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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.hardware.gnss@1.1;
     18 
     19 import @1.0::IGnssMeasurementCallback;
     20 
     21 /** The callback interface to report measurements from the HAL. */
     22 interface IGnssMeasurementCallback extends @1.0::IGnssMeasurementCallback {
     23     /**
     24      * Flags indicating the Accumulated Delta Range's states.
     25      */
     26     enum GnssAccumulatedDeltaRangeState
     27             : @1.0::IGnssMeasurementCallback.GnssAccumulatedDeltaRangeState {
     28         ADR_STATE_HALF_CYCLE_RESOLVED = 1 << 3, // Carrier-phase half-cycle ambiguity resolved
     29     };
     30 
     31     /**
     32      * Extends a GNSS Measurement, adding the new enum.
     33      */
     34     struct GnssMeasurement {
     35         /**
     36          * GNSS measurement information for a single satellite and frequency, as in the 1.0
     37          * version of the HAL.
     38          *
     39          * In this version of the HAL, these fields of the
     40          * @1.0::IGnssMeasurementCallback.GnssMeasurement v1_0 struct are deprecated, and
     41          * are no longer used by the framework:
     42          *   carrierCycles
     43          *   carrierPhase
     44          *   carrierPhaseUncertainty
     45          *
     46          * Similar information about carrier phase signal tracking is still reported in these
     47          * fields of @1.0::IGnssMeasurementCallback.GnssMeasurement v1_0:
     48          *   accumulatedDeltaRangeM
     49          *   accumulatedDeltaRangeUncertaintyM
     50          */
     51         @1.0::IGnssMeasurementCallback.GnssMeasurement v1_0;
     52 
     53         /**
     54          * Provides the state of Accumulated Delta Range values, including additional information
     55          * beyond version 1.0 of the HAL.  See GnssAccumulatedDeltaRangeState.
     56          *
     57          * In this (1.1) version of the HAL, this value is used by the framework, not the
     58          * value provided by v1_0.accumulatedDeltaRangeState.
     59          */
     60         bitfield<GnssAccumulatedDeltaRangeState> accumulatedDeltaRangeState;
     61     };
     62 
     63     /**
     64      * Complete set of GNSS Measurement data, same as 1.0 with additional enum in measurements.
     65      */
     66     struct GnssData {
     67         /** The full set of satellite measurement observations. */
     68         vec<GnssMeasurement> measurements;
     69 
     70         /** The GNSS clock time reading. */
     71         GnssClock clock;
     72     };
     73 
     74     /**
     75      * Callback for the hal to pass a GnssData structure back to the client.
     76      *
     77      * @param data Contains a reading of GNSS measurements.
     78      */
     79     gnssMeasurementCb(GnssData data);
     80 };
     81