lowlvl.h

在flash上实现vsb文件系统的源码资料

#ifndef EXCLUDE_VSB

/*
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*/

#ifndef VSB_LOWLVL_H
#define VSB_LOWLVL_H

#include "datatype.h"

typedef struct media_struct {
   DWORD   media_size;
   DWORD   block_size;
   WORD    number_blocks;

   BYTE    media_type;
   WORD    manfct_id;
   WORD    device_id;
} MEDIA_INFO;

/********************************************************************
 * The media type field in the media info structure above
 * has several bit fields to indicate information about
 * the media. They are defined as follows:
 *
 * Any unused bit fields should remain zero.
 * Bit fields:
 *
 *  Bit 7      Bit 6    Bit 5    Bit 4    Bit 3    Bit 2    Bit 1    Bit 0
 *  -----------------------------------------------------------------------
 * | Unused | Unused | Unused | Unused | Unused | Write  | No     | SRAM   |
 * |        |        |        |        |        | Protect| Erase  | Card   |
 * |        |        |        |        |        | On     | Suspend|        |
 *  -----------------------------------------------------------------------
 *
 * Bit 7 = Unused (Set to zero)
 * Bit 6 = Unused (Set to zero)
 * Bit 5 = Unused (Set to zero)
 * Bit 4 = Unused (Set to zero)
 * Bit 3 = Unused (Set to zero)
 * Bit 2 = 1 if write protect is on, 0 if write protect is off
 * Bit 1 = 1 if erase suspend is unsupported, 0 if supported
 * Bit 0 = 1 if SRAM card, 0 if other (flash)
 **************************************************************************/
#define SRAM_MASK             0x01
#define NO_ERASE_SUSPEND_MASK 0x02
#define WRITE_PROTECT_ON_MASK 0x04

/*                      */
/*  Function Prototypes */
/*                      */
/*                      */
WORD FlashDevEraseBlock(DWORD address);
WORD FlashDevCompatCheck(MEDIA_INFO *pInfo);
WORD FlashDevRead(DWORD address,DWORD length,BYTE_PTR buffer);
WORD FlashDevWrite(DWORD address,DWORD length,BYTE_PTR buffer);

#endif /* VSB_LOWLVL_H */

#endif /* EXCLUDE_VSB */