ardupilot/libraries/APO/AP_Navigator.cpp

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

#include "AP_Navigator.h"
#include "../FastSerial/FastSerial.h"
#include "AP_HardwareAbstractionLayer.h"
#include "../AP_DCM/AP_DCM.h"
#include "../AP_Math/AP_Math.h"
#include "../AP_Compass/AP_Compass.h"
#include "AP_MavlinkCommand.h"
#include "AP_Var_keys.h"
#include "../AP_RangeFinder/AP_RangeFinder.h"
#include "../AP_IMU/AP_IMU.h"
#include "../APM_BMP085/APM_BMP085.h"

namespace apo {

AP_Navigator::AP_Navigator(AP_HardwareAbstractionLayer * hal) :
    _hal(hal), _timeStamp(0), _roll(0), _rollRate(0), _pitch(0),
    _pitchRate(0), _yaw(0), _yawRate(0), _airSpeed(0),
    _groundSpeed(0), _vD(0), _lat_degInt(0),
    _lon_degInt(0), _alt_intM(0) {
}
void AP_Navigator::calibrate() {
}
float AP_Navigator::getPD() const {
    return AP_MavlinkCommand::home.getPD(getAlt_intM());
}

float AP_Navigator::getPE() const {
    return AP_MavlinkCommand::home.getPE(getLat_degInt(), getLon_degInt());
}

float AP_Navigator::getPN() const {
    return AP_MavlinkCommand::home.getPN(getLat_degInt(), getLon_degInt());
}

void AP_Navigator::setPD(float _pD) {
    setAlt(AP_MavlinkCommand::home.getAlt(_pD));
}

void AP_Navigator::setPE(float _pE) {
    setLat(AP_MavlinkCommand::home.getLat(_pE));
}

void AP_Navigator::setPN(float _pN) {
    setLon(AP_MavlinkCommand::home.getLon(_pN));
}

DcmNavigator::DcmNavigator(AP_HardwareAbstractionLayer * hal) :
    AP_Navigator(hal), _dcm(), _imuOffsetAddress(0) {

    // if orientation equal to front, store as front
    /**
     * rangeFinder<direction> is assigned values based on orientation which
     * is specified in ArduPilotOne.pde.
     */
    for (uint8_t i = 0; i < _hal-> rangeFinders.getSize(); i++) {
        if (_hal->rangeFinders[i] == NULL)
            continue;
        if (_hal->rangeFinders[i]->orientation_x == 0
                && _hal->rangeFinders[i]->orientation_y == 0
                && _hal->rangeFinders[i]->orientation_z == 1)
            _rangeFinderDown = _hal->rangeFinders[i];
    }

    if (_hal->getMode() == MODE_LIVE) {

        if (_hal->adc) {
            _hal->imu = new AP_IMU_Oilpan(_hal->adc, k_sensorCalib);
        }

        if (_hal->imu) {
            _dcm = new AP_DCM(_hal->imu, _hal->gps, _hal->compass);

            // tune down dcm
            _dcm->kp_roll_pitch(0.030000);
            _dcm->ki_roll_pitch(0.00001278),	// 50 hz I term

                 // tune down compass in dcm
                 _dcm->kp_yaw(0.08);
            _dcm->ki_yaw(0);
        }

        if (_hal->compass) {
            _dcm->set_compass(_hal->compass);
        }
    }
}
void DcmNavigator::calibrate() {

    AP_Navigator::calibrate();

    // TODO: handle cold/warm restart
    if (_hal->imu) {
        _hal->imu->init(IMU::COLD_START,delay);
    }
}
void DcmNavigator::updateFast(float dt) {

    if (_hal->getMode() != MODE_LIVE)
        return;

    setTimeStamp(micros()); // if running in live mode, record new time stamp


    //_hal->debug->println_P(PSTR("nav loop"));

    /**
     * The altitued is read off the barometer by implementing the following formula:
     * altitude (in m) = 44330*(1-(p/po)^(1/5.255)),
     * where, po is pressure in Pa at sea level (101325 Pa).
     * See http://www.sparkfun.com/tutorials/253 or type this formula
     * in a search engine for more information.
     * altInt contains the altitude in meters.
     */
    if (_hal->baro) {

        if (_rangeFinderDown != NULL && _rangeFinderDown->distance <= 695)
            setAlt(_rangeFinderDown->distance);

        else {
            float tmp = (_hal->baro->Press / 101325.0);
            tmp = pow(tmp, 0.190295);
            //setAlt(44330 * (1.0 - tmp)); //sets the altitude in meters XXX wrong, baro reads 0 press
            setAlt(0.0);
        }
    }

    // dcm class for attitude
    if (_dcm) {
        _dcm->update_DCM_fast();
        setRoll(_dcm->roll);
        setPitch(_dcm->pitch);
        setYaw(_dcm->yaw);
        setRollRate(_dcm->get_gyro().x);
        setPitchRate(_dcm->get_gyro().y);
        setYawRate(_dcm->get_gyro().z);

        /*
         * accel/gyro debug
         */
        /*
         Vector3f accel = _hal->imu->get_accel();
         Vector3f gyro = _hal->imu->get_gyro();
         Serial.printf_P(PSTR("accel: %f %f %f gyro: %f %f %f\n"),
         accel.x,accel.y,accel.z,gyro.x,gyro.y,gyro.z);
         */
    }
}
void DcmNavigator::updateSlow(float dt) {
    if (_hal->getMode() != MODE_LIVE)
        return;

    setTimeStamp(micros()); // if running in live mode, record new time stamp

    if (_hal->gps) {
        _hal->gps->update();
        updateGpsLight();
        if (_hal->gps->fix && _hal->gps->new_data) {
            setLat_degInt(_hal->gps->latitude);
            setLon_degInt(_hal->gps->longitude);
            setAlt_intM(_hal->gps->altitude * 10); // gps in cm, intM in mm
            setGroundSpeed(_hal->gps->ground_speed / 100.0); // gps is in cm/s
        }
    }

    if (_hal->compass) {
        _hal->compass->read();
        _hal->compass->calculate(_dcm->get_dcm_matrix());
        _hal->compass->null_offsets(_dcm->get_dcm_matrix());
        //_hal->debug->printf_P(PSTR("heading: %f"), _hal->compass->heading);
    }
}
void DcmNavigator::updateGpsLight(void) {
    // GPS LED on if we have a fix or Blink GPS LED if we are receiving data
    // ---------------------------------------------------------------------
    static bool GPS_light = false;
    switch (_hal->gps->status()) {
    case (2):
        //digitalWrite(C_LED_PIN, HIGH); //Turn LED C on when gps has valid fix.
        break;

    case (1):
        if (_hal->gps->valid_read == true) {
            GPS_light = !GPS_light; // Toggle light on and off to indicate gps messages being received, but no GPS fix lock
            if (GPS_light) {
                digitalWrite(_hal->cLedPin, LOW);
            } else {
                digitalWrite(_hal->cLedPin, HIGH);
            }
            _hal->gps->valid_read = false;
        }
        break;

    default:
        digitalWrite(_hal->cLedPin, LOW);
        break;
    }
}

} // namespace apo