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Cleanup up nfc_initiator_list_passive_targets(): remove attempts to retrieve ATQA when collision occurs, after a lot of tests by Romain and me we are not able to find a way to retrieve all tags ATQA if different card types are on the nfc device.

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This commit is contained in:
Romuald Conty 2010-08-17 10:08:38 +00:00
parent 3c57861d6b
commit 476c05cfb4
1 changed files with 0 additions and 53 deletions
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53
libnfc/nfc.c
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@ -523,8 +523,6 @@ nfc_initiator_select_passive_target(const nfc_device_t* pnd,
bool nfc_initiator_list_passive_targets(nfc_device_t* pnd, const nfc_modulation_t nmInitModulation, nfc_target_info_t anti[], const size_t szTargets, size_t *pszTargetFound )
{
nfc_target_info_t nti;
bool bCollisionDetected = false;
size_t szTargetFound = 0;
// Let the reader only try once to find a target
@ -533,12 +531,6 @@ bool nfc_initiator_list_passive_targets(nfc_device_t* pnd, const nfc_modulation_
while (nfc_initiator_select_passive_target (pnd, nmInitModulation, NULL, 0, &nti)) {
nfc_initiator_deselect_target(pnd);
if(nmInitModulation == NM_ISO14443A_106) {
if((nti.nai.abtAtqa[0] == 0x00) && (nti.nai.abtAtqa[1] == 0x00)) {
bCollisionDetected = true;
}
}
if(szTargets > szTargetFound) {
memcpy( &(anti[szTargetFound]), &nti, sizeof(nfc_target_info_t) );
}
@ -546,51 +538,6 @@ bool nfc_initiator_list_passive_targets(nfc_device_t* pnd, const nfc_modulation_
}
*pszTargetFound = szTargetFound;
DBG("%zu targets was found%s.", *pszTargetFound, bCollisionDetected?" (with SENS_RES collision)":"");
/*
// TODO This chunk of code attempt to retrieve SENS_RES (ATQA) for ISO14443A which collide previously.
// XXX Unfortunately at this stage, I'm not able to REQA each tag correctly to retrieve this SENS_REQ.
// Drop the field for a while
nfc_configure(pnd,NDO_ACTIVATE_FIELD,false);
// Let the reader only try once to find a tag
nfc_configure(pnd,NDO_INFINITE_SELECT,false);
// Configure the CRC and Parity settings
nfc_configure(pnd,NDO_HANDLE_CRC,true);
nfc_configure(pnd,NDO_HANDLE_PARITY,true);
// Enable field so more power consuming cards can power themselves up
nfc_configure(pnd,NDO_ACTIVATE_FIELD,true);
if(bCollisionDetected && (nmInitModulation == NM_ISO14443A_106)) {
// nfc_initiator_select_passive_target(pnd, NM_ISO14443A_106, anti[0].nai.abtUid, anti[0].nai.szUidLen, NULL);
for( size_t n = 0; n < szTargetFound; n++ ) {
size_t szTargetsData;
byte_t abtTargetsData[MAX_FRAME_LEN];
if(!pn53x_InListPassiveTarget(pnd, NM_ISO14443A_106, 2, NULL, 0, abtTargetsData, &szTargetsData)) return false;
DBG("pn53x_InListPassiveTarget(): %d selected target(s)", abtTargetsData[0]);
if(szTargetsData && (abtTargetsData[0] > 0)) {
byte_t* pbtTargetData = abtTargetsData+1;
size_t szTargetData = 5 + *(pbtTargetData + 4); // Tg, SENS_RES (2), SEL_RES, NFCIDLength, NFCID1 (NFCIDLength)
if( (*(pbtTargetData + 3) & 0x40) && ((~(*(pbtTargetData + 3))) & 0x04) ) { // Check if SAK looks like 0bxx1xx0xx, which means compliant with ISO/IEC 14443-4 (= ATS available) (See ISO14443-3 document)
szTargetData += 1 + *(pbtTargetData + szTargetData); // Add ATS length
}
if(!pn53x_decode_target_data(pbtTargetData, szTargetData, pnd->nc, NTT_GENERIC_PASSIVE_106, &nti)) return false;
#ifdef DEBUG
for(size_t n=0;n<sizeof(nti.nai);n++) printf("%02x ", *(((byte_t*)(&nti.nai)) + n));
printf("\n");
#endif // DEBUG
pn53x_InDeselect(pnd, 1);
}
}
}
*/
return true;
}