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Diffstat (limited to 'src/modules/mc_att_control/mc_att_control_main.cpp')
| -rw-r--r-- | src/modules/mc_att_control/mc_att_control_main.cpp | 869 |
1 files changed, 869 insertions, 0 deletions
diff --git a/src/modules/mc_att_control/mc_att_control_main.cpp b/src/modules/mc_att_control/mc_att_control_main.cpp new file mode 100644 index 000000000..db5e2e9bb --- /dev/null +++ b/src/modules/mc_att_control/mc_att_control_main.cpp @@ -0,0 +1,869 @@ +/**************************************************************************** + * + * Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved. + * Author: @author Tobias Naegeli <naegelit@student.ethz.ch> + * @author Lorenz Meier <lm@inf.ethz.ch> + * @author Anton Babushkin <anton.babushkin@me.com> + * + * 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 mc_att_control_main.c + * Multicopter attitude controller. + * + * The controller has two loops: P loop for angular error and PD loop for angular rate error. + * Desired rotation calculated keeping in mind that yaw response is normally slower than roll/pitch. + * For small deviations controller rotates copter to have shortest path of thrust vector and independently rotates around yaw, + * so actual rotation axis is not constant. For large deviations controller rotates copter around fixed axis. + * These two approaches fused seamlessly with weight depending on angular error. + * When thrust vector directed near-horizontally (e.g. roll ~= PI/2) yaw setpoint ignored because of singularity. + * Controller doesn't use Euler angles for work, they generated only for more human-friendly control and logging. + * If rotation matrix setpoint is invalid it will be generated from Euler angles for compatibility with old position controllers. + */ + +#include <nuttx/config.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include <math.h> +#include <poll.h> +#include <time.h> +#include <drivers/drv_hrt.h> +#include <arch/board/board.h> +#include <uORB/uORB.h> +#include <uORB/topics/vehicle_attitude_setpoint.h> +#include <uORB/topics/manual_control_setpoint.h> +#include <uORB/topics/actuator_controls.h> +#include <uORB/topics/vehicle_rates_setpoint.h> +#include <uORB/topics/vehicle_attitude.h> +#include <uORB/topics/vehicle_control_mode.h> +#include <uORB/topics/actuator_armed.h> +#include <uORB/topics/parameter_update.h> +#include <systemlib/param/param.h> +#include <systemlib/err.h> +#include <systemlib/pid/pid.h> +#include <systemlib/perf_counter.h> +#include <systemlib/systemlib.h> +#include <mathlib/mathlib.h> +#include <lib/geo/geo.h> + +/** + * Multicopter attitude control app start / stop handling function + * + * @ingroup apps + */ +extern "C" __EXPORT int mc_att_control_main(int argc, char *argv[]); + +#define MIN_TAKEOFF_THROTTLE 0.3f +#define YAW_DEADZONE 0.05f +#define RATES_I_LIMIT 0.5f + +class MulticopterAttitudeControl +{ +public: + /** + * Constructor + */ + MulticopterAttitudeControl(); + + /** + * Destructor, also kills the sensors task. + */ + ~MulticopterAttitudeControl(); + + /** + * Start the sensors task. + * + * @return OK on success. + */ + int start(); + +private: + + bool _task_should_exit; /**< if true, sensor task should exit */ + int _control_task; /**< task handle for sensor task */ + + int _v_att_sub; /**< vehicle attitude subscription */ + int _v_att_sp_sub; /**< vehicle attitude setpoint subscription */ + int _v_rates_sp_sub; /**< vehicle rates setpoint subscription */ + int _v_control_mode_sub; /**< vehicle control mode subscription */ + int _params_sub; /**< parameter updates subscription */ + int _manual_control_sp_sub; /**< manual control setpoint subscription */ + int _armed_sub; /**< arming status subscription */ + + orb_advert_t _att_sp_pub; /**< attitude setpoint publication */ + orb_advert_t _v_rates_sp_pub; /**< rate setpoint publication */ + orb_advert_t _actuators_0_pub; /**< attitude actuator controls publication */ + + struct vehicle_attitude_s _v_att; /**< vehicle attitude */ + struct vehicle_attitude_setpoint_s _v_att_sp; /**< vehicle attitude setpoint */ + struct vehicle_rates_setpoint_s _v_rates_sp; /**< vehicle rates setpoint */ + struct manual_control_setpoint_s _manual_control_sp; /**< manual control setpoint */ + struct vehicle_control_mode_s _v_control_mode; /**< vehicle control mode */ + struct actuator_controls_s _actuators; /**< actuator controls */ + struct actuator_armed_s _armed; /**< actuator arming status */ + + perf_counter_t _loop_perf; /**< loop performance counter */ + + math::Matrix<3, 3> _R_sp; /**< attitude setpoint rotation matrix */ + math::Matrix<3, 3> _R; /**< rotation matrix for current state */ + math::Vector<3> _rates_prev; /**< angular rates on previous step */ + math::Vector<3> _rates_sp; /**< angular rates setpoint */ + math::Vector<3> _rates_int; /**< angular rates integral error */ + float _thrust_sp; /**< thrust setpoint */ + math::Vector<3> _att_control; /**< attitude control vector */ + + math::Matrix<3, 3> I; /**< identity matrix */ + + bool _reset_yaw_sp; /**< reset yaw setpoint flag */ + + struct { + param_t roll_p; + param_t roll_rate_p; + param_t roll_rate_i; + param_t roll_rate_d; + param_t pitch_p; + param_t pitch_rate_p; + param_t pitch_rate_i; + param_t pitch_rate_d; + param_t yaw_p; + param_t yaw_rate_p; + param_t yaw_rate_i; + param_t yaw_rate_d; + param_t yaw_ff; + + param_t rc_scale_yaw; + } _params_handles; /**< handles for interesting parameters */ + + struct { + math::Vector<3> att_p; /**< P gain for angular error */ + math::Vector<3> rate_p; /**< P gain for angular rate error */ + math::Vector<3> rate_i; /**< I gain for angular rate error */ + math::Vector<3> rate_d; /**< D gain for angular rate error */ + float yaw_ff; /**< yaw control feed-forward */ + + float rc_scale_yaw; + } _params; + + /** + * Update our local parameter cache. + */ + int parameters_update(); + + /** + * Check for parameter update and handle it. + */ + void parameter_update_poll(); + + /** + * Check for changes in vehicle control mode. + */ + void vehicle_control_mode_poll(); + + /** + * Check for changes in manual inputs. + */ + void vehicle_manual_poll(); + + /** + * Check for attitude setpoint updates. + */ + void vehicle_attitude_setpoint_poll(); + + /** + * Check for rates setpoint updates. + */ + void vehicle_rates_setpoint_poll(); + + /** + * Check for arming status updates. + */ + void arming_status_poll(); + + /** + * Attitude controller. + */ + void control_attitude(float dt); + + /** + * Attitude rates controller. + */ + void control_attitude_rates(float dt); + + /** + * Shim for calling task_main from task_create. + */ + static void task_main_trampoline(int argc, char *argv[]); + + /** + * Main sensor collection