AN4430 datasheet(32/42 Pages) STMICROELECTRONICS

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How to use ST NFC package to implement HW enhanced features

AN4430

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DocID025722 Rev 1

IsoDep.tranceive(byte[]) command. Application then waits for the corresponding answer

(answer codes are listed and defined in both 7816-4 specification and in M24SR datasheet).

private static final byte[] NdefSelectAppliFrame = new byte[] { (byte) 0x00, (byte) 0xA4,

(byte) 0x04, (byte) 0x00, (byte) 0x07,

(byte) 0xD2, (byte) 0x76, (byte) 0x00,

(byte) 0x00,

(byte) 0x85, (byte) 0x01, (byte) 0x01};

// request ATS

public int requestATS()

{

byte[] transcieveAnswer = new byte[] { (byte) 0x01 };

if (isoDepCurrentTag == null)

isoDepCurrentTag = IsoDep.get(this.currentTag);

if (isoDepCurrentTag == null)

{

return 0;

}

int cpt = 0;

while (( transcieveAnswer[0] == 1 || transcieveAnswer[0] == (byte)0xAA) &&

cpt <= 1)

{

try {

if (!isoDepCurrentTag.isConnected())

{

isoDepCurrentTag.connect();

}

//isoDepCurrentTag.setTimeout(20);

transcieveAnswer =

isoDepCurrentTag.transceive(NdefSelectAppliFrame);

if (transcieveAnswer[0] == (byte) 0x90 && transcieveAnswer[1] ==

(byte) 0x00)

{

return 1;

}

else

{

cpt++;

return 0;

}

} catch (TagLostException e) {

// TODO Auto‐generated catch block

e.printStackTrace();

throw new RuntimeException("fail", e);

} catch (IOException e) {

// TODO Auto‐generated catch block

e.printStackTrace();

throw new RuntimeException("fail", e);

}

return 0;

} // End of ATS request

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