drivers/eeprom/eeprom.c

   1 /**************************************************************************/
   2 /*!
   3     @file     eeprom.c
   4     @author   K. Townsend (microBuilder.eu)
   5
   6     @section LICENSE
   7
   8     Software License Agreement (BSD License)
   9
  10     Copyright (c) 2010, microBuilder SARL
  11     All rights reserved.
  12
  13     Redistribution and use in source and binary forms, with or without
  14     modification, are permitted provided that the following conditions are met:
  15     1. Redistributions of source code must retain the above copyright
  16     notice, this list of conditions and the following disclaimer.
  17     2. Redistributions in binary form must reproduce the above copyright
  18     notice, this list of conditions and the following disclaimer in the
  19     documentation and/or other materials provided with the distribution.
  20     3. Neither the name of the copyright holders nor the
  21     names of its contributors may be used to endorse or promote products
  22     derived from this software without specific prior written permission.
  23
  24     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
  25     EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  26     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  27     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
  28     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  29     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  30     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  31     ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 */
  35 /**************************************************************************/
  36 #include <string.h>
  37
  38 #include "projectconfig.h"
  39 #include "eeprom.h"
  40
  41 // Currently only the MCP24AA I2C EEPROM is used
  42 #include "drivers/eeprom/mcp24aa/mcp24aa.h"
  43
  44 static uint8_t buf[32];
  45
  46 /**************************************************************************/
  47 /*!
  48     @brief Checks whether the supplied address is within the valid range
  49
  50     @param[in]  addr
  51                 The 16-bit address to check
  52
  53     @return     Zero if the address is valid, otherwise 1
  54 */
  55 /**************************************************************************/
  56 bool eepromCheckAddress(uint16_t addr)
  57 {
  58   // Check for invalid values
  59   return addr <= MCP24AA_MAXADDR ? FALSE : TRUE;
  60 }
  61
  62 /**************************************************************************/
  63 /*!
  64     @brief Reads 1 byte from EEPROM
  65
  66     @param[in]  addr
  67                 The 16-bit address to read from in EEPROM
  68
  69     @return     An unsigned 8-bit value (uint8_t)
  70 */
  71 /**************************************************************************/
  72 uint8_t eepromReadU8(uint16_t addr)
  73 {
  74   mcp24aaError_e error = MCP24AA_ERROR_OK;
  75   error = mcp24aaReadBuffer(addr, buf, sizeof(uint8_t));
  76
  77   // ToDo: Handle any errors
  78   if (error) { };
  79
  80   return buf[0];
  81 }
  82
  83 /**************************************************************************/
  84 /*!
  85     @brief Reads 1 byte from EEPROM
  86
  87     @param[in]  addr
  88                 The 16-bit address to read from in EEPROM
  89
  90     @return     A signed 8-bit value (int8_t)
  91 */
  92 /**************************************************************************/
  93 int8_t eepromReadS8(uint16_t addr)
  94 {
  95   int8_t results;
  96
  97   mcp24aaError_e error = MCP24AA_ERROR_OK;
  98   error = mcp24aaReadBuffer(addr, buf, sizeof(int8_t));
  99
 100   // ToDo: Handle any errors
 101   if (error) { };
 102
 103   memcpy(&results, buf, sizeof(int8_t));
 104   return results;
 105 }
 106
 107 /**************************************************************************/
 108 /*!
 109     @brief Reads 2 bytes from EEPROM
 110
 111     @param[in]  addr
 112                 The 16-bit address to read from in EEPROM
 113
 114     @return     A unsigned 16-bit value (uint16_t)
 115 */
 116 /**************************************************************************/
 117 uint16_t eepromReadU16(uint16_t addr)
 118 {
 119   uint16_t results;
 120
 121   mcp24aaError_e error = MCP24AA_ERROR_OK;
 122   error = mcp24aaReadBuffer(addr, buf, sizeof(uint16_t));
 123
 124   // ToDo: Handle any errors
 125   if (error) { };
 126
 127   memcpy(&results, buf, sizeof(uint16_t));
 128
 129   return results;
 130 }
 131
 132 /**************************************************************************/
 133 /*!
 134     @brief Reads 2 bytes from EEPROM
 135
 136     @param[in]  addr
 137                 The 16-bit address to read from in EEPROM
 138
 139     @return     A signed 16-bit value (int16_t)
 140 */
 141 /**************************************************************************/
 142 int16_t eepromReadS16(uint16_t addr)
 143 {
 144   int16_t results;
 145
 146   mcp24aaError_e error = MCP24AA_ERROR_OK;
 147   error = mcp24aaReadBuffer(addr, buf, sizeof(int16_t));
 148
 149   // ToDo: Handle any errors
 150   if (error) { };
 151
 152   memcpy(&results, buf, sizeof(int16_t));
 153   return results;
 154 }
 155
 156 /**************************************************************************/
 157 /*!
