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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.velbus.internal.packets;
  14
  15 import org.eclipse.jdt.annotation.NonNullByDefault;
  16 import org.openhab.binding.velbus.internal.VelbusChannelIdentifier;
  17
  18 /**
  19  * The {@link VelbusDimmerPacket} represents a Velbus packet that can be used to
  20  * dim a light to a given percentage.
  21  *
  22  * @author Cedric Boon - Initial contribution
  23  */
  24 @NonNullByDefault
  25 public class VelbusDimmerPacket extends VelbusPacket {
  26     private static final byte FIRST_GENERATION_DEVICE_FASTEST_DIMSPEED_HIGH_BYTE = (byte) 0xFF;
  27     private static final byte FIRST_GENERATION_DEVICE_FASTEST_DIMSPEED_LOW_BYTE = (byte) 0xFF;
  28
  29     private Boolean isFirstGenerationDevice;
  30     private byte command;
  31     private byte channel;
  32     private byte percentage;
  33     private int dimspeed;
  34
  35     public VelbusDimmerPacket(VelbusChannelIdentifier velbusChannelIdentifier, byte command, byte percentage,
  36             int dimspeed, Boolean isFirstGenerationDevice) {
  37         super(velbusChannelIdentifier.getAddress(), PRIO_HI);
  38
  39         this.channel = velbusChannelIdentifier.getChannelByte();
  40         this.command = command;
  41         this.percentage = percentage;
  42         this.dimspeed = dimspeed;
  43         this.isFirstGenerationDevice = isFirstGenerationDevice;
  44     }
  45
  46     @Override
  47     protected byte[] getDataBytes() {
  48         byte dimspeedHighByte = (byte) ((dimspeed & 0xFF00) / 0x100);
  49         byte dimspeedLowByte = (byte) (dimspeed & 0xFF);
  50
  51         if (dimspeed == 0 && isFirstGenerationDevice) {
  52             dimspeedHighByte = FIRST_GENERATION_DEVICE_FASTEST_DIMSPEED_HIGH_BYTE;
  53             dimspeedLowByte = FIRST_GENERATION_DEVICE_FASTEST_DIMSPEED_LOW_BYTE;
  54         }
  55
  56         return new byte[] { command, channel, percentage, dimspeedHighByte, dimspeedLowByte };
  57     }
  58 }