ardupilot/libraries/AC_Avoidance/AP_OAPathPlanner.cpp

241 lines
8.3 KiB
C++

/*
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, see <http://www.gnu.org/licenses/>.
*/
#include "AP_OAPathPlanner.h"
#include <AP_Math/AP_Math.h>
#include <AP_AHRS/AP_AHRS.h>
#include <AC_Fence/AC_Fence.h>
#include <AP_Logger/AP_Logger.h>
#include "AP_OABendyRuler.h"
#include "AP_OADijkstra.h"
extern const AP_HAL::HAL &hal;
// parameter defaults
const float OA_LOOKAHEAD_DEFAULT = 50;
const float OA_MARGIN_MAX_DEFAULT = 10;
const int16_t OA_TIMEOUT_MS = 2000; // avoidance results over 2 seconds old are ignored
const AP_Param::GroupInfo AP_OAPathPlanner::var_info[] = {
// @Param: TYPE
// @DisplayName: Object Avoidance Path Planning algorithm to use
// @Description: Enabled/disable path planning around obstacles
// @Values: 0:Disabled,1:BendyRuler,2:Dijkstra
// @User: Standard
AP_GROUPINFO_FLAGS("TYPE", 1, AP_OAPathPlanner, _type, OA_PATHPLAN_DISABLED, AP_PARAM_FLAG_ENABLE),
// @Param: LOOKAHEAD
// @DisplayName: Object Avoidance look ahead distance maximum
// @Description: Object Avoidance will look this many meters ahead of vehicle
// @Units: m
// @Range: 1 100
// @Increment: 1
// @User: Standard
AP_GROUPINFO("LOOKAHEAD", 2, AP_OAPathPlanner, _lookahead, OA_LOOKAHEAD_DEFAULT),
// @Param: MARGIN_MAX
// @DisplayName: Object Avoidance wide margin distance
// @Description: Object Avoidance will ignore objects more than this many meters from vehicle
// @Units: m
// @Range: 1 100
// @Increment: 1
// @User: Standard
AP_GROUPINFO("MARGIN_MAX", 3, AP_OAPathPlanner, _margin_max, OA_MARGIN_MAX_DEFAULT),
AP_GROUPEND
};
/// Constructor
AP_OAPathPlanner::AP_OAPathPlanner()
{
_singleton = this;
AP_Param::setup_object_defaults(this, var_info);
}
// perform any required initialisation
void AP_OAPathPlanner::init()
{
// run background task looking for best alternative destination
switch (_type) {
case OA_PATHPLAN_DISABLED:
// do nothing
break;
case OA_PATHPLAN_BENDYRULER:
if (_oabendyruler == nullptr) {
_oabendyruler = new AP_OABendyRuler();
}
break;
case OA_PATHPLAN_DIJKSTRA:
if (_oadijkstra == nullptr) {
_oadijkstra = new AP_OADijkstra();
}
break;
}
}
// pre-arm checks that algorithms have been initialised successfully
bool AP_OAPathPlanner::pre_arm_check(char *failure_msg, uint8_t failure_msg_len) const
{
// check if initialisation has succeeded
switch (_type) {
case OA_PATHPLAN_DISABLED:
// do nothing
break;
case OA_PATHPLAN_BENDYRULER:
if (_oabendyruler == nullptr) {
hal.util->snprintf(failure_msg, failure_msg_len, "BendyRuler OA requires reboot");
return false;
}
break;
case OA_PATHPLAN_DIJKSTRA:
if (_oadijkstra == nullptr) {
hal.util->snprintf(failure_msg, failure_msg_len, "Dijkstra OA requires reboot");
return false;
}
break;
}
return true;
}
// provides an alternative target location if path planning around obstacles is required
// returns true and updates result_loc with an intermediate location
bool AP_OAPathPlanner::mission_avoidance(const Location &current_loc,
const Location &origin,
const Location &destination,
Location &result_origin,
Location &result_destination)
{
// exit immediately if disabled
if (_type == OA_PATHPLAN_DISABLED) {
return false;
}
WITH_SEMAPHORE(_rsem);
if (!_thread_created) {
// create the avoidance thread as low priority. It should soak
// up spare CPU cycles to fill in the avoidance_result structure based
// on requests in avoidance_request
if (!hal.scheduler->thread_create(FUNCTOR_BIND_MEMBER(&AP_OAPathPlanner::avoidance_thread, void),
"avoidance",
8192, AP_HAL::Scheduler::PRIORITY_IO, -1)) {
return false;
}
_thread_created = true;
}
const uint32_t now = AP_HAL::millis();
// place new request for the thread to work on
avoidance_request.current_loc = current_loc;
avoidance_request.origin = origin;
avoidance_request.destination = destination;
avoidance_request.ground_speed_vec = AP::ahrs().groundspeed_vector();
avoidance_request.request_time_ms = now;
// return results from background thread's latest checks
if (destination.lat == avoidance_result.destination.lat &&
destination.lng == avoidance_result.destination.lng &&
now - avoidance_result.result_time_ms < OA_TIMEOUT_MS) {
// we have a result from the thread
result_origin = avoidance_result.origin_new;
result_destination = avoidance_result.destination_new;
// log result
if (avoidance_result.result_time_ms != _logged_time_ms) {
_logged_time_ms = avoidance_result.result_time_ms;
AP::logger().Write_OA(_type, destination, result_destination);
}
return avoidance_result.avoidance_needed;
}
// do not performance avoidance because background thread's results were
// run against a different destination or they are simply not required
return false;
}
// avoidance thread that continually updates the avoidance_result structure based on avoidance_request
void AP_OAPathPlanner::avoidance_thread()
{
while (true) {
// run at 10hz or less
hal.scheduler->delay(100);
Location origin_new;
Location destination_new;
{
WITH_SEMAPHORE(_rsem);
uint32_t now = AP_HAL::millis();
if (now - avoidance_request.request_time_ms > OA_TIMEOUT_MS) {
// this is a very old request, don't process it
continue;
}
// copy request to avoid conflict with main thread
avoidance_request2 = avoidance_request;
// store passed in origin and destination so we can return it if object avoidance is not required
origin_new = avoidance_request.origin;
destination_new = avoidance_request.destination;
}
// run background task looking for best alternative destination
bool res = false;
switch (_type) {
case OA_PATHPLAN_DISABLED:
continue;
case OA_PATHPLAN_BENDYRULER:
if (_oabendyruler == nullptr) {
continue;
}
_oabendyruler->set_config(_lookahead, _margin_max);
res = _oabendyruler->update(avoidance_request2.current_loc, avoidance_request2.destination, avoidance_request2.ground_speed_vec, origin_new, destination_new);
break;
case OA_PATHPLAN_DIJKSTRA:
if (_oadijkstra == nullptr) {
continue;
}
_oadijkstra->set_fence_margin(_margin_max);
res = _oadijkstra->update(avoidance_request2.current_loc, avoidance_request2.destination, origin_new, destination_new);
break;
}
{
// give the main thread the avoidance result
WITH_SEMAPHORE(_rsem);
avoidance_result.destination = avoidance_request2.destination;
avoidance_result.origin_new = res ? origin_new : avoidance_result.origin_new;
avoidance_result.destination_new = res ? destination_new : avoidance_result.destination;
avoidance_result.result_time_ms = AP_HAL::millis();
avoidance_result.avoidance_needed = res;
}
}
}
// singleton instance
AP_OAPathPlanner *AP_OAPathPlanner::_singleton;
namespace AP {
AP_OAPathPlanner *ap_oapathplanner()
{
return AP_OAPathPlanner::get_singleton();
}
}