[Pcsclite-muscle] Slot Status Error Code

[Ludovic Rousseau]

Le mer. 14 juil. 2021 à 18:07, Harald Glanzer
<harald.glanzer at rise-world.com> a écrit :
>
> Hello,

Hello Harald,

> i am working on a cardreader-firmware; the application using the
> cardreader requires to know if 2 or more iso14443 (nfc) cards are
> detected by the (single) nfc 'slot'.
>
> i can detect the presence of multiple cards via cardreader-fw, but i
> have no idea what is the best way to signal this information to the
> application using the pcsc - API.
>
> - setting the cardreader status to 'mute' is maybe not the best way as i
> think this state may also occur in other situations.
>
> - CCID 6.2.6 / 'Reporting Slot Error and Slot Status' reserves
> errorrange 0x81 - 0xC0 for user defined purposes, but i am wondering if
> there is any possibility to obtain this error code by pcsc api.
>
> running pcscd in debug mode (pcscd -d -f) shows my user defined error
> code 0xC0:
> ------------------ 8< ------------------
> ...
> "16333662 [140246702278400] commands.c:1235:CmdGetSlotStatus Unknown
> CCID error: 0xC0"
> ...
> ------------------ 8< ------------------
>
> is there any way to check for this status, for example via
> 'ScardGetStatusChange()'?
>
> or otherwise, could somebody point me into the right direction?

If you want your reader to be able to report 0, 1 or 2 cards then you
need to use 2 CCID slots.
I do not see any other clean way.

Regards,

-- 
 Dr. Ludovic Rousseau