memorybankappreg.java

这是一个以JAVA编写的程序,本人还没有试过,是一个简单的温度控制系统

/*---------------------------------------------------------------------------
 * Copyright (C) 1999,2000 Dallas Semiconductor Corporation, All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY,  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES
 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of Dallas Semiconductor
 * shall not be used except as stated in the Dallas Semiconductor
 * Branding Policy.
 *---------------------------------------------------------------------------
 */

package com.dalsemi.onewire.container;

// imports
import com.dalsemi.onewire.OneWireException;
import com.dalsemi.onewire.adapter.*;
import com.dalsemi.onewire.utils.*;
import com.dalsemi.onewire.container.OneWireContainer;


/**
 * Memory bank class for the EPROM section of iButtons and 1-Wire devices.
 *
 *  @version    0.00, 28 Aug 2000
 *  @author     DS
 */
class MemoryBankAppReg
   implements OTPMemoryBank
{

   //--------
   //-------- Static Final Variables
   //--------

   /**
     * Memory page size
     */
   public static final int PAGE_SIZE = 8;

   /**
     * Read Memory Command
     */
   public static final byte READ_MEMORY_COMMAND = ( byte ) 0xC3;

   /**
     * Main memory write command
     */
   public static final byte WRITE_MEMORY_COMMAND = ( byte ) 0x99;

   /**
     * Copy/Lock command
     */
   public static final byte COPY_LOCK_COMMAND = ( byte ) 0x5A;

   /**
     * Copy/Lock command
     */
   public static final byte READ_STATUS_COMMAND = ( byte ) 0x66;

   /**
     * Copy/Lock validation key
     */
   public static final byte VALIDATION_KEY = ( byte ) 0xA5;

   /**
     * Flag in status register indicated the page is locked
     */
   public static final byte LOCKED_FLAG = ( byte ) 0xFC;

   //--------
   //-------- Variables
   //--------

   /**
    * Reference to the OneWireContainer this bank resides on.
    */
   protected OneWireContainer ib;

   /**
    * block of 0xFF's used for faster read pre-fill of 1-Wire blocks
    */
   protected byte[] ffBlock;

   //--------
   //-------- Protected Variables for MemoryBank implementation 
   //--------

   /**
    * Size of memory bank in bytes
    */
   protected int size;

   /**
    * Memory bank descriptions
    */
   protected static String bankDescription =
      "Application register, non-volatile when locked";

   /**
    * Flag if read back verification is enabled in 'write()'.
    */
   protected boolean writeVerification;

   //--------
   //-------- Protected Variables for PagedMemoryBank implementation 
   //--------

   /**
    * Length of extra information when reading a page in memory bank
    */
   protected int extraInfoLength;

   /**
    * Extra information descriptoin when reading page in memory bank
    */
   protected static String extraInfoDescription = "Page Locked flag";

   //--------
   //-------- Protected Variables for OTPMemoryBank implementation 
   //--------
   //--------
   //-------- Constructor
   //--------

   /**
    * Memory bank contstuctor.  Requires reference to the OneWireContainer
    * this memory bank resides on.  Requires reference to memory banks used
    * in OTP operations.
    */
   public MemoryBankAppReg (OneWireContainer ibutton)
   {

      // keep reference to ibutton where memory bank is
      ib = ibutton;

      // defaults
      writeVerification = true;

      // create the ffblock (used for faster 0xFF fills)
      ffBlock = new byte [50];

      for (int i = 0; i < 50; i++)
         ffBlock [i] = ( byte ) 0xFF;
   }

   //--------
   //-------- MemoryBank query methods
   //--------

   /**
    * Query to see get a string description of the current memory bank.
    *
    * @return  String containing the memory bank description
    */
   public String getBankDescription ()
   {
      return bankDescription;
   }

   /**
    * Query to see if the current memory bank is general purpose
    * user memory.  If it is NOT then it is Memory-Mapped and writing
    * values to this memory will affect the behavior of the 1-Wire
    * device.
    *
    * @return  'true' if current memory bank is general purpose
    */
   public boolean isGeneralPurposeMemory ()
   {
      return true;
   }

