block.c

AMD公司官方版FLASH文件系统。有详细说明文档和Windows仿真测试环境。

/**
 * Block.c
 *
 */

#include "Block.h"
#include "SectorInfo.h"
#include "BlockTable.h"
#include "Device.h"

/**
 * dms_BlockRead
 * Reads the block data form the flash.
 * Assumes that the status of the block is valid.
 *
 * Prerequisites:
 *   dms_SectorInfoDeviceDeviceArchitecture() 
 * Uses:
 *   dms_SectorInfoGetBlockAddress()
 *   dms_DeviceRead()
 * Used By:
 *   dms_CellRead()
 *   dms_SectorCleanup()
 */
DMS_STATUS dms_BlockRead(WORD awSectorIndex, WORD awSectorBlockIndex, BYTE *apbData){
  DMS_STATUS eStatus;
  DWORD dwAddress;
  dwAddress = dms_SectorInfoGetBlockAddress(awSectorIndex,awSectorBlockIndex);
  eStatus = dms_DeviceRead(dwAddress, sizeof(DATABLOCK), apbData);
  if (eStatus != No_Error){
    return eStatus;
  }
  return No_Error;
}

/**
 * dms_BlockWrite
 * Writes block data to flash and writes block table information.
 * The Block Write Process:
 *   Write BlockBeingWritten in block status.
 *   Write cell number.
 *   Write block number.
 *   Write cell status.
 *   Write block data.
 *   Write BlockValid in block status.
 *
 * Prerequisites:
 *   dms_SectorInfoDeviceDeviceArchitecture() 
 * Uses:
 *   dms_SectorInfoGetBlockAddress()
 *   dms_DeviceWrite()
 *   dms_BlockTableWriteBlockStatus()
 *   dms_BlockTableWriteCellIndex()
 *   dms_BlockTableWriteBlockIndex()
 *   dms_BlockTableWriteCellStatus()
 * Used By:
 *   dms_CellWrite()
 *   dms_CellFormat()
 *   dms_SectorCleanup()
 */
DMS_STATUS dms_BlockWrite(WORD awCellIndex, WORD awBlockIndex, BYTE abCellStatus,
                          WORD awSectorIndex, WORD awSectorBlockIndex, BYTE *apbData){
  DMS_STATUS eStatus;
  DWORD dwAddress;
  
  /* Write Block Status */
  eStatus = dms_BlockTableWriteBlockStatus(awSectorIndex,awSectorBlockIndex,BlockBeingWritten);
  if (eStatus != No_Error){
    return eStatus;
  }
  /* Write Cell Index */
  eStatus = dms_BlockTableWriteCellIndex(awSectorIndex,awSectorBlockIndex,awCellIndex);
  if (eStatus != No_Error){
    return eStatus;
  }
  /* Write Block Index */
  eStatus = dms_BlockTableWriteBlockIndex(awSectorIndex,awSectorBlockIndex,awBlockIndex);
  if (eStatus != No_Error){
    return eStatus;
  }
  /* Write Cell Status */
  eStatus = dms_BlockTableWriteCellStatus(awSectorIndex,awSectorBlockIndex,abCellStatus);
  if (eStatus != No_Error){
    return eStatus;
  }

  /* Write Block Data */
  dwAddress = dms_SectorInfoGetBlockAddress(awSectorIndex,awSectorBlockIndex);
  eStatus = dms_DeviceWrite(dwAddress, sizeof(DATABLOCK), apbData);
  if (eStatus != No_Error){
    return eStatus;
  }

  /* Write Block Status */
  eStatus = dms_BlockTableWriteBlockStatus(awSectorIndex,awSectorBlockIndex,BlockValid);
  if (eStatus != No_Error){
    return eStatus;
  }

  return No_Error;
}