Question

我试图通过NfcV对象使用WRITE MULTIPLE BLOCKS命令将一些数据写入NXP ICODE SLIX SL2S2002标签（ISO 15693）：

private void writeTagData(Tag tag) throws Exception {
    int offset = 0;
    int blocks = 19;

    String _writedata = "1hello34567850000071234561815064150220161603201016022018112233445552031033";
    byte[] data = _writedata.getBytes(StandardCharsets.UTF_8);
    data = Arrays.copyOfRange(data, 0, 4 * blocks );

    byte[] id = tag.getId();
    boolean techFound = false;
    for (String tech : tag.getTechList()) {
        if (tech.equals(NfcV.class.getName())) {
            techFound = true;
            NfcV nfcvTag = NfcV.get(tag);
            try {
                nfcvTag.connect();
            } catch (IOException e) {
                Toast.makeText(this, "IO Exception", Toast.LENGTH_LONG).show();
                return;
            }
            try {
                byte[] cmd = new byte[] {
                        (byte)0x20,
                        (byte)0x24,
                        (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
                        (byte)(offset & 0x0ff),
                        (byte)((blocks - 1) & 0x0ff)
                };
                System.arraycopy(id, 0, cmd, 2, 8);

                byte[] cmd_plus_data = new byte[88];
                System.arraycopy(cmd, 0, cmd_plus_data, 0, cmd.length);
                System.arraycopy(data, 0, cmd_plus_data, 12, data.length);

                byte[] response = nfcvTag.transceive(cmd_plus_data);
                String strResponse = Common.toHexString(response);
            } catch (IOException e) {
                Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
                return;
            }

            try {
                nfcvTag.close();
            } catch (IOException e) {
                Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
                return;
            }
        }
    }
}

transceive(...)方法的响应为010f（表示＆＃34;未知错误＆＃34;）。以前，我能够使用同一标签中的READ MULTIPLE BLOCKS命令成功读取数据。

我尝试在getMaxTransceiveLength()对象上调用NfcV，值为253.

Answer 1

ISO / IEC 15693将WRITE MULTIPLE BLOCKS命令定义为可选命令。由标签芯片（或实际上是其制造商）来实现此命令。

在您的情况下，恩智浦ICODE SLIX SL2S2xx2（就像所有（大多数？）ICODE SLI / SLIX标签一样）不支持WRITE MULTIPLE BLOCKS命令。因此，标签返回错误代码0x0F。 ICODE SLIX SL2S2xx2数据表定义了在不支持命令的情况下返回此错误代码。

相反，SL2S2xx2支持WRITE SINGLE BLOCK（0x21）命令。您可以在循环中使用该命令来编写所有数据：

byte[] cmd = new byte[] {
        /* FLAGS   */ (byte)0x20,
        /* COMMAND */ (byte)0x21,
        /* UID     */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
        /* OFFSET  */ (byte)0x00,
        /* DATA    */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00
};
System.arraycopy(id, 0, cmd, 2, 8);

for (int i = 0; i < blocks; ++i) {
    cmd[10] = (byte)((offset + i) & 0x0ff);
    System.arraycopy(data, 4 * i, cmd, 11, 4);

    byte[] response = nfcvTag.transceive(cmd);
}

通过NfcV写入多个块命令失败

1 个答案: