Re: GemPC Express Reader

Hi Martin, Hi Ludovic,

Am Mittwoch, den 18.02.2009, 17:47 +0100 schrieb Martin Preuss:
> On Mittwoch, 18. Februar 2009, Joachim Breitner wrote:
> [...]
> > The attached patch sets the protocol as specified from the ATR. I also
> > took the liberty to rename DriverIFD__ConnectSlot to
> > DriverIFD_ConnectSlot, as the repeated trial-and-error-calling of
> > DriverIFD__ConnectSlot seems to be no longer necessary.
> [...]
> 
> The trial-and-error method is still necessary because without that I can't 
> make the Kobil Kaan Advance connect a German medical card. So if you could 
> please revert that part of the patch I will insert it into Libchipcard.

At what call does it fail exactly? The call to
IFDHSetProtocolParameters, or somewhere else?

> The trial-and-error stuff is only used when a powerup of the card doesn't work 
> (like with German medical cards in the forementioned reader); in such a case 
> the protocol to be used can be determined by trying the given range of 
> protocols. 
> 
> This shouldn't affect your reader at all, because your new code would make the 
> powerup function work on the first attempt.

I can put it back in, but I wonder why it can not be detected in a
smarter manner?

Note that IFDHSetProtocolParameters will return
IFD_PROTOCOL_NOT_SUPPORTED for all parameters besides 1 (for T=0) and 2
(for T=1), so the only things to try would be:
 * No call to IFDHSetProtocolParameters.
 * Setting it to T=0
 * Setting it to T=1.

If anyone of you knows for sure that the first option will never work,
then there are only two options left to try.

I’m also wondering why the retrying in your current code only happens on
ConnectSlot, but not after a Reset – I’d expect it to be there necessary
as well...

Greetings,
Joachim

-- 
Joachim "nomeata" Breitner
  mail: [email protected] | ICQ# 74513189 | GPG-Key: 4743206C
  JID: [email protected] | http://www.joachim-breitner.de/
  Debian Developer: [email protected]

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