looking through an eeprom for a known sequence, "AB"

find_keys.ino

#include <Wire.h>    
 
#define disk1 0x50    //Address of 24LC256 eeprom chip
 
void setup(void)
{
  Serial.begin(9600);
  Wire.begin();  
 
  unsigned int address = 0x3571;
 
  
  //Serial.print(readEEPROM(disk1, address), DEC);
  long int i;
  byte last=0x00;
  byte in =0x00;
  for(i = 0x3500; i<0x6000; i++)
  {
   last=in;
   in = readEEPROM(disk1,i);
   
   if ((char)in == 'B' && (char)last =='A')
   {
    Serial.print("AB @ ");
    Serial.println(i-1,HEX);
   } 
   
  }
}
 
void loop(){}
 
void writeEEPROM(int deviceaddress, unsigned int eeaddress, byte data ) 
{
  Wire.beginTransmission(deviceaddress);
  Wire.write((int)(eeaddress >> 8));   // MSB
  Wire.write((int)(eeaddress & 0xFF)); // LSB
  Wire.write(data);
  Wire.endTransmission();
 
  delay(5);
}
 
byte readEEPROM(int deviceaddress, unsigned int eeaddress ) 
{
  byte rdata = 0xFF;
 
  Wire.beginTransmission(deviceaddress);
  Wire.write((int)(eeaddress >> 8));   // MSB
  Wire.write((int)(eeaddress & 0xFF)); // LSB
  Wire.endTransmission();
 
  Wire.requestFrom(deviceaddress,1);
 
  if (Wire.available()) rdata = Wire.read();
 
  return rdata;
}