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@3:20f8faf2ad18, 2016-02-15 (annotated)

Committer:
chris215
Date:
Mon Feb 15 00:42:32 2016 +0000
Revision:
3:20f8faf2ad18
Parent:
0:0c1aa5906cef 
Code refactor. Replace usage of strtok_r() with a custom version to fix parsing issues when the token is empty.

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 3:20f8faf2ad18 3 #include "DecodersUtils.h"
chris215 0:0c1aa5906cef 4
chris215 0:0c1aa5906cef 5 void DecodeGPGGA(char * tokenStr,GPSInfo& data)
chris215 0:0c1aa5906cef 6 {
chris215 0:0c1aa5906cef 7 int parameterCount = 0;
chris215 0:0c1aa5906cef 8 char *rest; // to point to the rest of the string after token extraction.
chris215 0:0c1aa5906cef 9 char *token; // to point to the actual token returned.
chris215 0:0c1aa5906cef 10 char *ptr = tokenStr; // make q point to start of hello.
chris215 3:20f8faf2ad18 11 //token = strtok_r(ptr, ",",&rest);
chris215 3:20f8faf2ad18 12 token = strtok_single(ptr, ",");
chris215 0:0c1aa5906cef 13 while (token != NULL)
chris215 0:0c1aa5906cef 14 {
chris215 0:0c1aa5906cef 15 if(parameterCount == 1)
chris215 0:0c1aa5906cef 16 data.GPStime = atof(token);
chris215 0:0c1aa5906cef 17
chris215 0:0c1aa5906cef 18 if(parameterCount == 2)
chris215 0:0c1aa5906cef 19 data.latitude = atof(token);
chris215 0:0c1aa5906cef 20
chris215 0:0c1aa5906cef 21 if(parameterCount == 3)
chris215 0:0c1aa5906cef 22 data.latLoc = *token;
chris215 0:0c1aa5906cef 23
chris215 0:0c1aa5906cef 24 if(parameterCount == 4)
chris215 0:0c1aa5906cef 25 data.longitude = atof(token);
chris215 0:0c1aa5906cef 26
chris215 0:0c1aa5906cef 27 if(parameterCount == 5)
chris215 0:0c1aa5906cef 28 data.lonLoc = *token;
chris215 0:0c1aa5906cef 29
chris215 0:0c1aa5906cef 30 if(parameterCount == 6)
chris215 0:0c1aa5906cef 31 data.FixQal = atoi(token);
chris215 0:0c1aa5906cef 32
chris215 0:0c1aa5906cef 33 if(parameterCount == 7)
chris215 0:0c1aa5906cef 34 data.TrackedSatCnt = atoi(token);
chris215 0:0c1aa5906cef 35
chris215 0:0c1aa5906cef 36 if(parameterCount == 8)
chris215 0:0c1aa5906cef 37 data.HDOP = atof(token);
chris215 0:0c1aa5906cef 38
chris215 0:0c1aa5906cef 39 if(parameterCount == 9)
chris215 0:0c1aa5906cef 40 data.GPSAltitude = atof(token);
chris215 0:0c1aa5906cef 41
chris215 0:0c1aa5906cef 42 if(parameterCount == 11)
chris215 0:0c1aa5906cef 43 data.GEOIDHeight = atof(token);
chris215 0:0c1aa5906cef 44
chris215 0:0c1aa5906cef 45 parameterCount++;
chris215 0:0c1aa5906cef 46 ptr = rest; // rest contains the left over part..assign it to ptr.
chris215 3:20f8faf2ad18 47 //token = strtok_r(ptr, ",",&rest);
chris215 3:20f8faf2ad18 48 token = strtok_single(NULL, ",");
chris215 0:0c1aa5906cef 49 }
chris215 0:0c1aa5906cef 50 /*printf("Time:%lf\n",data.GPStime);
chris215 0:0c1aa5906cef 51 printf("Latitude:%4.4lf\n",data.latitude);
chris215 0:0c1aa5906cef 52 printf("Longitude:%4.4lf\n",data.longitude);
chris215 0:0c1aa5906cef 53 printf("GPS FIX:%d\n",data.GPSFix);
chris215 0:0c1aa5906cef 54 printf("GPS Altitude:%f\n",data.GPSAltitude);
chris215 0:0c1aa5906cef 55 printf("GPS Geoide Heigth:%f\n",data.GEOIDHeight);*/
chris215 0:0c1aa5906cef 56
chris215 0:0c1aa5906cef 57 }