AN4430 datasheet(33/42 Pages) STMICROELECTRONICS

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AN4430

How to use ST NFC package to implement HW enhanced features

If the transceiveAnswer is equal to 0x9000 then the current physical tag is in application

select mode and the tag file structure can be addressed.

In the same way activity can send the specific command to address the CCfile. CCFile is

known to get a standardized ID: 0xE103. To get the CCFile, application sends the following

message sequence:

•

Select the file with the ID 0xE103

•

Read the file size of the CCFile

•

Read the binary of size previously request which is corresponding to the file.

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

(byte) 0x00, (byte) 0x0C, (byte) 0x02,

(byte) 0xE1, (byte) 0x03 };

public int requestCCSelect()

{

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

if (isoDepCurrentTag == null)

isoDepCurrentTag = IsoDep.get(this.currentTag);

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(CCSelect);

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

(byte) 0x00)

{

return 1;

}

else

{

cpt++;

return 0;

}

} catch (IOException e) {

// TODO Auto‐generated catch block

e.printStackTrace();

throw new RuntimeException("fail", e);

}

return 0;

} // End of requestCCSelect

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