mirror of https://github.com/arendst/Tasmota.git
335 lines
10 KiB
C++
335 lines
10 KiB
C++
/**************************************************************************//**
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* \brief EEPROM 24C512 library for Arduino
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* \author Copyright (C) 2012 Julien Le Sech - www.idreammicro.com
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* \version 1.0
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* \date 20120218
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*
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* This file is part of the EEPROM 24C512 library for Arduino.
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*
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* This library is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any
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* later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see http://www.gnu.org/licenses/
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******************************************************************************/
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/**************************************************************************//**
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* \file Eeprom24C512.cpp
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******************************************************************************/
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/******************************************************************************
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* Header file inclusions.
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******************************************************************************/
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#include <Arduino.h>
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#include <Wire.h>
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#include <Eeprom24C512.h>
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/******************************************************************************
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* Private macro definitions.
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******************************************************************************/
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/**************************************************************************//**
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* \def EEPROM__PAGE_SIZE
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* \brief Size of a page in EEPROM memory.
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* This size is given by EEPROM memory datasheet.
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******************************************************************************/
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#define EEPROM__PAGE_SIZE 128
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/**************************************************************************//**
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* \def EEPROM__RD_BUFFER_SIZE
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* \brief Size of input TWI buffer.
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* This size is equal to BUFFER_LENGTH defined in Wire library (32 bytes).
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******************************************************************************/
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#define EEPROM__RD_BUFFER_SIZE BUFFER_LENGTH
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/**************************************************************************//**
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* \def EEPROM__WR_BUFFER_SIZE
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* \brief Size of output TWI buffer.
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* This size is equal to BUFFER_LENGTH - 2 bytes reserved for address.
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******************************************************************************/
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#define EEPROM__WR_BUFFER_SIZE (BUFFER_LENGTH - 2)
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/******************************************************************************
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* Public method definitions.
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******************************************************************************/
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/**************************************************************************//**
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* \fn Eeprom24C512::Eeprom24C512(byte deviceAddress)
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*
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* \brief Constructor.
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*
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* \param deviceAddress EEPROM address on TWI bus.
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******************************************************************************/
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Eeprom24C512::Eeprom24C512
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(
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byte deviceAddress
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){
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m_deviceAddress = deviceAddress;
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}
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/**************************************************************************//**
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* \fn void Eeprom24C512::initialize()
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*
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* \brief Initialize library and TWI bus.
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*
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* If several devices are connected to TWI bus, this method mustn't be
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* called. TWI bus must be initialized out of this library using
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* Wire.begin() method.
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******************************************************************************/
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void
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Eeprom24C512::initialize()
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{
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Wire.begin();
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}
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/**************************************************************************//**
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* \fn void Eeprom24C512::writeByte(
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* word address,
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* byte data)
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*
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* \brief Write a byte in EEPROM memory.
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*
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* \remarks A delay of 10 ms is required after write cycle.
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*
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* \param address Address.
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* \param data Byte to write.
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******************************************************************************/
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void
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Eeprom24C512::writeByte
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(
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word address,
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byte data
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){
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Wire.beginTransmission(m_deviceAddress);
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Wire.write(address >> 8);
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Wire.write(address & 0xFF);
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Wire.write(data);
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Wire.endTransmission();
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}
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/**************************************************************************//**
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* \fn void Eeprom24C512::writeBytes(
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* word address,
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* word length,
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* byte* p_data)
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*
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* \brief Write bytes in EEPROM memory.
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*
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* \param address Start address.
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* \param length Number of bytes to write.
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* \param[in] p_data Bytes to write.
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******************************************************************************/
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void
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Eeprom24C512::writeBytes
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(
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word address,
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word length,
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byte* p_data
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){
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// Write first page if not aligned.
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byte notAlignedLength = 0;
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byte pageOffset = address % EEPROM__PAGE_SIZE;
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if (pageOffset > 0)
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{
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notAlignedLength = EEPROM__PAGE_SIZE - pageOffset;
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if (length < notAlignedLength)
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{
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notAlignedLength = length;
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}
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writePage(address, notAlignedLength, p_data);
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length -= notAlignedLength;
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}
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if (length > 0)
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{
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address += notAlignedLength;
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p_data += notAlignedLength;
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// Write complete and aligned pages.
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word pageCount = length / EEPROM__PAGE_SIZE;
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for (word i = 0; i < pageCount; i++)
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{
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writePage(address, EEPROM__PAGE_SIZE, p_data);
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address += EEPROM__PAGE_SIZE;
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p_data += EEPROM__PAGE_SIZE;
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length -= EEPROM__PAGE_SIZE;
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}
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if (length > 0)
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{
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// Write remaining uncomplete page.
