* R0 = Old (Start) CRC value
If R1 < 256 or R2=0
R1 = Byte to add
If R1 ³ &8000 and R2 > 0
R1 = Start address of buffer in memory
R2 = Length of buffer
* R0 = New CRC value
Re-entrant.
Calcuates 16-Bit CRCs compatible with the X/Y/Z-Modem polynominal (&8408)
Example
Note: ddUtil versions <0.31a checked for R1 > &8000 instead of R1 ³ &8000!
ddu_CRC16 Basic example
CRC=0
FOR A=0 TO 1023
SYS "ddu_CRC16",CRC,Buffer?A TO CRC
NEXT A
is equal to
SYS "ddu_CRC16",0,Buffer,1024 TO CRC
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