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/GPGSAdecoder.hpp
- Revision:
- 0:0c1aa5906cef
- Child:
- 2:72ac4d7044a7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Decoders/GPGSAdecoder.hpp Wed Aug 06 01:37:39 2014 +0000
@@ -0,0 +1,39 @@
+#include "mbed.h"
+#include "mbedGPSDefs.h"
+
+
+
+void DecodeGPGSA(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)
+ {
+ //printf("DEBUG ... PARAM_CNT:%d\n",parameterCount);
+ if(parameterCount == 1)
+ data.mode = *token;
+
+ if(parameterCount == 2){
+ data.fix = atoi(token);
+ }
+
+ if(parameterCount == (3 + data.TrackedSatCnt)){
+ data.PDOP = atof(token);
+ //printf("DEBUG ... PDOP:%f\n",data.PDOP);
+ }
+ if(parameterCount == (3 + data.TrackedSatCnt + 1)){
+ data.HDOP = atof(token);
+ //printf("DEBUG ... HDOP:%f\n",data.HDOP);
+ }
+ if(parameterCount == (3 + data.TrackedSatCnt + 2)){
+ data.VDOP = atof(token);
+ //printf("DEBUG ... VDOP:%f\n",data.VDOP);
+ }
+ parameterCount++;
+ ptr = rest; // rest contains the left over part..assign it to ptr.
+ token = strtok_r(ptr, ",",&rest);
+ }
+}
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