: "/*************************************************************************
* Example Table Driven CRC16 Routine using 4-bit message chunks
*
* By Ashley Roll
* Digital Nemesis Pty Ltd
* www.digitalnemesis.com
*
* The following is an example of implementing a restricted size CRC16
* table lookup. No optimisation as been done so the code is clear and
* easy to understand.
*
* Test Vector: '123456789' (character string, no quotes)
* Generated CRC: 0x29B1
*
*************************************************************************/

/*
* CRC16 Lookup tables (High and Low Byte) for 4 bits per iteration.
*/
unsigned short CRC16_LookupHigh[16] = {
0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1
};
unsigned short CRC16_LookupLow[16] = {
0x00, 0x21, 0x42, 0x63, 0x84, 0xA5, 0xC6, 0xE7,
0x08, 0x29, 0x4A, 0x6B, 0x8C, 0xAD, 0xCE, 0xEF
};

/*
* CRC16 'Register'. This is implemented as two 8bit values
*/
unsigned char CRC16_High, CRC16_Low;

/*
* Before each message CRC is generated, the CRC register must be
* initialised by calling this function
*/
void CRC16_Init( void )
{
// Initia"