Embedded Arduino RFID校验和计算和密钥可视化
我将此模块用于Arduino Ethernet R3，我需要从软件序列中检索写在标签外的卡ID。 模块上显示有14个字节被发送到Arduino。第一个是页眉，最后一个是页脚，页脚前的2个字节是校验和，其他10个字节是包含标记ID的ASCII数据 如何重新创建卡的ID并控制校验和？例如，对于ID为0013530444的标记，Arduino响应为：Embedded Arduino RFID校验和计算和密钥可视化,embedded,arduino,Embedded,Arduino,我将此模块用于Arduino Ethernet R3，我需要从软件序列中检索写在标签外的卡ID。 模块上显示有14个字节被发送到Arduino。第一个是页眉，最后一个是页脚，页脚前的2个字节是校验和，其他10个字节是包含标记ID的ASCII数据 如何重新创建卡的ID并控制校验和？例如，对于ID为0013530444的标记，Arduino响应为： I received: 2 I received: 51 I received: 67 I received: 48 I received: 48 I
I received: 2
I received: 51
I received: 67
I received: 48
I received: 48
I received: 67
I received: 69
I received: 55
I received: 53
I received: 52
I received: 67
I received: 67
I received: 66
I received: 3
有人能帮我吗？这里是如何计算校验和的演练 带上你的卡号这是直接从你的文字中引用的
I received: 2
I received: 51
I received: 67
I received: 48
I received: 48
I received: 67
I received: 69
I received: 55
I received: 53
I received: 52
I received: 67
I received: 67
I received: 66
I received: 3
毫无疑问，其他人可以想出比这更好的方法，但这里应该有足够的伪代码供您自己编写。下面是如何计算校验和的演练 带上你的卡号这是直接从你的文字中引用的
I received: 2
I received: 51
I received: 67
I received: 48
I received: 48
I received: 67
I received: 69
I received: 55
I received: 53
I received: 52
I received: 67
I received: 67
I received: 66
I received: 3
毫无疑问，其他人可以想出比这更好的方法，但这里应该有足够的伪代码供您自己编写。我发现它在Arduino中有一个实现，我已经将其改编为在Java中工作，结果很好。因为有很多按位运算，我过去常常试图理解发生了什么。除了我发现的在Arduino中有一个实现的val | tempbyte之外，我了解所有这些内容，我已经将其应用到Java中，结果很好。因为有很多按位运算，我过去常常试图理解发生了什么。除了val | tempbyte之外，我了解所有内容。您可以在这里找到一个ASCII表：供您手动计算。前两个字节是制造商id。。所以写在卡上的数字应该是CE 75 4C或13530444 convertedHi hovo，你是如何用CE 75 4C ty0xCE754C=13530444获得13530444的你是我的英雄，+1你可以在这里找到一个ASCII表：供你手动计算。前两个字节是制造商id。。所以写在卡片上的号码应该是CE
75 4C或13530444 convertedHi hovo，你是如何用CE 75 4C ty0xCE754C=13530444获得13530444的你是我的英雄， +1@dda您编辑了我的回答，说原始代码是用Arduino编写的-阿法伊克·阿杜伊诺是唯一的硬件-为Arduino编写的代码是C/C++。@dda您编辑了我的回答，说原始代码是用Arduino编写的-阿法伊克·阿杜伊诺是唯一的硬件-为Arduino编写的代码是C/C++。
//assume you have checksum as int and code as int array. it will overflow if bytes are used like above example
public void run() {
Log.d(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
while (true) {
Log.d(TAG, "Running");
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
for (int i = 0; i < bytes; i++) {
Log.d(TAG, "Reading: " + i + " of " + bytes + " from input stream");
byte b = buffer[i];
try {
if(bytesread >= 0) {
//just printing ASCII
char printableB = (char) b;
if (b < 32 || b > 126) printableB = ' ';
Log.d(TAG, "'" + Character.toString(printableB) + "' (" + Integer.toString(b) + ")");
if((b == 0x0D)||(b == 0x0A)||(b == 0x03)||(b == 0x02)) {
// if header or stop bytes before the 10 digit reading
Log.e(TAG, i + " Unexpected header while processing character " + Integer.toString(b));
} else {
// Do ASCII/Hex conversion
if ((b >= '0') && (b <= '9')) {
b = (byte) (b - '0');
} else if ((b >= 'A') && (b <= 'F')) {
b = (byte) (10 + b - 'A');
}
if ((bytesread & 1) == 1) {
//if isOdd(bytesread)
// make some space for this hex-digit by shifting the previous hex-digit with 4 bits to the left:
code[bytesread >> 1] = (b | (tempbyte << 4));
if (bytesread >> 1 != 5) {
// If we're not at the checksum byte,
checksum ^= code[bytesread >> 1];
// Calculate the checksum... (XOR)
}
} else {
// Store the first hex digit first
tempbyte = b;
}
}
bytesread++;
} else if(b == 2) {
bytesread = 0;
Log.d(TAG, "Header found!");
}
if(bytesread == 12) {
String check = (code[5] == checksum ? "-passed" : "-error");
String r = "";
for(int j = 0; j < 5; j++){
r += Integer.toString(code[i]);
}
Log.d(TAG, "Check:" + Integer.toString(code[5]) + check);
init();
} else if(bytesread > 12){
Log.e(TAG, "Too many bytes!");
}
} catch (Exception e) {
Log.e(TAG, i + " Exception while processing character " + Integer.toString(b), e);
}
}
String a = buffer.toString();
a = "";
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
connectionLost();
break;
}
}
Log.i(TAG, "END mConnectedThread");
}