zr-v4/libraries/APO/AP_Guide.cpp

/*
 * AP_Guide.cpp
 *
 *  Created on: Apr 30, 2011
 *      Author: jgoppert
 */

#include "AP_Guide.h"
#include "../FastSerial/FastSerial.h"
#include "AP_Navigator.h"
#include "constants.h"
#include "AP_HardwareAbstractionLayer.h"
#include "AP_CommLink.h"

namespace apo {

AP_Guide::AP_Guide(AP_Navigator * navigator, AP_HardwareAbstractionLayer * hal) :
	_navigator(navigator), _hal(hal), _command(AP_MavlinkCommand::home), 
			_previousCommand(AP_MavlinkCommand::home),
			_headingCommand(0), _airSpeedCommand(0),
			_groundSpeedCommand(0), _altitudeCommand(0), _pNCmd(0),
			_pECmd(0), _pDCmd(0), _mode(MAV_NAV_LOST),
			_numberOfCommands(1), _cmdIndex(0), _nextCommandCalls(0),
			_nextCommandTimer(0) {
}

void AP_Guide::setCurrentIndex(uint8_t val){
	_cmdIndex.set_and_save(val);
	_command = AP_MavlinkCommand(getCurrentIndex());
	_previousCommand = AP_MavlinkCommand(getPreviousIndex());
	_hal->gcs->sendMessage(MAVLINK_MSG_ID_WAYPOINT_CURRENT);
}

MavlinkGuide::MavlinkGuide(AP_Navigator * navigator,
		AP_HardwareAbstractionLayer * hal) :
	AP_Guide(navigator, hal), _rangeFinderFront(), _rangeFinderBack(),
			_rangeFinderLeft(), _rangeFinderRight(),
			_group(k_guide, PSTR("guide_")),
			_velocityCommand(&_group, 1, 1, PSTR("velCmd")),
			_crossTrackGain(&_group, 2, 1, PSTR("xt")),
			_crossTrackLim(&_group, 3, 90, PSTR("xtLim")) {

	for (uint8_t i = 0; i < _hal->rangeFinders.getSize(); i++) {
		RangeFinder * rF = _hal->rangeFinders[i];
		if (rF == NULL)
			continue;
		if (rF->orientation_x == 1 && rF->orientation_y == 0
				&& rF->orientation_z == 0)
			_rangeFinderFront = rF;
		else if (rF->orientation_x == -1 && rF->orientation_y == 0
				&& rF->orientation_z == 0)
			_rangeFinderBack = rF;
		else if (rF->orientation_x == 0 && rF->orientation_y == 1
				&& rF->orientation_z == 0)
			_rangeFinderRight = rF;
		else if (rF->orientation_x == 0 && rF->orientation_y == -1
				&& rF->orientation_z == 0)
			_rangeFinderLeft = rF;

	}
}

void MavlinkGuide::update() {
	// process mavlink commands
	handleCommand();

	// obstacle avoidance overrides
	// stop if your going to drive into something in front of you
	for (uint8_t i = 0; i < _hal->rangeFinders.getSize(); i++)
		_hal->rangeFinders[i]->read();
	float frontDistance = _rangeFinderFront->distance / 200.0; //convert for other adc
	if (_rangeFinderFront && frontDistance < 2) {
		_mode = MAV_NAV_VECTOR;

		//airSpeedCommand = 0;
		//groundSpeedCommand = 0;
//			_headingCommand -= 45 * deg2Rad;
//			_hal->debug->print("Obstacle Distance (m): ");
//			_hal->debug->println(frontDistance);
//			_hal->debug->print("Obstacle avoidance Heading Command: ");
//			_hal->debug->println(headingCommand);
//			_hal->debug->printf_P(
//					PSTR("Front Distance, %f\n"),
//					frontDistance);
	}
	if (_rangeFinderBack && _rangeFinderBack->distance < 5) {
		_airSpeedCommand = 0;
		_groundSpeedCommand = 0;

	}

	if (_rangeFinderLeft && _rangeFinderLeft->distance < 5) {
		_airSpeedCommand = 0;
		_groundSpeedCommand = 0;
	}

	if (_rangeFinderRight && _rangeFinderRight->distance < 5) {
		_airSpeedCommand = 0;
		_groundSpeedCommand = 0;
	}
}

void MavlinkGuide::nextCommand() {
	// within 1 seconds, check if more than 5 calls to next command occur
	// if they do, go to home waypoint
	if (millis() - _nextCommandTimer < 1000) {
		if (_nextCommandCalls > 5) {
			Serial.println("commands loading too fast, returning home");
			setCurrentIndex(0);
			setNumberOfCommands(1);
			_nextCommandCalls = 0;
			_nextCommandTimer = millis();
			return;
		}
		_nextCommandCalls++;
	} else {
		_nextCommandTimer = millis();
		_nextCommandCalls = 0;
	}

