我试图使用SECTOR_SELECT读写指定扇区,但是在通过MifareUltralight.transceive()
发送命令的第二部分时得到TagLostException
。我如何选择和操纵部门?MifareUltralight:扇区选择原因TagLostException
我正在使用Android Nexus 6(6.0.1)向NXP NTAG(NT3H1201)发送命令并从中获取数据。我可以使用带收发器的GET_VERSION命令(60h)(通过NfcA
和MifareUltralight
)。
我使用选择一个部门的方法:
public void selectSector(byte sector, MifareUltralight mifareUltralight) throws IOException {
if (mifareUltralight.isConnected()) {
mifareUltralight.close();
}
// SECTOR_SELECT command (see nxp p. 46)
byte[] sectorSelectCmdPacket1 = new byte[2];
byte[] sectorSelectCmdPacket2 = new byte[4];
sectorSelectCmdPacket1[0] = (byte) 0xc2; // Sector select command
sectorSelectCmdPacket1[1] = (byte) 0xff;
sectorSelectCmdPacket2[0] = sector; // Memory sector to be selected; 1 for I2C 2k version
sectorSelectCmdPacket2[1] = (byte) 0x00;
sectorSelectCmdPacket2[2] = (byte) 0x00;
sectorSelectCmdPacket2[3] = (byte) 0x00;
mifareUltralight.connect();
try {
// ACK = 0A
byte[] sectorSelectResp1 = mifareUltralight.transceive(sectorSelectCmdPacket1);
Log.w(TAG, bytesToHex(sectorSelectResp1));
} catch (IOException e) {
Log.w(TAG, "selectSector: there was an exception while sending first sector select command");
e.printStackTrace();
}
try {
mifareUltralight.transceive(sectorSelectCmdPacket2);
Log.w(TAG, "Second sector select command sent");
} catch (IOException e) {
Log.w(TAG, "selectSector: there was an exception while sending second sector select command");
e.printStackTrace();
}
mifareUltralight.close();
}
当我打电话selectSector方法,第一收发完成,但第二次却没有,导致错误
机器人。 nfc.TagLostException:标记丢失。
如何在没有得到TagLostException
的情况下选择和操作扇区?
这是非常有用的信息。谢谢,迈克尔! – fipoceilz7
你会推荐哪些资源来学习这方面的知识? – fipoceilz7
@ fipoceilz7我没有意识到任何有用的公共资源(除了自己试验和挖掘Android NFC堆栈)。我们确实提供培训;-) –