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/*
* Copyright 2015 - 2016 Anton Tananaev (anton.tananaev@gmail.com)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.helper;
import org.traccar.model.Position;
import java.util.AbstractMap;
import java.util.Map;
public final class ObdDecoder {
private ObdDecoder() {
}
public static final int MODE_CURRENT = 0x01;
public static final int MODE_FREEZE_FRAME = 0x02;
public static final int MODE_CODES = 0x03;
private static final int PID_ENGINE_LOAD = 0x04;
private static final int PID_COOLANT_TEMPERATURE = 0x05;
private static final int PID_ENGINE_RPM = 0x0C;
private static final int PID_VEHICLE_SPEED = 0x0D;
private static final int PID_THROTTLE_POSITION = 0x11;
private static final int PID_MIL_DISTANCE = 0x21;
private static final int PID_FUEL_LEVEL = 0x2F;
private static final int PID_DISTANCE_CLEARED = 0x31;
public static Map.Entry<String, Object> decode(int mode, String value) {
switch (mode) {
case MODE_CURRENT:
case MODE_FREEZE_FRAME:
return decodeData(Integer.parseInt(value.substring(0, 2), 16), value.substring(2));
case MODE_CODES:
return decodeCodes(value);
default:
return null;
}
}
private static Map.Entry<String, Object> createEntry(String key, Object value) {
return new AbstractMap.SimpleEntry<>(key, value);
}
private static Map.Entry<String, Object> decodeCodes(String value) {
StringBuilder codes = new StringBuilder();
for (int i = 0; i < value.length() / 4; i++) {
int numValue = Integer.parseInt(value.substring(i * 4, (i + 1) * 4), 16);
codes.append(',');
switch (numValue >> 14) {
case 1:
codes.append('C');
break;
case 2:
codes.append('B');
break;
case 3:
codes.append('U');
break;
default:
codes.append('P');
break;
}
codes.append(String.format("%04X", numValue & 0x3FFF));
}
return createEntry("dtcs", codes.toString().replaceFirst(",", ""));
}
private static Map.Entry<String, Object> decodeData(int pid, String value) {
int intValue = Integer.parseInt(value, 16);
switch (pid) {
case PID_ENGINE_LOAD:
return createEntry("engineLoad", intValue * 100 / 255);
case PID_COOLANT_TEMPERATURE:
return createEntry("coolantTemperature", intValue - 40);
case PID_ENGINE_RPM:
return createEntry(Position.KEY_RPM, intValue / 4);
case PID_VEHICLE_SPEED:
return createEntry(Position.KEY_OBD_SPEED, intValue);
case PID_THROTTLE_POSITION:
return createEntry("throttle", intValue * 100 / 255);
case PID_MIL_DISTANCE:
return createEntry("milDistance", intValue);
case PID_FUEL_LEVEL:
return createEntry(Position.KEY_FUEL, intValue * 100 / 255);
case PID_DISTANCE_CLEARED:
return createEntry("clearedDistance", intValue);
default:
return null;
}
}
}
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