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/GPRMCdecoder.hpp
- Revision:
- 0:0c1aa5906cef
- Child:
- 3:20f8faf2ad18
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Decoders/GPRMCdecoder.hpp Wed Aug 06 01:37:39 2014 +0000
@@ -0,0 +1,49 @@
+#include "mbed.h"
+#include "mbedGPSDefs.h"
+
+void DecodeGPRMC(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){ //utc fix time
+ data.time.time[0] = *token;
+ data.time.time[1] = *(token+1);
+ data.time.time[2] = *(token+2);
+ data.time.time[3] = *(token+3);
+ data.time.time[4] = *(token+4);
+ data.time.time[5] = *(token+5);
+ data.time.time[6] = '\0'; //properly finish the string
+ data.time.hour = (data.time.time[0]-0x30)*10 + (data.time.time[1]-0x30);
+ data.time.min = (data.time.time[2]-0x30)*10 + (data.time.time[3]-0x30);
+ data.time.sec = (data.time.time[4]-0x30)*10 + (data.time.time[5]-0x30);
+ if(*(token+6) == '.')//check is sentence has ms precision, if so parse it
+ data.time.msec = (*(token+7)-0x30)*100 +(*(token+8)-0x30)*10 + (*(token+9)-0x30);
+ else
+ data.time.msec = 0;
+
+ }
+ if(parameterCount == 2){ //GPS fix status
+ data.GPSStatus = *token;
+ }
+ if(parameterCount == 9){ //fix date
+ data.date.date[0] = *token;
+ data.date.date[1] = *(token+1);
+ data.date.date[2] = *(token+2);
+ data.date.date[3] = *(token+3);
+ data.date.date[4] = *(token+4);
+ data.date.date[5] = *(token+5);
+ data.date.date[6] = '\0'; //properly finish the string
+ data.date.day = (data.date.date[0]-0x30)*10 + (data.date.date[1]-0x30);
+ data.date.month = (data.date.date[2]-0x30)*10 + (data.date.date[3]-0x30);;
+ data.date.year = (data.date.date[4]-0x30)*10 + (data.date.date[5]-0x30);;
+ }
+
+ parameterCount++;
+ ptr = rest; // rest contains the left over part..assign it to ptr.
+ token = strtok_r(ptr, ",",&rest);
+ }
+}
\ No newline at end of file