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writePage(address, length, p_data);
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}
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}
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}
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/**************************************************************************//**
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* \fn byte Eeprom24C512::readByte(word address)
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*
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* \brief Read a byte in EEPROM memory.
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*
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* \param address Address.
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*
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* \return Read byte.
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******************************************************************************/
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byte
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Eeprom24C512::readByte
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(
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word address
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){
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Wire.beginTransmission(m_deviceAddress);
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Wire.write(address >> 8);
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Wire.write(address & 0xFF);
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Wire.endTransmission();
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Wire.requestFrom(m_deviceAddress, (byte)1);
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byte data = 0;
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if (Wire.available())
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{
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data = Wire.read();
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}
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return data;
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}
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/**************************************************************************//**
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* \fn void Eeprom24C512::readBytes(
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* word address,
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* word length,
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* byte* p_data)
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*
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* \brief Read bytes in EEPROM memory.
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*
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* \param address Start address.
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* \param length Number of bytes to read.
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* \patam[in] p_data Byte array to fill with read bytes.
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******************************************************************************/
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void
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Eeprom24C512::readBytes
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(
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word address,
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word length,
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byte* p_data
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){
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word bufferCount = length / EEPROM__RD_BUFFER_SIZE;
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for (word i = 0; i < bufferCount; i++)
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{
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word offset = i * EEPROM__RD_BUFFER_SIZE;
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readBuffer(address + offset, EEPROM__RD_BUFFER_SIZE, p_data + offset);
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}
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byte remainingBytes = length % EEPROM__RD_BUFFER_SIZE;
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word offset = length - remainingBytes;
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readBuffer(address + offset, remainingBytes, p_data + offset);
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}
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/******************************************************************************
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* Private method definitions.
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******************************************************************************/
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/**************************************************************************//**
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* \fn void Eeprom24C512::writePage(
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* word address,
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* byte length,
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* byte* p_data)
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*
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* \brief Write page in EEPROM memory.
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*
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* \param address Start address.
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* \param length Number of bytes (EEPROM__PAGE_SIZE bytes max).
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* \param[in] p_data Data.
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******************************************************************************/
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void
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Eeprom24C512::writePage
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(
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word address,
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byte length,
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byte* p_data
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){
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// Write complete buffers.
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byte bufferCount = length / EEPROM__WR_BUFFER_SIZE;
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for (byte i = 0; i < bufferCount; i++)
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{
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byte offset = i * EEPROM__WR_BUFFER_SIZE;
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writeBuffer(address + offset, EEPROM__WR_BUFFER_SIZE, p_data + offset);
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}
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// Write remaining bytes.
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byte remainingBytes = length % EEPROM__WR_BUFFER_SIZE;
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byte offset = length - remainingBytes;
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writeBuffer(address + offset, remainingBytes, p_data + offset);
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}
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/**************************************************************************//**
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* \fn void Eeprom24C512::writeBuffer(
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* word address,
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* byte length,
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* byte* p_data)
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*
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* \brief Write bytes into memory.
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*
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* \param address Start address.
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* \param length Number of bytes (EEPROM__WR_BUFFER_SIZE bytes max).
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* \param[in] p_data Data.
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******************************************************************************/
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void
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Eeprom24C512::writeBuffer
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(
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word address,
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byte length,
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byte* p_data
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){
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Wire.beginTransmission(m_deviceAddress);
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Wire.write(address >> 8);
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Wire.write(address & 0xFF);
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for (byte i = 0; i < length; i++)
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{
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Wire.write(p_data[i]);
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}
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Wire.endTransmission();
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// Write cycle time (tWR). See EEPROM memory datasheet for more details.
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delay(10);
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}
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/**************************************************************************//**
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* \fn void Eeprom24C512::readBuffer(
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* word address,
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* byte length,
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* byte* p_data)
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*
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* \brief Read bytes in memory.
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*
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* \param address Start address.
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* \param length Number of bytes (EEPROM__RD_BUFFER_SIZE bytes max).
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* \param[in] p_data Buffer to fill with read bytes.
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******************************************************************************/
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void
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Eeprom24C512::readBuffer
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(
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word address,
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byte length,
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byte* p_data
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){
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Wire.beginTransmission(m_deviceAddress);
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Wire.write(address >> 8);
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Wire.write(address & 0xFF);
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Wire.endTransmission();
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Wire.requestFrom(m_deviceAddress, length);
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for (byte i = 0; i < length; i++)
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{
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if (Wire.available())
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{
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p_data[i] = Wire.read();
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}
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}
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}
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