fs_lib.c

keil arm flash fs 最新版 在Ｋｅｉｌ ａｒｍ下使用

/*----------------------------------------------------------------------------
 *      R T L  -  F l a s h   F i l e   S y s t e m
 *----------------------------------------------------------------------------
 *      Name:    FS_LIB.C 
 *      Purpose: System Library Module
 *      Rev.:    V3.22
 *----------------------------------------------------------------------------
 *      This code is part of the RealView Run-Time Library.
 *      Copyright (c) 2004-2008 KEIL - An ARM Company. All rights reserved.
 *---------------------------------------------------------------------------*/

#include "File_Config.h"
#include <string.h>

/*----------------------------------------------------------------------------
 *      Functions
 *---------------------------------------------------------------------------*/


/*--------------------------- fn_cmp ----------------------------------------*/

BOOL fn_cmp (const S8 *sp, const S8 *fp) {
   /* Compare flash filename string with provided filename. */

   for (  ; *sp; sp++, fp++) {
      if (*sp != *fp) {
         return (__FALSE);
      }
   }
   if (*fp != 0) {
      return (__FALSE);
   }
   return (__TRUE);
} /* end of fn_cmp */


/*--------------------------- fs_strpos -------------------------------------*/

int fs_strpos (const S8 *sp, const S8 ch) {
   /* Find a position of 'ch' in a string */
   int i;

   for (i = 0; *sp; sp++, i++) {
      if (*sp == ch) {
         return (i);
      }
   }
   return (-1);
} /* end of fs_strpos */


/*--------------------------- fs_ReadData -----------------------------------*/

int fs_ReadData (U32 adr, U32 cnt, U8 *buf)  {
   /* Read Data from RAM memory to buffer. */

   memcpy (buf, (void *)adr, cnt);
   return (0);
} /* end of fs_ReadData */


/*--------------------------- fs_WriteData -----------------------------------*/

int fs_WriteData (U32 adr, U32 cnt, U8 *buf)  {
   /* Write Data from buffer to RAM memory. */

   memcpy ((void *)adr, buf, cnt);
   return (0);
} /* end of fs_WriteData */


/*--------------------------- fs_get_drive ----------------------------------*/

int fs_get_drive (const S8 *fn) {
   /* Check if drive letter provided. */

   if (*(fn+1) != ':') {
      return (DRV_NONE);
   }
   switch (*fn) {
      /* 'F:' - Flash device */
      case 'F':
      case 'f':
         return (DRV_FLASH);
      /* 'S:' - SPI Flash device. */
      case 'S':
      case 's':
         return (DRV_SPI);
      /* 'R:' - RAM device */
      case 'R':
      case 'r':
         return (DRV_RAM);
      /* 'M:' - SD Card device. */
      case 'M':
      case 'm':
         return (DRV_MCARD);

   }
   return (DRV_NONE);
} /* end of fs_get_drive */


/*--------------------------- fs_find_iob -----------------------------------*/

int fs_find_iob (void) {
   /* Find unused _iob[] structure. */
   IOB *fcb;
   U32 i,nfile = _NFILE;

   for (i = 0, fcb = &_iob[0]; i < nfile; fcb++, i++) {
      if (!(fcb->flags & (_IOREAD|_IOWRT))) {
         /* Clear File Control Block, return '_iob' index. */
         memset (fcb, 0, sizeof (struct iob));
         return (i);
      }
   }
   return (EOF);
} /* end of fs_find_iob */


/*--------------------------- fs_set_params ---------------------------------*/

BOOL fs_set_params (IOB *fcb) {
   /* Set Flash/Ram drive Device parameters. */

   switch (fcb->drive) {
      case DRV_FLASH:
         fcb->DevCfg  = (DEVCONF *)&FlashDev[0];
         fcb->InitVal = _BlockFREE;
         fcb->NumSect = _FlashNumSect;
         break;
      case DRV_SPI:
         fcb->DevCfg  = (DEVCONF *)&SpiDev[0];
         fcb->InitVal = _SpiBlFREE;
         fcb->NumSect = _SpiNumSect;
         break;
      case DRV_RAM:
         fcb->DevCfg  = (DEVCONF *)&RamDev[0];
         fcb->InitVal = 0x00000000;
         fcb->NumSect = _RamNumSect;
         break;
      default:
         return (__FALSE);
   }
   if (fcb->NumSect == 0) {
      /* This device disabled from the configuration. */
      return (__FALSE);
   }
   return (__TRUE);
} /* end of fs_set_params */


/*----------------------------------------------------------------------------
 * end of file
 *---------------------------------------------------------------------------*/