d5b7c5b995e | 10 | * |
4180skrw | 4:2d5b7c5b995e | 11 | * The above copyright notice and this permission notice shall be included in |
4180skrw | 4:2d5b7c5b995e | 12 | * all copies or substantial portions of the Software. |
4180skrw | 4:2d5b7c5b995e | 13 | * |
4180skrw | 4:2d5b7c5b995e | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
4180skrw | 4:2d5b7c5b995e | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
4180skrw | 4:2d5b7c5b995e | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
4180skrw | 4:2d5b7c5b995e | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
4180skrw | 4:2d5b7c5b995e | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
4180skrw | 4:2d5b7c5b995e | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
4180skrw | 4:2d5b7c5b995e | 20 | * THE SOFTWARE. |
4180skrw | 4:2d5b7c5b995e | 21 | */ |
4180skrw | 4:2d5b7c5b995e | 22 | |
4180skrw | 4:2d5b7c5b995e | 23 | #include "GPS.h" |
4180skrw | 4:2d5b7c5b995e | 24 | |
4180skrw | 4:2d5b7c5b995e | 25 | GPS::GPS(PinName tx, PinName rx) : _gps(tx, rx) { |
4180skrw | 4:2d5b7c5b995e | 26 | _gps.baud(4800); |
4180skrw | 4:2d5b7c5b995e | 27 | longitude = 0.0; |
4180skrw | 4:2d5b7c5b995e | 28 | latitude = 0.0; |
4180skrw | 4:2d5b7c5b995e | 29 | } |
4180skrw | 4:2d5b7c5b995e | 30 | |
4180skrw | 4:2d5b7c5b995e | 31 | int GPS::sample() { |
4180skrw | 4:2d5b7c5b995e | 32 | float time; |
4180skrw | 4:2d5b7c5b995e | 33 | char ns, ew; |
4180skrw | 4:2d5b7c5b995e | 34 | int lock; |
4180skrw | 4:2d5b7c5b995e | 35 | |
4180skrw | 4:2d5b7c5b995e | 36 | //return 1; //testing by Jigar |
4180skrw | 4:2d5b7c5b995e | 37 | while (1) { |
4180skrw | 4:2d5b7c5b995e | 38 | getline(); |
4180skrw | 4:2d5b7c5b995e | 39 | //printf("\n\rentered the GPS.sample while loop \n\r %s\n\r", msg); |
4180skrw | 4:2d5b7c5b995e | 40 | |
4180skrw | 4:2d5b7c5b995e | 41 | |
4180skrw | 4:2d5b7c5b995e | 42 | // Check if it is a GPGGA msg (matches both locked and non-locked msg) |
4180skrw | 4:2d5b7c5b995e | 43 | // $GPGGA,000116.031,,,,,0,00,,,M,0.0,M,,0000*52 |
4180skrw | 4:2d5b7c5b995e | 44 | /* |
4180skrw | 4:2d5b7c5b995e | 45 | eg3. $GPGGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh |
4180skrw | 4:2d5b7c5b995e | 46 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
4180skrw | 4:2d5b7c5b995e | 47 | 1 = UTC of Position |
4180skrw | 4:2d5b7c5b995e | 48 | 2 = Latitude |
4180skrw | 4:2d5b7c5b995e | 49 | 3 = N or S |
4180skrw | 4:2d5b7c5b995e | 50 | 4 = Longitude |
4180skrw | 4:2d5b7c5b995e | 51 | 5 = E or W |
4180skrw | 4:2d5b7c5b995e | 52 | 6 = GPS quality indicator (0=invalid; 1=GPS fix; 2=Diff. GPS fix) |
4180skrw | 4:2d5b7c5b995e | 53 | 7 = Number of satellites in use [not those in view] |
