Import SD library from Arduino 1.0.5

File.cpp

@@ -0,0 +1,150 @@
+/*
+
+ SD - a slightly more friendly wrapper for sdfatlib
+
+ This library aims to expose a subset of SD card functionality
+ in the form of a higher level "wrapper" object.
+
+ License: GNU General Public License V3
+          (Because sdfatlib is licensed with this.)
+
+ (C) Copyright 2010 SparkFun Electronics
+
+ */
+
+#include <SD.h>
+
+/* for debugging file open/close leaks
+   uint8_t nfilecount=0;
+*/
+
+File::File(SdFile f, const char *n) {
+  // oh man you are kidding me, new() doesnt exist? Ok we do it by hand!
+  _file = (SdFile *)malloc(sizeof(SdFile)); 
+  if (_file) {
+    memcpy(_file, &f, sizeof(SdFile));
+    
+    strncpy(_name, n, 12);
+    _name[12] = 0;
+    
+    /* for debugging file open/close leaks
+       nfilecount++;
+       Serial.print("Created \"");
+       Serial.print(n);
+       Serial.print("\": ");
+       Serial.println(nfilecount, DEC);
+    */
+  }
+}
+
+File::File(void) {
+  _file = 0;
+  _name[0] = 0;
+  //Serial.print("Created empty file object");
+}
+
+File::~File(void) {
+  //  Serial.print("Deleted file object");
+}
+
+// returns a pointer to the file name
+char *File::name(void) {
+  return _name;
+}
+
+// a directory is a special type of file
+boolean File::isDirectory(void) {
+  return (_file && _file->isDir());
+}
+
+
+size_t File::write(uint8_t val) {
+  return write(&val, 1);
+}
+
+size_t File::write(const uint8_t *buf, size_t size) {
+  size_t t;
+  if (!_file) {
+    setWriteError();
+    return 0;
+  }
+  _file->clearWriteError();
+  t = _file->write(buf, size);
+  if (_file->getWriteError()) {
+    setWriteError();
+    return 0;
+  }
+  return t;
+}
+
+int File::peek() {
+  if (! _file) 
+    return 0;
+
+  int c = _file->read();
+  if (c != -1) _file->seekCur(-1);
+  return c;
+}
+
+int File::read() {
+  if (_file) 
+    return _file->read();
+  return -1;
+}
+
+// buffered read for more efficient, high speed reading
+int File::read(void *buf, uint16_t nbyte) {
+  if (_file) 
+    return _file->read(buf, nbyte);
+  return 0;
+}
+
+int File::available() {
+  if (! _file) return 0;
+
+  uint32_t n = size() - position();
+
+  return n > 0X7FFF ? 0X7FFF : n;
+}
+
+void File::flush() {
+  if (_file)
+    _file->sync();
+}
+
+boolean File::seek(uint32_t pos) {
+  if (! _file) return false;
+
+  return _file->seekSet(pos);
+}
+
+uint32_t File::position() {
+  if (! _file) return -1;
+  return _file->curPosition();
+}
+
+uint32_t File::size() {
+  if (! _file) return 0;
+  return _file->fileSize();
+}
+
+void File::close() {
+  if (_file) {
+    _file->close();
+    free(_file); 
+    _file = 0;
+
+    /* for debugging file open/close leaks
+    nfilecount--;
+    Serial.print("Deleted ");
+    Serial.println(nfilecount, DEC);
+    */
+  }
+}
+
+File::operator bool() {
+  if (_file) 
+    return  _file->isOpen();
+  return false;
+}
+

README.md

@@ -0,0 +1,5 @@
+#SD Library#
+
+
+![](http://www.pjrc.com/store/sd_adaptor.jpg)
+

README.txt

@@ -0,0 +1,13 @@
+
+** SD - a slightly more friendly wrapper for sdfatlib **
+
+This library aims to expose a subset of SD card functionality in the
+form of a higher level "wrapper" object.
+
+License: GNU General Public License V3
+         (Because sdfatlib is licensed with this.)
+
+(C) Copyright 2010 SparkFun Electronics
+
+Now better than ever with optimization, multiple file support, directory handling, etc - ladyada!
+

SD.cpp

@@ -0,0 +1,616 @@
+/*
+
+ SD - a slightly more friendly wrapper for sdfatlib
+
+ This library aims to expose a subset of SD card functionality
+ in the form of a higher level "wrapper" object.
+
+ License: GNU General Public License V3
+          (Because sdfatlib is licensed with this.)
+
+ (C) Copyright 2010 SparkFun Electronics
+
+
+ This library provides four key benefits:
+
+   * Including `SD.h` automatically creates a global
+     `SD` object which can be interacted with in a similar
+     manner to other standard global objects like `Serial` and `Ethernet`.
+
+   * Boilerplate initialisation code is contained in one method named 
+     `begin` and no further objects need to be created in order to access
+     the SD card.
+
+   * Calls to `open` can supply a full path name including parent 
+     directories which simplifies interacting with files in subdirectories.
+
+   * Utility methods are provided to determine whether a file exists
+     and to create a directory heirarchy.
+
+
+  Note however that not all functionality provided by the underlying
+  sdfatlib library is exposed.
+
+ */
+
+/*
+
+  Implementation Notes
+
+  In order to handle multi-directory path traversal, functionality that 
+  requires this ability is implemented as callback functions.
+
+  Individual methods call the `walkPath` function which performs the actual
+  directory traversal (swapping between two different directory/file handles
+  along the way) and at each level calls the supplied callback function.
+
+  Some types of functionality will take an action at each level (e.g. exists
+  or make directory) which others will only take an action at the bottom
+  level (e.g. open).
+
+ */
+
+#include "SD.h"
+
+// Used by `getNextPathComponent`
+#define MAX_COMPONENT_LEN 12 // What is max length?
+#define PATH_COMPONENT_BUFFER_LEN MAX_COMPONENT_LEN+1
+
+bool getNextPathComponent(char *path, unsigned int *p_offset,
+			  char *buffer) {
+  /*
+
+    Parse individual path components from a path.
+
+      e.g. after repeated calls '/foo/bar/baz' will be split
+           into 'foo', 'bar', 'baz'.
+
+    This is similar to `strtok()` but copies the component into the
+    supplied buffer rather than modifying the original string.
+
+
+    `buffer` needs to be PATH_COMPONENT_BUFFER_LEN in size.
+
+    `p_offset` needs to point to an integer of the offset at
+    which the previous path component finished.
+
+    Returns `true` if more components remain.
+
+    Returns `false` if this is the last component.
+      (This means path ended with 'foo' or 'foo/'.)
+
+   */
+
+  // TODO: Have buffer local to this function, so we know it's the
+  //       correct length?
+
+  int bufferOffset = 0;
+
+  int offset = *p_offset;
+
+  // Skip root or other separator
+  if (path[offset] == '/') {
+    offset++;
+  }
+  
+  // Copy the next next path segment
+  while (bufferOffset < MAX_COMPONENT_LEN
+	 && (path[offset] != '/')
+	 && (path[offset] != '\0')) {
+    buffer[bufferOffset++] = path[offset++];
+  }
+
+  buffer[bufferOffset] = '\0';
+
+  // Skip trailing separator so we can determine if this
+  // is the last component in the path or not.
+  if (path[offset] == '/') {
+    offset++;
+  }
+
+  *p_offset = offset;
+
+  return (path[offset] != '\0');
+}
+
+
+
+boolean walkPath(char *filepath, SdFile& parentDir,
+		 boolean (*callback)(SdFile& parentDir,
+				     char *filePathComponent,
+				     boolean isLastComponent,
+				     void *object),
+		 void *object = NULL) {
+  /*
+     
+     When given a file path (and parent directory--normally root),
+     this function traverses the directories in the path and at each
+     level calls the supplied callback function while also providing
+     the supplied object for context if required.
+
+       e.g. given the path '/foo/bar/baz'
+            the callback would be called at the equivalent of
+	    '/foo', '/foo/bar' and '/foo/bar/baz'.
+
+     The implementation swaps between two different directory/file
+     handles as it traverses the directories and does not use recursion
+     in an attempt to use memory efficiently.
+
+     If a callback wishes to stop the directory traversal it should
+     return false--in this case the function will stop the traversal,
+     tidy up and return false.
+
+     If a directory path doesn't exist at some point this function will
+     also return false and not subsequently call the callback.
+
+     If a directory path specified is complete, valid and the callback
+     did not indicate the traversal should be interrupted then this
+     function will return true.
+
+   */
+
+
+  SdFile subfile1;
+  SdFile subfile2;
+
+  char buffer[PATH_COMPONENT_BUFFER_LEN]; 
+
+  unsigned int offset = 0;
+
+  SdFile *p_parent;
+  SdFile *p_child;
+
+  SdFile *p_tmp_sdfile;  
+  
+  p_child = &subfile1;
+  
+  p_parent = &parentDir;
+
+  while (true) {
+
+    boolean moreComponents = getNextPathComponent(filepath, &offset, buffer);
+
+    boolean shouldContinue = callback((*p_parent), buffer, !moreComponents, object);
+
+    if (!shouldContinue) {
+      // TODO: Don't repeat this code?
+      // If it's one we've created then we
+      // don't need the parent handle anymore.
+      if (p_parent != &parentDir) {
+        (*p_parent).close();
+      }
+      return false;
+    }
+    
+    if (!moreComponents) {
+      break;
+    }
+    
+    boolean exists = (*p_child).open(*p_parent, buffer, O_RDONLY);
+
+    // If it's one we've created then we
+    // don't need the parent handle anymore.
+    if (p_parent != &parentDir) {
+      (*p_parent).close();
+    }
+    
+    // Handle case when it doesn't exist and we can't continue...
+    if (exists) {
+      // We alternate between two file handles as we go down
+      // the path.
+      if (p_parent == &parentDir) {
+        p_parent = &subfile2;
+      }
+
+      p_tmp_sdfile = p_parent;
+      p_parent = p_child;
+      p_child = p_tmp_sdfile;
+    } else {
+      return false;
+    }
+  }
+  
+  if (p_parent != &parentDir) {
+    (*p_parent).close(); // TODO: Return/ handle different?
+  }
+
+  return true;
+}
+
+
+
+/*
+
+   The callbacks used to implement various functionality follow.
+
+   Each callback is supplied with a parent directory handle,
+   character string with the name of the current file path component,
+   a flag indicating if this component is the last in the path and
+   a pointer to an arbitrary object used for context.
+
+ */
+
+boolean callback_pathExists(SdFile& parentDir, char *filePathComponent, 
+			    boolean isLastComponent, void *object) {
+  /*
+
+    Callback used to determine if a file/directory exists in parent
+    directory.
+
+    Returns true if file path exists.
+
+  */
+  SdFile child;
+
+  boolean exists = child.open(parentDir, filePathComponent, O_RDONLY);
+  
+  if (exists) {
+     child.close(); 
+  }
+  
+  return exists;
+}
+
+
+
+boolean callback_makeDirPath(SdFile& parentDir, char *filePathComponent, 
+			     boolean isLastComponent, void *object) {
+  /*
+
+    Callback used to create a directory in the parent directory if
+    it does not already exist.
+
+    Returns true if a directory was created or it already existed.
+
+  */
+  boolean result = false;
+  SdFile child;
+  
+  result = callback_pathExists(parentDir, filePathComponent, isLastComponent, object);
+  if (!result) {
+    result = child.makeDir(parentDir, filePathComponent);
+  } 
+  
+  return result;
+}
+
+
+  /*
+
+boolean callback_openPath(SdFile& parentDir, char *filePathComponent, 
+			  boolean isLastComponent, void *object) {
+
+    Callback used to open a file specified by a filepath that may
+    specify one or more directories above it.
+
+    Expects the context object to be an instance of `SDClass` and
+    will use the `file` property of the instance to open the requested
+    file/directory with the associated file open mode property.
+
+    Always returns true if the directory traversal hasn't reached the
+    bottom of the directory heirarchy.
+
+    Returns false once the file has been opened--to prevent the traversal
+    from descending further. (This may be unnecessary.)
+
+  if (isLastComponent) {
+    SDClass *p_SD = static_cast<SDClass*>(object);
+    p_SD->file.open(parentDir, filePathComponent, p_SD->fileOpenMode);
+    if (p_SD->fileOpenMode == FILE_WRITE) {
+      p_SD->file.seekSet(p_SD->file.fileSize());
+    }
+    // TODO: Return file open result?
+    return false;
+  }
+  return true;
+}
+  */
+
+
+
+boolean callback_remove(SdFile& parentDir, char *filePathComponent, 
+			boolean isLastComponent, void *object) {
+  if (isLastComponent) {
+    return SdFile::remove(parentDir, filePathComponent);
+  }
+  return true;
+}
+
+boolean callback_rmdir(SdFile& parentDir, char *filePathComponent, 
+			boolean isLastComponent, void *object) {
+  if (isLastComponent) {
+    SdFile f;
+    if (!f.open(parentDir, filePathComponent, O_READ)) return false;
+    return f.rmDir();
+  }
+  return true;
+}
+
+
+
+/* Implementation of class used to create `SDCard` object. */
+
+
+
+boolean SDClass::begin(uint8_t csPin) {
+  /*
+
+    Performs the initialisation required by the sdfatlib library.
+
+    Return true if initialization succeeds, false otherwise.
+
+   */
+  return card.init(SPI_HALF_SPEED, csPin) &&
+         volume.init(card) &&
+         root.openRoot(volume);
+}
+
+
+
+// this little helper is used to traverse paths
+SdFile SDClass::getParentDir(const char *filepath, int *index) {
+  // get parent directory
+  SdFile d1 = root; // start with the mostparent, root!
+  SdFile d2;
+
+  // we'll use the pointers to swap between the two objects
+  SdFile *parent = &d1;
+  SdFile *subdir = &d2;
+  
+  const char *origpath = filepath;
+
+  while (strchr(filepath, '/')) {
+
+    // get rid of leading /'s
+    if (filepath[0] == '/') {
+      filepath++;
+      continue;
+    }
+    
+    if (! strchr(filepath, '/')) {
+      // it was in the root directory, so leave now
+      break;
+    }
+
+    // extract just the name of the next subdirectory
+    uint8_t idx = strchr(filepath, '/') - filepath;
+    if (idx > 12)
+      idx = 12;    // dont let them specify long names
+    char subdirname[13];
+    strncpy(subdirname, filepath, idx);
+    subdirname[idx] = 0;
+
+    // close the subdir (we reuse them) if open
+    subdir->close();
+    if (! subdir->open(parent, subdirname, O_READ)) {
+      // failed to open one of the subdirectories
+      return SdFile();
+    }
+    // move forward to the next subdirectory
+    filepath += idx;
+
+    // we reuse the objects, close it.
+    parent->close();
+
+    // swap the pointers
+    SdFile *t = parent;
+    parent = subdir;
+    subdir = t;
+  }
+
+  *index = (int)(filepath - origpath);
+  // parent is now the parent diretory of the file!
+  return *parent;
+}
+
+
+File SDClass::open(const char *filepath, uint8_t mode) {
+  /*
+
+     Open the supplied file path for reading or writing.
+
+     The file content can be accessed via the `file` property of
+     the `SDClass` object--this property is currently
+     a standard `SdFile` object from `sdfatlib`.
+
+     Defaults to read only.
+
+     If `write` is true, default action (when `append` is true) is to
+     append data to the end of the file.
+
+     If `append` is false then the file will be truncated first.
+
+     If the file does not exist and it is opened for writing the file
+     will be created.
+
+     An attempt to open a file for reading that does not exist is an
+     error.
+
+   */
+
+  int pathidx;
+
+  // do the interative search
+  SdFile parentdir = getParentDir(filepath, &pathidx);
+  // no more subdirs!
+
+  filepath += pathidx;
+
+  if (! filepath[0]) {
+    // it was the directory itself!
+    return File(parentdir, "/");
+  }
+
+  // Open the file itself
+  SdFile file;
+
+  // failed to open a subdir!
+  if (!parentdir.isOpen())
+    return File();
+
+  // there is a special case for the Root directory since its a static dir
+  if (parentdir.isRoot()) {
+    if ( ! file.open(SD.root, filepath, mode)) {
+      // failed to open the file :(
+      return File();
+    }
+    // dont close the root!
+  } else {
+    if ( ! file.open(parentdir, filepath, mode)) {
+      return File();
+    }
+    // close the parent
+    parentdir.close();
+  }
+
+  if (mode & (O_APPEND | O_WRITE)) 
+    file.seekSet(file.fileSize());
+  return File(file, filepath);
+}
+
+
+/*
+File SDClass::open(char *filepath, uint8_t mode) {
+  //
+
+     Open the supplied file path for reading or writing.
+
+     The file content can be accessed via the `file` property of
+     the `SDClass` object--this property is currently
+     a standard `SdFile` object from `sdfatlib`.
+
+     Defaults to read only.
+
+     If `write` is true, default action (when `append` is true) is to
+     append data to the end of the file.
+
+     If `append` is false then the file will be truncated first.
+
+     If the file does not exist and it is opened for writing the file
+     will be created.
+
+     An attempt to open a file for reading that does not exist is an
+     error.
+
+   //
+
+  // TODO: Allow for read&write? (Possibly not, as it requires seek.)
+
+  fileOpenMode = mode;
+  walkPath(filepath, root, callback_openPath, this);
+
+  return File();
+
+}
+*/
+
+
+//boolean SDClass::close() {
+//  /*
+//
+//    Closes the file opened by the `open` method.
+//
+//   */
+//  file.close();
+//}
+
+
+boolean SDClass::exists(char *filepath) {
+  /*
+
+     Returns true if the supplied file path exists.
+
+   */
+  return walkPath(filepath, root, callback_pathExists);
+}
+
+
+//boolean SDClass::exists(char *filepath, SdFile& parentDir) {
+//  /*
+//
+//     Returns true if the supplied file path rooted at `parentDir`
+//     exists.
+//
+//   */
+//  return walkPath(filepath, parentDir, callback_pathExists);
+//}
+
+
+boolean SDClass::mkdir(char *filepath) {
+  /*
+  
+    Makes a single directory or a heirarchy of directories.
+
+    A rough equivalent to `mkdir -p`.
+  
+   */
+  return walkPath(filepath, root, callback_makeDirPath);
+}
+
+boolean SDClass::rmdir(char *filepath) {
+  /*
+  
+    Makes a single directory or a heirarchy of directories.
+
+    A rough equivalent to `mkdir -p`.
+  
+   */
+  return walkPath(filepath, root, callback_rmdir);
+}
+
+boolean SDClass::remove(char *filepath) {
+  return walkPath(filepath, root, callback_remove);
+}
+
+
+// allows you to recurse into a directory
+File File::openNextFile(uint8_t mode) {
+  dir_t p;
+
+  //Serial.print("\t\treading dir...");
+  while (_file->readDir(&p) > 0) {
+
+    // done if past last used entry
+    if (p.name[0] == DIR_NAME_FREE) {
+      //Serial.println("end");
+      return File();
+    }
+
+    // skip deleted entry and entries for . and  ..
+    if (p.name[0] == DIR_NAME_DELETED || p.name[0] == '.') {
+      //Serial.println("dots");
+      continue;
+    }
+
+    // only list subdirectories and files
+    if (!DIR_IS_FILE_OR_SUBDIR(&p)) {
+      //Serial.println("notafile");
+      continue;
+    }
+
+    // print file name with possible blank fill
+    SdFile f;
+    char name[13];
+    _file->dirName(p, name);
+    //Serial.print("try to open file ");
+    //Serial.println(name);
+
+    if (f.open(_file, name, mode)) {
+      //Serial.println("OK!");
+      return File(f, name);    
+    } else {
+      //Serial.println("ugh");
+      return File();
+    }
+  }
+
+  //Serial.println("nothing");
+  return File();
+}
+
+void File::rewindDirectory(void) {  
+  if (isDirectory())
+    _file->rewind();
+}
+
+SDClass SD;

