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:
2016-02-15
Revision:
3:20f8faf2ad18
Parent:
0:0c1aa5906cef
Child:
4:d911d7c4e09d

File content as of revision 3:20f8faf2ad18:

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



void DecodeGPVTG(char * tokenStr,GPSInfo& data)
{
    //pc.printf("VTGDecoder debug: %s\n\r",tokenStr);
    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_single(ptr, ",");
    token = strtok_single(ptr, ",");
    while (token != NULL)
    {
        //pc.printf("%d:%s ",parameterCount,token);
        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);
        token = strtok_single(NULL, ",");
    }
    //pc.printf("\n\r");
}