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@2:72ac4d7044a7, 2016-02-14 (annotated)

Committer:
chris215
Date:
Sun Feb 14 05:55:38 2016 +0000
Revision:
2:72ac4d7044a7
Parent:
0:0c1aa5906cef
Child:
3:20f8faf2ad18
Modified librairy to increase performance. Reduced interrupt overhead by removing most of the nema parsing.

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 DecodeGPGSA(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 2:72ac4d7044a7 13 //Debuging.printf("DEBUG ... PARAM_CNT:%d\n",parameterCount);
chris215 0:0c1aa5906cef 14 if(parameterCount == 1)
chris215 0:0c1aa5906cef 15 data.mode = *token;
chris215 0:0c1aa5906cef 16
chris215 0:0c1aa5906cef 17 if(parameterCount == 2){
chris215 0:0c1aa5906cef 18 data.fix = atoi(token);
chris215 0:0c1aa5906cef 19 }
chris215 0:0c1aa5906cef 20
chris215 0:0c1aa5906cef 21 if(parameterCount == (3 + data.TrackedSatCnt)){
chris215 0:0c1aa5906cef 22 data.PDOP = atof(token);
chris215 2:72ac4d7044a7 23 //Debuging.printf("DEBUG ... PDOP:%f\n",data.PDOP);
chris215 0:0c1aa5906cef 24 }
chris215 0:0c1aa5906cef 25 if(parameterCount == (3 + data.TrackedSatCnt + 1)){
chris215 0:0c1aa5906cef 26 data.HDOP = atof(token);
chris215 0:0c1aa5906cef 27 //printf("DEBUG ... HDOP:%f\n",data.HDOP);
chris215 0:0c1aa5906cef 28 }
chris215 0:0c1aa5906cef 29 if(parameterCount == (3 + data.TrackedSatCnt + 2)){
chris215 0:0c1aa5906cef 30 data.VDOP = atof(token);
chris215 0:0c1aa5906cef 31 //printf("DEBUG ... VDOP:%f\n",data.VDOP);
chris215 0:0c1aa5906cef 32 }
chris215 0:0c1aa5906cef 33 parameterCount++;
chris215 0:0c1aa5906cef 34 ptr = rest; // rest contains the left over part..assign it to ptr.
chris215 0:0c1aa5906cef 35 token = strtok_r(ptr, ",",&rest);
chris215 0:0c1aa5906cef 36 }
chris215 0:0c1aa5906cef 37 }