CRC16 Qestions

Question 1:

How to use CRC16 module to calculate an data array's CRC result ?
In order to use TX8 module to send out the "data+crc" by H/W CRC.

Question 2:

code from cypress web --- S/W CRC16

unsigned short ComputeCrc(unsigned char *Buffer, unsigned char Length, unsigned char Seed)
{
   unsigned char Data;
   unsigned char Count = 0;
   // Load the CRC with an initial value.
   unsigned short Crc = (unsigned char)Seed;

   // loop through all bytes in the buffer
   while (Count < Length)
   {
       Data = Buffer[Count];

       // Update the CRC for transmitted and received data using
       // the CCITT 16-bit CRC algorithm (X^16 + X^12 + X^5 + 1).
       // The next 5 lines take 143 bytes
       Crc = (unsigned char)(Crc >> 😎 | (Crc << 8);
       Crc ^= Data;
       Crc ^= (unsigned char)(Crc & 0xff) >> 4;
       Crc ^= (Crc << 😎 << 4;
       Crc ^= ((Crc & 0xff) << 4) << 1;

       Count++;
   }
   return Crc;
}

if use Polynomial as (X^16 + X^15 + X^2 + 1) , how to change the code?

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