在 Java 中关闭 NFC reader ( NFC ACR122U) 上的蜂鸣器

Question

我在使用 NFC 卡的 java 程序中使用 ACR122U NFC reader。但默认情况下 reader 在读取卡片时会发出蜂鸣声。我试图通过 NFC reader 文档（在此处找到：http://www.acs.com.hk/download-manual/419/API-ACR122U-2.03.pdf）显示您可以关闭蜂鸣器但没有成功将其关闭。但是我在为它编写 java 方法时遇到了问题。如您所见，我的 class 已经具有与 NFC reader 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。

NFC卡class：

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;
    }

}

Answer 1

您可以尝试这样的操作：

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
}

响应必须是 90 00

在 Java 中关闭 NFC reader ( NFC ACR122U) 上的蜂鸣器

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