关于校验串口发送过来的针！的问题

EveryCase 2008-12-09 12:04:49

用的是hdlc协议！！
采用的CRC-CCITT=X16+X12+X5+1 进行校验的
利用的是反转多项式0x8404!!
byte[] crcbuff ={ 0x80, 0xc0, 0x40, 0x00, 0x90, 0x27, 0x08, 0x37, 0x40, 0x0f, 0x30, 0x4e, 0x4f };
最后2个字节是校验位！！
这个是串口数据！先低位后高位！
我想问的是。我校验的时候是按照我这个接受的顺序。还是说需要把他们反转一下！！
还有请高手帮我校验一下。看看我这个程序那里有问题。或者是我用的有错误的地方

我用的程序如下，

 public sealed class CRCCCITT

    {

        private static ushort[] CCITT_TABLE =   

        { 

                0x0000,   0x1189,   0x2312,   0x329B,   0x4624,   0x57AD,   0x6536,   0x74BF, 

                0x8C48,   0x9DC1,   0xAF5A,   0xBED3,   0xCA6C,   0xDBE5,   0xE97E,   0xF8F7, 

                0x1081,   0x0108,   0x3393,   0x221A,   0x56A5,   0x472C,   0x75B7,   0x643E, 

                0x9CC9,   0x8D40,   0xBFDB,   0xAE52,   0xDAED,   0xCB64,   0xF9FF,   0xE876, 

                0x2102,   0x308B,   0x0210,   0x1399,   0x6726,   0x76AF,   0x4434,   0x55BD, 

                0xAD4A,   0xBCC3,   0x8E58,   0x9FD1,   0xEB6E,   0xFAE7,   0xC87C,   0xD9F5, 

                0x3183,   0x200A,   0x1291,   0x0318,   0x77A7,   0x662E,   0x54B5,   0x453C, 

                0xBDCB,   0xAC42,   0x9ED9,   0x8F50,   0xFBEF,   0xEA66,   0xD8FD,   0xC974, 

                0x4204,   0x538D,   0x6116,   0x709F,   0x0420,   0x15A9,   0x2732,   0x36BB, 

                0xCE4C,   0xDFC5,   0xED5E,   0xFCD7,   0x8868,   0x99E1,   0xAB7A,   0xBAF3, 

                0x5285,   0x430C,   0x7197,   0x601E,   0x14A1,   0x0528,   0x37B3,   0x263A, 

                0xDECD,   0xCF44,   0xFDDF,   0xEC56,   0x98E9,   0x8960,   0xBBFB,   0xAA72, 

                0x6306,   0x728F,   0x4014,   0x519D,   0x2522,   0x34AB,   0x0630,   0x17B9, 

                0xEF4E,   0xFEC7,   0xCC5C,   0xDDD5,   0xA96A,   0xB8E3,   0x8A78,   0x9BF1, 

                0x7387,   0x620E,   0x5095,   0x411C,   0x35A3,   0x242A,   0x16B1,   0x0738, 

                0xFFCF,   0xEE46,   0xDCDD,   0xCD54,   0xB9EB,   0xA862,   0x9AF9,   0x8B70, 

                0x8408,   0x9581,   0xA71A,   0xB693,   0xC22C,   0xD3A5,   0xE13E,   0xF0B7, 

                0x0840,   0x19C9,   0x2B52,   0x3ADB,   0x4E64,   0x5FED,   0x6D76,   0x7CFF, 

                0x9489,   0x8500,   0xB79B,   0xA612,   0xD2AD,   0xC324,   0xF1BF,   0xE036, 

                0x18C1,   0x0948,   0x3BD3,   0x2A5A,   0x5EE5,   0x4F6C,   0x7DF7,   0x6C7E, 

                0xA50A,   0xB483,   0x8618,   0x9791,   0xE32E,   0xF2A7,   0xC03C,   0xD1B5, 

                0x2942,   0x38CB,   0x0A50,   0x1BD9,   0x6F66,   0x7EEF,   0x4C74,   0x5DFD, 

                0xB58B,   0xA402,   0x9699,   0x8710,   0xF3AF,   0xE226,   0xD0BD,   0xC134, 

                0x39C3,   0x284A,   0x1AD1,   0x0B58,   0x7FE7,   0x6E6E,   0x5CF5,   0x4D7C, 

                0xC60C,   0xD785,   0xE51E,   0xF497,   0x8028,   0x91A1,   0xA33A,   0xB2B3, 

                0x4A44,   0x5BCD,   0x6956,   0x78DF,   0x0C60,   0x1DE9,   0x2F72,   0x3EFB, 

                0xD68D,   0xC704,   0xF59F,   0xE416,   0x90A9,   0x8120,   0xB3BB,   0xA232, 

                0x5AC5,   0x4B4C,   0x79D7,   0x685E,   0x1CE1,   0x0D68,   0x3FF3,   0x2E7A, 

                0xE70E,   0xF687,   0xC41C,   0xD595,   0xA12A,   0xB0A3,   0x8238,   0x93B1, 

                0x6B46,   0x7ACF,   0x4854,   0x59DD,   0x2D62,   0x3CEB,   0x0E70,   0x1FF9, 

                0xF78F,   0xE606,   0xD49D,   0xC514,   0xB1AB,   0xA022,   0x92B9,   0x8330, 

                0x7BC7,   0x6A4E,   0x58D5,   0x495C,   0x3DE3,   0x2C6A,   0x1EF1,   0x0F78 

        };

        public static ushort CRC(byte[] ABytes)

        {

            ushort Result = 0;

            foreach (byte vByte in ABytes)

                Result = (ushort)(CCITT_TABLE[(Result ^ vByte) & 0xff] ^ (Result >> 8));

            return (ushort)(Result);

        }

    }