 158     @brief Reads 4 bytes from EEPROM
 159
 160     @param[in]  addr
 161                 The 16-bit address to read from in EEPROM
 162
 163     @return     A unsigned 32-bit value (uint32_t)
 164 */
 165 /**************************************************************************/
 166 uint32_t eepromReadU32(uint16_t addr)
 167 {
 168   uint32_t results;
 169
 170   mcp24aaError_e error = MCP24AA_ERROR_OK;
 171   error = mcp24aaReadBuffer(addr, buf, sizeof(uint32_t));
 172
 173   // ToDo: Handle any errors
 174   if (error) { };
 175
 176   memcpy(&results, buf, sizeof(uint32_t));
 177   return results;
 178 }
 179
 180 /**************************************************************************/
 181 /*!
 182     @brief Reads 4 bytes from EEPROM
 183
 184     @param[in]  addr
 185                 The 16-bit address to read from in EEPROM
 186
 187     @return     A signed 32-bit value (int32_t)
 188 */
 189 /**************************************************************************/
 190 int32_t eepromReadS32(uint16_t addr)
 191 {
 192   int32_t results;
 193
 194   mcp24aaError_e error = MCP24AA_ERROR_OK;
 195   error = mcp24aaReadBuffer(addr, buf, sizeof(int32_t));
 196
 197   // ToDo: Handle any errors
 198   if (error) { };
 199
 200   memcpy(&results, buf, sizeof(int32_t));
 201   return results;
 202 }
 203
 204 /**************************************************************************/
 205 /*!
 206     @brief Reads 8 bytes from EEPROM
 207
 208     @param[in]  addr
 209                 The 16-bit address to read from in EEPROM
 210
 211     @return     A unsigned 64-bit value (uint64_t)
 212 */
 213 /**************************************************************************/
 214 uint64_t eepromReadU64(uint16_t addr)
 215 {
 216   uint64_t results;
 217
 218   mcp24aaError_e error = MCP24AA_ERROR_OK;
 219   error = mcp24aaReadBuffer(addr, buf, sizeof(uint64_t));
 220
 221   // ToDo: Handle any errors
 222   if (error) { };
 223
 224   memcpy(&results, buf, sizeof(uint64_t));
 225   return results;
 226 }
 227
 228 /**************************************************************************/
 229 /*!
 230     @brief Reads 8 bytes from EEPROM
 231
 232     @param[in]  addr
 233                 The 16-bit address to read from in EEPROM
 234
 235     @return     A signed 64-bit value (int64_t)
 236 */
 237 /**************************************************************************/
 238 int64_t eepromReadS64(uint16_t addr)
 239 {
 240   int64_t results;
 241
 242   mcp24aaError_e error = MCP24AA_ERROR_OK;
 243   error = mcp24aaReadBuffer(addr, buf, sizeof(int64_t));
 244
 245   // ToDo: Handle any errors
 246   if (error) { };
 247
 248   memcpy(&results, buf, sizeof(int64_t));
 249   return results;
 250 }
 251
 252 /**************************************************************************/
 253 /*!
 254     @brief Reads a variabls length buffer from EEPROM
 255
 256     @param[in]  addr
 257                 The 16-bit address to write to in EEPROM
 258     @param[out] buffer
 259                 Pointer to the buffer that will store any retrieved bytes
 260     @param[in]  bufferLength
 261                 The number of bytes to read
 262 */
 263 /**************************************************************************/
 264 void eepromReadBuffer(uint16_t addr, uint8_t *buffer, uint32_t bufferLength)
 265 {
 266   // Instantiate error message placeholder
 267   mcp24aaError_e error = MCP24AA_ERROR_OK;
 268
 269   // Read the contents of address
 270   error = mcp24aaReadBuffer(addr, buffer, bufferLength);
 271
 272   // ToDo: Handle any errors
 273   if (error) { };
 274 }
 275
 276 /**************************************************************************/
 277 /*!
