[Cryptech Tech] smart card interface for next hw rev

[Richard Lamb]

>From my rudimentary experience in writing smartcard driver/hw for some
atmel chips i found the usart must support iso7816 (half duplex so just one
pin) and the need for a gpio pin for rst and/or power control for the card
and a gpio for the card inserted switch on the carrier.  I also experienced
the need for a reasonable size capacitor to minimize the effects of
inserting/removing cards on any shared 3-5V PS line on the rest of my
circuitry.  FWIW, I used ACOS3 cards that have a easy to find spec for r/w
memory...but even simpler would be nice.  -Rick


On Tue, Jul 19, 2016 at 1:35 AM, Jakob Schlyter <jakob at kirei.se> wrote:

> In Berlin, we've been talking about how to use smart cards for
> reading/writing m-of-n components independent of the management host. The
> rough consensus was that plain memory smart cards as data carriers would be
> easy to use and present a reasonable interface to the ARM. Alternatives
> would be USB or punch cards, but seems to either add more attack surface or
> require ancient hardware.
>
> In order to be able to experiment more with this, we need two additional
> UARTs on the next hw rev board. One for connecting to a smart card reader
> (the rest of the required stuff is apparently already in the ARM) and one
> for a future LCD/keypad. As far as I understand, no other hardware (except
> for the actual reader/LCD/keypad) should be needed, and I hope Peter Stuge
> can confirm this.
>
>         jakob
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