task. + */ + void task_main() __attribute__((noreturn)); +}; + +namespace mc_att_control +{ + +/* oddly, ERROR is not defined for c++ */ +#ifdef ERROR +# undef ERROR +#endif +static const int ERROR = -1; + +MulticopterAttitudeControl *g_control; +} + +MulticopterAttitudeControl::MulticopterAttitudeControl() : + + _task_should_exit(false), + _control_task(-1), + +/* subscriptions */ + _v_att_sub(-1), + _v_att_sp_sub(-1), + _v_control_mode_sub(-1), + _params_sub(-1), + _manual_control_sp_sub(-1), + _armed_sub(-1), + +/* publications */ + _att_sp_pub(-1), + _v_rates_sp_pub(-1), + _actuators_0_pub(-1), + +/* performance counters */ + _loop_perf(perf_alloc(PC_ELAPSED, "fw att control")) + +{ + memset(&_v_att, 0, sizeof(_v_att)); + memset(&_v_att_sp, 0, sizeof(_v_att_sp)); + memset(&_manual_control_sp, 0, sizeof(_manual_control_sp)); + memset(&_v_control_mode, 0, sizeof(_v_control_mode)); + memset(&_armed, 0, sizeof(_armed)); + + _params.att_p.zero(); + _params.rate_p.zero(); + _params.rate_i.zero(); + _params.rate_d.zero(); + + _R_sp.identity(); + _R.identity(); + _rates_prev.zero(); + _rates_sp.zero(); + _rates_int.zero(); + _thrust_sp = 0.0f; + _att_control.zero(); + + I.identity(); + + _params_handles.roll_p = param_find("MC_ROLL_P"); + _params_handles.roll_rate_p = param_find("MC_ROLLRATE_P"); + _params_handles.roll_rate_i = param_find("MC_ROLLRATE_I"); + _params_handles.roll_rate_d = param_find("MC_ROLLRATE_D"); + _params_handles.pitch_p = param_find("MC_PITCH_P"); + _params_handles.pitch_rate_p = param_find("MC_PITCHRATE_P"); + _params_handles.pitch_rate_i = param_find("MC_PITCHRATE_I"); + _params_handles.pitch_rate_d = param_find("MC_PITCHRATE_D"); + _params_handles.yaw_p = param_find("MC_YAW_P"); + _params_handles.yaw_rate_p = param_find("MC_YAWRATE_P"); + _params_handles.yaw_rate_i = param_find("MC_YAWRATE_I"); + _params_handles.yaw_rate_d = param_find("MC_YAWRATE_D"); + _params_handles.yaw_ff = param_find("MC_YAW_FF"); + + _params_handles.rc_scale_yaw = param_find("RC_SCALE_YAW"); + + /* fetch initial parameter values */ + parameters_update(); +} + +MulticopterAttitudeControl::~MulticopterAttitudeControl() +{ + if (_control_task != -1) { + /* task wakes up every 100ms or so at the longest */ + _task_should_exit = true; + + /* wait for a second for the task to quit at our request */ + unsigned i = 0; + + do { + /* wait 20ms */ + usleep(20000); + + /* if we have given up, kill it */ + if (++i > 50) { + task_delete(_control_task); + break; + } + } while (_control_task != -1); + } + + mc_att_control::g_control = nullptr; +} + +int +MulticopterAttitudeControl::parameters_update() +{ + float v; + + /* roll */ + param_get(_params_handles.roll_p, &v); + _params.att_p(0) = v; + param_get(_params_handles.roll_rate_p, &v); + _params.rate_p(0) = v; + param_get(_params_handles.roll_rate_i, &v); + _params.rate_i(0) = v; + param_get(_params_handles.roll_rate_d, &v); + _params.rate_d(0) = v; + + /* pitch */ + param_get(_params_handles.pitch_p, &v); + _params.att_p(1) = v; + param_get(_params_handles.pitch_rate_p, &v); + _params.rate_p(1) = v; + param_get(_params_handles.pitch_rate_i, &v); + _params.rate_i(1) = v; + param_get(_params_handles.pitch_rate_d, &v); + _params.rate_d(1) = v; + + /* yaw */ + param_get(_params_handles.yaw_p, &v); + _params.att_p(2) = v; + param_get(_params_handles.yaw_rate_p, &v); + _params.rate_p(2) = v; + param_get(_params_handles.yaw_rate_i, &v); + _params.rate_i(2) = v; + param_get(_params_handles.yaw_rate_d, &v); + _params.rate_d(2) = v; + + param_get(_params_handles.yaw_ff, &_params.yaw_ff); + + param_get(_params_handles.rc_scale_yaw, &_params.rc_scale_yaw); + + return OK; +} + +void +MulticopterAttitudeControl::parameter_update_poll() +{ + bool updated; + + /* Check HIL state if vehicle status has changed */ + orb_check(_params_sub, &updated); + + if (updated) { + struct parameter_update_s param_update; + orb_copy(ORB_ID(parameter_update), _params_sub, ¶m_update); + parameters_update(); + } +} + +void +MulticopterAttitudeControl::vehicle_control_mode_poll() +{ + bool updated; + + /* Check HIL state if vehicle status has changed */ + orb_check(_v_control_mode_sub, &updated); + + if (updated) { + orb_copy(ORB_ID(vehicle_control_mode), _v_control_mode_sub, &_v_control_mode); + } +} + +void +MulticopterAttitudeControl::vehicle_manual_poll() +{ + bool updated; + + /* get pilots inputs */ + orb_check(_manual_control_sp_sub, &updated); + + if (updated) { + + orb_copy(ORB_ID(manual_control_setpoint), _manual_control_sp_sub, &_manual_control_sp); + } +} + +void +MulticopterAttitudeControl::vehicle_attitude_setpoint_poll() +{ + /* check if there is a new setpoint */ + bool updated; + orb_check(_v_att_sp_sub, &updated); + + if (updated) { + orb_copy(ORB_ID(vehicle_attitude_setpoint), _v_att_sp_sub, &_v_att_sp); + } +} + +void +MulticopterAttitudeControl::vehicle_rates_setpoint_poll() +{ + /* check if there is a new setpoint */ + bool updated; + orb_check(_v_rates_sp_sub, &updated); + + if (updated) { + orb_copy(ORB_ID(vehicle_rates_setpoint), _v_rates_sp_sub, &_v_rates_sp); + } +} + +void +MulticopterAttitudeControl::arming_status_poll() +{ + /* check if there is a new setpoint */ + bool updated; + orb_check(_armed_sub, &updated); + + if (updated) { + orb_copy(ORB_ID(actuator_armed), _armed_sub, &_armed); + } +} + +/* + * Attitude controller. + * Input: 'manual_control_setpoint' and 'vehicle_attitude_setpoint' topics (depending on mode) + * Output: '_rates_sp' vector, '_thrust_sp', 'vehicle_attitude_setpoint' topic (for manual modes) + */ +void +MulticopterAttitudeControl::control_attitude(float dt) +{ + float yaw_sp_move_rate = 0.0f; + bool publish_att_sp = false; + + if (_v_control_mode.flag_control_manual_enabled) { + /* manual input, set or modify attitude setpoint */ + + if (_v_control_mode.flag_control_velocity_enabled || _v_control_mode.flag_control_climb_rate_enabled) { + /* in assisted modes poll 'vehicle_attitude_setpoint' topic and modify it */ + vehicle_attitude_setpoint_poll(); + } + + if (!_v_control_mode.flag_control_climb_rate_enabled) { + /* pass throttle directly if not in altitude stabilized mode */ + _v_att_sp.thrust = _manual_control_sp.throttle; + publish_att_sp = true; + } + + if (!_armed.armed) { + /* reset yaw setpoint when disarmed */ + _reset_yaw_sp = true; + } + + /* move yaw setpoint in all modes */ + if (_v_att_sp.thrust < 0.1f) { + // TODO + //if (_status.condition_landed) { + /* reset yaw setpoint if on ground */ + // reset_yaw_sp = true; + //} + } else { + float yaw_dz_scaled = YAW_DEADZONE * _params.rc_scale_yaw; + + if (_params.rc_scale_yaw > 0.001f && fabs(_manual_control_sp.yaw) > yaw_dz_scaled) { + /* move yaw setpoint */ + yaw_sp_move_rate = _manual_control_sp.yaw / _params.rc_scale_yaw; + + if (_manual_control_sp.yaw > 0.0f) { + yaw_sp_move_rate -= YAW_DEADZONE; + + } else { + yaw_sp_move_rate += YAW_DEADZONE; + } + + yaw_sp_move_rate *= _params.rc_scale_yaw; + _v_att_sp.yaw_body = _wrap_pi(_v_att_sp.yaw_body + yaw_sp_move_rate * dt); + _v_att_sp.R_valid = false; + publish_att_sp = true; + } + } + + /* reset yaw setpint to current position if needed */ + if (_reset_yaw_sp) { + _reset_yaw_sp = false; + _v_att_sp.yaw_body = _v_att.yaw; + _v_att_sp.R_valid = false; + publish_att_sp = true; + } + + if (!_v_control_mode.flag_control_velocity_enabled) { + /* update attitude setpoint if not in position control mode */ + _v_att_sp.roll_body = _manual_control_sp.roll; + _v_att_sp.pitch_body = _manual_control_sp.pitch; + _v_att_sp.R_valid = false; + publish_att_sp = true; + } + + } else { + /* in non-manual mode use 'vehicle_attitude_setpoint' topic */ + vehicle_attitude_setpoint_poll(); + + /* reset yaw setpoint after non-manual control mode */ + _reset_yaw_sp = true; + } + + _thrust_sp = _v_att_sp.thrust; + + /* construct attitude setpoint rotation matrix */ + if (_v_att_sp.R_valid) { + /* rotation matrix in _att_sp is valid, use it */ + _R_sp.set(&_v_att_sp.R_body[0][0]); + + } else { + /* rotation matrix in _att_sp is not valid, use euler angles instead */ + _R_sp.from_euler(_v_att_sp.roll_body, _v_att_sp.pitch_body, _v_att_sp.yaw_body); + + /* copy rotation matrix back to setpoint struct */ + memcpy(&_v_att_sp.R_body[0][0], &_R_sp.data[0][0], sizeof(_v_att_sp.R_body)); + _v_att_sp.R_valid = true; + } + + /* publish the attitude setpoint if needed */ + if (publish_att_sp) { + _v_att_sp.timestamp = hrt_absolute_time(); + + if (_att_sp_pub > 0) { + orb_publish(ORB_ID(vehicle_attitude_setpoint), _att_sp_pub, &_v_att_sp); + + } else { + _att_sp_pub = orb_advertise(ORB_ID(vehicle_attitude_setpoint), &_v_att_sp); + } + } + + /* rotation matrix for current state */ + _R.set(_v_att.R); + + /* all input data is ready, run controller itself */ + + /* try to move thrust vector shortest way, because yaw response is slower than roll/pitch */ + math::Vector<3> R_z(_R(0, 2), _R(1, 2), _R(2, 2)); + math::Vector<3> R_sp_z(_R_sp(0, 2), _R_sp(1, 2), _R_sp(2, 2)); + + /* axis and sin(angle) of desired rotation */ + math::Vector<3> e_R = _R.transposed() * (R_z % R_sp_z); + + /* calculate angle error */ + float e_R_z_sin = e_R.length(); + float e_R_z_cos = R_z * R_sp_z; + + /* calculate weight for yaw control */ + float yaw_w = _R_sp(2, 2) * _R_sp(2, 2); + + /* calculate rotation matrix after roll/pitch only rotation */ + math::Matrix<3, 3> R_rp; + + if (e_R_z_sin > 0.0f) { + /* get axis-angle representation */ + float e_R_z_angle = atan2f(e_R_z_sin, e_R_z_cos); + math::Vector<3> e_R_z_axis = e_R / e_R_z_sin; + + e_R = e_R_z_axis * e_R_z_angle; + + /* cross product matrix for e_R_axis */ + math::Matrix<3, 3> e_R_cp; + e_R_cp.zero(); + e_R_cp(0, 1) = -e_R_z_axis(2); + e_R_cp(0, 2) = e_R_z_axis(1); + e_R_cp(1, 0) = e_R_z_axis(2); + e_R_cp(1, 2) = -e_R_z_axis(0); + e_R_cp(2, 0) = -e_R_z_axis(1); + e_R_cp(2, 1) = e_R_z_axis(0); + + /* rotation matrix for roll/pitch only rotation */ + R_rp = _R * (I + e_R_cp * e_R_z_sin + e_R_cp * e_R_cp * (1.0f - e_R_z_cos)); + + } else { + /* zero roll/pitch rotation */ + R_rp = _R; + } + + /* R_rp and _R_sp has the same Z axis, calculate yaw error */ + math::Vector<3> R_sp_x(_R_sp(0, 0), _R_sp(1, 0), _R_sp(2, 