EEPROM-Code

EEPROM-Code

On the ControllerBoard is an EEPROM from Atmel, the AT24C1024B, with 1MBit of Memory(128KBytes). This chip can be accessed with i2c, a 2-Wire chip protocol. There is already a library for this chip available: http://www.arduino.cc/playground/Code/I2CEEPROM24C1024

#include <WProgram.h>
#include <Wire.h>          // i2c lib
#include <E24C1024.h>      // eeprom lib

unsigned long errors = 0;
unsigned long address = 0;

// Set to a higher number if you want to start at a higher address.
#define MIN_ADDRESS 0

// Upper boundary of the address space.  Choose one.
#define MAX_ADDRESS 131072 // 1 device
//#define MAX_ADDRESS 262144 // 2 devices
//#define MAX_ADDRESS 393216 // 3 devices
//#define MAX_ADDRESS 524288 // 4 devices

#define TEST_SIZE  16

void setup()
{
  // enable eeprom
  // this has to be set before accessing the eeprom,
  // otherwise the eeprom has no power, check the schematics
  pinMode(23, OUTPUT);     //
  digitalWrite(23, LOW);   // a low on D23 enables the eeprom

  // test the eeprom, write to the eeprom + read out of it
  Serial.begin(9600);
  Serial.println("---------------------------");
  Serial.println("EEPROM Test");
  writeByByteTest();
  readByByteTest();
}

void loop()
{
}

void writeByByteTest()
{
  errors = 0;
  Serial.println("--------------------------------");
  Serial.println("Write to EEPROM:");

  for (address = MIN_ADDRESS; address < TEST_SIZE; address++)
  {
    // write to the eeprom
    EEPROM1024.write(address, (uint8_t)(address));
    Serial.print(".");
  }
  Serial.println();
}

void readByByteTest()
{
  errors = 0;
  Serial.println("--------------------------------");
  Serial.println("Read from EEPROM:");
  uint8_t data;
  for (address = MIN_ADDRESS; address <TEST_SIZE; address++)
  {
    // read out the eeprom data
    data = EEPROM1024.read(address);

    // check for errors
    if (data != (uint8_t)(address))
    {
      Serial.println();
      Serial.print("Address: ");
      Serial.print(address);
      Serial.print(" Should be: ");
      Serial.print((uint8_t)(address), DEC);
      Serial.print(" Read val: ");
      Serial.println(data, DEC);
      errors++;
    }
    else
      Serial.print(".");
  }
  Serial.println();
  Serial.println("Done reading");
  Serial.print("Total errors: ");
  Serial.println(errors);
  Serial.println("--------------------------------");
  Serial.println();
}

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