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50 | jlesech | 1 | /**************************************************************************//** |
2 | * \brief EEPROM 24C128/24C256 library. |
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3 | * \author Copyright (C) 2012 Julien Le Sech - www.idreammicro.com |
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4 | * \version 1.0 |
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5 | * \date 20121102 |
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6 | * |
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7 | * This file is part of the iDreamMicro library. |
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8 | * |
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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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24 | * \file eeprom_24c128_24c256.c |
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25 | ******************************************************************************/ |
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26 | |||
27 | /****************************************************************************** |
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28 | * Header file inclusions. |
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29 | ******************************************************************************/ |
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30 | |||
31 | #include "../eeprom_24c128_24c256.h" |
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32 | |||
33 | #include <twi/twi.h> |
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34 | |||
35 | #include <util/delay.h> |
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36 | |||
37 | #include <assert.h> |
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38 | #include <stdint.h> |
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39 | #include <stdlib.h> |
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40 | |||
41 | /****************************************************************************** |
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42 | * Private macro definitions. |
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43 | ******************************************************************************/ |
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44 | |||
45 | /**************************************************************************//** |
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46 | * \def EEPROM_24C128_24C256__ADDRESS |
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47 | * \brief EEPROM 24C128/24C256 address. Given by datasheet. |
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48 | ******************************************************************************/ |
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49 | #define EEPROM_24C128_24C256__ADDRESS 0xA0 |
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50 | |||
51 | /**************************************************************************//** |
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52 | * \def EEPROM_24C128_24C256__PAGE_SIZE |
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53 | * \brief Size of a page in EEPROM memory. |
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54 | * This size is given by EEPROM memory datasheet. |
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55 | ******************************************************************************/ |
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56 | #define EEPROM_24C128_24C256__PAGE_SIZE 64 |
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57 | |||
58 | /****************************************************************************** |
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59 | * Private function prototypes. |
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60 | ******************************************************************************/ |
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61 | |||
62 | /**************************************************************************//** |
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63 | * \fn static void eeprom_24c128_24c256__write_page( |
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64 | * uint16_t address, |
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65 | * uint8_t length, |
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66 | * uint8_t* p_data) |
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67 | * |
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68 | * \brief Write a page in memory. |
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69 | * |
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70 | * \param address Start address of data to write. |
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71 | * \param length Number of bytes to write. |
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72 | * \param[in] p_data Bytes to write. |
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73 | ******************************************************************************/ |
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74 | static |
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75 | void |
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76 | eeprom_24c128_24c256__write_page |
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77 | ( |
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78 | uint16_t address, |
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79 | uint8_t length, |
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80 | uint8_t* p_data |
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81 | ); |
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82 | |||
83 | /****************************************************************************** |
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84 | * Private variable declarations. |
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85 | ******************************************************************************/ |
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86 | |||
87 | static uint8_t device_address = 0; |
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88 | |||
89 | /****************************************************************************** |
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90 | * Public function definitions. |
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91 | ******************************************************************************/ |
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92 | |||
93 | /**************************************************************************//** |
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94 | * \fn void eeprom_24c128_24c256__initialize(uint8_t hardware_address) |
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95 | * |
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96 | * \brief Initialize EEPROM 24C128/24C256. |
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97 | * |
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98 | * \param hardware_address Hardware address. Pins A0 to A2. |
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99 | ******************************************************************************/ |
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100 | void |
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101 | eeprom_24c128_24c256__initialize |
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102 | ( |
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103 | uint8_t hardware_address |
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104 | ){ |
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105 | // Compute device address. |
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106 | device_address = EEPROM_24C128_24C256__ADDRESS | ((hardware_address & 0x07) << 1); |
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107 | |||
108 | // We don't initialize TWI here: we may have several devices on the bus. |
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109 | // Initialize TWI. |
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110 | //twi__initialize(EEPROM_24C128_24C256__CLOCK_RATE); |
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111 | } |
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112 | |||
113 | /**************************************************************************//** |
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114 | * \fn void eeprom_24c128_24c256__write_byte(uint16_t address, uint8_t data) |
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115 | * |
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116 | * \brief Write a byte into memory. |
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117 | * |
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118 | * \param address Address in memory. |
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119 | * \param data Byte to write. |
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120 | ******************************************************************************/ |
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121 | void |
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122 | eeprom_24c128_24c256__write_byte |
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123 | ( |
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124 | uint16_t address, |
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125 | uint8_t data |
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126 | ){ |
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127 | twi__start(); |
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128 | twi__send_slaw(device_address); |
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129 | twi__send_data(address >> 8); |
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130 | twi__send_data(address & 0xFF); |
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131 | twi__send_data(data); |
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132 | twi__stop(); |
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133 | } |
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134 | |||
135 | /**************************************************************************//** |
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136 | * \fn void eeprom_24c128_24c256__write_bytes( |
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137 | * uint16_t address, |
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138 | * uint16_t length, |
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139 | * uint8_t* p_data) |
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140 | * |
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141 | * \brief Write bytes into memory. |
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142 | * |
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143 | * \param address Start address. |
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144 | * \param length Number of bytes to write. |
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145 | * \param[in] p_data Bytes to write. |
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146 | ******************************************************************************/ |
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147 | void |
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148 | eeprom_24c128_24c256__write_bytes |
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149 | ( |
