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/GPVTGdecoder.hpp

Committer:
chris215
Date:
2014-08-06
Revision:
0:0c1aa5906cef
Child:
3:20f8faf2ad18

File content as of revision 0:0c1aa5906cef:

#include "mbed.h"
#include "mbedGPSDefs.h"

void DecodeGPVTG(char * tokenStr,GPSInfo& data)
{
    int parameterCount = 0;
    char *rest; // to point to the rest of the string after token extraction.
    char *token; // to point to the actual token returned.
    char *ptr = tokenStr; // make q point to start of hello.
    token = strtok_r(ptr, ",",&rest);
    while (token != NULL)
    {
        if(parameterCount == 1)
            data.TrueTrack = atof(token);
            
        if(parameterCount == 3)
            data.MagneticTrack = atof(token);
            
        if(parameterCount == 5)
            data.GroundSpeedN = atof(token);
            
        if(parameterCount == 7)
            data.GroundSpeedK = atof(token);
            
        parameterCount++;
        ptr = rest; // rest contains the left over part..assign it to ptr.
        token = strtok_r(ptr, ",",&rest);
    }
}