SD.h

@@ -0,0 +1,103 @@
+/*
+
+ SD - a slightly more friendly wrapper for sdfatlib
+
+ This library aims to expose a subset of SD card functionality
+ in the form of a higher level "wrapper" object.
+
+ License: GNU General Public License V3
+          (Because sdfatlib is licensed with this.)
+
+ (C) Copyright 2010 SparkFun Electronics
+
+ */
+
+#ifndef __SD_H__
+#define __SD_H__
+
+#include <Arduino.h>
+
+#include <utility/SdFat.h>
+#include <utility/SdFatUtil.h>
+
+#define FILE_READ O_READ
+#define FILE_WRITE (O_READ | O_WRITE | O_CREAT)
+
+class File : public Stream {
+ private:
+  char _name[13]; // our name
+  SdFile *_file;  // underlying file pointer
+
+public:
+  File(SdFile f, const char *name);     // wraps an underlying SdFile
+  File(void);      // 'empty' constructor
+  ~File(void);     // destructor
+  virtual size_t write(uint8_t);
+  virtual size_t write(const uint8_t *buf, size_t size);
+  virtual int read();
+  virtual int peek();
+  virtual int available();
+  virtual void flush();
+  int read(void *buf, uint16_t nbyte);
+  boolean seek(uint32_t pos);
+  uint32_t position();
+  uint32_t size();
+  void close();
+  operator bool();
+  char * name();
+
+  boolean isDirectory(void);
+  File openNextFile(uint8_t mode = O_RDONLY);
+  void rewindDirectory(void);
+  
+  using Print::write;
+};
+
+class SDClass {
+
+private:
+  // These are required for initialisation and use of sdfatlib
+  Sd2Card card;
+  SdVolume volume;
+  SdFile root;
+  
+  // my quick&dirty iterator, should be replaced
+  SdFile getParentDir(const char *filepath, int *indx);
+public:
+  // This needs to be called to set up the connection to the SD card
+  // before other methods are used.
+  boolean begin(uint8_t csPin = SD_CHIP_SELECT_PIN);
+  
+  // Open the specified file/directory with the supplied mode (e.g. read or
+  // write, etc). Returns a File object for interacting with the file.
+  // Note that currently only one file can be open at a time.
+  File open(const char *filename, uint8_t mode = FILE_READ);
+
+  // Methods to determine if the requested file path exists.
+  boolean exists(char *filepath);
+
+  // Create the requested directory heirarchy--if intermediate directories
+  // do not exist they will be created.
+  boolean mkdir(char *filepath);
+  
+  // Delete the file.
+  boolean remove(char *filepath);
+  
+  boolean rmdir(char *filepath);
+
+private:
+
+  // This is used to determine the mode used to open a file
+  // it's here because it's the easiest place to pass the 
+  // information through the directory walking function. But
+  // it's probably not the best place for it.
+  // It shouldn't be set directly--it is set via the parameters to `open`.
+  int fileOpenMode;
+  
+  friend class File;
+  friend boolean callback_openPath(SdFile&, char *, boolean, void *); 
+};
+
+extern SDClass SD;
+
+#endif

