optical_flow_functions.h

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/*
 * Copyright (C) 2018
 *
 * This file is part of paparazzi.
 *
 * paparazzi 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 2, or (at your option)
 * any later version.
 *
 * paparazzi 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 paparazzi; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.
 */
 
#ifndef OPTICAL_FLOW_FUNCTIONS_H_
#define OPTICAL_FLOW_FUNCTIONS_H_
 
#include "std.h"
#include "math/pprz_algebra_float.h"
 
struct GainsPID {
  float P;             
  float I;             
  float D;             
  float err;                     
  float previous_err;            
  float sum_err;                 
  float d_err;                   
};
 
struct OFhistory {
  float input[COV_WINDOW_SIZE];
  float OF[COV_WINDOW_SIZE];
  float past_OF[COV_WINDOW_SIZE];
};
 
struct OpticalFlowHoverControl {
  struct GainsPID PID;       
 
  float nominal_value;       
 
  float ramp;                
 
  float reduction_factor;    
 
  float setpoint;            
  float cov_setpoint;        
};
 
struct OpticalFlowHover {
  float divergence;        
  float flowX;             
  float flowY;             
};
 
struct DesiredInputs {
  float phi;
  float theta;
  int32_t thrust;
};
 
extern uint32_t ind_histXY;
extern uint8_t cov_array_filledXY;
extern uint32_t ind_histZ;
extern uint8_t cov_array_filledZ;
 
struct OpticalFlowHover of_hover;
 
extern float set_cov_div(bool cov_method, struct OFhistory *history, struct DesiredInputs *inputs);
extern void set_cov_flow(bool cov_method, struct OFhistory *historyX, struct OFhistory *historyY,
                         struct DesiredInputs *inputs, struct FloatVect3 *covs);
extern float PID_flow_control(float dt, struct OpticalFlowHoverControl *of_hover_ctrl);
extern int32_t PID_divergence_control(float dt, struct OpticalFlowHoverControl *of_hover_ctrl);
#endif /* OPTICAL_FLOW_FUNCTIONS_H_ */