| 1 |
hedin |
62 |
/*********************************************************************
|
| 2 |
|
|
*
|
| 3 |
|
|
* Microchip File System Implementaion on PIC18
|
| 4 |
|
|
*
|
| 5 |
|
|
*********************************************************************
|
| 6 |
|
|
* FileName: MPFS.c
|
| 7 |
|
|
* Dependencies: stacktsk.H
|
| 8 |
|
|
* mpfs.h
|
| 9 |
|
|
* Processor: PIC18
|
| 10 |
|
|
* Complier: MCC18 v1.00.50 or higher
|
| 11 |
|
|
* HITECH PICC-18 V8.10PL1 or higher
|
| 12 |
|
|
* Company: Microchip Technology, Inc.
|
| 13 |
|
|
*
|
| 14 |
|
|
* Software License Agreement
|
| 15 |
|
|
*
|
| 16 |
|
|
* The software supplied herewith by Microchip Technology Incorporated
|
| 17 |
|
|
* (the “Company”) for its PICmicro® Microcontroller is intended and
|
| 18 |
|
|
* supplied to you, the Company’s customer, for use solely and
|
| 19 |
|
|
* exclusively on Microchip PICmicro Microcontroller products. The
|
| 20 |
|
|
* software is owned by the Company and/or its supplier, and is
|
| 21 |
|
|
* protected under applicable copyright laws. All rights are reserved.
|
| 22 |
|
|
* Any use in violation of the foregoing restrictions may subject the
|
| 23 |
|
|
* user to criminal sanctions under applicable laws, as well as to
|
| 24 |
|
|
* civil liability for the breach of the terms and conditions of this
|
| 25 |
|
|
* license.
|
| 26 |
|
|
*
|
| 27 |
|
|
* THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES,
|
| 28 |
|
|
* WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
|
| 29 |
|
|
* TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
| 30 |
|
|
* PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
|
| 31 |
|
|
* IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
|
| 32 |
|
|
* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
|
| 33 |
|
|
*
|
| 34 |
|
|
* HiTech PICC18 Compiler Options excluding device selection:
|
| 35 |
|
|
* -FAKELOCAL -G -E -C
|
| 36 |
|
|
*
|
| 37 |
|
|
*
|
| 38 |
|
|
*
|
| 39 |
|
|
*
|
| 40 |
|
|
*
|
| 41 |
|
|
* Author Date Comment
|
| 42 |
|
|
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
| 43 |
|
|
* Nilesh Rajbharti 8/14/01 Original (Rev. 1.0)
|
| 44 |
|
|
* Nilesh Rajbharti 2/9/02 Cleanup
|
| 45 |
|
|
* Nilesh Rajbharti 5/22/02 Rev 2.0 (See version.log for detail)
|
| 46 |
|
|
********************************************************************/
|
| 47 |
|
|
#define THIS_IS_MPFS
|
| 48 |
|
|
|
| 49 |
|
|
#include <string.h>
|
| 50 |
|
|
#include <stdlib.h>
|
| 51 |
|
|
|
| 52 |
|
|
#include "mpfs.h"
|
| 53 |
|
|
|
| 54 |
|
|
#if defined(MPFS_USE_EEPROM)
|
| 55 |
|
|
#include "xeeprom.h"
|
| 56 |
|
|
#endif
|
| 57 |
|
|
|
| 58 |
|
|
/*
|
| 59 |
|
|
* This file system supports short file names i.e. 8 + 3.
|
| 60 |
|
|
*/
|
| 61 |
|
|
#define MAX_FILE_NAME_LEN (12)
|
| 62 |
|
|
|
| 63 |
|
|
#define MPFS_DATA (0x00)
|
| 64 |
|
|
#define MPFS_DELETED (0x01)
|
| 65 |
|
|
#define MPFS_DLE (0x03)
|
| 66 |
|
|
#define MPFS_ETX (0x04)
|
| 67 |
|
|
|
| 68 |
|
|
/*
|
| 69 |
|
|
* MPFS Structure:
|
| 70 |
|
|
*
|
| 71 |
|
|
* MPFS_Start:
|
| 72 |
|
|
* <MPFS_DATA><Address1><FileName1>
|
| 73 |
|
|
* <MPFS_DATA><Address2><FileName2>
|
| 74 |
|
|
* ...
