2021-09-17 串口通讯协议拼接

动态区 拼接数据示例

a5 a5 a5 a5 a5 a5 a5 a5 02 00 00 80 00 00 00 00 00 01 51 02 2a 00 a3 06 01 00 00 00 01 21 00 06 00 00 00 00 08 00 20 00 00 00 00 02 00 00 00 00 01 01 01 00 00 0a 06 00 00 00 48 65 6c 6c 6f 21 60 33 5a

数据解析

帧头
a5 a5 a5 a5 a5 a5 a5 a5 

包头数据
02 00 //DstAddr   屏号2
00 80 //SrcAddr   客户端
00 00 00 00 //Reserved
00 //CheckMode   
01 //DisplayMode
51 //DeviceType    5K1
02 //ProtocoIVersion
2a 00 //DataLen

数据域(实时信息)
a3 //CmdGroup
06 //Cmd
01 //Response
00 //ProcessMode
00 //Reserved
00 //DeleteAreaNum  DeleteAreaId不发送
01 //AreaNum
21 00 //AreaDataLen0
06 //AreaType   动态区类型在6以上
00 00 //AreaX   0
00 00 //AreaY   0
08 00 //AreaWidth   64
20 00 //AreaHeight   32
00 //DynamicAreaLoc   0
00 //Lines_sizes
00 //Runmode
02 00 //Timeout
00 //SoundMode   SoundPerson\SoundVolume\SoundSpeed\SoundDataLen\SoundData不发送
00 00 //Reserved
01 //SingleLine  单行
01 //NewLine   手动换行
01 //DisplayMode  静止
00 //ExitMode
00 //Speed
0a //StayTime
06 00 00 00 //DataLen
48 65 6c 6c 6f 21 //Data   Hello!

包校验
60 33 

拼接代码

  private void test(){
        //头部
        final byte[] HEAD_LED =  new byte[]{(byte) 0xA5, (byte) 0xA5,(byte) 0xA5,(byte) 0xA5,(byte) 0xA5,(byte) 0xA5,(byte) 0xA5,(byte) 0xA5};
        //尾部
        final byte[] END_LED =  new byte[]{(byte) 0x5A};

        String text = "Hello!";
        byte[] textBuffer = text.getBytes(StandardCharsets.UTF_8);
        int textBufferLength = textBuffer.length;

        int areaX = 0;
        int areaY = 0;
        int areaWidth = 64;
        int areaHeight = 32;
        int timeout = 2;

        int screenNumber = 2;
        int srcAddress = 0X8000;

        //1.区域数据
        ByteBuffer areaBuffer = ByteBuffer.allocate(512);
        areaBuffer.put((byte)0X06);//AreaType
        areaBuffer.put((byte)(areaX & 0XFF));//x
        areaBuffer.put((byte)((areaX >>> 8)&0XFF));
        areaBuffer.put((byte)(areaY & 0XFF));//y
        areaBuffer.put((byte)((areaY >>> 8)&0XFF));
        areaBuffer.put((byte)(areaWidth & 0XFF));//areaWidth
        areaBuffer.put((byte)((areaWidth >>> 8)&0XFF));
        areaBuffer.put((byte)(areaHeight & 0XFF));//areaHeight
        areaBuffer.put((byte)((areaHeight >>> 8)&0XFF));
        areaBuffer.put((byte)0X00);
        areaBuffer.put((byte)0X00);
        areaBuffer.put((byte)0X00);
        areaBuffer.put((byte)(timeout & 0XFF));//timeout
        areaBuffer.put((byte)((timeout >>> 8)&0XFF));
        areaBuffer.put((byte)0X00);
        areaBuffer.putShort((short)0X00);
        areaBuffer.put((byte)0X01);//SingleLine  单行
        areaBuffer.put((byte)0X01);//NewLine   手动换行
        areaBuffer.put((byte)0X01);//DisplayMode  静止
        areaBuffer.put((byte)0X00);//ExitMode
        areaBuffer.put((byte)0X00);//Speed
        areaBuffer.put((byte)0X0A);//StayTime
        areaBuffer.put((byte)(textBufferLength & 0XFF));//DataLength
        areaBuffer.put((byte)((textBufferLength >> 8)&0XFF));
        areaBuffer.put((byte)((textBufferLength >> 16)&0XFF));
        areaBuffer.put((byte)((textBufferLength >> 24)&0XFF));
        areaBuffer.put(textBuffer);//data

        areaBuffer.flip();
        int areaBufferLength = areaBuffer.limit();
        byte[] areaBufferData = new byte[areaBufferLength];
        areaBuffer.get(areaBufferData);

