christian b / GPS

Mbed library to handle GPS data reception and parsing

Dependents:   GPS_U-blox_NEO-6M_Code

Features

  • All positionning parameters are contained into a global data structure.
  • Automatic nema string parsing and data structure update.
    • GSA,GGA,VTG and RMC
  • Convert latitude and longitude to decimal value.
  • Converts latittude,longitude and altitude to ECEF coordinates.

Planed developement

  • Test library for RTOS use.
  • Complete the nema parsing decoders (couple of parameters are not parsed yet and not present in the data structure).
  • Add conversion tool to get ENU coordinates.

Decoders/GPGGAdecoder.hpp@0:0c1aa5906cef, 2014-08-06 (annotated)

Committer:
chris215
Date:
Wed Aug 06 01:37:39 2014 +0000
Revision:
0:0c1aa5906cef
Child:
3:20f8faf2ad18
Renamed library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
chris215 0:0c1aa5906cef 1 #include "mbed.h"
chris215 0:0c1aa5906cef 2 #include "mbedGPSDefs.h"
chris215 0:0c1aa5906cef 3
chris215 0:0c1aa5906cef 4 void DecodeGPGGA(char * tokenStr,GPSInfo& data)
chris215 0:0c1aa5906cef 5 {
chris215 0:0c1aa5906cef 6 int parameterCount = 0;
chris215 0:0c1aa5906cef 7 char *rest; // to point to the rest of the string after token extraction.
chris215 0:0c1aa5906cef 8 char *token; // to point to the actual token returned.
chris215 0:0c1aa5906cef 9 char *ptr = tokenStr; // make q point to start of hello.
chris215 0:0c1aa5906cef 10 token = strtok_r(ptr, ",",&rest);
chris215 0:0c1aa5906cef 11 while (token != NULL)
chris215 0:0c1aa5906cef 12 {
chris215 0:0c1aa5906cef 13 if(parameterCount == 1)
chris215 0:0c1aa5906cef 14 data.GPStime = atof(token);
chris215 0:0c1aa5906cef 15
chris215 0:0c1aa5906cef 16 if(parameterCount == 2)
chris215 0:0c1aa5906cef 17 data.latitude = atof(token);
chris215 0:0c1aa5906cef 18
chris215 0:0c1aa5906cef 19 if(parameterCount == 3)
chris215 0:0c1aa5906cef 20 data.latLoc = *token;
chris215 0:0c1aa5906cef 21
chris215 0:0c1aa5906cef 22 if(parameterCount == 4)
chris215 0:0c1aa5906cef 23 data.longitude = atof(token);
chris215 0:0c1aa5906cef 24
chris215 0:0c1aa5906cef 25 if(parameterCount == 5)
chris215 0:0c1aa5906cef 26 data.lonLoc = *token;
chris215 0:0c1aa5906cef 27
chris215 0:0c1aa5906cef 28 if(parameterCount == 6)
chris215 0:0c1aa5906cef 29 data.FixQal = atoi(token);
chris215 0:0c1aa5906cef 30
chris215 0:0c1aa5906cef 31 if(parameterCount == 7)
chris215 0:0c1aa5906cef 32 data.TrackedSatCnt = atoi(token);
chris215 0:0c1aa5906cef 33
chris215 0:0c1aa5906cef 34 if(parameterCount == 8)
chris215 0:0c1aa5906cef 35 data.HDOP = atof(token);
chris215 0:0c1aa5906cef 36
chris215 0:0c1aa5906cef 37 if(parameterCount == 9)
chris215 0:0c1aa5906cef 38 data.GPSAltitude = atof(token);
chris215 0:0c1aa5906cef 39
chris215 0:0c1aa5906cef 40 if(parameterCount == 11)
chris215 0:0c1aa5906cef 41 data.GEOIDHeight = atof(token);
chris215 0:0c1aa5906cef 42
chris215 0:0c1aa5906cef 43 parameterCount++;
chris215 0:0c1aa5906cef 44 ptr = rest; // rest contains the left over part..assign it to ptr.
chris215 0:0c1aa5906cef 45 token = strtok_r(ptr, ",",&rest);
chris215 0:0c1aa5906cef 46 }
chris215 0:0c1aa5906cef 47 /*printf("Time:%lf\n",data.GPStime);
chris215 0:0c1aa5906cef 48 printf("Latitude:%4.4lf\n",data.latitude);
chris215 0:0c1aa5906cef 49 printf("Longitude:%4.4lf\n",data.longitude);
chris215 0:0c1aa5906cef 50 printf("GPS FIX:%d\n",data.GPSFix);
chris215 0:0c1aa5906cef 51 printf("GPS Altitude:%f\n",data.GPSAltitude);
chris215 0:0c1aa5906cef 52 printf("GPS Geoide Heigth:%f\n",data.GEOIDHeight);*/
chris215 0:0c1aa5906cef 53
chris215 0:0c1aa5906cef 54 }