examples/CardInfo/CardInfo.ino

@@ -0,0 +1,117 @@
+/*
+  SD card test 
+   
+ This example shows how use the utility libraries on which the'
+ SD library is based in order to get info about your SD card.
+ Very useful for testing a card when you're not sure whether its working or not.
+ 	
+ The circuit:
+  * SD card attached to SPI bus as follows:
+ ** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila
+ ** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
+ ** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
+ ** CS - depends on your SD card shield or module. 
+ 		Pin 4 used here for consistency with other Arduino examples
+
+ 
+ created  28 Mar 2011
+ by Limor Fried 
+ modified 9 Apr 2012
+ by Tom Igoe
+ */
+ // include the SD library:
+#include <SD.h>
+
+// set up variables using the SD utility library functions:
+Sd2Card card;
+SdVolume volume;
+SdFile root;
+
+// change this to match your SD shield or module;
+// Arduino Ethernet shield: pin 4
+// Adafruit SD shields and modules: pin 10
+// Sparkfun SD shield: pin 8
+const int chipSelect = 4;    
+
+void setup()
+{
+ // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+   while (!Serial) {
+    ; // wait for serial port to connect. Needed for Leonardo only
+  }
+
+
+  Serial.print("\nInitializing SD card...");
+  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
+  // Note that even if it's not used as the CS pin, the hardware SS pin 
+  // (10 on most Arduino boards, 53 on the Mega) must be left as an output 
+  // or the SD library functions will not work. 
+  pinMode(10, OUTPUT);     // change this to 53 on a mega
+
+
+  // we'll use the initialization code from the utility libraries
+  // since we're just testing if the card is working!
+  if (!card.init(SPI_HALF_SPEED, chipSelect)) {
+    Serial.println("initialization failed. Things to check:");
+    Serial.println("* is a card is inserted?");
+    Serial.println("* Is your wiring correct?");
+    Serial.println("* did you change the chipSelect pin to match your shield or module?");
+    return;
+  } else {
+   Serial.println("Wiring is correct and a card is present."); 
+  }
+
+  // print the type of card
+  Serial.print("\nCard type: ");
+  switch(card.type()) {
+    case SD_CARD_TYPE_SD1:
+      Serial.println("SD1");
+      break;
+    case SD_CARD_TYPE_SD2:
+      Serial.println("SD2");
+      break;
+    case SD_CARD_TYPE_SDHC:
+      Serial.println("SDHC");
+      break;
+    default:
+      Serial.println("Unknown");
+  }
+
+  // Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
+  if (!volume.init(card)) {
+    Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
+    return;
+  }
+
+
+  // print the type and size of the first FAT-type volume
+  uint32_t volumesize;
+  Serial.print("\nVolume type is FAT");
+  Serial.println(volume.fatType(), DEC);
+  Serial.println();
+  
+  volumesize = volume.blocksPerCluster();    // clusters are collections of blocks
+  volumesize *= volume.clusterCount();       // we'll have a lot of clusters
+  volumesize *= 512;                            // SD card blocks are always 512 bytes
+  Serial.print("Volume size (bytes): ");
+  Serial.println(volumesize);
+  Serial.print("Volume size (Kbytes): ");
+  volumesize /= 1024;
+  Serial.println(volumesize);
+  Serial.print("Volume size (Mbytes): ");
+  volumesize /= 1024;
+  Serial.println(volumesize);
+
+  
+  Serial.println("\nFiles found on the card (name, date and size in bytes): ");
+  root.openRoot(volume);
+  
+  // list all files in the card with date and size
+  root.ls(LS_R | LS_DATE | LS_SIZE);
+}
+
+
+void loop(void) {
+  
+}

examples/Datalogger/Datalogger.ino

@@ -0,0 +1,92 @@
+/*
+  SD card datalogger
+ 
+ This example shows how to log data from three analog sensors 
+ to an SD card using the SD library.
+ 	
+ The circuit:
+ * analog sensors on analog ins 0, 1, and 2
+ * SD card attached to SPI bus as follows:
+ ** MOSI - pin 11
+ ** MISO - pin 12
+ ** CLK - pin 13
+ ** CS - pin 4
+ 
+ created  24 Nov 2010
+ modified 9 Apr 2012
+ by Tom Igoe
+ 
+ This example code is in the public domain.
+ 	 
+ */
+
+#include <SD.h>
+
+// On the Ethernet Shield, CS is pin 4. Note that even if it's not
+// used as the CS pin, the hardware CS pin (10 on most Arduino boards,
+// 53 on the Mega) must be left as an output or the SD library
+// functions will not work.
+const int chipSelect = 4;
+
+void setup()
+{
+ // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+   while (!Serial) {
+    ; // wait for serial port to connect. Needed for Leonardo only
+  }
+
+
+  Serial.print("Initializing SD card...");
+  // make sure that the default chip select pin is set to
+  // output, even if you don't use it:
+  pinMode(10, OUTPUT);
+  
+  // see if the card is present and can be initialized:
+  if (!SD.begin(chipSelect)) {
+    Serial.println("Card failed, or not present");
+    // don't do anything more:
+    return;
+  }
+  Serial.println("card initialized.");
+}
+
+void loop()
+{
+  // make a string for assembling the data to log:
+  String dataString = "";
+
+  // read three sensors and append to the string:
+  for (int analogPin = 0; analogPin < 3; analogPin++) {
+    int sensor = analogRead(analogPin);
+    dataString += String(sensor);
+    if (analogPin < 2) {
+      dataString += ","; 
+    }
+  }
+
+  // open the file. note that only one file can be open at a time,
+  // so you have to close this one before opening another.
+  File dataFile = SD.open("datalog.txt", FILE_WRITE);
+
+  // if the file is available, write to it:
+  if (dataFile) {
+    dataFile.println(dataString);
+    dataFile.close();
+    // print to the serial port too:
+    Serial.println(dataString);
+  }  
+  // if the file isn't open, pop up an error:
+  else {
+    Serial.println("error opening datalog.txt");
+  } 
+}
+
+
+
+
+
+
+
+
+