|
| 75 |
|
|
* <MPFS_ETX><Addressn><FileNamen>
|
| 76 |
|
|
* Address1:
|
| 77 |
|
|
* <Data1>[<Data2>...<Datan>]<MPFS_ETX><MPFS_INVALID>
|
| 78 |
|
|
* ...
|
| 79 |
|
|
*
|
| 80 |
|
|
* Note: If File data contains either MPFS_DLE or MPFS_ETX
|
| 81 |
|
|
* extra MPFS_DLE is stuffed before that byte.
|
| 82 |
|
|
*/
|
| 83 |
|
|
typedef struct _MPFS_ENTRY
|
| 84 |
|
|
{
|
| 85 |
|
|
BYTE Flag;
|
| 86 |
|
|
|
| 87 |
|
|
MPFS Address;
|
| 88 |
|
|
BYTE Name[MAX_FILE_NAME_LEN]; // 8 + '.' + 3
|
| 89 |
|
|
} MPFS_ENTRY;
|
| 90 |
|
|
|
| 91 |
|
|
static union
|
| 92 |
|
|
{
|
| 93 |
|
|
struct
|
| 94 |
|
|
{
|
| 95 |
|
|
unsigned int bNotAvailable : 1;
|
| 96 |
|
|
} bits;
|
| 97 |
|
|
BYTE Val;
|
| 98 |
|
|
} mpfsFlags;
|
| 99 |
|
|
|
| 100 |
|
|
BYTE mpfsOpenCount;
|
| 101 |
|
|
|
| 102 |
|
|
#if defined(MPFS_USE_PGRM)
|
| 103 |
|
|
/*
|
| 104 |
|
|
* An address where MPFS data starts in program memory.
|
| 105 |
|
|
*/
|
| 106 |
|
|
extern MPFS MPFS_Start;
|
| 107 |
|
|
|
| 108 |
|
|
#else
|
| 109 |
|
|
|
| 110 |
|
|
#define MPFS_Start MPFS_RESERVE_BLOCK
|
| 111 |
|
|
|
| 112 |
|
|
#endif
|
| 113 |
|
|
|
| 114 |
|
|
MPFS _currentHandle;
|
| 115 |
|
|
MPFS _currentFile;
|
| 116 |
|
|
BYTE _currentCount;
|
| 117 |
|
|
|
| 118 |
|
|
|
| 119 |
|
|
/*********************************************************************
|
| 120 |
|
|
* Function: BOOL MPFSInit(void)
|
| 121 |
|
|
*
|
| 122 |
|
|
* PreCondition: None
|
| 123 |
|
|
*
|
| 124 |
|
|
* Input: None
|
| 125 |
|
|
*
|
| 126 |
|
|
* Output: TRUE, if MPFS Storage access is initialized and
|
| 127 |
|
|
* MPFS is is ready to be used.
|
| 128 |
|
|
* FALSE otherwise
|
| 129 |
|
|
*
|
| 130 |
|
|
* Side Effects: None
|
| 131 |
|
|
*
|
| 132 |
|
|
* Overview: None
|
| 133 |
|
|
*
|
| 134 |
|
|
* Note: None
|
| 135 |
|
|
********************************************************************/
|
| 136 |
|
|
BOOL MPFSInit(void)
|
| 137 |
|
|
{
|
| 138 |
|
|
mpfsOpenCount = 0;
|
| 139 |
|
|
mpfsFlags.Val = 0;
|
| 140 |
|
|
|
| 141 |
|
|
#if defined(MPFS_USE_PGRM)
|
| 142 |
|
|
return TRUE;
|
| 143 |
|
|
#else
|
| 144 |
|
|
/*
|
| 145 |
|
|
* Initialize the EEPROM access routines.
