gnss/1.0/IGnssDebug.hal

package android.hardware.gnss@1.0;

/* Extended interface for DEBUG support. */
interface IGnssDebug {
    enum SatelliteEphemerisType : uint8_t {
        /* no information is known to the gnss hardware, about this satellite */
        UNKNOWN,
        /*  this satellite is known to exist */
        KNOWN,
        /*  this satellite is not known to exist */
        NONEXISTENT,
        /* Only Almanac (approximate) location known for this satellite */
        ALMANAC_ONLY,
        /* Ephemeris is known from demodulating the signal on device */
        DEMODULATED,
        /* Ephemeris has been provided by SUPL */
        SUPL_PROVIDED,
        /* Ephemeris has been provided by another server */
        OTHER_SERVER_PROVIDED,
        /*
         * Predicted ephemeris has been provided by a server
         * (e.g. Xtra, Extended Ephemeris, etc...)
         */
        SERVER_PREDICTED,
        /*
         * Predicted ephemeris in use, generated locally on the device (e.g. from prior
         * ephemeris)
         */
        LOCALLY_PREDICTED
    };

    /*
     * Provides the current best known position from any
     * source (GNSS or injected assistance).
     */
    struct PositionDebug {
        /*
         * Validity of the data in this struct. False only if no
         * latitude/longitude information is known.
         */
        bool valid;
        /* Latitude expressed in degrees */
        double latitudeDegrees;
        /* Longitude expressed in degrees */
        double longitudeDegrees;
        /* Altitude above ellipsoid expressed in meters */
        float altitudeMeters;
        /*
         * estimated horizontal accuracy of position expressed in meters, radial,
         * 68% confidence.
         */
        double accuracyMeters;
        /*
         * Time duration before this report that this position information was
         * valid.
         */
        float ageSeconds;
    };

    /*
     * Provides the current best known UTC time estimate.
     */
    struct TimeDebug {
        /*
         * Validity of the data in the struct.
         * False if current time is unknown.
         */
        bool valid;
        /*
         * UTC time estimate.
         */
        GnssUtcTime timeEstimate;
        /* 68% error estimate in time. */
        float timeUncertaintyNs;
    };

    /*
     * Provides a single satellite info that has decoded navigation data.
     */
    struct SatelliteData {
        /* Satellite vehicle ID number */
        int16_t svid;
        /* Defines the constellation type of the given SV. */
        GnssConstellationType constellation;
        /* Defines the ephemeris type of the satellite. */
        SatelliteEphemerisType ephemerisType;
        /*
         * Time duration before this report, that the ephemeris source was last
         * updated, e.g. latest demodulation, or latest server download.
         * Set to 0 when ephemerisType is UNKNOWN.
         */
        float ephemerisAgeSeconds;
    };

    /*
     * Provides a set of debug information that is filled by the GNSS chipset
     * when the method getDebugData() is invoked.
     */
    struct DebugData {
        /* Current best known position. */
        PositionDebug position;
        /* Current best know time estimate */
        TimeDebug time;
        /*
         * Provides a list of the decoded satellite ephemeris.
         * Should provide a complete list for all constellations device can track,
         * including GnssConstellationType UNKNOWN.
         */
        vec<SatelliteData> satelliteDataArray;

    };

    /*
     * This methods requests position, time and satellite ephemeris debug information
     * from the HAL.
     *
     * @return ret debugData information from GNSS Hal that contains the current best
     * known position, best known time estimate and a complete list of
     * constellations that the device can track.
     */
    getDebugData() generates (DebugData debugData);
};