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150 | uint16_t address, |
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151 | uint16_t length, |
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152 | uint8_t* p_data |
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153 | ){ |
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154 | // Check the preconditions. |
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155 | assert(NULL != p_data); |
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156 | |||
157 | // Write first page if not aligned. |
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158 | uint8_t not_aligned_length = 0; |
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159 | uint8_t page_offset = address % EEPROM_24C128_24C256__PAGE_SIZE; |
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160 | if (page_offset > 0) |
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161 | { |
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162 | not_aligned_length = EEPROM_24C128_24C256__PAGE_SIZE - page_offset; |
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163 | eeprom_24c128_24c256__write_page(address, not_aligned_length, p_data); |
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164 | length -= not_aligned_length; |
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165 | } |
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166 | |||
167 | if (length > 0) |
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168 | { |
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169 | address += not_aligned_length; |
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170 | p_data += not_aligned_length; |
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171 | |||
172 | // Write complete and aligned pages. |
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173 | uint16_t page_count = length / EEPROM_24C128_24C256__PAGE_SIZE; |
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174 | for (uint16_t i = 0; i < page_count; i++) |
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175 | { |
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176 | eeprom_24c128_24c256__write_page(address, EEPROM_24C128_24C256__PAGE_SIZE, p_data); |
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177 | address += EEPROM_24C128_24C256__PAGE_SIZE; |
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178 | p_data += EEPROM_24C128_24C256__PAGE_SIZE; |
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179 | length -= EEPROM_24C128_24C256__PAGE_SIZE; |
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180 | } |
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181 | |||
182 | if (length > 0) |
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183 | { |
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184 | // Write remaining uncomplete page. |
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185 | eeprom_24c128_24c256__write_page(address, EEPROM_24C128_24C256__PAGE_SIZE, p_data); |
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186 | } |
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187 | } |
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188 | } |
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189 | |||
190 | /**************************************************************************//** |
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191 | * \fn uint8_t eeprom_24c128_24c256__read_byte(uint16_t address) |
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192 | * |
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193 | * \brief Read a byte in memory. |
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194 | * |
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195 | * \param address Address to read. |
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196 | * |
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197 | * \return Read byte. |
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198 | ******************************************************************************/ |
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199 | uint8_t |
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200 | eeprom_24c128_24c256__read_byte |
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201 | ( |
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202 | uint16_t address |
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203 | ){ |
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204 | uint8_t data = 0; |
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205 | |||
206 | twi__start(); |
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207 | twi__send_slaw(device_address); |
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208 | twi__send_data(address >> 8); |
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209 | twi__send_data(address & 0xFF); |
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210 | twi__repeat_start(); |
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211 | twi__send_slar(device_address); |
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212 | twi__receive_data_nack(&data); |
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213 | twi__stop(); |
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214 | |||
215 | return data; |
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216 | } |
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217 | |||
218 | /**************************************************************************//** |
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219 | * \fn void eeprom_24c128_24c256__read_bytes( |
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220 | * uint16_t address, |
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221 | * uint16_t length, |
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222 | * uint8_t* p_data) |
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223 | * |
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224 | * \brief Read bytes in memory. |
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225 | * |
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226 | * \param address Start address of data to read. |
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227 | * \param length Number of bytes to read. |
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228 | * \param[in] p_data Buffer to fill with read bytes. |
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229 | ******************************************************************************/ |
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230 | void |
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231 | eeprom_24c128_24c256__read_bytes |
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232 | ( |
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233 | uint16_t address, |
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234 | uint16_t length, |
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235 | uint8_t* p_data |
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236 | ){ |
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237 | // Check the preconditions. |
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238 | assert(NULL != p_data); |
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239 | |||
240 | twi__start(); |
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241 | twi__send_slaw(device_address); |
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242 | twi__send_data(address >> 8); |
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243 | twi__send_data(address & 0xFF); |
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244 | twi__repeat_start(); |
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245 | twi__send_slar(device_address); |
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246 | for (uint16_t i = 0; i < length - 1; i++) |
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247 | { |
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248 | twi__receive_data_ack(p_data + i); |
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249 | } |
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250 | twi__receive_data_nack(p_data + length - 1); |
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251 | twi__stop(); |
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252 | } |
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253 | |||
254 | /****************************************************************************** |
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255 | * Private function definitions. |
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256 | ******************************************************************************/ |
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257 | |||
258 | /**************************************************************************//** |
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259 | * \fn static void eeprom_24c128_24c256__write_page( |
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260 | * uint16_t address, |
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261 | * uint8_t length, |
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262 | * uint8_t* p_data) |
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263 | * |
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264 | * \brief Write a page in memory. |
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265 | * |
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266 | * \param address Start address of data to write. |
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267 | * \param length Number of bytes to write. |
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268 | * \param[in] p_data Bytes to write. |
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269 | ******************************************************************************/ |
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270 | static |
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271 | void |
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272 | eeprom_24c128_24c256__write_page |
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273 | ( |
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274 | uint16_t address, |
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275 | uint8_t length, |
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276 | uint8_t* p_data |
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277 | ){ |
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278 | // Check the preconditions. |
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279 | assert(NULL != p_data); |
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280 | |||
281 | twi__start(); |
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282 | twi__send_slaw(device_address); |
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283 | twi__send_data(address >> 8); |
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284 | twi__send_data(address & 0xFF); |
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285 | for (uint8_t i = 0; i < length; i++) |
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286 | { |
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287 | twi__send_data(p_data[i]); |
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288 | } |
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289 | twi__stop(); |
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290 | |||
291 | // Write cycle time (tWR). See EEPROM memory datasheet for more details. |
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292 | _delay_ms(10); |
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293 | } |