examples/DumpFile/DumpFile.ino

@@ -0,0 +1,73 @@
+/*
+  SD card file dump
+ 
+ This example shows how to read a file from the SD card using the
+ SD library and send it over the serial port.
+ 	
+ The circuit:
+ * SD card attached to SPI bus as follows:
+ ** MOSI - pin 11
+ ** MISO - pin 12
+ ** CLK - pin 13
+ ** CS - pin 4
+ 
+ created  22 December 2010
+ by Limor Fried
+ modified 9 Apr 2012
+ by Tom Igoe
+ 
+ This example code is in the public domain.
+ 	 
+ */
+
+#include <SD.h>
+
+// On the Ethernet Shield, CS is pin 4. Note that even if it's not
+// used as the CS pin, the hardware CS pin (10 on most Arduino boards,
+// 53 on the Mega) must be left as an output or the SD library
+// functions will not work.
+const int chipSelect = 4;
+
+void setup()
+{
+ // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+   while (!Serial) {
+    ; // wait for serial port to connect. Needed for Leonardo only
+  }
+
+
+  Serial.print("Initializing SD card...");
+  // make sure that the default chip select pin is set to
+  // output, even if you don't use it:
+  pinMode(10, OUTPUT);
+  
+  // see if the card is present and can be initialized:
+  if (!SD.begin(chipSelect)) {
+    Serial.println("Card failed, or not present");
+    // don't do anything more:
+    return;
+  }
+  Serial.println("card initialized.");
+  
+  // open the file. note that only one file can be open at a time,
+  // so you have to close this one before opening another.
+  File dataFile = SD.open("datalog.txt");
+
+  // if the file is available, write to it:
+  if (dataFile) {
+    while (dataFile.available()) {
+      Serial.write(dataFile.read());
+    }
+    dataFile.close();
+  }  
+  // if the file isn't open, pop up an error:
+  else {
+    Serial.println("error opening datalog.txt");
+  } 
+}
+
+void loop()
+{
+}
+

examples/Files/Files.ino

@@ -0,0 +1,84 @@
+/*
+  SD card basic file example
+ 
+ This example shows how to create and destroy an SD card file 	
+ The circuit:
+ * SD card attached to SPI bus as follows:
+ ** MOSI - pin 11
+ ** MISO - pin 12
+ ** CLK - pin 13
+ ** CS - pin 4
+ 
+ created   Nov 2010
+ by David A. Mellis
+ modified 9 Apr 2012
+ by Tom Igoe
+ 
+ This example code is in the public domain.
+ 	 
+ */
+#include <SD.h>
+
+File myFile;
+
+void setup()
+{
+ // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+   while (!Serial) {
+    ; // wait for serial port to connect. Needed for Leonardo only
+  }
+
+
+  Serial.print("Initializing SD card...");
+  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
+  // Note that even if it's not used as the CS pin, the hardware SS pin 
+  // (10 on most Arduino boards, 53 on the Mega) must be left as an output 
+  // or the SD library functions will not work. 
+  pinMode(10, OUTPUT);
+
+  if (!SD.begin(4)) {
+    Serial.println("initialization failed!");
+    return;
+  }
+  Serial.println("initialization done.");
+
+  if (SD.exists("example.txt")) {
+    Serial.println("example.txt exists.");
+  }
+  else {
+    Serial.println("example.txt doesn't exist.");
+  }
+
+  // open a new file and immediately close it:
+  Serial.println("Creating example.txt...");
+  myFile = SD.open("example.txt", FILE_WRITE);
+  myFile.close();
+
+  // Check to see if the file exists: 
+  if (SD.exists("example.txt")) {
+    Serial.println("example.txt exists.");
+  }
+  else {
+    Serial.println("example.txt doesn't exist.");  
+  }
+
+  // delete the file:
+  Serial.println("Removing example.txt...");
+  SD.remove("example.txt");
+
+  if (SD.exists("example.txt")){ 
+    Serial.println("example.txt exists.");
+  }
+  else {
+    Serial.println("example.txt doesn't exist.");  
+  }
+}
+
+void loop()
+{
+  // nothing happens after setup finishes.
+}
+
+
+

examples/ReadWrite/ReadWrite.ino

@@ -0,0 +1,85 @@
+/*
+  SD card read/write
+ 
+ This example shows how to read and write data to and from an SD card file 	
+ The circuit:
+ * SD card attached to SPI bus as follows:
+ ** MOSI - pin 11
+ ** MISO - pin 12
+ ** CLK - pin 13
+ ** CS - pin 4
+ 
+ created   Nov 2010
+ by David A. Mellis
+ modified 9 Apr 2012
+ by Tom Igoe
+ 
+ This example code is in the public domain.
+ 	 
+ */
+ 
+#include <SD.h>
+
+File myFile;
+
+void setup()
+{
+ // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+   while (!Serial) {
+    ; // wait for serial port to connect. Needed for Leonardo only
+  }
+
+
+  Serial.print("Initializing SD card...");
+  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
+  // Note that even if it's not used as the CS pin, the hardware SS pin 
+  // (10 on most Arduino boards, 53 on the Mega) must be left as an output 
+  // or the SD library functions will not work. 
+   pinMode(10, OUTPUT);
+   
+  if (!SD.begin(4)) {
+    Serial.println("initialization failed!");
+    return;
+  }
+  Serial.println("initialization done.");
+  
+  // open the file. note that only one file can be open at a time,
+  // so you have to close this one before opening another.
+  myFile = SD.open("test.txt", FILE_WRITE);
+  
+  // if the file opened okay, write to it:
+  if (myFile) {
+    Serial.print("Writing to test.txt...");
+    myFile.println("testing 1, 2, 3.");
+	// close the file:
+    myFile.close();
+    Serial.println("done.");
+  } else {
+    // if the file didn't open, print an error:
+    Serial.println("error opening test.txt");
+  }
+  
+  // re-open the file for reading:
+  myFile = SD.open("test.txt");
+  if (myFile) {
+    Serial.println("test.txt:");
+    
+    // read from the file until there's nothing else in it:
+    while (myFile.available()) {
+    	Serial.write(myFile.read());
+    }
+    // close the file:
+    myFile.close();
+  } else {
+  	// if the file didn't open, print an error:
+    Serial.println("error opening test.txt");
+  }
+}
+
+void loop()
+{
+	// nothing happens after setup
+}
+
+

examples/listfiles/listfiles.ino

@@ -0,0 +1,84 @@
+/*
+  SD card basic file example
+ 
+ This example shows how to create and destroy an SD card file 	
+ The circuit:
+ * SD card attached to SPI bus as follows:
+ ** MOSI - pin 11
+ ** MISO - pin 12
+ ** CLK - pin 13
+ ** CS - pin 4
+ 
+ created   Nov 2010
+ by David A. Mellis
+ modified 9 Apr 2012
+ by Tom Igoe
+ 
+ This example code is in the public domain.
+ 	 
+ */
+#include <SD.h>
+
+File root;
+
+void setup()
+{
+  // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+   while (!Serial) {
+    ; // wait for serial port to connect. Needed for Leonardo only
+  }
+
+
+  Serial.print("Initializing SD card...");
+  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
+  // Note that even if it's not used as the CS pin, the hardware SS pin 
+  // (10 on most Arduino boards, 53 on the Mega) must be left as an output 
+  // or the SD library functions will not work. 
+  pinMode(10, OUTPUT);
+
+  if (!SD.begin(10)) {
+    Serial.println("initialization failed!");
+    return;
+  }
+  Serial.println("initialization done.");
+
+  root = SD.open("/");
+  
+  printDirectory(root, 0);
+  
+  Serial.println("done!");
+}
+
+void loop()
+{
+  // nothing happens after setup finishes.
+}
+
+void printDirectory(File dir, int numTabs) {
+   while(true) {
+     
+     File entry =  dir.openNextFile();
+     if (! entry) {
+       // no more files
+       //Serial.println("**nomorefiles**");
+       break;
+     }
+     for (uint8_t i=0; i<numTabs; i++) {
+       Serial.print('\t');
+     }
+     Serial.print(entry.name());
+     if (entry.isDirectory()) {
+       Serial.println("/");
+       printDirectory(entry, numTabs+1);
+     } else {
+       // files have sizes, directories do not
+       Serial.print("\t\t");
+       Serial.println(entry.size(), DEC);
+     }
+     entry.close();
+   }
+}
+
+
+

