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7 | jlesech | 1 | /**************************************************************************//** |
9 | jlesech | 2 | * \brief EEPROM 24C128 / 24C256 library for Arduino |
7 | jlesech | 3 | * \author Copyright (C) 2012 Julien Le Sech - www.idreammicro.com |
4 | * \version 1.0 |
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5 | * \date 20120203 |
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6 | * |
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9 | jlesech | 7 | * This file is part of the EEPROM 24C128 / 24C256 library for Arduino. |
7 | jlesech | 8 | * |
9 | * This library is free software: you can redistribute it and/or modify it under |
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10 | * the terms of the GNU Lesser General Public License as published by the Free |
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11 | * Software Foundation, either version 3 of the License, or (at your option) any |
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12 | * later version. |
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13 | * |
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14 | * This library is distributed in the hope that it will be useful, but WITHOUT |
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15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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16 | * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more |
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17 | * details. |
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18 | * |
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19 | * You should have received a copy of the GNU Lesser General Public License |
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20 | * along with this program. If not, see http://www.gnu.org/licenses/ |
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21 | ******************************************************************************/ |
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22 | |||
23 | /**************************************************************************//** |
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9 | jlesech | 24 | * \file Eeprom24C128_256.cpp |
7 | jlesech | 25 | ******************************************************************************/ |
26 | |||
27 | /****************************************************************************** |
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28 | * Header file inclusions. |
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29 | ******************************************************************************/ |
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30 | |||
31 | #include <Arduino.h> |
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32 | #include <Wire.h> |
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33 | |||
9 | jlesech | 34 | #include <Eeprom24C128_256.h> |
7 | jlesech | 35 | |
36 | /****************************************************************************** |
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37 | * Private macro definitions. |
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38 | ******************************************************************************/ |
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39 | |||
40 | /**************************************************************************//** |
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9 | jlesech | 41 | * \def EEPROM__PAGE_SIZE |
7 | jlesech | 42 | * \brief Size of a page in EEPROM memory. |
43 | * This size is given by EEPROM memory datasheet. |
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44 | ******************************************************************************/ |
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9 | jlesech | 45 | #define EEPROM__PAGE_SIZE 64 |
7 | jlesech | 46 | |
47 | /**************************************************************************//** |
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9 | jlesech | 48 | * \def EEPROM__RD_BUFFER_SIZE |
7 | jlesech | 49 | * \brief Size of input TWI buffer. |
50 | * This size is equal to BUFFER_LENGTH defined in Wire library (32 bytes). |
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51 | ******************************************************************************/ |
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9 | jlesech | 52 | #define EEPROM__RD_BUFFER_SIZE BUFFER_LENGTH |
7 | jlesech | 53 | |
54 | /**************************************************************************//** |
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9 | jlesech | 55 | * \def EEPROM__WR_BUFFER_SIZE |
7 | jlesech | 56 | * \brief Size of output TWI buffer. |
57 | * This size is equal to BUFFER_LENGTH - 2 bytes reserved for address. |
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58 | ******************************************************************************/ |
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9 | jlesech | 59 | #define EEPROM__WR_BUFFER_SIZE (BUFFER_LENGTH - 2) |
7 | jlesech | 60 | |
61 | /****************************************************************************** |
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62 | * Public method definitions. |
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63 | ******************************************************************************/ |
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64 | |||
65 | /**************************************************************************//** |
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9 | jlesech | 66 | * \fn Eeprom24C128_256::Eeprom24C128_256(byte deviceAddress) |
7 | jlesech | 67 | * |
68 | * \brief Constructor. |
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69 | * |
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70 | * \param deviceAddress EEPROM address on TWI bus. |
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71 | ******************************************************************************/ |
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9 | jlesech | 72 | Eeprom24C128_256::Eeprom24C128_256 |
7 | jlesech | 73 | ( |
74 | byte deviceAddress |
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75 | ){ |
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76 | m_deviceAddress = deviceAddress; |
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77 | } |
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78 | |||
79 | /**************************************************************************//** |
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9 | jlesech | 80 | * \fn void Eeprom24C128_256::initialize() |
7 | jlesech | 81 | * |
82 | * \brief Initialize library and TWI bus. |
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83 | * |
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84 | * If several devices are connected to TWI bus, this method mustn't be |
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85 | * called. TWI bus must be initialized out of this library using |
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86 | * Wire.begin() method. |
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87 | ******************************************************************************/ |
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88 | void |
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9 | jlesech | 89 | Eeprom24C128_256::initialize() |
7 | jlesech | 90 | { |
91 | Wire.begin(); |
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92 | } |
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93 | |||
94 | /**************************************************************************//** |
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9 | jlesech | 95 | * \fn void Eeprom24C128_256::writeByte( |
7 | jlesech | 96 | * word address, |
97 | * byte data) |
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98 | * |
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99 | * \brief Write a byte in EEPROM memory. |
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100 | * |
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101 | * \remarks A delay of 10 ms is required after write cycle. |
