AN4430 datasheet(34/42 Pages) STMICROELECTRONICS

34 / 42 page

How to use ST NFC package to implement HW enhanced features

AN4430

34/42

DocID025722 Rev 1

private static final byte[] CCReadLength = new byte [] {(byte) 0x00, (byte) 0xB0,

(byte) 0x00, (byte) 0x00, (byte)

0x02};

public int requestCCReadLength()

{

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

if (isoDepCurrentTag == null)

isoDepCurrentTag = IsoDep.get(this.currentTag);

int cpt = 0;

int CCLength = 0;

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

cpt <= 1)

{

try {

if (!isoDepCurrentTag.isConnected())

{

isoDepCurrentTag.connect();

isoDepCurrentTag.setTimeout(20);

}

transcieveAnswer = isoDepCurrentTag.transceive(CCReadLength);

if (transcieveAnswer[2] == (byte) 0x90 && transcieveAnswer[3] ==

(byte) 0x00)

{

CCLength = (int)((transcieveAnswer[0] & 0xFF)<<8) +

(int)(transcieveAnswer[1]&0xFF);

return CCLength;

}

else

{

cpt++;

return 0;

}

} catch (IOException e) {

// TODO Auto‐generated catch block

e.printStackTrace();

throw new RuntimeException("fail", e);

}

return 0;

} // End of CCReadLength request

AN4430 Datasheet(PDF) 34 Page - STMicroelectronics

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