keywords.txt

@@ -0,0 +1,30 @@
+#######################################
+# Syntax Coloring Map SD
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+
+SD	KEYWORD1
+File	KEYWORD1
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+begin	KEYWORD2
+exists	KEYWORD2
+mkdir	KEYWORD2
+remove	KEYWORD2
+rmdir	KEYWORD2
+open	KEYWORD2
+close	KEYWORD2
+seek	KEYWORD2
+position	KEYWORD2
+size	KEYWORD2	
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+FILE_READ	LITERAL1
+FILE_WRITE	LITERAL1

utility/FatStructs.h

@@ -0,0 +1,418 @@
+/* Arduino SdFat Library
+ * Copyright (C) 2009 by William Greiman
+ *
+ * This file is part of the Arduino SdFat Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino SdFat Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+#ifndef FatStructs_h
+#define FatStructs_h
+/**
+ * \file
+ * FAT file structures
+ */
+/*
+ * mostly from Microsoft document fatgen103.doc
+ * http://www.microsoft.com/whdc/system/platform/firmware/fatgen.mspx
+ */
+//------------------------------------------------------------------------------
+/** Value for byte 510 of boot block or MBR */
+uint8_t const BOOTSIG0 = 0X55;
+/** Value for byte 511 of boot block or MBR */
+uint8_t const BOOTSIG1 = 0XAA;
+//------------------------------------------------------------------------------
+/**
+ * \struct partitionTable
+ * \brief MBR partition table entry
+ *
+ * A partition table entry for a MBR formatted storage device.
+ * The MBR partition table has four entries.
+ */
+struct partitionTable {
+          /**
+           * Boot Indicator . Indicates whether the volume is the active
+           * partition.  Legal values include: 0X00. Do not use for booting.
+           * 0X80 Active partition.
+           */
+  uint8_t  boot;
+          /**
+            * Head part of Cylinder-head-sector address of the first block in
+            * the partition. Legal values are 0-255. Only used in old PC BIOS.
+            */
+  uint8_t  beginHead;
+          /**
+           * Sector part of Cylinder-head-sector address of the first block in
+           * the partition. Legal values are 1-63. Only used in old PC BIOS.
+           */
+  unsigned beginSector : 6;
+           /** High bits cylinder for first block in partition. */
+  unsigned beginCylinderHigh : 2;
+          /**
+           * Combine beginCylinderLow with beginCylinderHigh. Legal values
+           * are 0-1023.  Only used in old PC BIOS.
+           */
+  uint8_t  beginCylinderLow;
+          /**
+           * Partition type. See defines that begin with PART_TYPE_ for
+           * some Microsoft partition types.
+           */
+  uint8_t  type;
+          /**
+           * head part of cylinder-head-sector address of the last sector in the
+           * partition.  Legal values are 0-255. Only used in old PC BIOS.
+           */
+  uint8_t  endHead;
+          /**
+           * Sector part of cylinder-head-sector address of the last sector in
+           * the partition.  Legal values are 1-63. Only used in old PC BIOS.
+           */
+  unsigned endSector : 6;
+           /** High bits of end cylinder */
+  unsigned endCylinderHigh : 2;
+          /**
+           * Combine endCylinderLow with endCylinderHigh. Legal values
+           * are 0-1023.  Only used in old PC BIOS.
+           */
+  uint8_t  endCylinderLow;
+           /** Logical block address of the first block in the partition. */
+  uint32_t firstSector;
+           /** Length of the partition, in blocks. */
+  uint32_t totalSectors;
+};
+/** Type name for partitionTable */
+typedef struct partitionTable part_t;
+//------------------------------------------------------------------------------
+/**
+ * \struct masterBootRecord
+ *
+ * \brief Master Boot Record
+ *
+ * The first block of a storage device that is formatted with a MBR.
+ */
+struct masterBootRecord {
+           /** Code Area for master boot program. */
+  uint8_t  codeArea[440];
+           /** Optional WindowsNT disk signature. May contain more boot code. */
+  uint32_t diskSignature;
+           /** Usually zero but may be more boot code. */
+  uint16_t usuallyZero;
+           /** Partition tables. */
+  part_t   part[4];
+           /** First MBR signature byte. Must be 0X55 */
+  uint8_t  mbrSig0;
+           /** Second MBR signature byte. Must be 0XAA */
+  uint8_t  mbrSig1;
+};
+/** Type name for masterBootRecord */
+typedef struct masterBootRecord mbr_t;
+//------------------------------------------------------------------------------
+/** 
+ * \struct biosParmBlock
+ *
+ * \brief BIOS parameter block
+ * 
+ *  The BIOS parameter block describes the physical layout of a FAT volume.
+ */
+struct biosParmBlock {
+          /**
+           * Count of bytes per sector. This value may take on only the
+           * following values: 512, 1024, 2048 or 4096
+           */
+  uint16_t bytesPerSector;
+          /**
+           * Number of sectors per allocation unit. This value must be a
+           * power of 2 that is greater than 0. The legal values are
+           * 1, 2, 4, 8, 16, 32, 64, and 128.
+           */
+  uint8_t  sectorsPerCluster;
+          /**
+           * Number of sectors before the first FAT.
+           * This value must not be zero.
+           */
+  uint16_t reservedSectorCount;
+          /** The count of FAT data structures on the volume. This field should
+           *  always contain the value 2 for any FAT volume of any type.
+           */
+  uint8_t  fatCount;
+          /**
+          * For FAT12 and FAT16 volumes, this field contains the count of
+          * 32-byte directory entries in the root directory. For FAT32 volumes,
+          * this field must be set to 0. For FAT12 and FAT16 volumes, this
+          * value should always specify a count that when multiplied by 32
+          * results in a multiple of bytesPerSector.  FAT16 volumes should
+          * use the value 512.
+          */
+  uint16_t rootDirEntryCount;
+          /**
+           * This field is the old 16-bit total count of sectors on the volume.
+           * This count includes the count of all sectors in all four regions
+           * of the volume. This field can be 0; if it is 0, then totalSectors32
+           * must be non-zero.  For FAT32 volumes, this field must be 0. For
+           * FAT12 and FAT16 volumes, this field contains the sector count, and
+           * totalSectors32 is 0 if the total sector count fits
+           * (is less than 0x10000).
+           */
+  uint16_t totalSectors16;
+          /**
+           * This dates back to the old MS-DOS 1.x media determination and is
+           * no longer usually used for anything.  0xF8 is the standard value
+           * for fixed (non-removable) media. For removable media, 0xF0 is
+           * frequently used. Legal values are 0xF0 or 0xF8-0xFF.
+           */
+  uint8_t  mediaType;
+          /**
+           * Count of sectors occupied by one FAT on FAT12/FAT16 volumes.
+           * On FAT32 volumes this field must be 0, and sectorsPerFat32
+           * contains the FAT size count.
+           */
+  uint16_t sectorsPerFat16;
+           /** Sectors per track for interrupt 0x13. Not used otherwise. */
+  uint16_t sectorsPerTrtack;
+           /** Number of heads for interrupt 0x13.  Not used otherwise. */
+  uint16_t headCount;
+          /**
+           * Count of hidden sectors preceding the partition that contains this
+           * FAT volume. This field is generally only relevant for media
+           *  visible on interrupt 0x13.
+           */
+  uint32_t hidddenSectors;
+          /**
+           * This field is the new 32-bit total count of sectors on the volume.
+           * This count includes the count of all sectors in all four regions
+           * of the volume.  This field can be 0; if it is 0, then
+           * totalSectors16 must be non-zero.
+           */
+  uint32_t totalSectors32;
+          /**
+           * Count of sectors occupied by one FAT on FAT32 volumes.
+           */
+  uint32_t sectorsPerFat32;
+          /**
+           * This field is only defined for FAT32 media and does not exist on
+           * FAT12 and FAT16 media.
+           * Bits 0-3 -- Zero-based number of active FAT.
+           *             Only valid if mirroring is disabled.
+           * Bits 4-6 -- Reserved.
+           * Bit 7	-- 0 means the FAT is mirrored at runtime into all FATs.