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102 | * |
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103 | * \param address Address. |
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104 | * \param data Byte to write. |
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105 | ******************************************************************************/ |
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106 | void |
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9 | jlesech | 107 | Eeprom24C128_256::writeByte |
7 | jlesech | 108 | ( |
109 | word address, |
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110 | byte data |
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111 | ){ |
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112 | Wire.beginTransmission(m_deviceAddress); |
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113 | Wire.write(address >> 8); |
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114 | Wire.write(address & 0xFF); |
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115 | Wire.write(data); |
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116 | Wire.endTransmission(); |
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117 | } |
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118 | |||
119 | /**************************************************************************//** |
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9 | jlesech | 120 | * \fn void Eeprom24C128_256::writeBytes( |
7 | jlesech | 121 | * word address, |
122 | * word length, |
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123 | * byte* p_data) |
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124 | * |
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125 | * \brief Write bytes in EEPROM memory. |
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126 | * |
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127 | * \param address Start address. |
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128 | * \param length Number of bytes to write. |
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129 | * \param[in] p_data Bytes to write. |
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130 | ******************************************************************************/ |
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131 | void |
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9 | jlesech | 132 | Eeprom24C128_256::writeBytes |
7 | jlesech | 133 | ( |
134 | word address, |
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135 | word length, |
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136 | byte* p_data |
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137 | ){ |
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138 | // Write first page if not aligned. |
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139 | byte notAlignedLength = 0; |
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19 | jlesech | 140 | byte pageOffset = address % EEPROM__PAGE_SIZE; |
7 | jlesech | 141 | if (pageOffset > 0) |
142 | { |
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9 | jlesech | 143 | notAlignedLength = EEPROM__PAGE_SIZE - pageOffset; |
7 | jlesech | 144 | writePage(address, notAlignedLength, p_data); |
145 | length -= notAlignedLength; |
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146 | } |
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147 | |||
148 | if (length > 0) |
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149 | { |
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150 | address += notAlignedLength; |
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151 | p_data += notAlignedLength; |
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152 | |||
153 | // Write complete and aligned pages. |
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9 | jlesech | 154 | word pageCount = length / EEPROM__PAGE_SIZE; |
7 | jlesech | 155 | for (word i = 0; i < pageCount; i++) |
156 | { |
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9 | jlesech | 157 | writePage(address, EEPROM__PAGE_SIZE, p_data); |
158 | address += EEPROM__PAGE_SIZE; |
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159 | p_data += EEPROM__PAGE_SIZE; |
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160 | length -= EEPROM__PAGE_SIZE; |
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7 | jlesech | 161 | } |
162 | |||
163 | if (length > 0) |
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164 | { |
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165 | // Write remaining uncomplete page. |
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9 | jlesech | 166 | writePage(address, EEPROM__PAGE_SIZE, p_data); |
7 | jlesech | 167 | } |
168 | } |
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169 | } |
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170 | |||
171 | /**************************************************************************//** |
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9 | jlesech | 172 | * \fn byte Eeprom24C128_256::readByte(word address) |
7 | jlesech | 173 | * |
174 | * \brief Read a byte in EEPROM memory. |
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175 | * |
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176 | * \param address Address. |
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177 | * |
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178 | * \return Read byte. |
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179 | ******************************************************************************/ |
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180 | byte |
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9 | jlesech | 181 | Eeprom24C128_256::readByte |
7 | jlesech | 182 | ( |
183 | word address |
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184 | ){ |
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185 | Wire.beginTransmission(m_deviceAddress); |
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186 | Wire.write(address >> 8); |
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187 | Wire.write(address & 0xFF); |
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188 | Wire.endTransmission(); |
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8 | jlesech | 189 | Wire.requestFrom(m_deviceAddress, (byte)1); |
7 | jlesech | 190 | byte data = 0; |
191 | if (Wire.available()) |
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192 | { |
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193 | data = Wire.read(); |
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194 | } |
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195 | return data; |
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196 | } |
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197 | |||
198 | /**************************************************************************//** |
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9 | jlesech | 199 | * \fn void Eeprom24C128_256::readBytes( |
7 | jlesech | 200 | * word address, |
201 | * word length, |
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202 | * byte* p_data) |
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203 | * |
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204 | * \brief Read bytes in EEPROM memory. |
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205 | * |
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206 | * \param address Start address. |
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207 | * \param length Number of bytes to read. |
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208 | * \patam[in] p_data Byte array to fill with read bytes. |
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209 | ******************************************************************************/ |
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210 | void |
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9 | jlesech | 211 | Eeprom24C128_256::readBytes |
7 | jlesech | 212 | ( |
213 | word address, |
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214 | word length, |
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215 | byte* p_data |
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216 | ){ |