	_cmdIndex = getNextIndex();
	//Serial.print("cmd       : "); Serial.println(int(_cmdIndex));
	//Serial.print("cmd prev  : "); Serial.println(int(getPreviousIndex()));
	//Serial.print("cmd num    : "); Serial.println(int(getNumberOfCommands()));
	_command = AP_MavlinkCommand(getCurrentIndex());
	_previousCommand = AP_MavlinkCommand(getPreviousIndex());
}

void MavlinkGuide::handleCommand() {

	// TODO handle more commands
	switch (_command.getCommand()) {

	case MAV_CMD_NAV_WAYPOINT: {

		// if we don't have enough waypoint for cross track calcs
		// go home
		if (_numberOfCommands == 1) {
			_mode = MAV_NAV_RETURNING;
			_altitudeCommand = AP_MavlinkCommand::home.getAlt();
			_headingCommand = AP_MavlinkCommand::home.bearingTo(
					_navigator->getLat_degInt(), _navigator->getLon_degInt())
					+ 180 * deg2Rad;
			if (_headingCommand > 360 * deg2Rad)
				_headingCommand -= 360 * deg2Rad;

			//_hal->debug->printf_P(PSTR("going home: bearing: %f distance: %f\n"),
			//headingCommand,AP_MavlinkCommand::home.distanceTo(_navigator->getLat_degInt(),_navigator->getLon_degInt()));
			
		// if we have 2 or more waypoints do x track navigation
		} else {
			_mode = MAV_NAV_WAYPOINT;
			float alongTrack = _command.alongTrack(_previousCommand,
					_navigator->getLat_degInt(),
					_navigator->getLon_degInt());
			float distanceToNext = _command.distanceTo(
					_navigator->getLat_degInt(), _navigator->getLon_degInt());
			float segmentLength = _previousCommand.distanceTo(_command);
			if (distanceToNext < _command.getRadius() || alongTrack
					> segmentLength)
			{
				Serial.println("waypoint reached");
				nextCommand();
			}
			_altitudeCommand = _command.getAlt();
			float dXt = _command.crossTrack(_previousCommand,
					_navigator->getLat_degInt(),
					_navigator->getLon_degInt());
			float temp = dXt * _crossTrackGain * deg2Rad; // crosstrack gain, rad/m
			if (temp > _crossTrackLim * deg2Rad)
				temp = _crossTrackLim * deg2Rad;
			if (temp < -_crossTrackLim * deg2Rad)
				temp = -_crossTrackLim * deg2Rad;
			float bearing = _previousCommand.bearingTo(_command);
			_headingCommand = bearing - temp;
			//_hal->debug->printf_P(
					//PSTR("nav: bCurrent2Dest: %f\tdXt: %f\tcmdHeading: %f\tnextWpDistance: %f\talongTrack: %f\n"),
					//bearing * rad2Deg, dXt, _headingCommand * rad2Deg, distanceToNext, alongTrack);
		}

		_groundSpeedCommand = _velocityCommand;

		// calculate pN,pE,pD from home and gps coordinates
		_pNCmd = _command.getPN(_navigator->getLat_degInt(),
				_navigator->getLon_degInt());
		_pECmd = _command.getPE(_navigator->getLat_degInt(),
				_navigator->getLon_degInt());
		_pDCmd = _command.getPD(_navigator->getAlt_intM());

		// debug 
		//_hal->debug->printf_P(
			//PSTR("guide loop, number: %d, current index: %d, previous index: %d\n"),
			//getNumberOfCommands(),
			//getCurrentIndex(),
			//getPreviousIndex());

		break;
	}
//		case MAV_CMD_CONDITION_CHANGE_ALT:
//		case MAV_CMD_CONDITION_DELAY:
//		case MAV_CMD_CONDITION_DISTANCE:
//		case MAV_CMD_CONDITION_LAST:
//		case MAV_CMD_CONDITION_YAW:
//		case MAV_CMD_DO_CHANGE_SPEED:
//		case MAV_CMD_DO_CONTROL_VIDEO:
//		case MAV_CMD_DO_JUMP:
//	    case MAV_CMD_DO_LAST:
//		case MAV_CMD_DO_LAST:
//		case MAV_CMD_DO_REPEAT_RELAY:
//		case MAV_CMD_DO_REPEAT_SERVO:
//		case MAV_CMD_DO_SET_HOME:
//		case MAV_CMD_DO_SET_MODE:
//		case MAV_CMD_DO_SET_PARAMETER:
//		case MAV_CMD_DO_SET_RELAY:
//		case MAV_CMD_DO_SET_SERVO:
//		case MAV_CMD_PREFLIGHT_CALIBRATION:
//		case MAV_CMD_PREFLIGHT_STORAGE:
//		case MAV_CMD_NAV_LAND:
//		case MAV_CMD_NAV_LAST:
//		case MAV_CMD_NAV_LOITER_TIME:
//		case MAV_CMD_NAV_LOITER_TURNS:
//		case MAV_CMD_NAV_LOITER_UNLIM:
//		case MAV_CMD_NAV_ORIENTATION_TARGET:
//		case MAV_CMD_NAV_PATHPLANNING:
//		case MAV_CMD_NAV_RETURN_TO_LAUNCH:
//		case MAV_CMD_NAV_TAKEOFF:
	default:
		// unhandled command, skip
		Serial.println("unhandled command");
		nextCommand();
		break;
	}
}

} // namespace apo

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