+	         *        -- 1 means only one FAT is active; it is the one referenced in bits 0-3.
+           * Bits 8-15 	-- Reserved.
+           */
+  uint16_t fat32Flags;
+          /**
+           * FAT32 version. High byte is major revision number.
+           * Low byte is minor revision number. Only 0.0 define.
+           */
+  uint16_t fat32Version;
+          /**
+           * Cluster number of the first cluster of the root directory for FAT32.
+           * This usually 2 but not required to be 2.
+           */
+  uint32_t fat32RootCluster;
+          /**
+           * Sector number of FSINFO structure in the reserved area of the
+           * FAT32 volume. Usually 1.
+           */
+  uint16_t fat32FSInfo;
+          /**
+           * If non-zero, indicates the sector number in the reserved area
+           * of the volume of a copy of the boot record. Usually 6.
+           * No value other than 6 is recommended.
+           */
+  uint16_t fat32BackBootBlock;
+          /**
+           * Reserved for future expansion. Code that formats FAT32 volumes
+           * should always set all of the bytes of this field to 0.
+           */
+  uint8_t  fat32Reserved[12];
+};
+/** Type name for biosParmBlock */
+typedef struct biosParmBlock bpb_t;
+//------------------------------------------------------------------------------
+/**
+ * \struct fat32BootSector
+ *
+ * \brief Boot sector for a FAT16 or FAT32 volume.
+ * 
+ */  
+struct fat32BootSector {
+           /** X86 jmp to boot program */
+  uint8_t  jmpToBootCode[3];
+           /** informational only - don't depend on it */
+  char     oemName[8];
+           /** BIOS Parameter Block */
+  bpb_t    bpb;
+           /** for int0x13 use value 0X80 for hard drive */
+  uint8_t  driveNumber;
+           /** used by Windows NT - should be zero for FAT */
+  uint8_t  reserved1;
+           /** 0X29 if next three fields are valid */
+  uint8_t  bootSignature;
+           /** usually generated by combining date and time */
+  uint32_t volumeSerialNumber;
+           /** should match volume label in root dir */
+  char     volumeLabel[11];
+           /** informational only - don't depend on it */
+  char     fileSystemType[8];
+           /** X86 boot code */
+  uint8_t  bootCode[420];
+           /** must be 0X55 */
+  uint8_t  bootSectorSig0;
+           /** must be 0XAA */
+  uint8_t  bootSectorSig1;
+};
+//------------------------------------------------------------------------------
+// End Of Chain values for FAT entries
+/** FAT16 end of chain value used by Microsoft. */
+uint16_t const FAT16EOC = 0XFFFF;
+/** Minimum value for FAT16 EOC.  Use to test for EOC. */
+uint16_t const FAT16EOC_MIN = 0XFFF8;
+/** FAT32 end of chain value used by Microsoft. */
+uint32_t const FAT32EOC = 0X0FFFFFFF;
+/** Minimum value for FAT32 EOC.  Use to test for EOC. */
+uint32_t const FAT32EOC_MIN = 0X0FFFFFF8;
+/** Mask a for FAT32 entry. Entries are 28 bits. */
+uint32_t const FAT32MASK = 0X0FFFFFFF;
+
+/** Type name for fat32BootSector */
+typedef struct fat32BootSector fbs_t;
+//------------------------------------------------------------------------------
+/**
+ * \struct directoryEntry
+ * \brief FAT short directory entry
+ *
+ * Short means short 8.3 name, not the entry size.
+ *  
+ * Date Format. A FAT directory entry date stamp is a 16-bit field that is 
+ * basically a date relative to the MS-DOS epoch of 01/01/1980. Here is the
+ * format (bit 0 is the LSB of the 16-bit word, bit 15 is the MSB of the 
+ * 16-bit word):
+ *   
+ * Bits 9-15: Count of years from 1980, valid value range 0-127 
+ * inclusive (1980-2107).
+ *   
+ * Bits 5-8: Month of year, 1 = January, valid value range 1-12 inclusive.
+ *
+ * Bits 0-4: Day of month, valid value range 1-31 inclusive.
+ *
+ * Time Format. A FAT directory entry time stamp is a 16-bit field that has
+ * a granularity of 2 seconds. Here is the format (bit 0 is the LSB of the 
+ * 16-bit word, bit 15 is the MSB of the 16-bit word).
+ *   
+ * Bits 11-15: Hours, valid value range 0-23 inclusive.
+ * 
+ * Bits 5-10: Minutes, valid value range 0-59 inclusive.
+ *      
+ * Bits 0-4: 2-second count, valid value range 0-29 inclusive (0 - 58 seconds).
+ *   
+ * The valid time range is from Midnight 00:00:00 to 23:59:58.
+ */
+struct directoryEntry {
+           /**
+            * Short 8.3 name.
+            * The first eight bytes contain the file name with blank fill.
+            * The last three bytes contain the file extension with blank fill.
+            */
+  uint8_t  name[11];
+          /** Entry attributes.
+           *
+           * The upper two bits of the attribute byte are reserved and should
+           * always be set to 0 when a file is created and never modified or
+           * looked at after that.  See defines that begin with DIR_ATT_.
+           */
+  uint8_t  attributes;
+          /**
+           * Reserved for use by Windows NT. Set value to 0 when a file is
+           * created and never modify or look at it after that.
+           */
+  uint8_t  reservedNT;
+          /**
+           * The granularity of the seconds part of creationTime is 2 seconds
+           * so this field is a count of tenths of a second and its valid
+           * value range is 0-199 inclusive. (WHG note - seems to be hundredths)
+           */
+  uint8_t  creationTimeTenths;
+           /** Time file was created. */
+  uint16_t creationTime;
+           /** Date file was created. */
+  uint16_t creationDate;
+          /**
+           * Last access date. Note that there is no last access time, only
+           * a date.  This is the date of last read or write. In the case of
+           * a write, this should be set to the same date as lastWriteDate.
+           */
+  uint16_t lastAccessDate;
+          /**
+           * High word of this entry's first cluster number (always 0 for a
+           * FAT12 or FAT16 volume).
+           */
+  uint16_t firstClusterHigh;
+           /** Time of last write. File creation is considered a write. */
+  uint16_t lastWriteTime;
+           /** Date of last write. File creation is considered a write. */
+  uint16_t lastWriteDate;
+           /** Low word of this entry's first cluster number. */
+  uint16_t firstClusterLow;
+           /** 32-bit unsigned holding this file's size in bytes. */
+  uint32_t fileSize;
+};
+//------------------------------------------------------------------------------
+// Definitions for directory entries
+//
+/** Type name for directoryEntry */
+typedef struct directoryEntry dir_t;
+/** escape for name[0] = 0XE5 */
+uint8_t const DIR_NAME_0XE5 = 0X05;
+/** name[0] value for entry that is free after being "deleted" */
+uint8_t const DIR_NAME_DELETED = 0XE5;
+/** name[0] value for entry that is free and no allocated entries follow */
+uint8_t const DIR_NAME_FREE = 0X00;
+/** file is read-only */
+uint8_t const DIR_ATT_READ_ONLY = 0X01;
+/** File should hidden in directory listings */
+uint8_t const DIR_ATT_HIDDEN = 0X02;
+/** Entry is for a system file */
+uint8_t const DIR_ATT_SYSTEM = 0X04;
+/** Directory entry contains the volume label */
+uint8_t const DIR_ATT_VOLUME_ID = 0X08;
+/** Entry is for a directory */
+uint8_t const DIR_ATT_DIRECTORY = 0X10;
+/** Old DOS archive bit for backup support */
+uint8_t const DIR_ATT_ARCHIVE = 0X20;
+/** Test value for long name entry.  Test is
+  (d->attributes & DIR_ATT_LONG_NAME_MASK) == DIR_ATT_LONG_NAME. */
+uint8_t const DIR_ATT_LONG_NAME = 0X0F;
+/** Test mask for long name entry */
+uint8_t const DIR_ATT_LONG_NAME_MASK = 0X3F;
+/** defined attribute bits */
+uint8_t const DIR_ATT_DEFINED_BITS = 0X3F;
+/** Directory entry is part of a long name */
+static inline uint8_t DIR_IS_LONG_NAME(const dir_t* dir) {
+  return (dir->attributes & DIR_ATT_LONG_NAME_MASK) == DIR_ATT_LONG_NAME;
+}
+/** Mask for file/subdirectory tests */
+uint8_t const DIR_ATT_FILE_TYPE_MASK = (DIR_ATT_VOLUME_ID | DIR_ATT_DIRECTORY);
+/** Directory entry is for a file */
+static inline uint8_t DIR_IS_FILE(const dir_t* dir) {
+  return (dir->attributes & DIR_ATT_FILE_TYPE_MASK) == 0;
+}
+/** Directory entry is for a subdirectory */
+static inline uint8_t DIR_IS_SUBDIR(const dir_t* dir) {
+  return (dir->attributes & DIR_ATT_FILE_TYPE_MASK) == DIR_ATT_DIRECTORY;
+}
+/** Directory entry is for a file or subdirectory */
+static inline uint8_t DIR_IS_FILE_OR_SUBDIR(const dir_t* dir) {
+  return (dir->attributes & DIR_ATT_VOLUME_ID) == 0;
+}
+#endif  // FatStructs_h