        //2.数据域
        ByteBuffer dataBuffer = ByteBuffer.allocate(1024);
        dataBuffer.put((byte)0XA3);//cmdGroup
        dataBuffer.put((byte)0X06);
        dataBuffer.put((byte)0X01);
        dataBuffer.put((byte)0X00);
        dataBuffer.put((byte)0X00);
        dataBuffer.put((byte)0X00);
        dataBuffer.put((byte)0X01);//alarmNum
        dataBuffer.put((byte)(areaBufferLength & 0XFF));//length
        dataBuffer.put((byte)((areaBufferLength >> 8)&0XFF));
        dataBuffer.put(areaBufferData);

        dataBuffer.flip();
        int dataBufferLength = dataBuffer.limit();
        byte[] dataBufferData = new byte[dataBufferLength];
        dataBuffer.get(dataBufferData);

        //3.包头数据
        ByteBuffer headBuffer = ByteBuffer.allocate(14);
        headBuffer.put((byte)(screenNumber & 0XFF));//dstAddress
        headBuffer.put((byte)((screenNumber >> 8)&0XFF));
        headBuffer.put((byte)(srcAddress & 0XFF));//srcAddress
        headBuffer.put((byte)((srcAddress >> 8)&0XFF));
        headBuffer.put((byte)0X00);
        headBuffer.put((byte)0X00);
        headBuffer.put((byte)0X00);
        headBuffer.put((byte)0X00);//Option
        headBuffer.put((byte)0X02);//CheckMode 无需校验 注意这里？
        headBuffer.put((byte)0X01);//DisplayMode
        headBuffer.put((byte)0X51);//DeviceType
        headBuffer.put((byte)0X02); //ProtocolVersion
        headBuffer.put((byte)(dataBufferLength & 0XFF));//DataLen
        headBuffer.put((byte)((dataBufferLength >> 8)&0XFF));

        headBuffer.flip();
        int headBufferLength = headBuffer.limit();
        byte[] headBufferData = new byte[headBufferLength];
        headBuffer.get(headBufferData);

        //4.校验位
        short bufferCheck = 0;

        ByteBuffer.allocate(dataBufferLength & 0XFF).order(ByteOrder.LITTLE_ENDIAN);

        //5.完整包
        ByteBuffer buffer = ByteBuffer.allocate(2048);
        buffer.put(HEAD_LED);
        buffer.put(headBufferData);
        buffer.put(dataBufferData);

        buffer.putShort(bufferCheck);//这里要与CheckMode的值对应上 =2，不需要校验
        buffer.put(END_LED);


        buffer.flip();
        LogUtils.e(bytes2hex(conver(buffer))+"-----------------------");
    }

    //必须调用完后flip()才可以调用此方法
    public static byte[] conver(ByteBuffer byteBuffer){
        int len = byteBuffer.limit() - byteBuffer.position();
        byte[] bytes = new byte[len];

        if(byteBuffer.isReadOnly()){
            return null;
        }else {
            byteBuffer.get(bytes);
        }
        return bytes;
    }

    public static String bytes2hex(byte[] bytes) {
        StringBuilder sb = new StringBuilder();
        String tmp = null;
        for (byte b : bytes) {
            // 将每个字节与0xFF进行与运算，然后转化为10进制，然后借助于Integer再转化为16进制
            tmp = Integer.toHexString(0xFF & b);
            if (tmp.length() == 1) {
                tmp = "0" + tmp;
            }
            sb.append(tmp);
        }
        return sb.toString();
    }