[英]Turning off the buzzer on NFC reader ( NFC ACR122U) in Java
我在使用NFC卡的Java程序中使用ACR122U NFC读取器。 但是默认情况下,读取器在读取卡时会发出嗡嗡声。 我试图通过关闭NFC阅读器文档(此处为http://www.acs.com.hk/download-manual/419/API-ACR122U-2.03.pdf )显示关闭,但您无法关闭它蜂鸣器。 但是我很难为它编写一个Java方法。 如您所见,我的班级已经具有与NFC阅读器通信的方法。 但是我无法将文档中显示的命令转换为java方法。
NFCcard类:
package dataStores;
import java.util.List;
import javax.smartcardio.Card;
import javax.smartcardio.CardChannel;
import javax.smartcardio.CardException;
import javax.smartcardio.CardTerminal;
import javax.smartcardio.CommandAPDU;
import javax.smartcardio.ResponseAPDU;
import javax.smartcardio.TerminalFactory;
public class NFCcard {
private TerminalFactory factory;
private List<CardTerminal> terminals;
private CardTerminal terminal;
private Card card ;
public CardChannel cardChannel;
public NFCcard() throws CardException {
factory = TerminalFactory.getDefault();
terminals = factory.terminals().list();
terminal = terminals.get(0);
card = terminal.connect("*");
cardChannel = card.getBasicChannel();
cardChannel.transmit( new CommandAPDU(new byte[] { (byte)0xE0, (byte)0x00, (byte)0x00, (byte)0x21, (byte)0x01,(byte)0x77 }));
}
public String getCardID() throws CardException{
String cardID = "";
ResponseAPDU answer=cardChannel.transmit( new CommandAPDU(new byte[] { (byte)0xFF, (byte)0xCA, (byte)0x00, (byte)0x00, (byte)0x00 }));
byte r[] = answer.getData();
for (int i=0; i<r.length; i++)
cardID+=r[i];
return cardID;
}
}
您可以尝试这样的事情:
byte buzzerOn = (byte)0xFF;
byte buzzerOff = (byte)0x00;
byte clazz = (byte)0xFF;
byte ins = (byte)0x00;
byte p1 = (byte)0x52;
byte p2 = buzzerOff;
byte le = (byte)0x00;
byte[] apdu = new byte[]{clazz,ins,p1,p2,le};
ResponseAPDU answer = cardChannel.transmit( new CommandAPDU(apdu));
byte successSW1 = (byte)0x90;
byte successSW2 = (byte)0x00;
if(answer.getSW1() == successSW1 && answer.getSW2() == successSW2){
//done
}else{
//failed
}
响应必须为90 00
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