Diff: GPS_parser.h

Revision:

5:94daced1e61a

Child:

6:4ed12067a314

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/GPS_parser.h	Wed Dec 12 17:32:31 2012 +0000
@@ -0,0 +1,84 @@
+#include "mbed.h"
+
+#ifndef MBED_GPS_PARSER_H
+#define MBED_GPS_PARSER_H
+
+#define NO_LOCK     1
+#define NOT_PARSED  2
+#define GGA         3
+#define GLL         4
+#define RMC         5
+#define VTG         6
+
+#define PI (3.141592653589793)
+
+/**  A GPS_parser interface for reading from a Globalsat EM-406 GPS Module */
+class GPS_Parser {
+public:
+
+    GPS_Parser();
+    
+    /** Sample the incoming GPS data, returning whether there is a lock
+     * 
+     * @return 1 if there was a lock when the sample was taken (and therefore .longitude and .latitude are valid), else 0
+     */
+    int sample(char *);
+    float get_nmea_longitude();
+    float get_nmea_latitude();
+    float get_dec_longitude();
+    float get_dec_latitude();
+    float get_msl_altitude();
+    float get_course_t();
+    float get_course_m();
+    float get_speed_k();
+    float get_speed_km();
+    int get_satelites();
+    float get_altitude_ft();
+    
+    // navigational functions
+    float calc_course_to(float, float);
+    double calc_dist_to_mi(float, float);
+    double calc_dist_to_ft(float, float);
+    double calc_dist_to_km(float, float);
+    double calc_dist_to_m(float, float);
+    
+private:
+    float nmea_to_dec(float, char);
+    float trunc(float v);
+    
+    // calculated values
+    volatile float dec_longitude;
+    volatile float dec_latitude;
+    volatile float altitude_ft;
+    
+    // GGA - Global Positioning System Fixed Data
+    volatile float nmea_longitude;
+    volatile float nmea_latitude;    
+    volatile float utc_time;
+    volatile char ns, ew;
+    volatile int lock;
+    volatile int satelites;
+    volatile float hdop;
+    volatile float msl_altitude;
+    volatile char msl_units;
+    
+    // RMC - Recommended Minimmum Specific GNS Data
+    volatile char rmc_status;
+    volatile float speed_k;
+    volatile float course_d;
+    volatile int date;
+    
+    // GLL
+    volatile char gll_status;
+    
+    // VTG - Course over ground, ground speed
+    volatile float course_t; // ground speed true
+    volatile char course_t_unit;
+    volatile float course_m; // magnetic
+    volatile char course_m_unit;
+    volatile char speed_k_unit;
+    volatile float speed_km; // speek km/hr
+    volatile char speed_km_unit;
+};
+
+#endif