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

Committer:
chris215
Date:
Wed Aug 06 01:37:39 2014 +0000
Revision:
0:0c1aa5906cef
Child:
2:72ac4d7044a7
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
chris215 0:0c1aa5906cef 5
chris215 0:0c1aa5906cef 6 void DecodeGPGSA(char * tokenStr,GPSInfo& data)
chris215 0:0c1aa5906cef 7 {
chris215 0:0c1aa5906cef 8 int parameterCount = 0;
chris215 0:0c1aa5906cef 9 char *rest; // to point to the rest of the string after token extraction.
chris215 0:0c1aa5906cef 10 char *token; // to point to the actual token returned.
chris215 0:0c1aa5906cef 11 char *ptr = tokenStr; // make q point to start of hello.
chris215 0:0c1aa5906cef 12 token = strtok_r(ptr, ",",&rest);
chris215 0:0c1aa5906cef 13 while (token != NULL)
chris215 0:0c1aa5906cef 14 {
chris215 0:0c1aa5906cef 15 //printf("DEBUG ... PARAM_CNT:%d\n",parameterCount);
chris215 0:0c1aa5906cef 16 if(parameterCount == 1)
chris215 0:0c1aa5906cef 17 data.mode = *token;
chris215 0:0c1aa5906cef 18
chris215 0:0c1aa5906cef 19 if(parameterCount == 2){
chris215 0:0c1aa5906cef 20 data.fix = atoi(token);
chris215 0:0c1aa5906cef 21 }
chris215 0:0c1aa5906cef 22
chris215 0:0c1aa5906cef 23 if(parameterCount == (3 + data.TrackedSatCnt)){
chris215 0:0c1aa5906cef 24 data.PDOP = atof(token);
chris215 0:0c1aa5906cef 25 //printf("DEBUG ... PDOP:%f\n",data.PDOP);
chris215 0:0c1aa5906cef 26 }
chris215 0:0c1aa5906cef 27 if(parameterCount == (3 + data.TrackedSatCnt + 1)){
chris215 0:0c1aa5906cef 28 data.HDOP = atof(token);
chris215 0:0c1aa5906cef 29 //printf("DEBUG ... HDOP:%f\n",data.HDOP);
chris215 0:0c1aa5906cef 30 }
chris215 0:0c1aa5906cef 31 if(parameterCount == (3 + data.TrackedSatCnt + 2)){
chris215 0:0c1aa5906cef 32 data.VDOP = atof(token);
chris215 0:0c1aa5906cef 33 //printf("DEBUG ... VDOP:%f\n",data.VDOP);
chris215 0:0c1aa5906cef 34 }
chris215 0:0c1aa5906cef 35 parameterCount++;
chris215 0:0c1aa5906cef 36 ptr = rest; // rest contains the left over part..assign it to ptr.
chris215 0:0c1aa5906cef 37 token = strtok_r(ptr, ",",&rest);
chris215 0:0c1aa5906cef 38 }
chris215 0:0c1aa5906cef 39 }