我使用示例代码从MIFARE Ultralight读取并写入MIFARE Classic,并在.h文件中定义:
#define PN532_RESPONSE_INDATAEXCHANGE (0x41)
#define MIFARE_CMD_WRITE (0xA0)
但是当我运行以下代码时:
/**************************************************************************/
uint8_t PN532::mifareultralight_WritePage (uint8_t page, uint8_t *buffer1)
{
/* Prepare the first command */
pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE;
pn532_packetbuffer[1] = 1; /* Card number */
pn532_packetbuffer[2] = MIFARE_CMD_WRITE; /* Mifare Write command = 0xA0 */
pn532_packetbuffer[3] = page; /* Page Number (0..63 in most cases) */
memcpy (pn532_packetbuffer + 4, buffer1, 4); /* Data Payload */
/* Send the command */
if (HAL(writeCommand)(pn532_packetbuffer, 8)) {
Serial.println(F("Go here 1"));
return 0;
}
Serial.println(F("Go here 2"));
/* Read the response packet */
return (0 < HAL(readResponse)(pn532_packetbuffer, sizeof(pn532_packetbuffer)));
}
结果如下:
Scan a NFC tag
write: 4A 1 0
read: 4B 1 1 0 44 0 7 4 C1 37 CA 2C 2C 80
ATQA: 0x 44SAK: 0x 0
Writing Mifare Ultralight
write: 40 1 30 4
read: 41 0 2 0 0 10 0 6 1 10 11 FF 0 0 0 0 0 0
write: 40 1 30 3
read: 41 0 0 0 0 0 2 0 0 10 0 6 1 10 11 FF 0 0
Tag capacity 0 bytes
write: 40 1 A0 5 1 2 3 4
Go here 2
Write failed 0
它没有进入“Go here 1”,这意味着没有写入命令给读者,有谁知道为什么?
答案 0 :(得分:2)
您正在使用的写命令似乎是错误的。您正在使用COMPATIBILITY_WRITE命令代码(0xA0
),但您传递了WRITE命令的参数。
我建议您坚持使用WRITE命令:
+-----------+------+------+---------------------+
| WRAPPING | CMD | ADDR | DATA (1 PAGE) |
+-----------+------+------+---------------------+
| 0x40 0x01 | 0xA2 | 0x05 | 0x01 0x02 0x03 0x04 |
+-----------+------+------+---------------------+
或者你也可以使用COMPATIBILITY_WRITE命令:
首先发送命令和地址:
+-----------+------+------+
| WRAPPING | CMD | ADDR |
+-----------+------+------+
| 0x40 0x01 | 0xA0 | 0x05 |
+-----------+------+------+
然后,您应该从标签收到ACK / NAK状态。
然后您在第二帧发送数据:
+-----------+---------------------+------------------------------------------------------------+
| WRAPPING | DATA (1 PAGE) | FILLER (3 EMPTY PAGES)
+-----------+---------------------+------------------------------------------------------------+
| 0x40 0x01 | 0x01 0x02 0x03 0x04 | 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+-----------+---------------------+------------------------------------------------------------+