I2C EEPROM programmer

Projects Programming
15

Here is some code which demonstrates how to set up block data and write it to eeprom. You should be able to adapt it to your data.

//possible page boundary issue unless all writes at 16 bytes
#include <Wire.h>
#define ADDRESS 0x50 //Address of EEPROM

unsigned int memAddress = 0;//starting eeprom address
int totalBytes = 720;//total byte number multiple of 16
const byte blockLength = 16; //will avoid page boundary in eeprom
const byte numberOfBlocks = totalBytes/blockLength;

//test data visuallyto confirm pattern
//EDIT: correct declaration of byte fileData
byte fileData[][blockLength] =
{
  {0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0},
};

void setup() {
  Serial.begin(115200);
  Wire.begin();

  for (int i = 0; i <= numberOfBlocks - 1; i++)
  {
    writeBytes( ADDRESS, memAddress, fileData[i], blockLength);
    memAddress += blockLength;
  }

  memAddress = 0;//reset address for read

  for (int i = 0; i <= numberOfBlocks - 1; i++)
  {
    readBytes(ADDRESS, memAddress, blockLength);
    memAddress += blockLength;
  }
}

void loop() {}

void writeBytes(int device, unsigned int Address, byte* data, byte len)
{
  Wire.beginTransmission(device);
  Wire.write(Address >> 8 ); //MSB
  Wire.write(Address & 0xFF); // LSB
  Wire.write(data, len);
  Wire.endTransmission();
  delay(5);//small delay for eeprom to save data
}

void readBytes(int device, unsigned int Address, byte len )
{
  byte readBuffer[len];
  Wire.beginTransmission(device); // I2C address
  Wire.write(Address >> 8); // bit shift for high byte of pointer address
  Wire.write(Address & 0xFF); // mask for the low byte
  Wire.endTransmission();
  Wire.requestFrom(device, len);
  Wire.readBytes(readBuffer, len);
  for (byte j = 0; j < 16; j++)
  {
    Serial.print(readBuffer[j], HEX);
    Serial.print(" ");
  }
  Serial.println();
}

OUTPUT

FF 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 FF 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 FF 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 FF 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 FF 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 FF 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 FF 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 FF 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 FF 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 FF 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 FF 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 FF 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 FF 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 FF 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 FF 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 FF 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 FF 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 FF 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 FF 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 FF 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 FF 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 FF 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 FF 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 FF 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 FF 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 FF 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 FF 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 FF 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 FF 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 FF 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
FF 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 FF 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 FF 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 FF 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 FF 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 FF 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 FF 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 FF 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 FF 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 FF 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 FF 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 FF 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 FF 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 FF 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 FF 0