产生6A 81的APDU write命令

ACS ACR1255 reader/writer 读取/写入NFC标记。

我可以使用这个APDU命令(从块04h开始,读取16个字节)很好地读取它:

String APDU_COMMAND_READ_16_BYTES =
        "FF" // Class: FFh
        + " B0" // Instruction: Read Binary Blocks
        + " 00" // P1: 00h
        + " 04" // P2: Block Number (the starting block)
        + " 10"; // Le: Number of bytes to read (10h = 16 bytes = 1 block)

然而,我没有太多的运气试图写卡。当我尝试此命令时:

String APDU_COMMAND_WRITE_16_BYTES =
        "FF" // Class: FFh
                + " D0" // Instruction: Write Binary Blocks
                + " 00" // P1: 00h
                + " 04" // P2: Block Number (the starting block)
                + " 10" // Lc: Length of data field (10h = 16 bytes = 1 block)
                + " 01 02 03 04 05 06 07 08 01 02 03 04 05 06 07 08" // String of data units to be written
                + ""; // Le: Empty

…我得到的答复是: 6A 81

根据表12 this page ,和 6A 部分是指 . 然而,表18显示 81 “不支持函数” .

注意-所讨论的标签是 MIFARE Ultralight EV1 MFOUL21 . (我可以用Android的 MifareUltralight 班级。)