A utility for scanning the I2C bus 0 and 1 of an Arduino DUE.

I2C_scan.ino

#include <Wire.h>

void i2cs(int arg) {

  int adr, err, cnt;

  Serial.print("Scanning bus: ");
  Serial.println(arg);
  
  cnt = 0;  
  for (adr=1; adr<127; adr++) {
    if (arg==1) {
          Wire1.beginTransmission(adr);
          err = Wire1.endTransmission();
    } else {
          Wire.beginTransmission(adr);
          err = Wire.endTransmission();
    }
    if (err == 0) {
      Serial.print("Detected device with adress: ");
      Serial.println(adr);
      cnt++;
    }
  }
  Serial.print("Number of detected devices: ");
  Serial.println(cnt);
}


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Wire.begin();
  Wire1.begin(); 
}

void loop() {
  // put your main code here, to run repeatedly:
  i2cs(0);
  i2cs(1);

  delay(10000);
}