|
| 146 |
|
|
* Use ~ 400 Khz.
|
| 147 |
|
|
*/
|
| 148 |
|
|
XEEInit(EE_BAUD(CLOCK_FREQ, 400000));
|
| 149 |
|
|
|
| 150 |
|
|
return TRUE;
|
| 151 |
|
|
#endif
|
| 152 |
|
|
}
|
| 153 |
|
|
|
| 154 |
|
|
|
| 155 |
|
|
/*********************************************************************
|
| 156 |
|
|
* Function: MPFS MPFSOpen(BYTE* file)
|
| 157 |
|
|
*
|
| 158 |
|
|
* PreCondition: None
|
| 159 |
|
|
*
|
| 160 |
|
|
* Input: file - NULL terminated file name.
|
| 161 |
|
|
*
|
| 162 |
|
|
* Output: A handle if file is found
|
| 163 |
|
|
* MPFS_INVALID if file is not found.
|
| 164 |
|
|
*
|
| 165 |
|
|
* Side Effects: None
|
| 166 |
|
|
*
|
| 167 |
|
|
* Overview: None
|
| 168 |
|
|
*
|
| 169 |
|
|
* Note: None
|
| 170 |
|
|
********************************************************************/
|
| 171 |
|
|
MPFS MPFSOpen(BYTE* file)
|
| 172 |
|
|
{
|
| 173 |
|
|
MPFS_ENTRY entry;
|
| 174 |
|
|
MPFS FAT;
|
| 175 |
|
|
BYTE fileNameLen;
|
| 176 |
|
|
|
| 177 |
|
|
if ( mpfsFlags.bits.bNotAvailable )
|
| 178 |
|
|
return MPFS_NOT_AVAILABLE;
|
| 179 |
|
|
|
| 180 |
|
|
#if defined(MPFS_USE_PGRM)
|
| 181 |
|
|
FAT = (MPFS)&MPFS_Start;
|
| 182 |
|
|
#else
|
| 183 |
|
|
FAT = MPFS_Start;
|
| 184 |
|
|
#endif
|
| 185 |
|
|
|
| 186 |
|
|
/*
|
| 187 |
|
|
* If string is empty, do not attempt to find it in FAT.
|
| 188 |
|
|
*/
|
| 189 |
|
|
if ( *file == '\0' )
|
| 190 |
|
|
return MPFS_INVALID;
|
| 191 |
|
|
|
| 192 |
|
|
file = (BYTE*)strupr((char*)file);
|
| 193 |
|
|
|
| 194 |
|
|
while(1)
|
| 195 |
|
|
{
|
| 196 |
|
|
#if defined(MPFS_USE_PGRM)
|
| 197 |
|
|
// Bring current FAT entry into RAM.
|
| 198 |
|
|
memcpypgm2ram(&entry, (ROM void*)FAT, sizeof(entry));
|
| 199 |
|
|
#else
|
| 200 |
|
|
XEEReadArray(EEPROM_CONTROL, FAT, (unsigned char*)&entry, sizeof(entry));
|
| 201 |
|
|
#endif
|
| 202 |
|
|
|
| 203 |
|
|
// Make sure that it is a valid entry.
|
| 204 |
|
|
if ( entry.Flag == MPFS_DATA )
|
| 205 |
|
|
{
|
| 206 |
|
|
// Does the file name match ?
|
| 207 |
|
|
fileNameLen = strlen((char*)file);
|
| 208 |
|
|
if ( fileNameLen > MAX_FILE_NAME_LEN )
|
| 209 |
|
|
fileNameLen = MAX_FILE_NAME_LEN;
|
| 210 |
|
|
|
| 211 |
|
|
if( !strncmp((char*)file, (char*)entry.Name, fileNameLen) )
|
| 212 |
|
|
{
|
| 213 |
|
|
_currentFile = (MPFS)entry.Address;
|
| 214 |
|
|
mpfsOpenCount++;
|
| 215 |
|
|
return entry.Address;
|
| 216 |
|
|
}
|
| 217 |
|
|
|
| 218 |
|
|
// File does not match. Try next entry...
