Android 源码分析 - 传感器 - HAL层

typedef struct {

    union {

        float v[3];

        struct {

            float x;

            float y;

            float z;

        };

        struct {

            float azimuth;

            float pitch;

            float roll;

        };

    };

    int8_t status;

    uint8_t reserved[3];

} sensors_vec_t;

typedef struct sensors_event_t {

    int32_t version;

    int32_t sensor;

    int32_t type;

    int32_t reserved0;

    int64_t timestamp;

    union {

        union {

            float           data[16];

            sensors_vec_t   acceleration;

            sensors_vec_t   magnetic;

            sensors_vec_t   orientation;

            sensors_vec_t   gyro;

            float           temperature;

            float           distance;

            float           light;

            float           pressure;

            float           relative_humidity;

            uncalibrated_event_t uncalibrated_gyro;

            uncalibrated_event_t uncalibrated_magnetic;

            meta_data_event_t meta_data;

        };

        union {

            uint64_t        data[8];

            uint64_t        step_counter;

        } u64;

    };

    uint32_t reserved1[4];

} sensors_event_t;

struct sensor_t {

    const char*     name;

    const char*     vendor;

    int             version;

    int             handle;

    int             type;

    float           maxRange;

    float           resolution;

    float           power;

    int32_t         minDelay;

    uint32_t        fifoReservedEventCount;

    uint32_t        fifoMaxEventCount;

    void*           reserved[6];

};

struct sensors_module_t {

    struct hw_module_t common;

    int (*get_sensors_list)(struct sensors_module_t* module,

            struct sensor_t const** list);

};