memorybankscratch.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
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 * 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.OneWireIOException;
import com.dalsemi.onewire.utils.*;
import com.dalsemi.onewire.container.OneWireContainer;


/**
 * Memory bank class for the Scratchpad section of NVRAM iButtons and
 * 1-Wire devices.
 *
 *  @version    0.00, 28 Aug 2000
 *  @author     DS
 */
class MemoryBankScratch
   implements PagedMemoryBank, ScratchPad
{

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

   /**
     * Write Scratchpad Command
     */
   public static final byte WRITE_SCRATCHPAD_COMMAND = ( byte ) 0x0F;

   /**
     * Read Scratchpad Command
     */
   public static final byte READ_SCRATCHPAD_COMMAND = ( byte ) 0xAA;

   //--------
   //-------- 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;

   /**
    * Copy Scratchpad Command
    */
   protected byte COPY_SCRATCHPAD_COMMAND;

   /**
    * Flag to indicate that speed needs to be set
    */
   protected boolean doSetSpeed;

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

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

   /**
    * Memory bank descriptions
    */
   protected String bankDescription;

   /**
    * Memory bank usage flags
    */
   protected boolean generalPurposeMemory;

   /**
    * Flag if memory bank is read/write
    */
   protected boolean readWrite;

   /**
    * Flag if memory bank is write once (EPROM)
    */
   protected boolean writeOnce;

   /**
    * Flag if memory bank is read only
    */
   protected boolean readOnly;

   /**
    * Flag if memory bank is non volatile
    * (will not erase when power removed)
    */
   protected boolean nonVolatile;

   /**
    * Flag if memory bank needs program Pulse to write
    */
   protected boolean programPulse;

   /**
    * Flag if memory bank needs power delivery to write
    */
   protected boolean powerDelivery;

   /**
    * Starting physical address in memory bank.  Needed for different
    * types of memory in the same logical memory bank.  This can be
    * used to seperate them into two virtual memory banks.  Example:
    * DS2406 status page has mixed EPROM and Volatile RAM.
    */
   protected int startPhysicalAddress;

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

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

   /**
    * Number of pages in memory bank
    */
   protected int numberPages;

   /**
    *  page length in memory bank
    */
   protected int pageLength;

   /**
    * Max data length in page packet in memory bank
    */
   protected int maxPacketDataLength;

   /**
    * Flag if memory bank has page auto-CRC generation
    */
   protected boolean pageAutoCRC;

   /**
    * Flag if reading a page in memory bank provides optional
    * extra information (counter, tamper protection, SHA-1...)
    */
   protected boolean extraInfo;

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

   /**
    * Extra information descriptoin when reading page in memory bank
    */
   protected String extraInfoDescription;

   //--------
   //-------- Constructor
   //--------

   /**
    * Memory bank contstuctor.  Requires reference to the OneWireContainer
    * this memory bank resides on.
    */
   public MemoryBankScratch (OneWireContainer ibutton)
   {

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

      // initialize attributes of this memory bank - DEFAULT: DS199X scratchapd
      bankDescription      = "Scratchpad";
      generalPurposeMemory = false;
      startPhysicalAddress = 0;
      size                 = 32;
      readWrite            = true;
      writeOnce            = false;
      readOnly             = false;
      nonVolatile          = false;
      programPulse         = false;
      powerDelivery        = false;
      writeVerification    = true;
      numberPages          = 1;
      pageLength           = 32;
      maxPacketDataLength  = 29;
      pageAutoCRC          = false;
      extraInfo            = true;
      extraInfoLength      = 3;
      extraInfoDescription = "Target address, offset";

      // create the ffblock (used for faster 0xFF fills)
      ffBlock = new byte [96];

      for (int i = 0; i < 96; i++)
         ffBlock [i] = ( byte ) 0xFF;

      // default copy scratchpad command
      COPY_SCRATCHPAD_COMMAND = ( byte ) 0x55;

      // indicate speed has not been set
      doSetSpeed = true;
   }

   //--------
   //-------- Memory Bank 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 generalPurposeMemory;
   }

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

   /**
    * 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 writeOnce;
   }

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

   /**
    * 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 nonVolatile;
   }

   /**
    * 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 programPulse;
   }

   /**
    * 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 powerDelivery;
   }

   /**
    * 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 startPhysicalAddress;
   }

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

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