|
| 219 |
|
|
FAT += sizeof(entry);
|
| 220 |
|
|
}
|
| 221 |
|
|
else if ( entry.Flag == MPFS_ETX )
|
| 222 |
|
|
{
|
| 223 |
|
|
if ( entry.Address != (MPFS)MPFS_INVALID )
|
| 224 |
|
|
FAT = (MPFS)entry.Address;
|
| 225 |
|
|
else
|
| 226 |
|
|
break;
|
| 227 |
|
|
}
|
| 228 |
|
|
else
|
| 229 |
|
|
return (MPFS)MPFS_INVALID;
|
| 230 |
|
|
}
|
| 231 |
|
|
return (MPFS)MPFS_INVALID;
|
| 232 |
|
|
}
|
| 233 |
|
|
|
| 234 |
|
|
|
| 235 |
|
|
/*********************************************************************
|
| 236 |
|
|
* Function: void MPFSClose(void)
|
| 237 |
|
|
*
|
| 238 |
|
|
* PreCondition: None
|
| 239 |
|
|
*
|
| 240 |
|
|
* Input: handle - File handle to be closed
|
| 241 |
|
|
*
|
| 242 |
|
|
* Output: None
|
| 243 |
|
|
*
|
| 244 |
|
|
* Side Effects: None
|
| 245 |
|
|
*
|
| 246 |
|
|
* Overview: None
|
| 247 |
|
|
*
|
| 248 |
|
|
* Note: None
|
| 249 |
|
|
********************************************************************/
|
| 250 |
|
|
void MPFSClose(void)
|
| 251 |
|
|
{
|
| 252 |
|
|
_currentCount = 0;
|
| 253 |
|
|
mpfsFlags.bits.bNotAvailable = FALSE;
|
| 254 |
|
|
if ( mpfsOpenCount )
|
| 255 |
|
|
mpfsOpenCount--;
|
| 256 |
|
|
}
|
| 257 |
|
|
|
| 258 |
|
|
|
| 259 |
|
|
/*********************************************************************
|
| 260 |
|
|
* Function: BOOL MPFSGetBegin(MPFS handle)
|
| 261 |
|
|
*
|
| 262 |
|
|
* PreCondition: MPFSOpen() != MPFS_INVALID &&
|
| 263 |
|
|
*
|
| 264 |
|
|
* Input: handle - handle of file that is to be read
|
| 265 |
|
|
*
|
| 266 |
|
|
* Output: TRUE if successful
|
| 267 |
|
|
* !TRUE otherwise
|
| 268 |
|
|
*
|
| 269 |
|
|
* Side Effects: None
|
| 270 |
|
|
*
|
| 271 |
|
|
* Overview: Prepares MPFS storage media for subsequent reads.
|
| 272 |
|
|
*
|
| 273 |
|
|
* Note: None
|
| 274 |
|
|
********************************************************************/
|
| 275 |
|
|
#if defined(MPFS_USE_EEPROM)
|
| 276 |
|
|
BOOL MPFSGetBegin(MPFS handle)
|
| 277 |
|
|
{
|
| 278 |
|
|
_currentHandle = handle;
|
| 279 |
|
|
return (XEEBeginRead(EEPROM_CONTROL, handle) == XEE_SUCCESS);
|
| 280 |
|
|
}
|
| 281 |
|
|
#endif
|
| 282 |
|
|
|
| 283 |
|
|
/*********************************************************************
|
| 284 |
|
|
* Function: BYTE MPFSGet(void)
|
| 285 |
|
|
*
|
| 286 |
|
|
* PreCondition: MPFSOpen() != MPFS_INVALID &&
|
| 287 |
|
|
* MPFSGetBegin() == TRUE
|
| 288 |
|
|
*
|
| 289 |
|
|
* Input: None
|
| 290 |
|
|
*
|
| 291 |
|
|
* Output: Data byte from current address.
