ardupilot/libraries/AP_IRLock/IRLock.h

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/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* IRLock.h - IRLock Base Class for Ardupilot
*
* Created on: Nov 10, 2014
* Author: MLandes
*/
#pragma once
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#include <AP_AHRS/AP_AHRS.h>
#define IRLOCK_MAX_TARGETS 5 // max number of targets that can be detected by IR-LOCK sensor (should match PX4Firmware's irlock driver's IRLOCK_OBJECTS_MAX)
#define IRLOCK_TIMEOUT_MS 100 // target info times out after 0.1 seconds
class IRLock
{
public:
IRLock();
virtual ~IRLock();
// init - initialize sensor library
// library won't be useable unless this is first called
virtual void init() = 0;
// true if irlock sensor is online and healthy
bool healthy() const { return _flags.healthy; }
// timestamp of most recent data read from the sensor
uint32_t last_update() const { return _last_update; }
// returns the number of blocks in the current frame
size_t num_targets() const { return _num_targets; }
// retrieve latest sensor data - returns true if new data is available
virtual bool update() = 0;
// get_angle_to_target - retrieve body frame x and y angles (in radians) to target
// returns true if angles are available, false if not (i.e. no target)
bool get_angle_to_target(float &x_angle_rad, float &y_angle_rad) const;
protected:
struct AP_IRLock_Flags {
uint8_t healthy : 1; // true if sensor is healthy
} _flags;
// internals
uint32_t _last_update;
uint16_t _num_targets;
// irlock_target_info is a duplicate of the PX4Firmware irlock_s structure
typedef struct {
uint64_t timestamp; // time target was seen in microseconds since system start
uint16_t target_num; // target number prioritised by size (largest is 0)
float angle_x; // x-axis angle in radians from center of image to center of target
float angle_y; // y-axis angle in radians from center of image to center of target
float size_x; // size in radians of target along x-axis
float size_y; // size in radians of target along y-axis
} irlock_target_info;
irlock_target_info _target_info[IRLOCK_MAX_TARGETS];
};