78 lines
2.7 KiB
Plaintext
78 lines
2.7 KiB
Plaintext
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// RFID reader ID-12 for Arduino
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// Based on code by BARRAGAN <http://people.interaction-ivrea.it/h.barragan>
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// and code from HC Gilje - http://hcgilje.wordpress.com/resources/rfid_id12_tagreader/
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// Modified for Arudino by djmatic
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// Modified for ID-12 and checksum by Martijn The - http://www.martijnthe.nl/
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//
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// Use the drawings from HC Gilje to wire up the ID-12.
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// Remark: disconnect the rx serial wire to the ID-12 when uploading the sketch
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void setup() {
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Serial.begin(9600); // connect to the serial port
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}
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void loop () {
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byte i = 0;
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byte val = 0;
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byte code[6];
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byte checksum = 0;
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byte bytesread = 0;
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byte tempbyte = 0;
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if(Serial.available() > 0) {
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if((val = Serial.read()) == 2) { // check for header
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bytesread = 0;
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while (bytesread < 12) { // read 10 digit code + 2 digit checksum
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if( Serial.available() > 0) {
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val = Serial.read();
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if((val == 0x0D)||(val == 0x0A)||(val == 0x03)||(val == 0x02)) { // if header or stop bytes before the 10 digit reading
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break; // stop reading
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}
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// Do Ascii/Hex conversion:
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if ((val >= '0') && (val <= '9')) {
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val = val - '0';
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} else if ((val >= 'A') && (val <= 'F')) {
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val = 10 + val - 'A';
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}
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// Every two hex-digits, add byte to code:
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if (bytesread & 1 == 1) {
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// make some space for this hex-digit by
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// shifting the previous hex-digit with 4 bits to the left:
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code[bytesread >> 1] = (val | (tempbyte << 4));
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if (bytesread >> 1 != 5) { // If we're at the checksum byte,
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checksum ^= code[bytesread >> 1]; // Calculate the checksum... (XOR)
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};
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} else {
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tempbyte = val; // Store the first hex digit first...
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};
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bytesread++; // ready to read next digit
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}
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}
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// Output to Serial:
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if (bytesread == 12) { // if 12 digit read is complete
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Serial.print("5-byte code: ");
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for (i=0; i<5; i++) {
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if (code[i] < 16) Serial.print("0");
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Serial.print(code[i], HEX);
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Serial.print(" ");
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}
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Serial.println();
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Serial.print("Checksum: ");
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Serial.print(code[5], HEX);
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Serial.println(code[5] == checksum ? " -- passed." : " -- error.");
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Serial.println();
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}
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bytesread = 0;
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}
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}
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}
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