|
| 292 |
|
|
*
|
| 293 |
|
|
* Side Effects: None
|
| 294 |
|
|
*
|
| 295 |
|
|
* Overview: Reads a byte from current address.
|
| 296 |
|
|
*
|
| 297 |
|
|
* Note: Caller must call MPFSIsEOF() to check for end of
|
| 298 |
|
|
* file condition
|
| 299 |
|
|
********************************************************************/
|
| 300 |
|
|
BYTE MPFSGet(void)
|
| 301 |
|
|
{
|
| 302 |
|
|
BYTE t;
|
| 303 |
|
|
|
| 304 |
|
|
#if defined(MPFS_USE_PGRM)
|
| 305 |
|
|
t = (BYTE)*_currentHandle;
|
| 306 |
|
|
#else
|
| 307 |
|
|
t = XEERead();
|
| 308 |
|
|
#endif
|
| 309 |
|
|
_currentHandle++;
|
| 310 |
|
|
|
| 311 |
|
|
if ( t == MPFS_DLE )
|
| 312 |
|
|
{
|
| 313 |
|
|
#if defined(MPFS_USE_PGRM)
|
| 314 |
|
|
t = (BYTE)*_currentHandle;
|
| 315 |
|
|
#else
|
| 316 |
|
|
t = XEERead();
|
| 317 |
|
|
#endif
|
| 318 |
|
|
_currentHandle++;
|
| 319 |
|
|
}
|
| 320 |
|
|
else if ( t == MPFS_ETX )
|
| 321 |
|
|
{
|
| 322 |
|
|
_currentHandle = MPFS_INVALID;
|
| 323 |
|
|
}
|
| 324 |
|
|
|
| 325 |
|
|
return t;
|
| 326 |
|
|
|
| 327 |
|
|
}
|
| 328 |
|
|
|
| 329 |
|
|
|
| 330 |
|
|
/*********************************************************************
|
| 331 |
|
|
* Function: MPFS MPFSGetEnd(void)
|
| 332 |
|
|
*
|
| 333 |
|
|
* PreCondition: MPFSOpen() != MPFS_INVALID &&
|
| 334 |
|
|
* MPFSGetBegin() = TRUE
|
| 335 |
|
|
*
|
| 336 |
|
|
* Input: None
|
| 337 |
|
|
*
|
| 338 |
|
|
* Output: Current mpfs handle.
|
| 339 |
|
|
*
|
| 340 |
|
|
* Side Effects: None
|
| 341 |
|
|
*
|
| 342 |
|
|
* Overview: Ends on-going read cycle.
|
| 343 |
|
|
* MPFS handle that is returned must be used
|
| 344 |
|
|
* for subsequent begin gets..
|
| 345 |
|
|
*
|
| 346 |
|
|
* Note: None
|
| 347 |
|
|
********************************************************************/
|
| 348 |
|
|
#if defined(MPFS_USE_EEPROM)
|
| 349 |
|
|
MPFS MPFSGetEnd(void)
|
| 350 |
|
|
{
|
| 351 |
|
|
XEEEndRead();
|
| 352 |
|
|
return _currentHandle;
|
| 353 |
|
|
}
|
| 354 |
|
|
#endif
|
| 355 |
|
|
|
| 356 |
|
|
|
| 357 |
|
|
/*********************************************************************
|
| 358 |
|
|
* Function: MPFS MPFSFormat(void)
|
| 359 |
|
|
*
|
| 360 |
|
|
* PreCondition: None
|
| 361 |
|
|
*
|
| 362 |
|
|
* Input: None
|
| 363 |
|
|
*
|
| 364 |
|
|
* Output: A valid MPFS handle that can be used for MPFSPut
|
| 365 |
|
|
*
|
| 366 |
|
|
* Side Effects: None
|
| 367 |
|
|
*
|
| 368 |
|
|
* Overview: Prepares MPFS image to get re-written
|
| 369 |
|
|
* Declares MPFS as in use.
