Post by thread:Parity Calculation

Hi all I need to calculate odd Parity on a Packet of the following Packet = 6 words, the 6th is the parity byte. We will take BITn from each WORD then calculate odd parity. Ive almost completed a working version of code but im sure im doing it a long winded way. Are there any nice PARITY routines out there. thanks %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Anthony Buckwell E-Mail: spam_OUTa.buckwellTakeThisOuTcat.csiro.au Electronic Engineer Exploration and Mining, QCAT CSIRO Australia 2643 Moggill Road, Pinjarra Hills QLD 4069 PO Box 883 Kenmore QLD , 4069 Australia PH: +61 7 3212 4769 Mobile 0419 783 109 FAX:+61 7 3212 4455 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Hi, Try: movf byte1,w xorwf byte2,w xorwf byte3,w xorwf byte4,w xorwf byte5,w movwf byte6 ;store parity Reggie Anthony Buckwell wrote: {Quote hidden}> > Hi all > > I need to calculate odd Parity on a Packet of the following > > Packet = 6 words, the 6th is the parity byte. > > We will take BITn from each WORD then calculate odd parity. > > Ive almost completed a working version of code but im sure im doing it a > long winded way. > > Are there any nice PARITY routines out there.

At 07:34 01/20/99 +0800, Regulus Berdin wrote: >Try: > movf byte1,w > xorwf byte2,w > xorwf byte3,w > xorwf byte4,w > xorwf byte5,w > movwf byte6 ;store parity > >Reggie > > >Anthony Buckwell wrote: >> >> I need to calculate odd Parity on a Packet of the following >> >> Packet = 6 words, the 6th is the parity byte. >> >> We will take BITn from each WORD then calculate odd parity. isn't that even parity? load w with 0xff before you start xoring (or xor it with 0xff afterwards) to get it odd. ge