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/****************************************************************************
*
* Copyright (C) 2012 PX4 Development Team. All rights reserved.
* Author: Tobias Naegeli <naegelit@student.ethz.ch>
* Lorenz Meier <lm@inf.ethz.ch>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name PX4 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 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/**
* @file multirotor_rate_control.c
*
* Implementation of rate controller
*
* @author Tobias Naegeli <naegelit@student.ethz.ch>
* @author Lorenz Meier <lm@inf.ethz.ch>
*/
#include "multirotor_rate_control.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <float.h>
#include <math.h>
#include <systemlib/pid/pid.h>
#include <systemlib/param/param.h>
#include <systemlib/err.h>
#include <drivers/drv_hrt.h>
PARAM_DEFINE_FLOAT(MC_YAWRATE_P, 0.0f); /* same on Flamewheel */
PARAM_DEFINE_FLOAT(MC_YAWRATE_D, 0.0f);
PARAM_DEFINE_FLOAT(MC_YAWRATE_I, 0.0f);
//PARAM_DEFINE_FLOAT(MC_YAWRATE_AWU, 0.0f);
//PARAM_DEFINE_FLOAT(MC_YAWRATE_LIM, 1.0f);
PARAM_DEFINE_FLOAT(MC_ATTRATE_P, 0.0f); /* 0.15 F405 Flamewheel */
PARAM_DEFINE_FLOAT(MC_ATTRATE_D, 0.0f);
PARAM_DEFINE_FLOAT(MC_ATTRATE_I, 0.0f);
//PARAM_DEFINE_FLOAT(MC_ATTRATE_AWU, 0.05f);
//PARAM_DEFINE_FLOAT(MC_ATTRATE_LIM, 1.0f); /**< roughly < 500 deg/s limit */
struct mc_rate_control_params {
float yawrate_p;
float yawrate_d;
float yawrate_i;
//float yawrate_awu;
//float yawrate_lim;
float attrate_p;
float attrate_d;
float attrate_i;
//float attrate_awu;
//float attrate_lim;
float rate_lim;
};
struct mc_rate_control_param_handles {
param_t yawrate_p;
param_t yawrate_i;
param_t yawrate_d;
//param_t yawrate_awu;
//param_t yawrate_lim;
param_t attrate_p;
param_t attrate_i;
param_t attrate_d;
//param_t attrate_awu;
//param_t attrate_lim;
};
/**
* Initialize all parameter handles and values
*
*/
static int parameters_init(struct mc_rate_control_param_handles *h);
/**
* Update all parameters
*
*/
static int parameters_update(const struct mc_rate_control_param_handles *h, struct mc_rate_control_params *p);
static int parameters_init(struct mc_rate_control_param_handles *h)
{
/* PID parameters */
h->yawrate_p = param_find("MC_YAWRATE_P");
h->yawrate_i = param_find("MC_YAWRATE_I");
h->yawrate_d = param_find("MC_YAWRATE_D");
//h->yawrate_awu = param_find("MC_YAWRATE_AWU");
//h->yawrate_lim = param_find("MC_YAWRATE_LIM");
h->attrate_p = param_find("MC_ATTRATE_P");
h->attrate_i = param_find("MC_ATTRATE_I");
h->attrate_d = param_find("MC_ATTRATE_D");
//h->attrate_awu = param_find("MC_ATTRATE_AWU");
//h->attrate_lim = param_find("MC_ATTRATE_LIM");
return OK;
}
static int parameters_update(const struct mc_rate_control_param_handles *h, struct mc_rate_control_params *p)
{
param_get(h->yawrate_p, &(p->yawrate_p));
param_get(h->yawrate_i, &(p->yawrate_i));
param_get(h->yawrate_d, &(p->yawrate_d));
//param_get(h->yawrate_awu, &(p->yawrate_awu));
//param_get(h->yawrate_lim, &(p->yawrate_lim));
param_get(h->attrate_p, &(p->attrate_p));
param_get(h->attrate_i, &(p->attrate_i));
param_get(h->attrate_d, &(p->attrate_d));
//param_get(h->attrate_awu, &(p->attrate_awu));
//param_get(h->attrate_lim, &(p->attrate_lim));
return OK;
}
void multirotor_control_rates(const struct vehicle_rates_setpoint_s *rate_sp,
const float rates[], struct actuator_controls_s *actuators)
{
static float roll_control_last = 0;
static float pitch_control_last = 0;
static uint64_t last_run = 0;
const float deltaT = (hrt_absolute_time() - last_run) / 1000000.0f;
static uint64_t last_input = 0;
float dT_input = (hrt_absolute_time() - last_input) / 1000000.0f;
if (last_input != rate_sp->timestamp) {
last_input = rate_sp->timestamp;
}
last_run = hrt_absolute_time();
static int motor_skip_counter = 0;
static struct mc_rate_control_params p;
static struct mc_rate_control_param_handles h;
static bool initialized = false;
/* initialize the pid controllers when the function is called for the first time */
if (initialized == false) {
parameters_init(&h);
parameters_update(&h, &p);
initialized = true;
}
/* load new parameters with lower rate */
if (motor_skip_counter % 2500 == 0) {
/* update parameters from storage */
parameters_update(&h, &p);
// warnx("rate ctrl: p.yawrate_p: %8.4f, loop: %d Hz, input: %d Hz",
// (double)p.yawrate_p, (int)(1.0f/deltaT), (int)(1.0f/dT_input));
}
/* calculate current control outputs */
/* control pitch (forward) output */
float pitch_control = p.attrate_p * (rate_sp->pitch - rates[1]) - (p.attrate_d * pitch_control_last);
/* increase resilience to faulty control inputs */
if (isfinite(pitch_control)) {
pitch_control_last = pitch_control;
} else {
pitch_control = 0.0f;
warnx("rej. NaN ctrl pitch");
}
/* control roll (left/right) output */
float roll_control = p.attrate_p * (rate_sp->roll - rates[0]) - (p.attrate_d * roll_control_last);
/* increase resilience to faulty control inputs */
if (isfinite(roll_control)) {
roll_control_last = roll_control;
} else {
roll_control = 0.0f;
warnx("rej. NaN ctrl roll");
}
/* control yaw rate */
float yaw_rate_control = p.yawrate_p * (rate_sp->yaw - rates[2]);
/* increase resilience to faulty control inputs */
if (!isfinite(yaw_rate_control)) {
yaw_rate_control = 0.0f;
warnx("rej. NaN ctrl yaw");
}
actuators->control[0] = roll_control;
actuators->control[1] = pitch_control;
actuators->control[2] = yaw_rate_control;
actuators->control[3] = rate_sp->thrust;
motor_skip_counter++;
}
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