Post by thread:Rolling code?

Peter Hynes PO Box 285, Burwood 3125, Victoria, AUSTRALIA FAX: Int-613 9809 0604 EMAIL: spam_OUTelekTakeThisOuTnetstra.com.au ---------- Hi, Now I seem to have got my computer to behave itself, I'm tempted to ask another question. National App Notes 960 & 961 describe how to programme their Hi-Sec _rolling code generator_ using the COP888CG. There's a schematic + code and it should be reasonably straightforward to adapt it in order to make a PIC Hi-Sec programmer from the info NC provides. BUT, since this has no doubt already been done, would anyone know where some pointers might be found re PICs used to programme the Hi-Sec device? Come to think of it, would there be any real showstoppers in trying to implement a rolling code generator entirely in software using a PIC? Regards - PJH.

PJH wrote: > BUT, since this has no doubt already been done, would anyone know > where some pointers might be found re PICs used to programme the > Hi-Sec device? > > Come to think of it, would there be any real showstoppers in trying > to implement a rolling code generator entirely in software using a PIC? > > Regards - PJH. What did you think the Keeloq chips were? They are nothing more than PICs with masked ROMs. If you sign the NDA with Mchip (as a developer) you get all the info. -- Friendly Regards /"\ \ / Tjaart van der Walt X ASCII RIBBON CAMPAIGN .....tjaartKILLspam@spam@wasp.co.za / \ AGAINST HTML MAIL |--------------------------------------------------| | WASP International | |R&D Engineer : GSM peripheral services development| |--------------------------------------------------| | Mobile : tjaartKILLspamsms.wasp.co.za (160 text chars) | | http://www.wasp.co.za/~tjaart/index.html | |Voice: +27-(0)11-622-8686 Fax: +27-(0)11-622-8973| | WGS-84 : 26¡10.52'S 28¡06.19'E | |--------------------------------------------------|

> > Come to think of it, would there be any real showstoppers in trying > > to implement a rolling code generator entirely in software using a PIC? > > > > Regards - PJH. > > What did you think the Keeloq chips were? They are nothing > more than PICs with masked ROMs. If you sign the NDA with > Mchip (as a developer) you get all the info. > > -- > Friendly Regards /"\ > \ / > Tjaart van der Walt X ASCII RIBBON CAMPAIGN Keeloq's encryption is not technically rolling code, but rather code hopping. The rolling code algorithms supposedly originated in the US, whereas code hopping was developed in S.A. Just for the record Ian Rozowsky Development Engineer Centurion Systems Box 506 Cramerview 2060 South Africa Tel : +27-11-708-2680 Fax : +27-11-708-2630 e-mail: .....rozKILLspam.....centsys.co.za

Hello Peter, > Come to think of it, would there be any real showstoppers in trying > to implement a rolling code generator entirely in software > using a PIC? I would consider a lawsuit from Microchip to be a showstopper. They bought the patents and technology for the Keyloq technology and have been developing on that base. They have brought suit against one of our customers, a large manufacturer of remote control modules for making a "rolling code" device. (We had nothing to do with the offending product.) Unfortunately for us, the customer promptly designed the Pic out of our product in favor of a competing 8 bit device, leaving us one customer less. Tom

tmariner wrote: > Unfortunately for us, the customer promptly designed the Pic out of > our product in favor of a competing 8 bit device, leaving us one > customer less. And so they should have! MC didn't *want* the sales, obviously! -- Cheers, Paul B.