I2C bus

[Milosch Meriac]

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