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/* gpsd.h -- fundamental types and structures for the GPS daemon */
#define BUFSIZE 4096 /* longer than longest NMEA sentence (82) */
struct longlat_t
/* This structure is used to initialize some older GPS units */
{
char *latitude;
char *longitude;
char latd;
char lond;
};
struct gps_session_t;
struct gps_type_t
/* GPS method table, describes how to talk to a particular GPS type */
{
char typekey, *typename;
char *trigger;
void (*initializer)(struct gps_session_t *session);
int (*handle_input)(struct gps_session_t *session);
int (*rtcm_writer)(struct gps_session_t *session, char *rtcmbuf, int rtcmbytes);
void (*wrapup)(struct gps_session_t *session);
int baudrate;
int interval;
};
struct gps_session_t
/* session object, encapsulates all global state */
{
struct gps_type_t *device_type;
struct longlat_t initpos;
struct gps_data_t gNMEAdata;
char *gpsd_device; /* where to find the GPS */
int baudrate; /* baud rate of session */
int fdin; /* input fd from GPS */
int fdout; /* output fd to GPS */
int dsock; /* socket to DGPS server */
int sentdgps; /* have we sent a DGPS correction? */
int fixcnt; /* count of good fixes seen */
/* private housekeeping stuff for the Earthmate driver */
double mag_var; /* Magnetic variation in degrees */
int year;
int month;
int day;
int hours;
int minutes;
int seconds;
};
/* some multipliers for interpreting GPS output */
#define METERS_TO_FEET 3.2808399
#define METERS_TO_MILES 0.00062137119
#define KNOTS_TO_MPH 1.1507794
#define GPGLL "$GPGLL"
#define GPVTG "$GPVTG"
#define GPGGA "$GPGGA"
#define GPGSA "$GPGSA"
#define GPGSV "$GPGSV"
#define GPRMC "$GPRMC"
#define PRWIZCH "$PRWIZCH"
#define PMGNST "$PMGNST"
/* here are the available GPS drivers */
extern struct gps_type_t nmea;
extern struct gps_type_t tripmate;
extern struct gps_type_t earthmate_a;
extern struct gps_type_t earthmate_b;
extern struct gps_type_t logfile;
extern struct gps_type_t *gpsd_drivers[5];
/* GPS library internal prototypes */
extern int nmea_parse(char *sentence, struct gps_data_t *outdata);
extern int nmea_sane_satellites(struct gps_data_t *out);
extern void gpsd_NMEA_handle_message(struct gps_session_t *session, char *sentence);
extern void nmea_add_checksum(char *sentence);
extern short nmea_checksum(char *sentence);
extern int gpsd_open(char *device_name, int device_speed);
extern void gpsd_close();
extern int netlib_connectsock(char *host, char *service, char *protocol);
/* External interface */
extern struct gps_session_t * gpsd_init(char devtype, char *dgpsserver);
extern int gpsd_activate(struct gps_session_t *session);
extern void gpsd_deactivate(struct gps_session_t *session);
extern int gpsd_poll(struct gps_session_t *session);
extern void gpsd_wrap(struct gps_session_t *session);
/* caller must supply this */
void gpscli_report(int d, const char *fmt, ...);
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