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9 | jlesech | 217 | byte bufferCount = length / EEPROM__RD_BUFFER_SIZE; |
7 | jlesech | 218 | for (byte i = 0; i < bufferCount; i++) |
219 | { |
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9 | jlesech | 220 | word offset = i * EEPROM__RD_BUFFER_SIZE; |
221 | readBuffer(address + offset, EEPROM__RD_BUFFER_SIZE, p_data + offset); |
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7 | jlesech | 222 | } |
223 | |||
9 | jlesech | 224 | byte remainingBytes = length % EEPROM__RD_BUFFER_SIZE; |
7 | jlesech | 225 | word offset = length - remainingBytes; |
226 | readBuffer(address + offset, remainingBytes, p_data + offset); |
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227 | } |
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228 | |||
229 | /****************************************************************************** |
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230 | * Private method definitions. |
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231 | ******************************************************************************/ |
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232 | |||
233 | /**************************************************************************//** |
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9 | jlesech | 234 | * \fn void Eeprom24C128_256::writePage( |
7 | jlesech | 235 | * word address, |
236 | * byte length, |
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237 | * byte* p_data) |
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238 | * |
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239 | * \brief Write page in EEPROM memory. |
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240 | * |
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241 | * \param address Start address. |
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9 | jlesech | 242 | * \param length Number of bytes (EEPROM__PAGE_SIZE bytes max). |
7 | jlesech | 243 | * \param[in] p_data Data. |
244 | ******************************************************************************/ |
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245 | void |
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9 | jlesech | 246 | Eeprom24C128_256::writePage |
7 | jlesech | 247 | ( |
248 | word address, |
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249 | byte length, |
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250 | byte* p_data |
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251 | ){ |
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252 | // Write complete buffers. |
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9 | jlesech | 253 | byte bufferCount = length / EEPROM__WR_BUFFER_SIZE; |
7 | jlesech | 254 | for (byte i = 0; i < bufferCount; i++) |
255 | { |
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19 | jlesech | 256 | byte offset = i * EEPROM__WR_BUFFER_SIZE; |
9 | jlesech | 257 | writeBuffer(address + offset, EEPROM__WR_BUFFER_SIZE, p_data + offset); |
7 | jlesech | 258 | } |
259 | |||
260 | // Write remaining bytes. |
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9 | jlesech | 261 | byte remainingBytes = length % EEPROM__WR_BUFFER_SIZE; |
19 | jlesech | 262 | byte offset = length - remainingBytes; |
7 | jlesech | 263 | writeBuffer(address + offset, remainingBytes, p_data + offset); |
264 | } |
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265 | |||
266 | /**************************************************************************//** |
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9 | jlesech | 267 | * \fn void Eeprom24C128_256::writeBuffer( |
7 | jlesech | 268 | * word address, |
269 | * byte length, |
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270 | * byte* p_data) |
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271 | * |
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272 | * \brief Write bytes into memory. |
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273 | * |
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274 | * \param address Start address. |
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9 | jlesech | 275 | * \param length Number of bytes (EEPROM__WR_BUFFER_SIZE bytes max). |
7 | jlesech | 276 | * \param[in] p_data Data. |
277 | ******************************************************************************/ |
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278 | void |
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9 | jlesech | 279 | Eeprom24C128_256::writeBuffer |
7 | jlesech | 280 | ( |
281 | word address, |
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282 | byte length, |
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283 | byte* p_data |
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284 | ){ |
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285 | Wire.beginTransmission(m_deviceAddress); |
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286 | Wire.write(address >> 8); |
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287 | Wire.write(address & 0xFF); |
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288 | for (byte i = 0; i < length; i++) |
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289 | { |
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290 | Wire.write(p_data[i]); |
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291 | } |
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292 | Wire.endTransmission(); |
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293 | |||
294 | // Write cycle time (tWR). See EEPROM memory datasheet for more details. |
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295 | delay(10); |
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296 | } |
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297 | |||
298 | /**************************************************************************//** |
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9 | jlesech | 299 | * \fn void Eeprom24C128_256::readBuffer( |
7 | jlesech | 300 | * word address, |
301 | * byte length, |
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302 | * byte* p_data) |
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303 | * |
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304 | * \brief Read bytes in memory. |
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305 | * |
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306 | * \param address Start address. |
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9 | jlesech | 307 | * \param length Number of bytes (EEPROM__RD_BUFFER_SIZE bytes max). |
7 | jlesech | 308 | * \param[in] p_data Buffer to fill with read bytes. |
309 | ******************************************************************************/ |
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310 | void |
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9 | jlesech | 311 | Eeprom24C128_256::readBuffer |
7 | jlesech | 312 | ( |
313 | word address, |
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314 | byte length, |
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315 | byte* p_data |
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316 | ){ |
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317 | Wire.beginTransmission(m_deviceAddress); |
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318 | Wire.write(address >> 8); |
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319 | Wire.write(address & 0xFF); |
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320 | Wire.endTransmission(); |
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321 | Wire.requestFrom(m_deviceAddress, length); |
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322 | for (byte i = 0; i < length; i++) |
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323 | { |
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324 | if (Wire.available()) |
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325 | { |
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326 | p_data[i] = Wire.read(); |
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327 | } |
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328 | } |
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329 | } |