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");
}