mirror of https://github.com/ArduPilot/ardupilot
99 lines
3.4 KiB
Plaintext
99 lines
3.4 KiB
Plaintext
/*
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www.ArduCopter.com - www.DIYDrones.com
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Copyright (c) 2010. All rights reserved.
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An Open Source Arduino based multicopter.
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File : Navigation.pde
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Version : v1.0, Aug 27, 2010
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Author(s): ArduCopter Team
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Ted Carancho (aeroquad), Jose Julio, Jordi Muñoz,
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Jani Hirvinen, Ken McEwans, Roberto Navoni,
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Sandro Benigno, Chris Anderson
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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* ************************************************************** *
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ChangeLog:
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* ************************************************************** *
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TODO:
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- initial functions.
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* ************************************************************** */
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void read_GPS_data()
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{
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GPS_timer_old=GPS_timer; // Update GPS timer
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GPS_timer = millis();
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GPS_Dt = (GPS_timer-GPS_timer_old)*0.001; // GPS_Dt
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GPS.NewData=0; // We Reset the flag...
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// Write GPS data to DataFlash log
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Log_Write_GPS(GPS.Time, GPS.Lattitude,GPS.Longitude,GPS.Altitude,GPS.Altitude,GPS.Ground_Speed, GPS.Ground_Course, GPS.Fix, GPS.NumSats);
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//if (GPS.Fix >= 2)
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if (GPS.Fix)
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digitalWrite(LED_Red,HIGH); // GPS Fix => RED LED
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else
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digitalWrite(LED_Red,LOW);
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}
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/* GPS based Position control */
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void Position_control(long lat_dest, long lon_dest)
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{
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long Lon_diff;
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long Lat_diff;
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Lon_diff = lon_dest - GPS.Longitude;
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Lat_diff = lat_dest - GPS.Lattitude;
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// ROLL
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//Optimization : cos(yaw) = DCM_Matrix[0][0] ; sin(yaw) = DCM_Matrix[1][0]
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gps_err_roll = (float)Lon_diff * GEOG_CORRECTION_FACTOR * DCM_Matrix[0][0] - (float)Lat_diff * DCM_Matrix[1][0];
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gps_roll_D = (gps_err_roll-gps_err_roll_old) / GPS_Dt;
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gps_err_roll_old = gps_err_roll;
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gps_roll_I += gps_err_roll * GPS_Dt;
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gps_roll_I = constrain(gps_roll_I, -800, 800);
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command_gps_roll = KP_GPS_ROLL * gps_err_roll + KD_GPS_ROLL * gps_roll_D + KI_GPS_ROLL * gps_roll_I;
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command_gps_roll = constrain(command_gps_roll, -GPS_MAX_ANGLE, GPS_MAX_ANGLE); // Limit max command
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//Log_Write_PID(1,KP_GPS_ROLL*gps_err_roll*10,KI_GPS_ROLL*gps_roll_I*10,KD_GPS_ROLL*gps_roll_D*10,command_gps_roll*10);
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// PITCH
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gps_err_pitch = -(float)Lat_diff * DCM_Matrix[0][0] - (float)Lon_diff * GEOG_CORRECTION_FACTOR * DCM_Matrix[1][0];
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gps_pitch_D = (gps_err_pitch - gps_err_pitch_old) / GPS_Dt;
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gps_err_pitch_old = gps_err_pitch;
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gps_pitch_I += gps_err_pitch * GPS_Dt;
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gps_pitch_I = constrain(gps_pitch_I, -800, 800);
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command_gps_pitch = KP_GPS_PITCH * gps_err_pitch + KD_GPS_PITCH * gps_pitch_D + KI_GPS_PITCH * gps_pitch_I;
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command_gps_pitch = constrain(command_gps_pitch, -GPS_MAX_ANGLE, GPS_MAX_ANGLE); // Limit max command
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//Log_Write_PID(2,KP_GPS_PITCH*gps_err_pitch*10,KI_GPS_PITCH*gps_pitch_I*10,KD_GPS_PITCH*gps_pitch_D*10,command_gps_pitch*10);
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}
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void Reset_I_terms_navigation()
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{
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altitude_I = 0;
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gps_roll_I = 0;
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gps_pitch_I = 0;
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}
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