Smartcard reset

#define RESET_PIN 2
#define CLK_PIN 3
#define IO_PIN 4

#define LEN 32

unsigned long multiplier = 1;

void setup()
{
  pinMode(RESET_PIN, OUTPUT);
  pinMode(CLK_PIN, OUTPUT);
  pinMode(IO_PIN, INPUT);

  Serial.begin(115200);
  Serial.println("Ready.");
}

byte atr[LEN];
int index = 0;
void loop()
{
  reset();
  for(index = 0; index < LEN; index++)
  {
    clk(index);
  }
  for(index = 0; index < LEN; index++)
  {
    Serial.print(atr[index]);
  }
  Serial.println();
  delay(3000);
}

void clk(int i)
{
  delayMicroseconds(60 * multiplier);
  digitalWrite(RESET_PIN, HIGH);
  delayMicroseconds(10 * multiplier);
  atr[i] = digitalRead(IO_PIN);
  delayMicroseconds(10 * multiplier);
  digitalWrite(RESET_PIN, LOW);
}

void reset()
{
  digitalWrite(RESET_PIN, HIGH);
  delayMicroseconds(60 * multiplier);
  digitalWrite(CLK_PIN, HIGH);
  delayMicroseconds(30 * multiplier);
  digitalWrite(CLK_PIN, LOW);
  delayMicroseconds(20 * multiplier);
  digitalWrite(RESET_PIN, LOW);
}