Crc

[grich]

Does any one have guide routine in PICBasic to calculate CRC16bit MODBUS ?

Thank,
Grich

[Kamikaze47]

A quick forum search found this:

http://www.picbasic.co.uk/forum/showthread.php?t=7646

[grich]

Thanks, and I found list below/
Is this routine right ?


Calcul_CRC16:

CRC16=$FFFF
For i=0 to (DataAmount -3)
CRC16=CRC16^DATACRC[i]
For j=1 to 8
IF CRC16.Bit0=1 Then
CRC16=$A001^(CRC16>>1)
Else
CRC16=CRC16>>1
EndIF
Next j
Next i
Return