wordclock/libraries/AT23C32/AT24C32.cpp

#include <Arduino.h>

#include <Wire.h>

#include <AT24C32.h>

void AT24C32::begin()
{
  Wire.begin();
};

uint8_t AT24C32::read(int address)
{
  uint8_t result = 0;
  bool read = true;
  Wire.beginTransmission(AT24C32_I2C_ADDRESS);
  if (Wire.endTransmission() == 0)
  {
    Wire.beginTransmission(AT24C32_I2C_ADDRESS);
    Wire.write(address >> 8);
    Wire.write(address & 0xff);
    if (Wire.endTransmission() == 0)
    {
      Wire.requestFrom(AT24C32_I2C_ADDRESS, 1);
      while (Wire.available() > 0 && read)
      {
        result = Wire.read();
        read = false;
      }

      Wire.endTransmission();
    }
  }
  return result;
}

void AT24C32::write(int address, uint8_t data)
{
  Wire.beginTransmission(AT24C32_I2C_ADDRESS);
  if (Wire.endTransmission() == 0)
  {
    Wire.beginTransmission(AT24C32_I2C_ADDRESS);
    Wire.write(address >> 8);
    Wire.write(address & 0xff);
    Wire.write(data);
    Wire.endTransmission();
    delay(20);
  }
}