ctrl_windtunnel.c

Go to the documentation of this file.

/*
 * Copyright (C) 2020 Freek van Tienen <freek.v.tienen@gmail.com>
 *
 * 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/>.
 */
 
#include "modules/ctrl/ctrl_windtunnel.h"
#include "state.h"
#include "modules/radio_control/radio_control.h"
#include "firmwares/rotorcraft/stabilization.h"
#include "modules/energy/electrical.h"
 
#ifndef WINDTUNNEL_TO_BODY_PHI
#define WINDTUNNEL_TO_BODY_PHI 0
#endif
 
#ifndef WINDTUNNEL_TO_BODY_THETA
#define WINDTUNNEL_TO_BODY_THETA 0
#endif
 
#ifndef WINDTUNNEL_TO_BODY_PSI
#define WINDTUNNEL_TO_BODY_PSI 0
#endif
 
struct ctrl_windtunnel_struct {
  int rc_throttle;
  int rc_roll;
  int rc_pitch;
  int rc_yaw;
  struct OrientationReps rotation;
} ctrl_windtunnel;
 
float ctrl_windtunnel_steptime = CTRL_WINDTUNNEL_STEPTIME;
struct min_max_ctrl_t ctrl_windtunnel_throttle = {.min = CTRL_WINDTUNNEL_THR_MIN, .max = CTRL_WINDTUNNEL_THR_MAX, .step = CTRL_WINDTUNNEL_THR_STEP};
struct min_max_ctrl_t ctrl_windtunnel_flaps = {.min = CTRL_WINDTUNNEL_FLAP_MIN, .max = CTRL_WINDTUNNEL_FLAP_MAX, .step = CTRL_WINDTUNNEL_FLAP_STEP};
static float last_time = 0;
 
 
#if PERIODIC_TELEMETRY
#include "modules/datalink/telemetry.h"
static void send_windtunnel_meas(struct transport_tx *trans, struct link_device *dev)
{
  struct FloatQuat windtunnel_to_body;
  struct FloatEulers windtunnel_to_body_e;
  struct FloatQuat *rotation = orientationGetQuat_f(&ctrl_windtunnel.rotation);
  struct FloatQuat *ned_to_body = stateGetNedToBodyQuat_f();
  float_quat_comp_inv(&windtunnel_to_body, ned_to_body, rotation);
  float_eulers_of_quat(&windtunnel_to_body_e, &windtunnel_to_body);
 
  float aoa = DegOfRad(windtunnel_to_body_e.theta);
  float power = electrical.vsupply * electrical.current;
  pprz_msg_send_WINDTUNNEL_MEAS(trans, dev, AC_ID, &aoa, &air_data.airspeed, &electrical.vsupply, &electrical.current,
                                &power, COMMANDS_NB, stabilization.cmd);
}
#endif
 
void ctrl_windtunnel_init(void)
{
  ctrl_windtunnel.rc_throttle = 0;
  ctrl_windtunnel.rc_roll = 0;
  ctrl_windtunnel.rc_pitch = 0;
  ctrl_windtunnel.rc_yaw = 0;
 
  // Create a rotation to the windtunnel from the body
  struct FloatEulers windtunnel_to_body_eulers =
  {WINDTUNNEL_TO_BODY_PHI, WINDTUNNEL_TO_BODY_THETA, WINDTUNNEL_TO_BODY_PSI};
  orientationSetEulers_f(&ctrl_windtunnel.rotation, &windtunnel_to_body_eulers);
 
#if PERIODIC_TELEMETRY
  register_periodic_telemetry(DefaultPeriodic, PPRZ_MSG_ID_WINDTUNNEL_MEAS, send_windtunnel_meas);
#endif
}
 
static void ctrl_module_run(bool in_flight __attribute__((unused)))
{
  bool done = false;
  // Increase step in steptime
  if (ctrl_windtunnel.rc_throttle > (MAX_PPRZ / 2) && (get_sys_time_float() - last_time) > ctrl_windtunnel_steptime) {
    // Increase throttle step if flaps at the end
    if ((ctrl_windtunnel_flaps.current + ctrl_windtunnel_flaps.step) > ctrl_windtunnel_flaps.max) {
      // Only increase step if throttle is not at the end
      if ((ctrl_windtunnel_throttle.current + ctrl_windtunnel_throttle.step) <= ctrl_windtunnel_throttle.max) {
        ctrl_windtunnel_throttle.current += ctrl_windtunnel_throttle.step;
        ctrl_windtunnel_flaps.current = ctrl_windtunnel_flaps.min;
        last_time = get_sys_time_float();
      } else {
        // Finished
        done = true;
      }
    } else {
      // By default increase flaps
      ctrl_windtunnel_flaps.current += ctrl_windtunnel_flaps.step;
 
      // Double the amount of steptime during double transition
      if ((ctrl_windtunnel_flaps.current == ctrl_windtunnel_flaps.min)) {
        last_time = get_sys_time_float() + ctrl_windtunnel_steptime;
      } else {
        last_time = get_sys_time_float();
      }
    }
  } else if (ctrl_windtunnel.rc_throttle < (MAX_PPRZ / 2)) {
    // RESET
    ctrl_windtunnel_throttle.current = ctrl_windtunnel_throttle.min;
    ctrl_windtunnel_flaps.current = ctrl_windtunnel_flaps.min;
    last_time = get_sys_time_float();
  }
 
  stabilization.cmd[COMMAND_ROLL] = 0;
  stabilization.cmd[COMMAND_PITCH] = 0;
  stabilization.cmd[COMMAND_YAW] = 0;
  stabilization.cmd[COMMAND_THRUST] = (done) ? 0 : ctrl_windtunnel_throttle.current;
  stabilization.cmd[COMMAND_FLAPS] = (done) ? 0 : ctrl_windtunnel_flaps.current;
}
 
 
// Call our controller
// Implement own loops
void guidance_module_enter(void)
{
  ctrl_windtunnel.rc_throttle = 0;
  ctrl_windtunnel.rc_roll = 0;
  ctrl_windtunnel.rc_pitch = 0;
  ctrl_windtunnel.rc_yaw = 0;
}
 
void guidance_module_run(bool in_flight)
{
  // -MAX_PPRZ to MAX_PPRZ
  ctrl_windtunnel.rc_throttle = radio_control.values[RADIO_THROTTLE];
  ctrl_windtunnel.rc_roll = radio_control.values[RADIO_ROLL];
  ctrl_windtunnel.rc_pitch = radio_control.values[RADIO_PITCH];
  ctrl_windtunnel.rc_yaw = radio_control.values[RADIO_YAW];
  // Call full inner-/outerloop / horizontal-/vertical controller:
  ctrl_module_run(in_flight);
}