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LibrePilot/flight/modules/PathFollower/vtollandcontroller.cpp

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/*
******************************************************************************
*
* @file vtollandcontroller.cpp
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2015.
* @brief Vtol landing controller loop
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* 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, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
extern "C" {
#include <openpilot.h>
#include <callbackinfo.h>
#include <math.h>
#include <pid.h>
#include <alarms.h>
#include <CoordinateConversions.h>
#include <sin_lookup.h>
#include <pathdesired.h>
#include <paths.h>
#include "plans.h"
#include <sanitycheck.h>
#include <accelstate.h>
#include <vtolpathfollowersettings.h>
#include <flightstatus.h>
#include <flightmodesettings.h>
#include <pathstatus.h>
#include <positionstate.h>
#include <velocitystate.h>
#include <velocitydesired.h>
#include <stabilizationdesired.h>
#include <attitudestate.h>
#include <takeofflocation.h>
#include <manualcontrolcommand.h>
#include <systemsettings.h>
#include <stabilizationbank.h>
#include <stabilizationdesired.h>
#include <vtolselftuningstats.h>
#include <pathsummary.h>
}
// C++ includes
#include "vtollandcontroller.h"
#include "pathfollowerfsm.h"
#include "vtollandfsm.h"
#include "pidcontroldown.h"
// Private constants
// pointer to a singleton instance
VtolLandController *VtolLandController::p_inst = 0;
VtolLandController::VtolLandController()
: fsm(NULL), vtolPathFollowerSettings(NULL), mActive(false)
{}
// Called when mode first engaged
void VtolLandController::Activate(void)
{
if (!mActive) {
mActive = true;
SettingsUpdated();
fsm->Activate();
controlDown.Activate();
controlNE.Activate();
}
}
uint8_t VtolLandController::IsActive(void)
{
return mActive;
}
uint8_t VtolLandController::Mode(void)
{
return PATHDESIRED_MODE_LAND;
}
// Objective updated in pathdesired, e.g. same flight mode but new target velocity
void VtolLandController::ObjectiveUpdated(void)
{
// Set the objective's target velocity
controlDown.UpdateVelocitySetpoint(pathDesired->ModeParameters[PATHDESIRED_MODEPARAMETER_VELOCITY_VELOCITYVECTOR_DOWN]);
controlNE.UpdateVelocitySetpoint(pathDesired->ModeParameters[PATHDESIRED_MODEPARAMETER_VELOCITY_VELOCITYVECTOR_NORTH],
pathDesired->ModeParameters[PATHDESIRED_MODEPARAMETER_VELOCITY_VELOCITYVECTOR_EAST]);
controlNE.UpdatePositionSetpoint(pathDesired->End.North, pathDesired->End.East);
}
void VtolLandController::Deactivate(void)
{
if (mActive) {
mActive = false;
fsm->Inactive();
controlDown.Deactivate();
controlNE.Deactivate();
}
}
void VtolLandController::SettingsUpdated(void)
{
const float dT = vtolPathFollowerSettings->UpdatePeriod / 1000.0f;
controlNE.UpdateParameters(vtolPathFollowerSettings->HorizontalVelPID.Kp,
vtolPathFollowerSettings->HorizontalVelPID.Ki,
vtolPathFollowerSettings->HorizontalVelPID.Kd,
vtolPathFollowerSettings->HorizontalVelPID.Beta,
dT,
vtolPathFollowerSettings->HorizontalVelMax);
controlNE.UpdatePositionalParameters(vtolPathFollowerSettings->HorizontalPosP);
controlNE.UpdateCommandParameters(-vtolPathFollowerSettings->MaxRollPitch, vtolPathFollowerSettings->MaxRollPitch, vtolPathFollowerSettings->VelocityFeedforward);
controlDown.UpdateParameters(vtolPathFollowerSettings->LandVerticalVelPID.Kp,
vtolPathFollowerSettings->LandVerticalVelPID.Ki,
vtolPathFollowerSettings->LandVerticalVelPID.Kd,
vtolPathFollowerSettings->LandVerticalVelPID.Beta,
dT,
vtolPathFollowerSettings->VerticalVelMax);
// The following is not currently used in the landing control.
controlDown.UpdatePositionalParameters(vtolPathFollowerSettings->VerticalPosP);
VtolSelfTuningStatsData vtolSelfTuningStats;
VtolSelfTuningStatsGet(&vtolSelfTuningStats);
controlDown.UpdateNeutralThrust(vtolSelfTuningStats.NeutralThrustOffset + vtolPathFollowerSettings->ThrustLimits.Neutral);
// initialise limits on thrust but note the FSM can override.
