{TekCrack}

#include <avr/interrupt.h>
#include <SoftwareSerial.h>
#include <LCD4Bit.h>

#define rxPin 2
#define txPin 3
#define ledPin 13

// LCD Variables
int lcdLines = 4;    // number of lines in your display
int doutPin = 11;    // Dout pin
int strPin = 12;     // Strobe pin
int clkPin = 10;     // Clock pin

// RFID Variables
int  val = 0;
int bytesread = 0;
char code[10];
int flag = 0;
int granted = 0;

// setup construct for lcd
LCD4Bit lcd = LCD4Bit(lcdLines, doutPin, strPin, clkPin);

// set up a soft serial port
SoftwareSerial mySerial(rxPin, txPin);

void setup() {
  // define pin modes for tx, rx, led pins:
  pinMode(rxPin, INPUT);    // Set rxPin as INPUT to accept SOUT from RFID pin
  pinMode(txPin, OUTPUT);   // Set txPin as OUTPUT to connect it to the RFID /ENABLE pin
  pinMode(ledPin, OUTPUT);  // Let the user know whats up

  // set the data rate for the serial ports
  mySerial.begin(2400);    // RFID reader SOUT pin connected to Serial RX pin at 2400bps

  lcd.init();         // initialize lcd
  lcd.cursorTo(1,0);  // select first display controller, line 1 & 2
  lcd.clear();        // clear lines 1 & 2
  lcd.cursorTo(3,0);  // select second display controller, line 3 & 4
  lcd.clear();        // clear lines 3 & 4
 
  delay(100);

  defaultMsg();

  attachInterrupt(0, readRFID, LOW); // Setup interrupt for SOUT on RFID reader
  digitalWrite(txPin, LOW);           // Activate the RFID reader
}

void loop() {
  // Do Something

  goRFID(); 
}

void goRFID() {
  if (flag == 1) {
    delay(1000);
    lcd.cursorTo(1,0);
    lcd.clear();
    lcd.printIn("Welcome to DCA.");
    lcd.cursorTo(2,0);
    lcd.printIn("TAG code is: ");  // possibly a good TAG
    lcd.printIn(code);           // print the TAG code
    validateRFID(code);             // Determine if right tag used. */
    flag = 0;
    delay(5000);
    digitalWrite(txPin, LOW);           // Activate the RFID reader
    defaultMsg();
  } else {
    delay(1000);
    digitalWrite(txPin, LOW);           // Activate the RFID reader
    defaultMsg();
  }
}
   

void readRFID() {
  digitalWrite(ledPin, LOW);          // Turn off debug LED – Event triggered!
  if((val = mySerial.read()) == 10) { // check for header
    bytesread = 0;

    while(bytesread<10) {             // read 10 digit code
      val = mySerial.read();

      if((val == 10)||(val == 13)) {  // if header or stop bytes before the 10 digit reading
        break;                        // stop reading
      }

      code[bytesread] = val;          // add the digit          
      bytesread++;                    // ready to read next digit 
    }

    if(bytesread == 10) {             // If 10 digit read is complete
      digitalWrite(txPin, HIGH);      // deactivate RFID reader
      digitalWrite(ledPin, HIGH);     // activate LED to show an RFID card was read
      flag = 1;
    }

    bytesread = 0;
  }
}

void validateRFID(char* i) {
  if( strncmp(i,"0F0302A114", 10) == 0) {
    // if 10 digit code equals "0F0302A114"
    digitalWrite(ledPin, HIGH); 
    lcd.cursorTo(3,0);
    lcd.clear();
    lcd.printIn("Tag matches…Access Granted!");
    lcd.cursorTo(4,0);
    lcd.printIn("Firing squad avoided!");
    digitalWrite(ledPin, LOW);
  } else {
    lcd.cursorTo(3,0);
    lcd.clear();
    lcd.printIn("Tag Failed…Access Denied!");
    lcd.cursorTo(4,0);
    lcd.printIn("Firing squad deployed!");
    digitalWrite(ledPin, LOW);
  }
}