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   1 /**
   2  * Copyright (c) 2010-2022 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 /**
  16  * The {@link CommandFactory} is responsible for creating different commands that can
  17  * be send to a rego 6xx unit.
  18  *
  19  * @author Boris Krivonog - Initial contribution
  20  */
  21 public class CommandFactory {
  22     private static final byte DEVICE_ADDRESS = (byte) 0x81;
  23
  24     public static byte[] createReadRegoVersionCommand() {
  25         return createReadCommand((byte) 0x7f, (short) 0);
  26     }
  27
  28     public static byte[] createReadFromSystemRegisterCommand(short address) {
  29         return createReadCommand((byte) 0x02, address);
  30     }
  31
  32     public static byte[] createWriteToSystemRegisterCommand(short address, short data) {
  33         return createCommand((byte) 0x03, address, data);
  34     }
  35
  36     public static byte[] createReadFromDisplayCommand(short displayLine) {
  37         return createReadCommand((byte) 0x20, displayLine);
  38     }
  39
  40     public static byte[] createReadLastErrorCommand() {
  41         return createReadCommand((byte) 0x40, (short) 0);
  42     }
  43
  44     public static byte[] createReadFromFrontPanelCommand(short address) {
  45         return createReadCommand((byte) 0x00, address);
  46     }
  47
  48     private static byte[] createReadCommand(byte source, short address) {
  49         return createCommand(source, address, (short) 0);
  50     }
  51
  52     private static byte[] createCommand(byte source, short address, short data) {
  53         byte[] addressBytes = ValueConverter.shortToSevenBitFormat(address);
  54         byte[] dataBytes = ValueConverter.shortToSevenBitFormat(data);
  55         return new byte[] { DEVICE_ADDRESS, source, addressBytes[0], addressBytes[1], addressBytes[2], dataBytes[0],
  56                 dataBytes[1], dataBytes[2], Checksum.calculate(addressBytes, dataBytes) };
  57     }
  58 }