RFID WL-134A模块Arduino解码异常：标签ID计算错误排查

问题概述 #

• 已将动物标签阅读器连接到Arduino模块，借助用户red_car的代码成功读取数据，系统校验和通过、国家码输出正确，数据结构与手册及red_car示例匹配，但标签ID解码始终错误
• 使用手册示例数据测试：
  • 示例十六进制数据：02 31 37 31 41 39 32 35 33 41 33 34 38 33 30 30 31 30 30 30 30 30 30 30 30 30 30 07 f8 03
  • 转换为ASCII后：171A9253A34830010000000000
  • 手册定义：标签ID为第1-10字节，国家码为第11-14字节，预期结果为国家码900，标签ID250000023921

测试代码 #

byte buffer[30] = {0x02, 0x31, 0x37, 0x31, 0x41, 0x39, 0x32, 0x35, 0x33, 0x41, 0x33, 0x34, 0x38, 0x33, 0x30, 0x30, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x07, 0xf8, 0x03};
byte b;
uint8_t idx;
boolean started = false;

byte     XOR;
byte     inverted;

uint32_t   value;


void setup() {
  // Initialize serial communication at 9600 baud
  Serial.begin(9600);
  delay(1000);
  Serial.println("start:");
}

void loop() {
  
        // Print the contents of the buffer to Serial Monitor for verification
        for (int i = 0; i < sizeof(buffer); i++) {
          Serial.print(buffer[i], HEX);
          Serial.print(" ");
        }
        Serial.println();

        // Check we received the message ok.  XOR checksum on bytes 01-26 should match byte 27.
        XOR = buffer[1];
        for (int x = 2; x <= 26; x++)
        {
          XOR ^= buffer[x];  
        }
        Serial.print("Calculated checksum: ");
        Serial.print(XOR, HEX);

        if (XOR == buffer[27])
          Serial.println(" (Correct)");
        else
          Serial.println(" (Error)");


        // Check the inverted XOR checksum
        inverted = ~XOR;
        Serial.print("Inverted checksum: ");
        Serial.print(inverted, HEX);
        if (inverted == buffer[28])
          Serial.println(" (Correct)");
        else
          Serial.println(" (Error)");

        
        // Extract the card number from bytes 01 (LSB) - 10 (MSB).
        value = 0;
        for (int x = 10; x >= 1; x--)
        {
          if(buffer[x] <= '9')
            value = (value<<4) + buffer[x] - '0';  
          else
            value = (value<<4) + buffer[x] - '7';  
        }
        Serial.print("Card number: ");
        Serial.println(value);


        // Extract the country number from bytes 11 (LSB) - 14 (MSB).
        value = 0;
        for (int x = 14; x >= 11; x--)
        {
          if(buffer[x] <= '9')
            value = (value<<4) + buffer[x] - '0';
          else
            value = (value<<4) + buffer[x] - '7';  
        }
        Serial.print("Country number: ");
        Serial.println(value);


        // Extract the Data Block from byte 15.
        Serial.print("Data block: ");
        Serial.println(buffer[15] - '0');

        
        // Extract the Animal Flag from byte 16.
        Serial.print("Animal flag: ");
        Serial.println(buffer[16] - '0');

        Serial.println("\r");
delay(100000);
}

实际输出结果 #

2 31 37 31 41 39 32 35 33 41 33 34 38 33 30 30 31 30 30 30 30 30 30 30 30 30 30 7 F8 3 
Calculated checksum: 7 (Correct)
Inverted checksum: F8 (Correct)
Card number: 891920753
Country number: 900
Data block: 0
Animal flag: 1

核心诉求 #

当前校验和正确，但标签ID与预期结果不符，请求协助排查解码逻辑问题。

内容的提问来源于stack exchange，提问作者RyanMe321