command_manager.h

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/*
 * Copyright (c) 2017, James Jackson and Daniel Koch, BYU MAGICC Lab
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef ROSFLIGHT_FIRMWARE_COMMAND_MANAGER_H
#define ROSFLIGHT_FIRMWARE_COMMAND_MANAGER_H

#include <stdbool.h>
#include <stdint.h>

#include "rc.h"

namespace rosflight_firmware
{

class ROSflight;

typedef enum
{
  RATE,         // Channel is is in rate mode (mrad/s)
  ANGLE,        // Channel command is in angle mode (mrad)
  THROTTLE,     // Channel is direcly controlling throttle max/1000
  PASSTHROUGH,  // Channel directly passes PWM input to the mixer
} control_type_t;

typedef struct
{
  bool active;          // Whether or not the channel is active
  control_type_t type;  // What type the channel is
  float value;          // The value of the channel
} control_channel_t;

typedef struct
{
  uint32_t stamp_ms;
  control_channel_t x;
  control_channel_t y;
  control_channel_t z;
  control_channel_t F;
} control_t;

class CommandManager
{

private:

  typedef struct
  {
    control_channel_t *rc;
    control_channel_t *onboard;
    control_channel_t *combined;
  } mux_t;

  mux_t muxes[4] =
  {
    {&rc_command_.x, &offboard_command_.x, &combined_command_.x},
    {&rc_command_.y, &offboard_command_.y, &combined_command_.y},
    {&rc_command_.z, &offboard_command_.z, &combined_command_.z},
    {&rc_command_.F, &offboard_command_.F, &combined_command_.F}
  };

  control_t rc_command_ =
  {
    0,
    {false, ANGLE, 0.0},
    {false, ANGLE, 0.0},
    {false, RATE, 0.0},
    {false, THROTTLE, 0.0}
  };
  control_t offboard_command_ =
  {
    0,
    {false, ANGLE, 0.0},
    {false, ANGLE, 0.0},
    {false, RATE, 0.0},
    {false, THROTTLE, 0.0}
  };
  control_t combined_command_ =
  {
    0,
    {false, ANGLE, 0.0},
    {false, ANGLE, 0.0},
    {false, RATE, 0.0},
    {false, THROTTLE, 0.0}
  };

  control_t multirotor_failsafe_command_ =
  {
    0,
    {true, ANGLE, 0.0},
    {true, ANGLE, 0.0},
    {true, RATE, 0.0},
    {true, THROTTLE, 0.0}
  };
  control_t fixedwing_failsafe_command_ =
  {
    0,
    {true, PASSTHROUGH, 0.0},
    {true, PASSTHROUGH, 0.0},
    {true, PASSTHROUGH, 0.0},
    {true, THROTTLE, 0.0}
  };

  typedef enum
  {
    ATT_MODE_RATE,
    ATT_MODE_ANGLE
  } att_mode_t;

  enum MuxChannel
  {
    MUX_X,
    MUX_Y,
    MUX_Z,
    MUX_F,
  };

  typedef struct
  {
    RC::Stick rc_channel;
    uint32_t last_override_time;
  } rc_stick_override_t;

  rc_stick_override_t rc_stick_override_[3] =
  {
    { RC::STICK_X, 0 },
    { RC::STICK_Y, 0 },
    { RC::STICK_Z, 0 }
  };

  ROSflight &RF_;

  bool new_command_;
  bool rc_override_;

  control_t &failsafe_command_;

  void param_change_callback(uint16_t param_id);
  void init_failsafe();

  bool do_roll_pitch_yaw_muxing(MuxChannel channel);
  bool do_throttle_muxing(void);
  void do_min_throttle_muxing();

  void interpret_rc(void);
  bool stick_deviated(MuxChannel channel);

public:

  CommandManager(ROSflight &_rf);
  void init();
  bool run();
  bool rc_override_active();
  bool offboard_control_active();
  void set_new_offboard_command(control_t new_offboard_command);
  void set_new_rc_command(control_t new_rc_command);
  void override_combined_command_with_rc();
  inline const control_t &combined_control() const
  {
    return combined_command_;
  }
  inline const control_t &rc_control() const
  {
    return rc_command_;
  }
};

} // namespace rosflight_firmware

#endif // ROSFLIGHT_FIRMWARE_COMMAND_MANAGER_H