diff options
Diffstat (limited to 'src/modules/multirotor_att_control/multirotor_rate_control.c')
-rw-r--r-- | src/modules/multirotor_att_control/multirotor_rate_control.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/modules/multirotor_att_control/multirotor_rate_control.c b/src/modules/multirotor_att_control/multirotor_rate_control.c new file mode 100644 index 000000000..deba1ac03 --- /dev/null +++ b/src/modules/multirotor_att_control/multirotor_rate_control.c @@ -0,0 +1,230 @@ +/**************************************************************************** + * + * 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++; +} |