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.

Diff: utils/GPSUtils.hpp

Revision:
2:72ac4d7044a7
Parent:
1:fade122a76a8
Child:
3:20f8faf2ad18
diff -r fade122a76a8 -r 72ac4d7044a7 utils/GPSUtils.hpp
--- a/utils/GPSUtils.hpp	Mon Apr 06 17:41:43 2015 +0000
+++ b/utils/GPSUtils.hpp	Sun Feb 14 05:55:38 2016 +0000
@@ -15,11 +15,41 @@
 //298.257223563
 #define WGS84_E     0.081819190842621
 
-
 /*
     Source of information about nema sentences :
     http://www.gpsinformation.org/dale/nmea.htm
 */
+int CheckForHeader(char* DataToCheck, char* RefData,int datasize);
+int IdentifyGPSMessage(message& GPSMessageToIdentify)
+{
+    if(CheckForHeader(GPSMessageToIdentify.data,GPS_CMD_GPGGA,6))
+    {
+        return GPS_GPGGAR;
+    }
+    else if(CheckForHeader(GPSMessageToIdentify.data,GPS_CMD_GPVTG,6))
+    {
+        return GPS_GPVTGR;
+    }
+    else if(CheckForHeader(GPSMessageToIdentify.data,GPS_CMD_GPGSA,6))
+    {
+        return GPS_GPGSAR;
+    }
+    else if(CheckForHeader(GPSMessageToIdentify.data,GPS_CMD_GPRMC,6))
+    {
+        return GPS_GPRMCR;
+    }
+    return 0;     
+}
+
+int CheckForHeader(char* DataToCheck, char* RefData,int datasize)
+{
+    int NumberOfMatchingElements = memcmp(DataToCheck,RefData,datasize);
+             
+    if(NumberOfMatchingElements==0)
+        return 1;
+    return 0;
+}
+
 void DecodeMessage(message& msg,GPSInfo& data)
 {