GPS Tweeter program that tweets the device's GPS location every 5 minutes.
Dependencies: EthernetNetIf HTTPClient mbed
Fork of TwitterExample by
GPS.cpp
00001 /* mbed EM-406 GPS Module Library 00002 * Copyright (c) 2008-2010, sford 00003 * 00004 * Permission is hereby granted, free of charge, to any person obtaining a copy 00005 * of this software and associated documentation files (the "Software"), to deal 00006 * in the Software without restriction, including without limitation the rights 00007 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 * copies of the Software, and to permit persons to whom the Software is 00009 * furnished to do so, subject to the following conditions: 00010 * 00011 * The above copyright notice and this permission notice shall be included in 00012 * all copies or substantial portions of the Software. 00013 * 00014 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00020 * THE SOFTWARE. 00021 */ 00022 00023 #include "GPS.h" 00024 00025 GPS::GPS(PinName tx, PinName rx) : _gps(tx, rx) { 00026 _gps.baud(4800); 00027 longitude = 0.0; 00028 latitude = 0.0; 00029 } 00030 00031 int GPS::sample() { 00032 float time; 00033 char ns, ew; 00034 int lock; 00035 00036 //return 1; //testing by Jigar 00037 while (1) { 00038 getline(); 00039 //printf("\n\rentered the GPS.sample while loop \n\r %s\n\r", msg); 00040 00041 00042 // Check if it is a GPGGA msg (matches both locked and non-locked msg) 00043 // $GPGGA,000116.031,,,,,0,00,,,M,0.0,M,,0000*52 00044 /* 00045 eg3. $GPGGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh 00046 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 00047 1 = UTC of Position 00048 2 = Latitude 00049 3 = N or S 00050 4 = Longitude 00051 5 = E or W 00052 6 = GPS quality indicator (0=invalid; 1=GPS fix; 2=Diff. GPS fix) 00053 7 = Number of satellites in use [not those in view] 00054 8 = Horizontal dilution of position 00055 9 = Antenna altitude above/below mean sea level (geoid) 00056 10 = Meters (Antenna height unit) 00057 11 = Geoidal separation (Diff. between WGS-84 earth ellipsoid and 00058 mean sea level. -=geoid is below WGS-84 ellipsoid) 00059 12 = Meters (Units of geoidal separation) 00060 13 = Age in seconds since last update from diff. reference station 00061 14 = Diff. reference station ID# 00062 15 = Checksum 00063 00064 */ 00065 // if (sscanf(msg, "GPGGA,%f,%f,%c,%f,%c,%*d,%*d, %*f,%*f,%*f,%*f,%*f,%*f,%d ", &time, &latitude, &ns, &longitude, &ew, &lock) >= 1) { 00066 if(sscanf(msg, "GPGGA,%f,%f,%c,%f,%c,%d", &time, &latitude, &ns, &longitude, &ew, &lock) >= 1) { 00067 00068 if (!lock) { 00069 longitude = 0.0; 00070 latitude = 0.0; 00071 return 0; 00072 } else { 00073 if (ns == 'S') { 00074 latitude *= -1.0; 00075 } 00076 if (ew == 'W') { 00077 longitude *= -1.0; 00078 } 00079 float degrees = trunc(latitude / 100.0f); 00080 float minutes = latitude - (degrees * 100.0f); 00081 latitude = degrees + minutes / 60.0f; 00082 degrees = trunc(longitude / 100.0f ); //degrees = trunc(longitude / 100.0f * 0.01f); 00083 minutes = longitude - (degrees * 100.0f); 00084 longitude = degrees + minutes / 60.0f; 00085 return 1; 00086 } 00087 } 00088 } 00089 } 00090 00091 float GPS::trunc(float v) { 00092 if (v < 0.0) { 00093 v*= -1.0; 00094 v = floor(v); 00095 v*=-1.0; 00096 } else { 00097 v = floor(v); 00098 } 00099 return v; 00100 } 00101 00102 void GPS::getline() { 00103 char c; 00104 while (c = _gps.getc() != '$'); // wait for the start of a line 00105 // printf("entered the getline loop\n\r"); 00106 for (int i=0; i<256; i++) { 00107 msg[i] = _gps.getc(); 00108 if (msg[i] == '\r') { 00109 msg[i] = 0; 00110 return; 00111 } 00112 } 00113 error("Overflowed message limit"); 00114 } 00115 00116 /* 00117 $GPRMC,000115.039,V,,,,,,,291006,,*2C 00118 $GPGGA,000116.031,,,,,0,00,,,M,0.0,M,,0000*52 00119 $GPGSA,A,1,,,,,,,,,,,,,,,*1E 00120 $GPGSV,3,1,12,20,00,000,,10,00,000,,31,00,000,,27,00,000,*7C 00121 $GPGSV,3,2,12,19,00,000,,07,00,000,,04,00,000,,24,00,000,*76 00122 $GPGSV,3,3,12,16,00,000,,28,00,000,,26,00,000,,29,00,000,*78 00123 $GPRMC,000116.031,V,,,,,,,291006,,*27 00124 $GPGGA,000117.035,,,,,0,00,,,M,0.0,M,,0000*57 00125 $GPGSA,A,1,,,,,,,,,,,,,,,*1E 00126 $GPRMC,000117.035,V,,,,,,,291006,,*22 00127 $GPGGA,000118.039,,,,,0,00,,,M,0.0,M,,0000*54 00128 $GPGSA,A,1,,,,,,,,,,,,,,,*1E 00129 $GPRMC,000118.039,V,,,,,,,291006,,*21 00130 $GPGGA,000119.035,,,,,0,00,,,M,0.0,M,,0000*59 00131 $GPGSA,A,1,,,,,,,,,,,,,,,*1E 00132 $GPRMC,000119.035,V,,,,,,,291006,,*2C 00133 $GPGGA,000120.037,,,,,0,00,,,M,0.0,M,,0000*51 00134 $GPGSA,A,1,,,,,,,,,,,,,,,*1E 00135 $GPRMC,000120.037,V,,,,,,,291006,,*24 00136 00137 */
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