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Basic Stamp 633 CRC example

cbell

New member
Does anyone have an example of calculating the CRC for a 633 with a basic stamp. I have gotten this to work in C#, but the basic stamp is a whole other beast and I thought if someone had accomplished this it would prevent me from reinventing the wheel.
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Joe

New member
Thanks for everybody's help, I found the answer to CRC-16 code for the BS2 and PIC's. Here it is... Test it against this sites calculator CRC Calculator
Code:
CRC VAR Word 
Calc VAR Word 
aByte VAR Byte 
Counter VAR Nib 

POLYNOMIAL CON $8408

Main: 
CRC = $0000 
aByte = "1": GOSUB Calc_Crc 
aByte = "2": GOSUB Calc_Crc 
aByte = "3": GOSUB Calc_Crc 
aByte = "4": GOSUB Calc_Crc 
aByte = "5": GOSUB Calc_Crc 
aByte = "6": GOSUB Calc_Crc 
aByte = "7": GOSUB Calc_Crc 
aByte = "8": GOSUB Calc_Crc 
aByte = "9": GOSUB Calc_Crc 
DEBUG HEX crc 
END 

Calc_Crc: 
FOR Counter = 0 TO 7 
Calc = aByte ^ CRC & 1 
IF Calc = 0 THEN CRC_Add 
Calc = POLYNOMIAL 
CRC_Add: 
CRC = CRC / 2 ^ Calc 
aByte = aByte / 2 
NEXT 
RETURN
 
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