CoCoDuino_Polling.ino

#define LED 13
#define SCS 0
#define RW 1

void setup() {
  pinMode(LED, OUTPUT);
  pinMode(SCS, INPUT);
  pinMode(RW, INPUT);
  digitalWrite(LED, HIGH);
}

void loop() {
  unsigned int scs;
  unsigned int previous_SCS = HIGH;
  unsigned int write_count = 0;
  unsigned int read_count = 0;

  while (1) {
    scs = digitalRead(SCS);

    if (previous_SCS == HIGH) {
      if (scs == LOW) {

        if (digitalRead(RW)) {
          read_count++;
          digitalWrite(LED, LOW);
        }
        else {
          write_count++;
          digitalWrite(LED, HIGH);
        }
      }
    }

    previous_SCS = scs;
  }
}