| | |
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| | | * @return CRC |
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| | | */ |
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| | | @SuppressWarnings("unused") |
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| | | public short CRC16_table(byte[] bs, int startIndex, int endIndex) { |
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| | | short x ; |
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| | | short crc = (short)0xffff; |
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| | | public int CRC16_table(byte[] bs, int startIndex, int endIndex) { |
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| | | int x ; |
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| | | int crc = 0xffff; |
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| | | if(bs != null && bs.length >= endIndex + 1){ |
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| | | for (int i = startIndex ; i <= endIndex; i++){ |
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| | | x = (short)(crc ^ bs[i]) ; |
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| | | crc = (short)((crc >> 8) ^ crc16_rev_table[x & 0x00FF]) ; |
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| | | x = (crc ^ bs[i]) ; |
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| | | crc = ((crc >> 8) ^ crc16_rev_table[x & 0x00FF]) ; |
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| | | } |
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| | | } |
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| | | return crc ; |
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| | |
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| | | } |
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| | | |
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| | | public static void main(String[] args) throws Exception { |
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| | | //String hex = "AA0024AA |
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| | | // 16015301 |
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| | | // 15059980 |
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| | | // 00011000 |
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| | | // 00014A00 |
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| | | // 5D4D5D4D |
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| | | // 00004000 |
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| | | // AAC616" ; |
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| | | int s = 62430 ; |
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| | | //String hex = "AA0018AA16015301150599800001100000014A005D4D5D4D00004000AA7E16" ; |
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| | | String hex = "AA0018AA16015301150599800001100000014A005D4D5D4D00004000" ; |
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| | | byte[] bs = ByteUtil.hex2Bytes(hex) ; |
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| | | for(int i = 0 ; i < bs.length - 2 ; i++){ |
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| | | short crc = new CRC16().CRC16_table(bs, i , bs.length - 1) ; |
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| | | byte[] bytes = new byte[ProtocolConstantV206V1.UG_lenTail] ; |
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| | | ByteUtil.short2Bytes_LE(bytes, crc, 0); |
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| | | bytes[2] = ProtocolConstantV206V1.P_Tail_Byte ; |
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| | | System.out.println(ByteUtil.bytes2Hex(bytes, true)) ; |
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| | | } |
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| | | // System.out.println("==============================") ; |
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| | | // for(int i = 4 ; i < bs.length ; i++){ |
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| | | // short crc = new CRC16().CRC16_table(bs, 0 , i) ; |
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| | | // byte[] bytes = new byte[ProtocolConstantV206V1.UG_lenTail] ; |
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| | | // ByteUtil.short2Bytes_LE(bytes, crc, 0); |
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| | | // bytes[2] = ProtocolConstantV206V1.P_Tail_Byte ; |
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| | | // System.out.println(ByteUtil.bytes2Hex(bytes, true)) ; |
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| | | // } |
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| | | int crc = new CRC16().CRC16_table(bs, 0 , bs.length - 1) ; |
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| | | byte[] crcBs = new byte[4] ; |
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| | | ByteUtil.int2Bytes_BE(crcBs, crc, 0); |
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| | | System.out.println(ByteUtil.bytes2Hex(crcBs, true)) ; |
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| | | } |
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| | | |
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| | | } |
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