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PICList Thread
'Rolling code?'
1999\01\07@150018 by PJH

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Peter Hynes
PO Box 285, Burwood 3125, Victoria, AUSTRALIA
FAX: Int-613 9809 0604
EMAIL: spam_OUTelekTakeThisOuTspamnetstra.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.

1999\01\08@002324 by Tjaart van der Walt

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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.

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1999\01\08@051958 by Ian Rozowsky

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> > 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.
>
> --
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>                           \ /
> 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: .....rozKILLspamspam.....centsys.co.za

1999\01\08@134118 by tmariner

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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

1999\01\08@204709 by paulb

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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.

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