Hello
I'm using Darrel's CRC routine to calculate a CRC but the results are not as expected.
Here is Darrel's routine -
The eight bytes I'm using are "F2 AA 4C D4 60 F6 00 80"
The result I get is B2D5 rather than E23E as it should be.
Using an online calculator I get the same result, but if I tick the box "bit reflected", I get the correct result.
I'm sure I'm missing something really simple but I have tried many things without success.
Any Ideas?
I'm using Darrel's CRC routine to calculate a CRC but the results are not as expected.
Here is Darrel's routine -
Code:
CRC VAR WORD
CRC_IN VAR BYTE
Idx VAR BYTE
CRC_Len CON 16
CRC_Poly CON $1021 ; x16 + x12 + x5 + 1
;-----CRC-16 -----------------------------------------------------
CRC16:
CRC.HighByte = CRC.HighByte ^ CRC_IN
FOR Idx = 0 to 7
IF CRC.0(CRC_Len-1) THEN
CRC = (CRC << 1) ^ CRC_Poly
ELSE
CRC = CRC << 1
ENDIF
NEXT Idx
RETURNThe result I get is B2D5 rather than E23E as it should be.
Using an online calculator I get the same result, but if I tick the box "bit reflected", I get the correct result.
I'm sure I'm missing something really simple but I have tried many things without success.
Any Ideas?