Updated
Fork of GPS by
GPS.cpp
- Committer:
- canterol
- Date:
- 2014-11-18
- Revision:
- 2:233e5e68fbfb
- Parent:
- 1:1d60e6a0ffd9
File content as of revision 2:233e5e68fbfb:
/* * mbed GPS Module Library * Copyright (c) 2008-2010, sford * Copyright (c) 2013, B.Adryan * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * Modified by: Ben Wallace * Modification Date: 10/20/2014 * GPS Module: Adafruit Ultimate GPS V3 * uController: LPC1768 */ #include "GPS.h" GPS::GPS(PinName tx, PinName rx, int Baud) : _gps(tx, rx) { _gps.baud(Baud); longitude = 0.0; latitude = 0.0; } int GPS::sample() { char ns, ew, unit; int lock; float degrees; float minutes; while(1) { getline(); // Check if it is a GPGGA msg (matches both locked and non-locked msg) 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) { if(!lock) { time = 0.0; longitude = 0.0; latitude = 0.0; sats = 0; hdop = 0.0; alt = 0.0; geoid = 0.0; return 0; } else { //GPGGA format according http://aprs.gids.nl/nmea/#gga // time (float), lat (f), (N/S) (c), long (f), (E/W) (c), fix (d), sats (d), // hdop (float), altitude (float), M, geoid (float), M, , , //GPGGA,092010.000,5210.9546,N,00008.8913,E,1,07,1.3,9.7,M,47.0,M,,0000*5D minutes = fmod((double)latitude, 100.0); //Modulate by 100.0 to convert dddmm.mmmm to mm.mmmm minutes /= 60.0; //Convert minutes to degrees (1 degree = 60 minutes) degrees = ((int)latitude / 100); //Divide by 100 and truncate to convert dddmm.mmmm to ddd.000000 latitude = degrees + minutes; //Combine degrees and minutes into a single degree value minutes = fmod((double)longitude, 100.0); //Modulate by 100.0 to convert dddmm.mmmm to mm.mmmm minutes /= 60.0; //Convert minutes to degrees (1 degree = 60 minutes) degrees = ((int)longitude / 100); //Divide by 100 and truncate to convert dddmm.mmmm to ddd.000000 longitude = degrees + minutes; //Combine degrees and minutes into a single degree value //If the latitude is designated 'South" then multiply the latitude by -1.0 if(ns == 'S') { latitude *= -1.0; } //If the longitude is designated 'West" then multiply the longitude by -1.0 if(ew == 'W') { longitude *= -1.0; } return 1; } } } } float GPS::trunc(float v) { if(v < 0.0) { v*= -1.0; v = floor(v); v*=-1.0; } else { v = floor(v); } return v; } void GPS::getline() { while(_gps.getc() != '$'); // wait for the start of a line for(int i=0; i<256; i++) { msg[i] = _gps.getc(); if(msg[i] == '\r') { msg[i] = 0; return; } } error("Overflowed message limit"); }