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Create teensy_em-marine
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TerAnYu committed Feb 10, 2016
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/*
* HID RFID Reader Wiegand Interface for Arduino Uno
* Written by Daniel Smith, 2012.01.30
* www.pagemac.com
*
* This program will decode the wiegand data from a HID RFID Reader (or, theoretically,
* any other device that outputs weigand data).
* The Wiegand interface has two data lines, DATA0 and DATA1. These lines are normall held
* high at 5V. When a 0 is sent, DATA0 drops to 0V for a few us. When a 1 is sent, DATA1 drops
* to 0V for a few us. There is usually a few ms between the pulses.
*
* Your reader should have at least 4 connections (some readers have more). Connect the Red wire
* to 5V. Connect the black to ground. Connect the green wire (DATA0) to Digital Pin 2 (INT0).
* Connect the white wire (DATA1) to Digital Pin 3 (INT1). That's it!
*
* Operation is simple - each of the data lines are connected to hardware interrupt lines. When
* one drops low, an interrupt routine is called and some bits are flipped. After some time of
* of not receiving any bits, the Arduino will decode the data. I've only added the 26 bit and
* 35 bit formats, but you can easily add more.

*/

#include <stdio.h>

#define MAX_BITS 100 // max number of bits
#define WEIGAND_WAIT_TIME 3000 // time to wait for another weigand pulse.

unsigned char databits[MAX_BITS]; // stores all of the data bits
unsigned char bitCount; // number of bits currently captured
unsigned char flagDone; // goes low when data is currently being captured
unsigned int weigand_counter; // countdown until we assume there are no more bits

unsigned long facilityCode=0; // decoded facility code
unsigned long cardCode=0; // decoded card code

// interrupt that happens when INTO goes low (0 bit)
void ISR_INT0()
{
//Serial.print("0"); // uncomment this line to display raw binary
bitCount++;
flagDone = 0;
weigand_counter = WEIGAND_WAIT_TIME;

}

// interrupt that happens when INT1 goes low (1 bit)
void ISR_INT1()
{
//Serial.print("1"); // uncomment this line to display raw binary
databits[bitCount] = 1;
bitCount++;
flagDone = 0;
weigand_counter = WEIGAND_WAIT_TIME;
}

void setup()
{
pinMode(2, INPUT); // DATA0 (INT0)
pinMode(3, INPUT); // DATA1 (INT1)

Serial.begin(9600);

// binds the ISR functions to the falling edge of INTO and INT1
attachInterrupt(0, ISR_INT0, FALLING);
attachInterrupt(1, ISR_INT1, FALLING);


weigand_counter = WEIGAND_WAIT_TIME;
}

void loop()
{
// This waits to make sure that there have been no more data pulses before processing data
if (!flagDone) {
if (--weigand_counter == 0)
flagDone = 1;
}

// if we have bits and we the weigand counter went out
if (bitCount > 0 && flagDone) {
unsigned char i;


// we will decode the bits differently depending on how many bits we have
// see www.pagemac.com/azure/data_formats.php for mor info
if (bitCount == 35)
{
// 35 bit HID Corporate 1000 format
// facility code = bits 2 to 14
for (i=2; i<14; i++)
{
facilityCode <<=1;
facilityCode |= databits[i];
}

// card code = bits 15 to 34
for (i=14; i<34; i++)
{
cardCode <<=1;
cardCode |= databits[i];
}

printBits();
}
else if (bitCount == 26)
{
// standard 26 bit format
// facility code = bits 2 to 9
for (i=1; i<9; i++)
{
facilityCode <<=1;
facilityCode |= databits[i];
}

// card code = bits 10 to 23
for (i=9; i<25; i++)
{
cardCode <<=1;
cardCode |= databits[i];
}

printBits();
}

// cleanup and get ready for the next card
bitCount = 0;
facilityCode = 0;
cardCode = 0;
for (i=0; i<MAX_BITS; i++)
{
databits[i] = 0;
}
}
}

void printBits()
{
// I really hope you can figure out what this function does
// Serial.print("FC = ");
// Serial.print(facilityCode);
// Serial.print(", CC = ");
// Serial.println(cardCode);

char formatedFacilityCode[4];
sprintf(formatedFacilityCode, "%03lu", facilityCode);

char formatedcardCode[6];
sprintf(formatedcardCode, "%05lu", cardCode);

Serial.print(formatedFacilityCode); //Serial.print(facilityCode);
Serial.print("/");
Serial.print(formatedcardCode);
Serial.print("\n");

Keyboard.print(formatedFacilityCode); //Keyboard.print(facilityCode);
Keyboard.print("/");
Keyboard.print(formatedcardCode);
Keyboard.print("\n");

}

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