4180skrw | 4:2d5b7c5b995e | 54 | 8 = Horizontal dilution of position |
4180skrw | 4:2d5b7c5b995e | 55 | 9 = Antenna altitude above/below mean sea level (geoid) |
4180skrw | 4:2d5b7c5b995e | 56 | 10 = Meters (Antenna height unit) |
4180skrw | 4:2d5b7c5b995e | 57 | 11 = Geoidal separation (Diff. between WGS-84 earth ellipsoid and |
4180skrw | 4:2d5b7c5b995e | 58 | mean sea level. -=geoid is below WGS-84 ellipsoid) |
4180skrw | 4:2d5b7c5b995e | 59 | 12 = Meters (Units of geoidal separation) |
4180skrw | 4:2d5b7c5b995e | 60 | 13 = Age in seconds since last update from diff. reference station |
4180skrw | 4:2d5b7c5b995e | 61 | 14 = Diff. reference station ID# |
4180skrw | 4:2d5b7c5b995e | 62 | 15 = Checksum |
4180skrw | 4:2d5b7c5b995e | 63 | |
4180skrw | 4:2d5b7c5b995e | 64 | */ |
4180skrw | 4:2d5b7c5b995e | 65 | // if (sscanf(msg, "GPGGA,%f,%f,%c,%f,%c,%*d,%*d, %*f,%*f,%*f,%*f,%*f,%*f,%d ", &time, &latitude, &ns, &longitude, &ew, &lock) >= 1) { |
4180skrw | 4:2d5b7c5b995e | 66 | if(sscanf(msg, "GPGGA,%f,%f,%c,%f,%c,%d", &time, &latitude, &ns, &longitude, &ew, &lock) >= 1) { |
4180skrw | 4:2d5b7c5b995e | 67 | |
4180skrw | 4:2d5b7c5b995e | 68 | if (!lock) { |
4180skrw | 4:2d5b7c5b995e | 69 | longitude = 0.0; |
4180skrw | 4:2d5b7c5b995e | 70 | latitude = 0.0; |
4180skrw | 4:2d5b7c5b995e | 71 | return 0; |
4180skrw | 4:2d5b7c5b995e | 72 | } else { |
4180skrw | 4:2d5b7c5b995e | 73 | if (ns == 'S') { |
4180skrw | 4:2d5b7c5b995e | 74 | latitude *= -1.0; |
4180skrw | 4:2d5b7c5b995e | 75 | } |
4180skrw | 4:2d5b7c5b995e | 76 | if (ew == 'W') { |
4180skrw | 4:2d5b7c5b995e | 77 | longitude *= -1.0; |
4180skrw | 4:2d5b7c5b995e | 78 | } |
4180skrw | 4:2d5b7c5b995e | 79 | float degrees = trunc(latitude / 100.0f); |
4180skrw | 4:2d5b7c5b995e | 80 | float minutes = latitude - (degrees * 100.0f); |
4180skrw | 4:2d5b7c5b995e | 81 | latitude = degrees + minutes / 60.0f; |
4180skrw | 4:2d5b7c5b995e | 82 | degrees = trunc(longitude / 100.0f ); //degrees = trunc(longitude / 100.0f * 0.01f); |
4180skrw | 4:2d5b7c5b995e | 83 | minutes = longitude - (degrees * 100.0f); |
4180skrw | 4:2d5b7c5b995e | 84 | longitude = degrees + minutes / 60.0f; |
4180skrw | 4:2d5b7c5b995e | 85 | return 1; |
4180skrw | 4:2d5b7c5b995e | 86 | } |
4180skrw | 4:2d5b7c5b995e | 87 | } |
4180skrw | 4:2d5b7c5b995e | 88 | } |
4180skrw | 4:2d5b7c5b995e | 89 | } |
4180skrw | 4:2d5b7c5b995e | 90 | |
4180skrw | 4:2d5b7c5b995e | 91 | float GPS::trunc(float v) { |
4180skrw | 4:2d5b7c5b995e | 92 | if (v < 0.0) { |
4180skrw | 4:2d5b7c5b995e | 93 | v*= -1.0; |
4180skrw | 4:2d5b7c5b995e | 94 | v = floor(v); |
