I2C bus

[Kn1ght L0rd]

Thanks Milosch!  Only one last unaddressed question.  What about powering
the units without using USB?  Any thoughts?

On 7/21/07, Milosch Meriac <meriac at bitmanufaktur.de> wrote:
>
> Kn1ght L0rd work:
> > Is the same flash functionality enabled in the openPICC?  So I could
> > pass the read data to the openPICC and it would store the data in it's
> > flash?  Where is that code for the flash memory?
>
> Have a look at my OpenBeacon USB firmware. Just make sure the you
> reserver the amount of flash needed on top of the flash inside the
> linker file (.ld).
>
> >     > The scenario being you walk by someone with a RFID card of some
> >     type and
> >     > as you walk by you read the card and the PCD passes that
> >     information to
> >     > the PICC in which it broadcasts that data so you have essentially
> >     cloned
> >     > the card without any transaction taking place other than the
> PCD/card
> >
> >     I suggest you to use the serial debug interface for interdevice
> >     communication and to use the I2C for your display.
> >
> >
> > I will follow your advice on this.  Is there any displays you recommend
> > that are easy to implement?
>
> Just pick any display with I2C - there are only few anyway (digikey.com).
>
> > And I am assuming all these devices are mapped to the CPU correct?  I
> > will start looking at that firmware this weekend and seeing what I can
> > come up with.
>
> Yep - see main_reqa.
>
> > Great, that will help me weed out stuff that isn't that important at
> > this point.  My other question is how would you suggest we power the
> > unit(s) if we are going to do it standalone?  And there is still the
> > issue of an antenna, what is the difference between a normal antenna and
> > an RC632 compatible antenna?  Once again thanks for all your help.
>
> AFAIK there are no normal antennas. For 13.56 MHz you need magnetical
> loop antennas. The electrical component of the field is none of our
> business. I used a Hula Hoop as a high gain magnetical loop antenna (see
> my first CCC talk):
>
> http://www.openpcd.org/rfiddump.0.html
> http://www.openpcd.org/dl/22C3/rfid-22C3.pdf
>
> Warmest regards,
>
> Milosch
> --
> Bitmanufaktur :: Schwedter Strasse 23 :: 10119 Berlin
> Fon +49 (0)30 4172 5006 :: Fax +49 (0)30 4172 5054
> meriac at bitmanufaktur.de :: http://bitmanufaktur.de
>
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