AN4430 datasheet(31/42 Pages) STMICROELECTRONICS

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AN4430

How to use ST NFC package to implement HW enhanced features

At this stage physical tag is supposed to be available in the NFC field. The anti-collision,

RATS, PPS sequences are already done and the Tag is accessible in read or write mode.

To select the TAG and set it in an accessible mode Android Application sends to the tag an

Application To Select command defined in 7816-4 specification. To do so, the Tag rawTag

can be mapped to an IsoDep android object in order to send a synchronous ATS command

to the physical tag. The defined command is sent to the tag by using the

private static NfcTagTypes decodeTagType (Tag pTag) {

NfcTagTypes lType = NfcTagTypes.NFC_TAG_TYPE_UNKNOWN;

List<String> lTechList = Arrays.asList(pTag.getTechList());

String nfcTechPrefixStr = "android.nfc.tech.";

// Try the Ndef technology

Ndef lNdefTag = Ndef.get(pTag);

if (lNdefTag != null) {

if (lNdefTag.getType().equals(Ndef.NFC_FORUM_TYPE_1)) {

lType = NfcTagTypes.NFC_TAG_TYPE_1;

} else if (lNdefTag.getType().equals(Ndef.NFC_FORUM_TYPE_2)) {

lType = NfcTagTypes.NFC_TAG_TYPE_2;

} else if (lNdefTag.getType().equals(Ndef.NFC_FORUM_TYPE_3)) {

lType = NfcTagTypes.NFC_TAG_TYPE_3;

} else if (lNdefTag.getType().equals(Ndef.NFC_FORUM_TYPE_4)) {

if (lTechList.contains(nfcTechPrefixStr+"NfcA")) {

lType = NfcTagTypes.NFC_TAG_TYPE_4A;

} else if (lTechList.contains(nfcTechPrefixStr+"NfcB")) {

lType = NfcTagTypes.NFC_TAG_TYPE_4B;

}

} else {

// Try the IsoDep technology

IsoDep lIsoDepTag = IsoDep.get(pTag);

if (lIsoDepTag != null) {

if (lTechList.contains(nfcTechPrefixStr+"NfcA")) {

lType = NfcTagTypes.NFC_TAG_TYPE_4A;

} else if (lTechList.contains(nfcTechPrefixStr+"NfcB")) {

lType = NfcTagTypes.NFC_TAG_TYPE_4B;

}

} else {

// Try the underlying technologies

if (lTechList.contains(nfcTechPrefixStr+"NfcA")) {

lType = NfcTagTypes.NFC_TAG_TYPE_A;

} else if (lTechList.contains(nfcTechPrefixStr+"NfcB")) {

lType = NfcTagTypes.NFC_TAG_TYPE_B;

} else if (lTechList.contains(nfcTechPrefixStr+"NfcF")) {

lType = NfcTagTypes.NFC_TAG_TYPE_F;

} else if (lTechList.contains(nfcTechPrefixStr+"NfcV")) {

lType = NfcTagTypes.NFC_TAG_TYPE_V;

}

return lType;

}

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