101 lines
2.4 KiB
C++
101 lines
2.4 KiB
C++
/* Based on:
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* HID RFID Reader Wiegand Interface for Arduino Uno
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* Originally by Daniel Smith, 2012.01.30 -- http://www.pagemac.com/projects/rfid/arduino_wiegand
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*
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* Updated 2016-11-23 by Jon "ShakataGaNai" Davis.
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* See https://obviate.io/?p=7470 for more details & instructions
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*/
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#include <limits.h>
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#include <Keyboard.h>
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// DATA pins
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#define DATA0 2
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#define DATA1 3
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// LED pins
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#define LED_GREEN 11;
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#define LED_RED 12;
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#define BEEP_BEEP 10;
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#define WEIGAND_WAIT_TIME 500 // time to wait for another weigand pulse.
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#define DATA_SIZE 32
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volatile uint32_t dataBits = 0; // stores all of the data bits
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volatile size_t bitCount = 0; // number of bits recieved
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volatile unsigned long weigand_idle_start;
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inline void gotBit() {
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weigand_idle_start = millis();
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bitCount++;
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}
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// interrupt that happens when INTO goes low (0 bit)
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void ISR_INT0() {
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//Serial.print("0");
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dataBits &= ~(1UL << (DATA_SIZE - bitCount));
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gotBit();
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}
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// interrupt that happens when INT1 goes low (1 bit)
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void ISR_INT1() {
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//Serial.print("1");
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dataBits |= 1UL << (DATA_SIZE - bitCount);
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gotBit();
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}
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void setup() {
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pinMode(DATA0, INPUT);
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pinMode(DATA1, INPUT);
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Serial.begin(9600);
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attachInterrupt(digitalPinToInterrupt(DATA0), ISR_INT0, FALLING);
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attachInterrupt(digitalPinToInterrupt(DATA1), ISR_INT1, FALLING);
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Keyboard.begin();
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}
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void loop()
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{
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// if we have bits and we the weigand counter went out
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if (bitCount > 0 && (millis() - weigand_idle_start) >= WEIGAND_WAIT_TIME) {
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unsigned char i;
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uint32_t data = dataBits >> (DATA_SIZE - bitCount + 1);
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Serial.print("Read ");
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Serial.print(bitCount);
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Serial.print(" bits: ");
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Serial.println(data, BIN);
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// standard 26 bit format:
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// P: parity bit, F: facility code, C: card code
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// PFFFFFFFFCCCCCCCCCCCCCCCCP
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if (bitCount == 26) {
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uint8_t facilityCode = (data >> 17);
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uint16_t cardCode = (data >> 1);
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// TODO: check parity bits
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Keyboard.print(facilityCode);
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Keyboard.print('\t');
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Keyboard.print(cardCode);
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Keyboard.print('\n');
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printBits(facilityCode, cardCode);
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}
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else {
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// TODO: handle failures and other formats
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}
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// reset for the next card
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bitCount = 0;
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}
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}
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void printBits(uint8_t facilityCode, uint16_t cardCode) {
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Serial.print("FC = ");
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Serial.print(facilityCode);
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Serial.print(", CC = ");
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Serial.println(cardCode);
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}
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