0)); + math::Vector<3> R_rp_x(R_rp(0, 0), R_rp(1, 0), R_rp(2, 0)); + e_R(2) = atan2f((R_rp_x % R_sp_x) * R_sp_z, R_rp_x * R_sp_x) * yaw_w; + + if (e_R_z_cos < 0.0f) { + /* for large thrust vector rotations use another rotation method: + * calculate angle and axis for R -> R_sp rotation directly */ + math::Quaternion q; + q.from_dcm(_R.transposed() * _R_sp); + math::Vector<3> e_R_d = q.imag(); + e_R_d.normalize(); + e_R_d *= 2.0f * atan2f(e_R_d.length(), q(0)); + + /* use fusion of Z axis based rotation and direct rotation */ + float direct_w = e_R_z_cos * e_R_z_cos * yaw_w; + e_R = e_R * (1.0f - direct_w) + e_R_d * direct_w; + } + + /* calculate angular rates setpoint */ + _rates_sp = _params.att_p.emult(e_R); + + /* feed forward yaw setpoint rate */ + _rates_sp(2) += yaw_sp_move_rate * yaw_w * _params.yaw_ff; +} + +/* + * Attitude rates controller. + * Input: '_rates_sp' vector, '_thrust_sp' + * Output: '_att_control' vector + */ +void +MulticopterAttitudeControl::control_attitude_rates(float dt) +{ + /* reset integral if disarmed */ + if (!_armed.armed) { + _rates_int.zero(); + } + + /* current body angular rates */ + math::Vector<3> rates; + rates(0) = _v_att.rollspeed; + rates(1) = _v_att.pitchspeed; + rates(2) = _v_att.yawspeed; + + /* angular rates error */ + math::Vector<3> rates_err = _rates_sp - rates; + _att_control = _params.rate_p.emult(rates_err) + _params.rate_d.emult(_rates_prev - rates) / dt + _rates_int; + _rates_prev = rates; + + /* update integral only if not saturated on low limit */ + if (_thrust_sp > 0.1f) { + for (int i = 0; i < 3; i++) { + if (fabsf(_att_control(i)) < _thrust_sp) { + float rate_i = _rates_int(i) + _params.rate_i(i) * rates_err(i) * dt; + + if (isfinite(rate_i) && rate_i > -RATES_I_LIMIT && rate_i < RATES_I_LIMIT && + _att_control(i) > -RATES_I_LIMIT && _att_control(i) < RATES_I_LIMIT) { + _rates_int(i) = rate_i; + } + } + } + } +} + +void +MulticopterAttitudeControl::task_main_trampoline(int argc, char *argv[]) +{ + mc_att_control::g_control->task_main(); +} + +void +MulticopterAttitudeControl::task_main() +{ + warnx("started"); + fflush(stdout); + + /* + * do subscriptions + */ + _v_att_sp_sub = orb_subscribe(ORB_ID(vehicle_attitude_setpoint)); + _v_rates_sp_sub = orb_subscribe(ORB_ID(vehicle_rates_setpoint)); + _v_att_sub = orb_subscribe(ORB_ID(vehicle_attitude)); + _v_control_mode_sub = orb_subscribe(ORB_ID(vehicle_control_mode)); + _params_sub = orb_subscribe(ORB_ID(parameter_update)); + _manual_control_sp_sub = orb_subscribe(ORB_ID(manual_control_setpoint)); + _armed_sub = orb_subscribe(ORB_ID(actuator_armed)); + + /* rate limit attitude updates to 200Hz, failsafe against spam, normally runs at the same rate as attitude estimator */ + orb_set_interval(_v_att_sub, 5); + + /* initialize parameters cache */ + parameters_update(); + + /* wakeup source: vehicle attitude */ + struct pollfd fds[1]; + + fds[0].fd = _v_att_sub; + fds[0].events = POLLIN; + + while (!