4180skrw | 4:2d5b7c5b995e | 95 | v*=-1.0; |
4180skrw | 4:2d5b7c5b995e | 96 | } else { |
4180skrw | 4:2d5b7c5b995e | 97 | v = floor(v); |
4180skrw | 4:2d5b7c5b995e | 98 | } |
4180skrw | 4:2d5b7c5b995e | 99 | return v; |
4180skrw | 4:2d5b7c5b995e | 100 | } |
4180skrw | 4:2d5b7c5b995e | 101 | |
4180skrw | 4:2d5b7c5b995e | 102 | void GPS::getline() { |
4180skrw | 4:2d5b7c5b995e | 103 | char c; |
4180skrw | 4:2d5b7c5b995e | 104 | while (c = _gps.getc() != '$'); // wait for the start of a line |
4180skrw | 4:2d5b7c5b995e | 105 | // printf("entered the getline loop\n\r"); |
4180skrw | 4:2d5b7c5b995e | 106 | for (int i=0; i<256; i++) { |
4180skrw | 4:2d5b7c5b995e | 107 | msg[i] = _gps.getc(); |
4180skrw | 4:2d5b7c5b995e | 108 | if (msg[i] == '\r') { |
4180skrw | 4:2d5b7c5b995e | 109 | msg[i] = 0; |
4180skrw | 4:2d5b7c5b995e | 110 | return; |
4180skrw | 4:2d5b7c5b995e | 111 | } |
4180skrw | 4:2d5b7c5b995e | 112 | } |
4180skrw | 4:2d5b7c5b995e | 113 | error("Overflowed message limit"); |
4180skrw | 4:2d5b7c5b995e | 114 | } |
4180skrw | 4:2d5b7c5b995e | 115 | |
4180skrw | 4:2d5b7c5b995e | 116 | /* |
4180skrw | 4:2d5b7c5b995e | 117 | $GPRMC,000115.039,V,,,,,,,291006,,*2C |
4180skrw | 4:2d5b7c5b995e | 118 | $GPGGA,000116.031,,,,,0,00,,,M,0.0,M,,0000*52 |
4180skrw | 4:2d5b7c5b995e | 119 | $GPGSA,A,1,,,,,,,,,,,,,,,*1E |
4180skrw | 4:2d5b7c5b995e | 120 | $GPGSV,3,1,12,20,00,000,,10,00,000,,31,00,000,,27,00,000,*7C |
4180skrw | 4:2d5b7c5b995e | 121 | $GPGSV,3,2,12,19,00,000,,07,00,000,,04,00,000,,24,00,000,*76 |
4180skrw | 4:2d5b7c5b995e | 122 | $GPGSV,3,3,12,16,00,000,,28,00,000,,26,00,000,,29,00,000,*78 |
4180skrw | 4:2d5b7c5b995e | 123 | $GPRMC,000116.031,V,,,,,,,291006,,*27 |
4180skrw | 4:2d5b7c5b995e | 124 | $GPGGA,000117.035,,,,,0,00,,,M,0.0,M,,0000*57 |
4180skrw | 4:2d5b7c5b995e | 125 | $GPGSA,A,1,,,,,,,,,,,,,,,*1E |
4180skrw | 4:2d5b7c5b995e | 126 | $GPRMC,000117.035,V,,,,,,,291006,,*22 |
4180skrw | 4:2d5b7c5b995e | 127 | $GPGGA,000118.039,,,,,0,00,,,M,0.0,M,,0000*54 |
4180skrw | 4:2d5b7c5b995e | 128 | $GPGSA,A,1,,,,,,,,,,,,,,,*1E |
4180skrw | 4:2d5b7c5b995e | 129 | $GPRMC,000118.039,V,,,,,,,291006,,*21 |
4180skrw | 4:2d5b7c5b995e | 130 | $GPGGA,000119.035,,,,,0,00,,,M,0.0,M,,0000*59 |
4180skrw | 4:2d5b7c5b995e | 131 | $GPGSA,A,1,,,,,,,,,,,,,,,*1E |
4180skrw | 4:2d5b7c5b995e | 132 | $GPRMC,000119.035,V,,,,,,,291006,,*2C |
4180skrw | 4:2d5b7c5b995e | 133 | $GPGGA,000120.037,,,,,0,00,,,M,0.0,M,,0000*51 |
4180skrw | 4:2d5b7c5b995e | 134 | $GPGSA,A,1,,,,,,,,,,,,,,,*1E |
4180skrw | 4:2d5b7c5b995e | 135 | $GPRMC,000120.037,V,,,,,,,291006,,*24 |
4180skrw | 4:2d5b7c5b995e | 136 | |
4180skrw | 4:2d5b7c5b995e | 137 | */ |