Writing a string to an i2c eprom with Arduino

gistfile1.txt

/* 
*  Use the I2C bus with EEPROM 24LC64 
*   
*/

#include <Wire.h> //I2C library

void writeEEPROM(char *string, unsigned char block, unsigned char address);
void printEEPRIOM();
void eraseEEPROM();

void setup() 
{
  Serial.begin(115200);
  Wire.begin(); // initialise the connection
  
  //CLEAR EEPROM
  eraseEEPROM();
  
  //WRITE DATA
//  writeEEPROM("STRING1",  80, 0x00);
  writeEEPROM("STRING2",  81, 0x00);
  writeEEPROM("STRING3",  82, 0x00);
  writeEEPROM("STRING4",   83, 0x00);

  // Verify the written data
  printEEPROM();
}

void loop() { delay(1000); }

void writeEEPROM(char *string, unsigned char block, unsigned char address) {
  // Is this how you set the address?
  // The bytes written can't be more than 16.
  int bytesWritten = 0;
  
  // Begin the transaction with the given i2c address
  Wire.beginTransmission(block);
  // Send the address to write
  Wire.write(address);

  // Write the preamble of 4 0xFFs
  for (int i = 0; i < 4; i++) { Wire.write(0xFF); }
  bytesWritten += 4;
  
  // Write the string
  for (int i = 0; string[i] != '\0'; i++) {
    Wire.write(string[i]);
    bytesWritten++;
  }
  
  // Write the postamble
  Wire.write('\0');
  bytesWritten++;
  for (int i = 0; i < 4 && bytesWritten < 16; i++) {
    Wire.write(0xFF);
    bytesWritten++;
  }
  
  // End the transcation
  Wire.endTransmission();
  
  // Make sure the device is done
  delay(10);
}

void printEEPROM() {
  // Print it to the console in columns of 16 bytes.
  // Convert 0xFF to '.' and 0x00 to *
  // Leave ASCII as ASCII, and print addresses
  Serial.println("Begin EEPROM Read Back");
  // The address of the first block is 80
  for(int i = 80; i < 84; i++) {
    Serial.print("Block 0x");
    Serial.print(i, HEX);
    Serial.println(": ");
    for(int j = 0; j < 255; j += 16) {
      Wire.beginTransmission(i); 
      Wire.write(j);
      Wire.endTransmission();

      // Print the address
      Serial.print("0x");
      Serial.print(j, HEX);
      if(j == 0) Serial.print("  ");
      else       Serial.print(" ");
      
      // Get the data
      Wire.requestFrom(i, 16);
      //Serial.print(i, DEC);
      for(int k = 0; k < 16; k++) {
        char retval = Wire.read();
        // Perform the pretty printing
        switch(retval) {
          case 0x00:
            Serial.print("*");
            break;
          case 0xFF:
            Serial.print(".");
            break;
          default:
            Serial.print(retval);
        }
      }
      Serial.println("");
    }
  }    
}

void eraseEEPROM() {
  //Write data to all locations
  int data = 255;  //Data to write to EEPROM
  int block = 80;  //dec 2 hex address conversion 80=0x50, 81=0x51, 82=0x52, 83=0x53
  
  // We need to write 4 blocks to the EEPROM
  for (int i = 0; i < 4; i++) {
    // Each block is 255 sets of 16 words
   for (int j = 0; j < 255; j += 16) {
     // Each transaction can be 16 words long
     // The i2c address is the "block"
     Wire.beginTransmission(block + i);
     // Send the lower address for the transaction
     Wire.write(j);
     for (int k = 0; k < 16; k++) {
       Wire.write(data);
     }
     Wire.endTransmission();
     delay(10);
   }
  }
}