controlDown.SetThrustLimits(vtolPathFollowerSettings->ThrustLimits.Min, vtolPathFollowerSettings->ThrustLimits.Max);
fsm->SettingsUpdated();
}
/**
* Initialise the module, called on startup
* \returns 0 on success or -1 if initialisation failed
*/
int32_t VtolLandController::Initialize(VtolPathFollowerSettingsData *ptr_vtolPathFollowerSettings)
{
PIOS_Assert(ptr_vtolPathFollowerSettings);
if (fsm == 0) {
fsm = (PathFollowerFSM *)VtolLandFSM::instance();
VtolLandFSM::instance()->Initialize(ptr_vtolPathFollowerSettings, pathDesired, flightStatus);
vtolPathFollowerSettings = ptr_vtolPathFollowerSettings;
controlDown.Initialize(fsm);
}
return 0;
}
void VtolLandController::UpdateVelocityDesired()
{
VelocityStateData velocityState;
VelocityStateGet(&velocityState);
VelocityDesiredData velocityDesired;
controlDown.UpdateVelocityState(velocityState.Down);
controlNE.UpdateVelocityState(velocityState.North, velocityState.East);
// Implement optional horizontal position hold.
if ((((uint8_t)pathDesired->ModeParameters[PATHDESIRED_MODEPARAMETER_LAND_OPTIONS]) == PATHDESIRED_MODEPARAMETER_LAND_OPTION_HORIZONTAL_PH) ||
(flightStatus->ControlChain.PathPlanner == FLIGHTSTATUS_CONTROLCHAIN_TRUE)) {
// landing flight mode has stored original horizontal position in pathdesired
PositionStateData positionState;
PositionStateGet(&positionState);
controlNE.UpdatePositionState(positionState.North, positionState.East);
controlNE.ControlPosition();
}
velocityDesired.Down = controlDown.GetVelocityDesired();
float north, east;
controlNE.GetVelocityDesired(&north, &east);
velocityDesired.North = north;
velocityDesired.East = east;
// update pathstatus
pathStatus->error = 0.0f;
pathStatus->fractional_progress = 0.0f;
if (fsm->GetCurrentState() == PFFSM_STATE_DISARMED) {
pathStatus->fractional_progress = 1.0f;
}
pathStatus->path_direction_north = velocityDesired.North;
pathStatus->path_direction_east = velocityDesired.East;
pathStatus->path_direction_down = velocityDesired.Down;
pathStatus->correction_direction_north = velocityDesired.North - velocityState.North;
pathStatus->correction_direction_east = velocityDesired.East - velocityState.East;
pathStatus->correction_direction_down = velocityDesired.Down - velocityState.Down;
VelocityDesiredSet(&velocityDesired);
}
int8_t VtolLandController::UpdateStabilizationDesired(bool yaw_attitude, float yaw_direction)
{
uint8_t result = 1;
StabilizationDesiredData stabDesired;
AttitudeStateData attitudeState;
StabilizationBankData stabSettings;
float northCommand;
float eastCommand;
StabilizationDesiredGet(&stabDesired);
AttitudeStateGet(&attitudeState);
StabilizationBankGet(&stabSettings);
controlNE.GetNECommand(&northCommand, &eastCommand);
stabDesired.Thrust = controlDown.GetDownCommand();
float angle_radians = DEG2RAD(attitudeState.Yaw);
float cos_angle = cosf(angle_radians);
float sine_angle = sinf(angle_radians);
float maxPitch = vtolPathFollowerSettings->MaxRollPitch;
stabDesired.StabilizationMode.Pitch = STABILIZATIONDESIRED_STABILIZATIONMODE_ATTITUDE;
stabDesired.Pitch = boundf(-northCommand * cos_angle - eastCommand * sine_angle, -maxPitch, maxPitch);
stabDesired.StabilizationMode.Roll = STABILIZATIONDESIRED_STABILIZATIONMODE_ATTITUDE;
stabDesired.Roll = boundf(-northCommand * sine_angle + eastCommand * cos_angle, -maxPitch, maxPitch);
ManualControlCommandData manualControl;
ManualControlCommandGet(&manualControl);
if (yaw_attitude) {
stabDesired.StabilizationMode.Yaw = STABILIZATIONDESIRED_STABILIZATIONMODE_ATTITUDE;
stabDesired.Yaw = yaw_direction;
} else {
stabDesired.StabilizationMode.Yaw = STABILIZATIONDESIRED_STABILIZATIONMODE_AXISLOCK;
stabDesired.Yaw = stabSettings.MaximumRate.Yaw * manualControl.Yaw;
}
// default thrust mode to cruise control
stabDesired.StabilizationMode.Thrust = STABILIZATIONDESIRED_STABILIZATIONMODE_CRUISECONTROL;
fsm->ConstrainStabiDesired(&stabDesired); // excludes thrust
StabilizationDesiredSet(&stabDesired);
return result;
}
void VtolLandController::UpdateAutoPilot()
{
fsm->Update();
UpdateVelocityDesired();
// yaw behaviour is configurable in vtolpathfollower, select yaw control algorithm
bool yaw_attitude = false;
float yaw = 0.0f;
fsm->GetYaw(yaw_attitude, yaw);
int8_t result = UpdateStabilizationDesired(yaw_attitude, yaw);
if (result) {
AlarmsSet(SYSTEMALARMS_ALARM_GUIDANCE, SYSTEMALARMS_ALARM_OK);
} else {
pathStatus->Status = PATHSTATUS_STATUS_CRITICAL;
AlarmsSet(SYSTEMALARMS_ALARM_GUIDANCE, SYSTEMALARMS_ALARM_WARNING);
}
PathStatusSet(pathStatus);
}