   /**
    * Query to see if current memory bank is read/write.
    *
    * @return  'true' if current memory bank is read/write
    */
   public boolean isReadWrite ()
   {
      return true;
   }

   /**
    * Query to see if current memory bank is write write once such
    * as with EPROM technology.
    *
    * @return  'true' if current memory bank can only be written once
    */
   public boolean isWriteOnce ()
   {
      return false;
   }

   /**
    * Query to see if current memory bank is read only.
    *
    * @return  'true' if current memory bank can only be read
    */
   public boolean isReadOnly ()
   {
      return false;
   }

   /**
    * Query to see if current memory bank non-volatile.  Memory is
    * non-volatile if it retains its contents even when removed from
    * the 1-Wire network.
    *
    * @return  'true' if current memory bank non volatile.
    */
   public boolean isNonVolatile ()
   {
      return false;
   }

   /**
    * Query to see if current memory bank pages need the adapter to
    * have a 'ProgramPulse' in order to write to the memory.
    *
    * @return  'true' if writing to the current memory bank pages
    *                 requires a 'ProgramPulse'.
    */
   public boolean needsProgramPulse ()
   {
      return false;
   }

   /**
    * Query to see if current memory bank pages need the adapter to
    * have a 'PowerDelivery' feature in order to write to the memory.
    *
    * @return  'true' if writing to the current memory bank pages
    *                 requires 'PowerDelivery'.
    */
   public boolean needsPowerDelivery ()
   {
      return true;
   }

   /**
    * Query to get the starting physical address of this bank.  Physical
    * banks are sometimes sub-divided into logical banks due to changes
    * in attributes.
    *
    * @return  physical starting address of this logical bank.
    */
   public int getStartPhysicalAddress ()
   {
      return 0;
   }

   /**
    * Query to get the memory bank size in bytes.
    *
    * @return  memory bank size in bytes.
    */
   public int getSize ()
   {
      return PAGE_SIZE;
   }

   //--------
   //-------- PagedMemoryBank query methods
   //--------

   /**
    * Query to get the number of pages in current memory bank.
    *
    * @return  number of pages in current memory bank
    */
   public int getNumberPages ()
   {
      return 1;
   }

   /**
    * Query to get  page length in bytes in current memory bank.
    *
    * @return   page length in bytes in current memory bank
    */
   public int getPageLength ()
   {
      return PAGE_SIZE;
   }

   /**
    * Query to get Maximum data page length in bytes for a packet
    * read or written in the current memory bank.  See the 'ReadPagePacket()'
    * and 'WritePagePacket()' methods.  This method is only usefull
    * if the current memory bank is general purpose memory.
    *
    * @return  max packet page length in bytes in current memory bank
    */
   public int getMaxPacketDataLength ()
   {
      return PAGE_SIZE - 2;
   }

   /**
    * Query to see if current memory bank pages can be read with
    * the contents being verified by a device generated CRC.
    * This is used to see if the 'ReadPageCRC()' can be used.
    *
    * @return  'true' if current memory bank can be read with self
    *          generated CRC.
    */
   public boolean hasPageAutoCRC ()
   {
      return false;
   }

   /**
    * Query to see if current memory bank pages when read deliver
    * extra information outside of the normal data space.  Examples
    * of this may be a redirection byte, counter, tamper protection
    * bytes, or SHA-1 result.  If this method returns true then the
    * methods 'ReadPagePacket()' and 'readPageCRC()' with 'extraInfo'
    * parameter can be used.
    *
    * @return  'true' if reading the current memory bank pages
    *                 provides extra information.
    *
    * @deprecated  As of 1-Wire API 0.01, replaced by {@link #hasExtraInfo()}
    */
   public boolean haveExtraInfo ()
   {
      return true;
   }

   /**
    * Checks to see if this memory bank's pages deliver extra 
    * information outside of the normal data space,  when read.  Examples
    * of this may be a redirection byte, counter, tamper protection
    * bytes, or SHA-1 result.  If this method returns true then the