|
| 370 |
|
|
*
|
| 371 |
|
|
* Note: MPFS will be unaccessible until MPFSClose is
|
| 372 |
|
|
* called.
|
| 373 |
|
|
********************************************************************/
|
| 374 |
|
|
MPFS MPFSFormat(void)
|
| 375 |
|
|
{
|
| 376 |
|
|
mpfsFlags.bits.bNotAvailable = TRUE;
|
| 377 |
|
|
return (MPFS)MPFS_RESERVE_BLOCK;
|
| 378 |
|
|
}
|
| 379 |
|
|
|
| 380 |
|
|
|
| 381 |
|
|
/*********************************************************************
|
| 382 |
|
|
* Function: BOOL MPFSPutBegin(MPFS handle)
|
| 383 |
|
|
*
|
| 384 |
|
|
* PreCondition: MPFSInit() and MPFSFormat() are already called.
|
| 385 |
|
|
*
|
| 386 |
|
|
* Input: handle - handle to where put to begin
|
| 387 |
|
|
*
|
| 388 |
|
|
* Output: TRUE if successful
|
| 389 |
|
|
* !TRUE otherwise
|
| 390 |
|
|
*
|
| 391 |
|
|
* Side Effects: None
|
| 392 |
|
|
*
|
| 393 |
|
|
* Overview: Prepares MPFS image to get re-written
|
| 394 |
|
|
*
|
| 395 |
|
|
* Note: MPFS will be unaccessible until MPFSClose is
|
| 396 |
|
|
* called.
|
| 397 |
|
|
********************************************************************/
|
| 398 |
|
|
#if defined(MPFS_USE_EEPROM)
|
| 399 |
|
|
BOOL MPFSPutBegin(MPFS handle)
|
| 400 |
|
|
{
|
| 401 |
|
|
//_currentCount = 0;
|
| 402 |
|
|
_currentHandle = handle;
|
| 403 |
|
|
_currentCount = (BYTE)handle;
|
| 404 |
|
|
_currentCount &= (MPFS_WRITE_PAGE_SIZE-1);
|
| 405 |
|
|
return (XEEBeginWrite(EEPROM_CONTROL, handle) == XEE_SUCCESS);
|
| 406 |
|
|
}
|
| 407 |
|
|
#endif
|
| 408 |
|
|
|
| 409 |
|
|
|
| 410 |
|
|
/*********************************************************************
|
| 411 |
|
|
* Function: BOOL MPFSPut(BYTE b)
|
| 412 |
|
|
*
|
| 413 |
|
|
* PreCondition: MPFSFormat() or MPFSCreate() must be called
|
| 414 |
|
|
* MPFSPutBegin() is already called.
|
| 415 |
|
|
*
|
| 416 |
|
|
* Input: b - data to write.
|
| 417 |
|
|
*
|
| 418 |
|
|
* Output: TRUE if successfull
|
| 419 |
|
|
* !TRUE if failed.
|
| 420 |
|
|
*
|
| 421 |
|
|
* Side Effects: Original MPFS handle is no longer valid.
|
| 422 |
|
|
* Updated MPFS handle must be obtained by calling
|
| 423 |
|
|
* MPFSPutEnd().
|
| 424 |
|
|
*
|
| 425 |
|
|
* Overview: None
|
| 426 |
|
|
*
|
| 427 |
|
|
* Note: Actual write may not get started until internal
|
| 428 |
|
|
* write page is full. To ensure that previously
|
| 429 |
|
|
* data gets written, caller must call MPFSPutEnd()
|
| 430 |
|
|
* after last call to MPFSPut().
