[Mspsim-commit] SF.net SVN: mspsim:[303] mspsim/se/sics/mspsim/chip/FileAT45DB.java

[<jo...@us...>]

Revision: 303
          http://mspsim.svn.sourceforge.net/mspsim/?rev=303&view=rev
Author:   joxe
Date:     2008-09-06 20:03:45 +0000 (Sat, 06 Sep 2008)

Log Message:
-----------
added ext memory / flash chip

Added Paths:
-----------
    mspsim/se/sics/mspsim/chip/FileAT45DB.java

Added: mspsim/se/sics/mspsim/chip/FileAT45DB.java
===================================================================
--- mspsim/se/sics/mspsim/chip/FileAT45DB.java	                        (rev 0)
+++ mspsim/se/sics/mspsim/chip/FileAT45DB.java	2008-09-06 20:03:45 UTC (rev 303)
@@ -0,0 +1,143 @@
+/**
+ * Copyright (c) 2007, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of MSPSim.
+ *
+ * $Id:  $
+ *
+ * -----------------------------------------------------------------
+ *
+ * FileAT45DB - File based implementation of external flash.
+ *
+ * Author  : Joakim Eriksson, Fredrik Osterlind
+ * Created : Sun Oct 21 22:00:00 2007
+ * Updated : $Date: 2008-05-12 18:10:17 +0000 (Mon, 12 May 2008) $
+ *           $Revision: 280 $
+ */
+
+package se.sics.mspsim.chip;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.channels.FileChannel;
+import java.nio.channels.FileLock;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import se.sics.mspsim.core.MSP430Core;
+
+public class FileAT45DB extends AT45DB {
+
+  private static final boolean DEBUG = true;
+
+  // PAGE_SIZE and NUM_PAGES defined in AT45DB
+  private static final int FLASH_SIZE = PAGE_SIZE * NUM_PAGES;
+  
+  private RandomAccessFile file;
+  private FileChannel fileChannel;
+  private FileLock fileLock;
+
+  public FileAT45DB(MSP430Core cpu, String filename) {
+    super(cpu);
+    if (filename == null) {
+      filename = "flash.bin";
+    }
+
+    // Open flash file for R/W
+    if (!openFile(filename)) {
+      // Failed to open/lock the specified file. Add a counter and try with next filename.
+      Matcher m = Pattern.compile("(.+?)(\\d*)(\\.[^.]+)").matcher(filename);
+      if (m.matches()) {
+        String baseName = m.group(1);
+        String c = m.group(2);
+        String extName = m.group(3);
+        int count = 1;
+        if (c != null && c.length() > 0) {
+          count = Integer.parseInt(c) + 1;
+        }
+        for (int i = 0; !openFile(baseName + count + extName) && i < 100; i++, count++);
+      }
+    }
+    if (fileLock == null) {
+      // Failed to open flash file
+      throw new IllegalStateException("failed to open flash file '" + filename + '\'');
+    }
+    // Set size of flash
+    try {
+      file.setLength(FLASH_SIZE);
+    } catch (IOException e) {
+      e.printStackTrace();
+    }
+  }
+
+  private boolean openFile(String filename) {
+    // Open flash file for R/W
+    try {
+      file = new RandomAccessFile(filename, "rw");
+      fileChannel = file.getChannel();
+      fileLock = fileChannel.tryLock();
+      if (fileLock != null) {
+        // The file is now locked for use
+        if (DEBUG) System.out.println("FileAT45DB: using flash file '" + filename + '\'');
+        return true;
+      } else {
+        fileChannel.close();
+        return false;
+      }
+    } catch (IOException e) {
+      e.printStackTrace();
+      closeFile();
+      return false;
+    }
+  }
+
+  private void closeFile() {
+    try {
+      if (fileLock != null) {
+        fileLock.release();
+        fileLock = null;
+      }
+      if (fileChannel != null) {
+        fileChannel.close();
+        fileChannel = null;
+      }
+    } catch (IOException e) {
+      e.printStackTrace();
+    }
+  }
+
+  public void seek(long pos) throws IOException {
+    file.seek(pos);
+  }
+
+  public int read(byte[] b) throws IOException {
+    return file.read(b);
+  }
+
+  public void write(byte[] b) throws IOException {
+    file.write(b);
+  }
+
+} // FileAT45DB


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