 278     @brief Writes 1 byte to EEPROM
 279
 280     @param[in]  addr
 281                 The 16-bit address to write to in EEPROM
 282 */
 283 /**************************************************************************/
 284 void eepromWriteU8(uint16_t addr, uint8_t value)
 285 {
 286   mcp24aaError_e error = MCP24AA_ERROR_OK;
 287   error = mcp24aaWriteBuffer(addr, (uint8_t *)&value, sizeof(value));
 288
 289   // ToDo: Handle any errors
 290   if (error) { };
 291 }
 292
 293 /**************************************************************************/
 294 /*!
 295     @brief Writes 1 signed byte to EEPROM
 296
 297     @param[in]  addr
 298                 The 16-bit address to write to in EEPROM
 299 */
 300 /**************************************************************************/
 301 void eepromWriteS8(uint16_t addr, int8_t value)
 302 {
 303   mcp24aaError_e error = MCP24AA_ERROR_OK;
 304   error = mcp24aaWriteBuffer(addr, (uint8_t *)&value, sizeof(value));
 305
 306   // ToDo: Handle any errors
 307   if (error) { };
 308 }
 309
 310 /**************************************************************************/
 311 /*!
 312     @brief Writes an unsigned 16-bit integer to EEPROM
 313
 314     @param[in]  addr
 315                 The 16-bit address to write to in EEPROM
 316 */
 317 /**************************************************************************/
 318 void eepromWriteU16(uint16_t addr, uint16_t value)
 319 {
 320   mcp24aaError_e error = MCP24AA_ERROR_OK;
 321   error = mcp24aaWriteBuffer(addr, (uint8_t *)&value, sizeof(value));
 322
 323   // ToDo: Handle any errors
 324   if (error) { };
 325 }
 326
 327 /**************************************************************************/
 328 /*!
 329     @brief Writes a signed 16-bit integer to EEPROM
 330
 331     @param[in]  addr
 332                 The 16-bit address to write to in EEPROM
 333 */
 334 /**************************************************************************/
 335 void eepromWriteS16(uint16_t addr, int16_t value)
 336 {
 337   mcp24aaError_e error = MCP24AA_ERROR_OK;
 338   error = mcp24aaWriteBuffer(addr, (uint8_t *)&value, sizeof(value));
 339
 340   // ToDo: Handle any errors
 341   if (error) { };
 342 }
 343
 344 /**************************************************************************/
 345 /*!
 346     @brief Writes an unsigned 32-bit integer to EEPROM
 347
 348     @param[in]  addr
 349                 The 16-bit address to write to in EEPROM
 350 */
 351 /**************************************************************************/
 352 void eepromWriteU32(uint16_t addr, uint32_t value)
 353 {
 354   mcp24aaError_e error = MCP24AA_ERROR_OK;
 355   error = mcp24aaWriteBuffer(addr, (uint8_t *)&value, sizeof(value));
 356
 357   // ToDo: Handle any errors
 358   if (error) { };
 359 }
 360
 361 /**************************************************************************/
 362 /*!
 363     @brief Writes a signed 32-bit integer to EEPROM
 364
 365     @param[in]  addr
 366                 The 16-bit address to write to in EEPROM
 367 */
 368 /**************************************************************************/
 369 void eepromWriteS32(uint16_t addr, int32_t value)
 370 {
 371   mcp24aaError_e error = MCP24AA_ERROR_OK;
 372   error = mcp24aaWriteBuffer(addr, (uint8_t *)&value, sizeof(value));
 373
 374   // ToDo: Handle any errors
 375   if (error) { };
 376 }
 377
 378 /**************************************************************************/
 379 /*!
 380     @brief Writes an unsigned 64-bit integer to EEPROM
 381
 382     @param[in]  addr
 383                 The 16-bit address to write to in EEPROM
 384 */
 385 /**************************************************************************/
 386 void eepromWriteU64(uint16_t addr, uint64_t value)
 387 {
 388   mcp24aaError_e error = MCP24AA_ERROR_OK;
 389   error = mcp24aaWriteBuffer(addr, (uint8_t *)&value, sizeof(value));
 390
 391   // ToDo: Handle any errors
 392   if (error) { };
 393 }
 394
 395 /**************************************************************************/
 396 /*!
 397     @brief Writes a signed 64-bit integer to EEPROM
 398
 399     @param[in]  addr
 400                 The 16-bit address to write to in EEPROM
 401 */
 402 /**************************************************************************/
 403 void eepromWriteS64(uint16_t addr, int64_t value)
 404 {
 405   mcp24aaError_e error = MCP24AA_ERROR_OK;
 406   error = mcp24aaWriteBuffer(addr, (uint8_t *)&value, sizeof(value));
 407
 408   // ToDo: Handle any errors
 409   if (error) { };
 410 }