|
| 431 |
|
|
********************************************************************/
|
| 432 |
|
|
BOOL MPFSPut(BYTE b)
|
| 433 |
|
|
{
|
| 434 |
|
|
#if defined(MPFS_USE_EEPROM)
|
| 435 |
|
|
if ( XEEWrite(b) )
|
| 436 |
|
|
return FALSE;
|
| 437 |
|
|
|
| 438 |
|
|
_currentCount++;
|
| 439 |
|
|
_currentHandle++;
|
| 440 |
|
|
if ( _currentCount >= MPFS_WRITE_PAGE_SIZE )
|
| 441 |
|
|
{
|
| 442 |
|
|
MPFSPutEnd();
|
| 443 |
|
|
XEEBeginWrite(EEPROM_CONTROL, _currentHandle);
|
| 444 |
|
|
}
|
| 445 |
|
|
#endif
|
| 446 |
|
|
return TRUE;
|
| 447 |
|
|
}
|
| 448 |
|
|
|
| 449 |
|
|
/*********************************************************************
|
| 450 |
|
|
* Function: MPFS MPFSPutEnd(void)
|
| 451 |
|
|
*
|
| 452 |
|
|
* PreCondition: MPFSPutBegin() is already called.
|
| 453 |
|
|
*
|
| 454 |
|
|
* Input: None
|
| 455 |
|
|
*
|
| 456 |
|
|
* Output: Up-to-date MPFS handle
|
| 457 |
|
|
*
|
| 458 |
|
|
* Side Effects: Original MPFS handle is no longer valid.
|
| 459 |
|
|
* Updated MPFS handle must be obtained by calling
|
| 460 |
|
|
* MPFSPutEnd().
|
| 461 |
|
|
*
|
| 462 |
|
|
* Overview: None
|
| 463 |
|
|
*
|
| 464 |
|
|
* Note: Actual write may not get started until internal
|
| 465 |
|
|
* write page is full. To ensure that previously
|
| 466 |
|
|
* data gets written, caller must call MPFSPutEnd()
|
| 467 |
|
|
* after last call to MPFSPut().
|
| 468 |
|
|
********************************************************************/
|
| 469 |
|
|
MPFS MPFSPutEnd(void)
|
| 470 |
|
|
{
|
| 471 |
|
|
#if defined(MPFS_USE_EEPROM)
|
| 472 |
|
|
_currentCount = 0;
|
| 473 |
|
|
XEEEndWrite();
|
| 474 |
|
|
while( XEEIsBusy(EEPROM_CONTROL) );
|
| 475 |
|
|
#endif
|
| 476 |
|
|
|
| 477 |
|
|
return _currentHandle;
|
| 478 |
|
|
}
|
| 479 |
|
|
|
| 480 |
|
|
/*********************************************************************
|
| 481 |
|
|
* Function: MPFS MPFSSeek(MPFS_OFFSET offset)
|
| 482 |
|
|
*
|
| 483 |
|
|
* PreCondition: MPFSGetBegin() is already called.
|
| 484 |
|
|
*
|
| 485 |
|
|
* Input: offset - Offset from current pointer
|
| 486 |
|
|
*
|
| 487 |
|
|
* Output: New MPFS handle located to given offset
|
| 488 |
|
|
*
|
| 489 |
|
|
* Side Effects: None.
|
| 490 |
|
|
*
|
| 491 |
|
|
* Overview: None
|
| 492 |
|
|
*
|
| 493 |
|
|
* Note: None.
|
| 494 |
|
|
********************************************************************/
|
| 495 |
|
|
MPFS MPFSSeek(MPFS_OFFSET offset)
|
| 496 |
|
|
{
|
| 497 |
|
|
WORD i;
|
| 498 |
|
|
|
| 499 |
|
|
MPFSGetBegin(_currentFile);
|
| 500 |
|
|
|
| 501 |
|
|
i = 0;
|
| 502 |
|
|
while(i++ != offset)
|
| 503 |
|
|
MPFSGet();
|
| 504 |
|
|
|
| 505 |
|
|
MPFSGetEnd();
|
| 506 |
|
|
|
| 507 |
|
|
return _currentHandle;
|
| 508 |
|
|
}
|
Parent Directory
| 
Revision Log