mifare_desfire_connect hangs when used after nfc_initiator_poll_target

[tomfrancart]

I'm attempting to use nfc_initiator_poll_target to poll for a card, and then connect using the libfreefare function corresponding to the card type.

The following works fine for mifare_classic:

nfc_initiator_poll_target(..., candidate)
tag = freefare_tag_new(candidate)
mifare_classic_connect(tag)
mifare_classic_authenticate(tag)
mifare_classic_read(tag)

If I attempt the same for desfire, the call to mifare_desfire_connect hangs until I remove and replace the desfire card:

nfc_initiator_poll_target(..., candidate)
tag = freefare_tag_new(candidate)
mifare_desfire_connect(tag)    // hangs here

It actually hangs on line 298 in mifare_desfire.c:

if (nfc_initiator_select_passive_target (tag->device, modulation, tag->info.nti.nai.abtUid, tag->info.nti.nai.szUidLen, &pnti) >= 0) {

I tried setting all parameters in this call to the same ones as used for mifare_classic, but to no avail.

I made an example by editing examples/nfc-poll.c from libnfc, add the following after line 153:

printf("Attempting desfire_connect..\n");
FreefareTag tag = freefare_tag_new(pnd, nt);
if (!tag) {
    printf("freefare_tag_new failed");
}
res = mifare_desfire_connect(tag);
printf("Desfire_connect done.\n");

If you place a mifare classic card on the reader, the program will immediately continue until after printf("Desfire_connect done.\n")
If you place a desfire card on the reader, it will hang, and only continue after removing the card and replacing it.

What does work is the following:

nfc_initiator_poll_target(...)     // ignore result
tags = freefare_get_tags (device);
mifare_desfire_connect (tags[0]);
mifare_desfire_select_application
mifare_desfire_authenticate
mifare_desfire_read_data

But this is quite inefficient.

best regards,
Tom

PS: I originally reported this on the forum: http://forums.nfc-tools.org/post/5717/#p5717