christian b
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: Decoders/GPGGAdecoder.hpp
- Revision:
- 0:0c1aa5906cef
- Child:
- 3:20f8faf2ad18
diff -r 000000000000 -r 0c1aa5906cef Decoders/GPGGAdecoder.hpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Decoders/GPGGAdecoder.hpp Wed Aug 06 01:37:39 2014 +0000
@@ -0,0 +1,54 @@
+#include "mbed.h"
+#include "mbedGPSDefs.h"
+
+void DecodeGPGGA(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.GPStime = atof(token);
+
+ if(parameterCount == 2)
+ data.latitude = atof(token);
+
+ if(parameterCount == 3)
+ data.latLoc = *token;
+
+ if(parameterCount == 4)
+ data.longitude = atof(token);
+
+ if(parameterCount == 5)
+ data.lonLoc = *token;
+
+ if(parameterCount == 6)
+ data.FixQal = atoi(token);
+
+ if(parameterCount == 7)
+ data.TrackedSatCnt = atoi(token);
+
+ if(parameterCount == 8)
+ data.HDOP = atof(token);
+
+ if(parameterCount == 9)
+ data.GPSAltitude = atof(token);
+
+ if(parameterCount == 11)
+ data.GEOIDHeight = atof(token);
+
+ parameterCount++;
+ ptr = rest; // rest contains the left over part..assign it to ptr.
+ token = strtok_r(ptr, ",",&rest);
+ }
+ /*printf("Time:%lf\n",data.GPStime);
+ printf("Latitude:%4.4lf\n",data.latitude);
+ printf("Longitude:%4.4lf\n",data.longitude);
+ printf("GPS FIX:%d\n",data.GPSFix);
+ printf("GPS Altitude:%f\n",data.GPSAltitude);
+ printf("GPS Geoide Heigth:%f\n",data.GEOIDHeight);*/
+
+}
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