mirror of https://github.com/ArduPilot/ardupilot
101 lines
3.7 KiB
C++
101 lines
3.7 KiB
C++
/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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/*
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* OpticalFlow.h - OpticalFlow Base Class for Ardupilot
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* Code by Randy Mackay. DIYDrones.com
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*/
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#include <AP_HAL/AP_HAL.h>
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#include <AP_Math/AP_Math.h>
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class OpticalFlow_backend;
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class AP_AHRS_NavEKF;
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class OpticalFlow
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{
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friend class OpticalFlow_backend;
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public:
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// constructor
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OpticalFlow(AP_AHRS_NavEKF& ahrs);
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// init - initialise sensor
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void init(void);
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// enabled - returns true if optical flow is enabled
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bool enabled() const { return _enabled; }
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// healthy - return true if the sensor is healthy
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bool healthy() const { return backend != nullptr && _flags.healthy; }
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// read latest values from sensor and fill in x,y and totals.
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void update(void);
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// quality - returns the surface quality as a measure from 0 ~ 255
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uint8_t quality() const { return _state.surface_quality; }
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// raw - returns the raw movement from the sensor
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const Vector2f& flowRate() const { return _state.flowRate; }
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// velocity - returns the velocity in m/s
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const Vector2f& bodyRate() const { return _state.bodyRate; }
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// device_id - returns device id
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uint8_t device_id() const { return _state.device_id; }
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// last_update() - returns system time of last sensor update
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uint32_t last_update() const { return _last_update_ms; }
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struct OpticalFlow_state {
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uint8_t device_id; // device id
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uint8_t surface_quality; // image quality (below TBD you can't trust the dx,dy values returned)
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Vector2f flowRate; // optical flow angular rate in rad/sec measured about the X and Y body axis. A RH rotation about a sensor axis produces a positive rate.
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Vector2f bodyRate; // body inertial angular rate in rad/sec measured about the X and Y body axis. A RH rotation about a sensor axis produces a positive rate.
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};
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// return a 3D vector defining the position offset of the sensors focal point in metres relative to the body frame origin
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const Vector3f &get_pos_offset(void) const {
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return _pos_offset;
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}
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// parameter var info table
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static const struct AP_Param::GroupInfo var_info[];
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private:
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AP_AHRS_NavEKF &_ahrs;
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OpticalFlow_backend *backend;
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struct AP_OpticalFlow_Flags {
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uint8_t healthy : 1; // true if sensor is healthy
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} _flags;
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// parameters
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AP_Int8 _enabled; // enabled/disabled flag
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AP_Int16 _flowScalerX; // X axis flow scale factor correction - parts per thousand
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AP_Int16 _flowScalerY; // Y axis flow scale factor correction - parts per thousand
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AP_Int16 _yawAngle_cd; // yaw angle of sensor X axis with respect to vehicle X axis - centi degrees
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AP_Vector3f _pos_offset; // position offset of the flow sensor in the body frame
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AP_Int8 _address; // address on the bus (allows selecting between 8 possible I2C addresses for px4flow)
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// state filled in by backend
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struct OpticalFlow_state _state;
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uint32_t _last_update_ms; // millis() time of last update
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};
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#include "OpticalFlow_backend.h"
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