RCR Verification Code

In serial programming, you must use the RCR verification code to determine whether the received data is correct. The following is the Baidu RCR verification code, which is tested correctly.

 1 private void CalculateCRC(byte[] pByte, int nNumberOfBytes, out byte hi, out byte lo) 2         { 3             ushort sum; 4             CalculateCRC(pByte, nNumberOfBytes, out sum); 5             lo = (byte)(sum & 0xFF); 6             hi = (byte)((sum & 0xFF00) >> 8); 7         } 8  9         private void CalculateCRC(byte[] pByte, int nNumberOfBytes, out ushort pChecksum)10         {11             int nBit;12             ushort nShiftedBit;13             pChecksum = 0xFFFF;14 15             for (int nByte = 0; nByte < nNumberOfBytes; nByte++)16             {17                 pChecksum ^= pByte[nByte];18                 for (nBit = 0; nBit < 8; nBit++)19                 {20                     if ((pChecksum & 0x1) == 1)21                     {22                         nShiftedBit = 1;23                     }24                     else25                     {26                         nShiftedBit = 0;27                     }28                     pChecksum >>= 1;29                     if (nShiftedBit != 0)30                     {31                         pChecksum ^= 0xA001;32                     }33                 }34             }35         }

 

RCR Verification Code