Hello, I'm not very familiar with how interrupt pins work on either the Uno or Mega but I have code that works on an Uno but doesn't work using the same pins on a Mega. I'll attach the code here so you can take a look for yourself. It's not my code, just something I found online and am trying to modify. The issue specifically is with reading data on pins D2 & D3. Everything works fine on uno but it seems like the interrupt pins used to read the data aren't working on a Mega. Can I just use the same code but attach the data0 and data1 wires to different pins on the board? If so, what pins? or could I use the same pins but change the code a little so it works? If so, then what do I need to change?
/* HID ProxPoint Skimmer
* Brad Antoniewicz
*
* This is a prototype for a skimmer that sits between a
* HID ProxPoint reader and a VertX Controller
*
* It will take data recieved from the Reader, print it
* and send it to the controller
* It will also take data recieved from the Serial interface
* on the Arduino (in Binary) and send it to the controller
*
* Arduino Pinouts:
* 2 - ProxPoint Green (DATA 0)
* 3 - ProxPoint White (DATA 1)
* 8 - Output to VertX Data 0 (Green)
* 9 - Output to VertX Data 1 (White)
* 11 - VertX Strike Relay NO 1
* 12 - VertX Strike Relay NO 2
* 13 - LED
* 5V - To ProxPoint Red
* GND - To ProxPoint Black
* GND - To VertX Ground (Black)
*
* All of the Remaining ProxPoint wires can be plugged into the VertX
* or left out.
*
* 26-Bit Wiegant Format:
* Bit 1 = Even Parity over Bits 2 - 13
* Bits 2 - 9 = Facility Code (0 to 255) Bit 2 is MSB
* Bits 10 - 25 = ID Number (0 to 65,535) Bit 10 is MSB
* Bits 26 Odd parity over bits 14 to 25
*
*
* Disclaimer - I know this code is REALLY sloppy and inefficient
* Please don't judge me :)
*/
#define CARD_LEN 26
#define LED 13 // output LED
#define VX_D0 8 // output DATA0 (Green) to Controller
#define VX_D1 9 // output DATA1 (White) to Controller
#define VX_NO1 11 // input VertX Strike Relay NO 1
#define VX_NO2 12 // input VertX Strike Relay NO 2
unsigned long cardValue = 0;
int incomingByte = 0;
int sInputCount = 0;
/* This code is for processing data from the reader - Thanks Mike Cook!
*/
volatile unsigned long reader1 = 0;
volatile int reader1Count = 0;
void reader1One(void) {
reader1Count++;
reader1 = reader1 << 1;
reader1 |= 1;
}
void reader1Zero(void) {
reader1Count++;
reader1 = reader1 << 1;
}
void isr(int action) {
if ( action == 1 ) { // Start
/* Crazy People Timing and ISR -- Thanks Mike Cook! */
attachInterrupt(0, reader1Zero, FALLING);//DATA0 to pin 2
attachInterrupt(1, reader1One, FALLING); //DATA1 to pin 3
delay(10);
} else { // Stop
detachInterrupt(0);
detachInterrupt(1);
}
}
// END Reader In
void resetState() {
Serial.println("[+] Reseting State...");
delay(10);
Serial.flush();
sInputCount=0;
reader1 = 0;
reader1Count=0;
}
void writeCard(volatile unsigned long sendValue) {
Serial.println("[-] Sending Data:");
Serial.print("\t");
for (short x=CARD_LEN; x>=0; x--) {
if ( bitRead(sendValue,x) == 1 ) {
Serial.print("1");
digitalWrite(VX_D1, LOW);
delayMicroseconds(34);
digitalWrite(VX_D1, HIGH);
} else if ( bitRead(sendValue,x) == 0 ) {
Serial.print("0");
digitalWrite(VX_D0, LOW);
delayMicroseconds(34);
digitalWrite(VX_D0, HIGH);
}
delay(2);
}
Serial.println();
}
void processInput(int byte) {
if (byte == 49) { // DECIMAL 1
sInputCount++;
bitSet(cardValue, CARD_LEN - sInputCount);
} else if (byte == 48) { // DECIMAL 0
sInputCount++;
bitClear(cardValue, CARD_LEN - sInputCount);
} else if (byte == 98 || byte == 66) { // b or B
Serial.println("[-] Entering Brute Force Mode, provide starting value:");
// doDecBrute();
} else {
Serial.print("[!] Recieved invalid Value:");
Serial.println(byte);
resetState();
}
}
void printCardData(unsigned long data) {
int serialNumber = (data >> 1) & 0x3fff;
int siteCode = (data >> 17) & 0x3ff;
Serial.print("\tH: ");
Serial.print(data,HEX);
Serial.print(" SC: ");
Serial.print(siteCode);
Serial.print(" C: ");
Serial.println(serialNumber);
Serial.print("\tB: ");
Serial.println(data, BIN);
}
void setup()
{
/* This stuff is for the Door Sensor LED */
pinMode(LED, OUTPUT);
digitalWrite(LED, LOW);
digitalWrite(LED, HIGH);
pinMode(VX_NO1, INPUT); // Reader 1
pinMode(VX_NO2, INPUT); // Reader 2
// End Door Sensor Stuff
/* Reader In - */
isr(0);
isr(1);
for(int i = 2; i<4; i++){
pinMode(i, OUTPUT);
digitalWrite(i, HIGH); // enable internal pull up causing a one
digitalWrite(i, LOW); // disable internal pull up causing zero and thus an interrupt
pinMode(i, INPUT);
digitalWrite(i, HIGH); // enable internal pull up
}
delay(10);
reader1 = 0;
reader1Count = 0;
//End Reader In
pinMode(VX_D0,OUTPUT);
digitalWrite(VX_D0, HIGH);
pinMode(VX_D1,OUTPUT);
digitalWrite(VX_D1, HIGH);
sInputCount = 0;
Serial.begin(38400);
Serial.println("Please provide a tag value");
Serial.println("For Binary input, it must be 26 bits long");
Serial.println("No parity needs, just add two 0's to the beginning");
Serial.println("e.g. 00001001100011111110010101");
}
void loop() {
/* This stuff is for the Door Sensor LED */
int reader1Status = digitalRead(VX_NO1);
int reader2Status = digitalRead(VX_NO2);
if ( reader1Status == HIGH || reader2Status == HIGH ) {
Serial.println("--- D o o r U n l o c k e d ---");
digitalWrite(LED, LOW);
delay(4000);
digitalWrite(LED, HIGH);
}
// End Door Sensor Stuff
/* Start Serial In
All this stuff does is accept input via the serial interface
*/
if (Serial.available() > 0 ) {
incomingByte = Serial.read();
Serial.print(".");
delay(10);
processInput(incomingByte);
if ( ( sInputCount > 0 ) && ( sInputCount != CARD_LEN ) && ( Serial.peek() == -1 ) ) {
Serial.println("\n[!] Invalid Input Length!");
resetState();
}
}
if (sInputCount == CARD_LEN) {
Serial.println("");
Serial.println("[-] Sending current Serial Buffer");
writeCard(cardValue);
resetState();
} else if (sInputCount > CARD_LEN) {
Serial.println("[!] Sorry, looks like your input was too long.. ");
resetState();
}
// End Serial In
/* Start Reader IN
All this stuff does is take data in from the reader
then send it to the controller
*/
if(reader1Count >= 26){
Serial.println("");
Serial.println("[+] Recieved input from Reader:");
Serial.println("-------------------------------");
printCardData(reader1);
Serial.println("[+] Sending input to Controller:");
writeCard(reader1);
resetState();
Serial.println("-------------------------------");
}
// END Reader IN
}