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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.regoheatpump.internal.rego6xx;
  14
  15 import org.eclipse.jdt.annotation.NonNullByDefault;
  16
  17 /**
  18  * The {@link CommandFactory} is responsible for creating different commands that can
  19  * be send to a rego 6xx unit.
  20  *
  21  * @author Boris Krivonog - Initial contribution
  22  */
  23 @NonNullByDefault
  24 public class CommandFactory {
  25     private static final byte DEVICE_ADDRESS = (byte) 0x81;
  26
  27     public static byte[] createReadRegoVersionCommand() {
  28         return createReadCommand((byte) 0x7f, (short) 0);
  29     }
  30
  31     public static byte[] createReadFromSystemRegisterCommand(short address) {
  32         return createReadCommand((byte) 0x02, address);
  33     }
  34
  35     public static byte[] createWriteToSystemRegisterCommand(short address, short data) {
  36         return createCommand((byte) 0x03, address, data);
  37     }
  38
  39     public static byte[] createReadFromDisplayCommand(short displayLine) {
  40         return createReadCommand((byte) 0x20, displayLine);
  41     }
  42
  43     public static byte[] createReadLastErrorCommand() {
  44         return createReadCommand((byte) 0x40, (short) 0);
  45     }
  46
  47     public static byte[] createReadFromFrontPanelCommand(short address) {
  48         return createReadCommand((byte) 0x00, address);
  49     }
  50
  51     private static byte[] createReadCommand(byte source, short address) {
  52         return createCommand(source, address, (short) 0);
  53     }
  54
  55     private static byte[] createCommand(byte source, short address, short data) {
  56         byte[] addressBytes = ValueConverter.shortToSevenBitFormat(address);
  57         byte[] dataBytes = ValueConverter.shortToSevenBitFormat(data);
  58         return new byte[] { DEVICE_ADDRESS, source, addressBytes[0], addressBytes[1], addressBytes[2], dataBytes[0],
  59                 dataBytes[1], dataBytes[2], Checksum.calculate(addressBytes, dataBytes) };
  60     }
  61 }