_task_should_exit) { + + /* wait for up to 100ms for data */ + int pret = poll(&fds[0], (sizeof(fds) / sizeof(fds[0])), 100); + + /* timed out - periodic check for _task_should_exit */ + if (pret == 0) + continue; + + /* this is undesirable but not much we can do - might want to flag unhappy status */ + if (pret < 0) { + warn("poll error %d, %d", pret, errno); + /* sleep a bit before next try */ + usleep(100000); + continue; + } + + perf_begin(_loop_perf); + + /* run controller on attitude changes */ + if (fds[0].revents & POLLIN) { + static uint64_t last_run = 0; + float dt = (hrt_absolute_time() - last_run) / 1000000.0f; + last_run = hrt_absolute_time(); + + /* guard against too small (< 2ms) and too large (> 20ms) dt's */ + if (dt < 0.002f) { + dt = 0.002f; + + } else if (dt > 0.02f) { + dt = 0.02f; + } + + /* copy attitude topic */ + orb_copy(ORB_ID(vehicle_attitude), _v_att_sub, &_v_att); + + /* check for updates in other topics */ + parameter_update_poll(); + vehicle_control_mode_poll(); + arming_status_poll(); + vehicle_manual_poll(); + + if (_v_control_mode.flag_control_attitude_enabled) { + control_attitude(dt); + + /* publish attitude rates setpoint */ + _v_rates_sp.roll = _rates_sp(0); + _v_rates_sp.pitch = _rates_sp(1); + _v_rates_sp.yaw = _rates_sp(2); + _v_rates_sp.thrust = _thrust_sp; + _v_rates_sp.timestamp = hrt_absolute_time(); + + if (_v_rates_sp_pub > 0) { + orb_publish(ORB_ID(vehicle_rates_setpoint), _v_rates_sp_pub, &_v_rates_sp); + + } else { + _v_rates_sp_pub = orb_advertise(ORB_ID(vehicle_rates_setpoint), &_v_rates_sp); + } + + } else { + /* attitude controller disabled */ + // TODO poll 'attitude_rates_setpoint' topic + _rates_sp.zero(); + _thrust_sp = 0.0f; + } + + if (_v_control_mode.flag_control_rates_enabled) { + control_attitude_rates(dt); + + /* publish actuator controls */ + _actuators.control[0] = (isfinite(_att_control(0))) ? _att_control(0) : 0.0f; + _actuators.control[1] = (isfinite(_att_control(1))) ? _att_control(1) : 0.0f; + _actuators.control[2] = (isfinite(_att_control(2))) ? _att_control(2) : 0.0f; + _actuators.control[3] = (isfinite(_thrust_sp)) ? _thrust_sp : 0.0f; + _actuators.timestamp = hrt_absolute_time(); + + if (_actuators_0_pub > 0) { + orb_publish(ORB_ID(actuator_controls_0), _actuators_0_pub, &_actuators); + + } else { + _actuators_0_pub = orb_advertise(ORB_ID(actuator_controls_0), &_actuators); + } + } + } + + perf_end(_loop_perf); + } + + warnx("exit"); + + _control_task = -1; + _exit(0); +} + +int +MulticopterAttitudeControl::start() +{ + ASSERT(_control_task == -1); + + /* start the task */ + _control_task = task_spawn_cmd("mc_att_control", + SCHED_DEFAULT, + SCHED_PRIORITY_MAX - 5, + 2048, + (main_t)&MulticopterAttitudeControl::task_main_trampoline, + nullptr); + + if (_control_task < 0) { + warn("task start failed"); + return -errno; + } + + return OK; +} + +int mc_att_control_main(int argc, char *argv[]) +{ + if (argc < 1) + errx(1, "usage: mc_att_control {start|stop|status}"); + + if (!strcmp(argv[1], "start")) { + + if (mc_att_control::g_control != nullptr) + errx(1, "already running"); + + mc_att_control::g_control = new MulticopterAttitudeControl; + + if (mc_att_control::g_control == nullptr) + errx(1, "alloc failed"); + + if (OK != mc_att_control::g_control->start()) { + delete mc_att_control::g_control; + mc_att_control::g_control = nullptr; + err(1, "start failed"); + } + + exit(0); + } + + if (!strcmp(argv[1], "stop")) { + if (mc_att_control::g_control == nullptr) + errx(1, "not running"); + + delete mc_att_control::g_control; + mc_att_control::g_control = nullptr; + exit(0); + } + + if (!strcmp(argv[1], "status")) { + if (mc_att_control::g_control) { + errx(0, "running"); + + } else { + errx(1, "not running"); + } + } + + warnx("unrecognized command"); + return 1; +} |