I2CEeprom.h

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// Copyright (C) 2016 Krister W. <[email protected]>
//
// Original SPI flash driver this is based on:
// Copyright (c) 2013-2015 by Felix Rusu, LowPowerLab.com
//
// I2C EEPROM library for MySensors OTA. Based on SPI Flash memory library for
// arduino/moteino.
// This driver is made to look like the SPI flash driver so changes needed to
// MySensors OTA code is minimized.
// This works with 32 or 64kB I2C EEPROM like an 24(L)C256. AVR HW I2C is assumed
// and error handling is quite minimal. Uses extEEPROM as the underlying driver.
// DEPENDS ON: Arduino Wire library, extEEPROM
// **********************************************************************************
// License
// **********************************************************************************
// This program is free software; you can redistribute it
// and/or modify it under the terms of the GNU General
// Public License as published by the Free Software
// Foundation; either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will
// be useful, but WITHOUT ANY WARRANTY; without even the
// implied warranty of MERCHANTABILITY or FITNESS FOR A
// PARTICULAR PURPOSE. See the GNU General Public
// License for more details.
//
// You should have received a copy of the GNU General
// Public License along with this program.
// If not, see <http://www.gnu.org/licenses/>.
//
// Licence can be viewed at
// http://www.gnu.org/licenses/gpl-3.0.txt
//
// Please maintain this license information along with authorship
// and copyright notices in any redistribution of this code
 
#ifndef _I2CEeprom_H_
#define _I2CEeprom_H_
 
#include <Arduino.h>
#include <extEEPROM.h>
 
// 400kHz clock as default. Use extEEPROM type
#ifndef I2CEEPROM_TWI_CLK
#define I2CEEPROM_TWI_CLK twiClock400kHz
#endif
 
//Typically 64 (see data sheet for your EEPROM)
// Some 512kbit chips use 128 byte pages (e.g. Atmel AT24C512)
#ifndef I2CEEPROM_PAGE_SIZE
#define I2CEEPROM_PAGE_SIZE 64
#endif
 
// 24C256 is 32kB, minimum that fits code for ATmega328
// Use extEEPROM type
#ifndef I2CEEPROM_CHIP_SIZE
#define I2CEEPROM_CHIP_SIZE kbits_256
#endif
 
class I2CEeprom : extEEPROM
{
public:
 
    explicit I2CEeprom(uint8_t addr); 
    bool initialize(); 
    uint8_t readByte(uint32_t addr); 
    void readBytes(uint32_t addr, void* buf, uint16_t len); 
    void writeByte(uint32_t addr, uint8_t byt); 
    void writeBytes(uint32_t addr, const void* buf,
                    uint16_t len); 
    bool busy(); 
 
    // the rest not needed for EEPROMs, but kept so SPI flash code compiles as is (functions are NOP)
 
    uint16_t readDeviceId()
    {
        return 0xDEAD;
    };
    void chipErase() {};
    void blockErase4K(uint32_t address)
    {
        (void)address;
    };
    void blockErase32K(uint32_t address)
    {
        (void)address;
    };
    void sleep() {};
    void wakeup() {};
    void end() {};
 
protected:
 
    uint8_t m_addr; 
};
 
#endif