#include <Arduino.h>
#include <Wire.h>

void setup()
{
  Serial.begin(115200);
  Serial.println("... 1 ...");
  delay (2000);   // pause before 2wire- init
  Serial.println("... 2 ...");
  Wire.begin();
  Serial.println("... 3 ...");
  delay (5000);
}

bool doScan = true;
bool quiet  = false;      // turn off interaction with chip

void loop()
{
  if(!quiet){
    
    if (!doScan) {

      if (!Wire.requestFrom(0x22, 1)) {
        Serial.println("Chip not responding. Did you create i2c-counter.chip.c?");
        delay(500);
      } else {
  //      Serial.print("Chip value: ");
        uint8_t value = Wire.read();
        Serial.print(value);
        Serial.print("\t");
        delay(200);

        if (value == 255) {
          Serial.print("\n");
          doScan = true;
        }
      }
    }

    else {

      byte error, address;
      int nDevices;
      Serial.println("Scanning...");
      nDevices = 0;
      for(address = 1; address < 127; address++ )
      {
        // The i2c_scanner uses the return value of
        // the Write.endTransmisstion to see if
        // a device did acknowledge to the address.
        Wire.beginTransmission(address);
        error = Wire.endTransmission();
        if (error == 0)
        {
          Serial.print("I2C device found at address 0x");
          if (address<16)
            Serial.print("0");
          Serial.print(address,HEX);
          Serial.println("  !");
          nDevices++;
        }
        else if (error==4)
        {
          Serial.print("Unknown error at address 0x");
          if (address<16)
            Serial.print("0");
          Serial.println(address,HEX);
        }    
      }
      if (nDevices == 0)
        Serial.println("No I2C devices found\n");
      else
        Serial.println("done\n");
      delay(200);
      doScan = false;
    }
  } // !quiet
}