nmea.h

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/**
 *
 * https://github.com/wdalmut/libgps/tree/develop/src
 *
 */
 
#pragma once
 
#include "rusefi_types.h"
 
#define GPS_MAX_STRING 256
 
typedef enum {
    NMEA_UNKNOWN = 0x00,
    NMEA_GPRMC = 0x01,
    NMEA_GPGGA = 0x02
} nmea_message_type;
 
#define _EMPTY 0x00
#define NMEA_GPRMC_STR "$GPRMC"
#define NMEA_GPGGA_STR "$GPGGA"
#define _COMPLETED 0x03
 
#define NMEA_CHECKSUM_ERR 0x80
#define NMEA_MESSAGE_ERR 0xC0
 
struct GPSlocation {
    float latitude;
    float longitude;
    float speed;
    float altitude;
    float course;
    efidatetime_t time;
    nmea_message_type type;
    int quality;
    int satellites;
    char lat;       // Northing Indicator           N=North, S=South
    char lon;       // Easting Indicator            E=East, W=West
};
typedef struct GPSlocation loc_t;
 
nmea_message_type nmea_get_message_type(const char *);
int nmea_valid_checksum(const char *);
 
 
void gps_location(loc_t *, char const * const);
 
static int str2int(const char * a, const int len) {
    int i = 0,  k = 0;
    while (i < len) {
        k = (k << 3) + (k << 1) + (*a) - '0';
        a++;
        i++;
    }
    return k;
}