utility/Sd2Card.cpp

@@ -0,0 +1,644 @@
+/* Arduino Sd2Card Library
+ * Copyright (C) 2009 by William Greiman
+ *
+ * This file is part of the Arduino Sd2Card Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino Sd2Card Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+#include <Arduino.h>
+#include "Sd2Card.h"
+//------------------------------------------------------------------------------
+#ifndef SOFTWARE_SPI
+// functions for hardware SPI
+/** Send a byte to the card */
+static void spiSend(uint8_t b) {
+  SPDR = b;
+  while (!(SPSR & (1 << SPIF)));
+}
+/** Receive a byte from the card */
+static  uint8_t spiRec(void) {
+  spiSend(0XFF);
+  return SPDR;
+}
+#else  // SOFTWARE_SPI
+//------------------------------------------------------------------------------
+/** nop to tune soft SPI timing */
+#define nop asm volatile ("nop\n\t")
+//------------------------------------------------------------------------------
+/** Soft SPI receive */
+uint8_t spiRec(void) {
+  uint8_t data = 0;
+  // no interrupts during byte receive - about 8 us
+  cli();
+  // output pin high - like sending 0XFF
+  fastDigitalWrite(SPI_MOSI_PIN, HIGH);
+
+  for (uint8_t i = 0; i < 8; i++) {
+    fastDigitalWrite(SPI_SCK_PIN, HIGH);
+
+    // adjust so SCK is nice
+    nop;
+    nop;
+
+    data <<= 1;
+
+    if (fastDigitalRead(SPI_MISO_PIN)) data |= 1;
+
+    fastDigitalWrite(SPI_SCK_PIN, LOW);
+  }
+  // enable interrupts
+  sei();
+  return data;
+}
+//------------------------------------------------------------------------------
+/** Soft SPI send */
+void spiSend(uint8_t data) {
+  // no interrupts during byte send - about 8 us
+  cli();
+  for (uint8_t i = 0; i < 8; i++) {
+    fastDigitalWrite(SPI_SCK_PIN, LOW);
+
+    fastDigitalWrite(SPI_MOSI_PIN, data & 0X80);
+
+    data <<= 1;
+
+    fastDigitalWrite(SPI_SCK_PIN, HIGH);
+  }
+  // hold SCK high for a few ns
+  nop;
+  nop;
+  nop;
+  nop;
+
+  fastDigitalWrite(SPI_SCK_PIN, LOW);
+  // enable interrupts
+  sei();
+}
+#endif  // SOFTWARE_SPI
+//------------------------------------------------------------------------------
+// send command and return error code.  Return zero for OK
+uint8_t Sd2Card::cardCommand(uint8_t cmd, uint32_t arg) {
+  // end read if in partialBlockRead mode
+  readEnd();
+
+  // select card
+  chipSelectLow();
+
+  // wait up to 300 ms if busy
+  waitNotBusy(300);
+
+  // send command
+  spiSend(cmd | 0x40);
+
+  // send argument
+  for (int8_t s = 24; s >= 0; s -= 8) spiSend(arg >> s);
+
+  // send CRC
+  uint8_t crc = 0XFF;
+  if (cmd == CMD0) crc = 0X95;  // correct crc for CMD0 with arg 0
+  if (cmd == CMD8) crc = 0X87;  // correct crc for CMD8 with arg 0X1AA
+  spiSend(crc);
+
+  // wait for response
+  for (uint8_t i = 0; ((status_ = spiRec()) & 0X80) && i != 0XFF; i++);
+  return status_;
+}
+//------------------------------------------------------------------------------
+/**
+ * Determine the size of an SD flash memory card.
+ *
+ * \return The number of 512 byte data blocks in the card
+ *         or zero if an error occurs.
+ */
+uint32_t Sd2Card::cardSize(void) {
+  csd_t csd;
+  if (!readCSD(&csd)) return 0;
+  if (csd.v1.csd_ver == 0) {
+    uint8_t read_bl_len = csd.v1.read_bl_len;
+    uint16_t c_size = (csd.v1.c_size_high << 10)
+                      | (csd.v1.c_size_mid << 2) | csd.v1.c_size_low;
+    uint8_t c_size_mult = (csd.v1.c_size_mult_high << 1)
+                          | csd.v1.c_size_mult_low;
+    return (uint32_t)(c_size + 1) << (c_size_mult + read_bl_len - 7);
+  } else if (csd.v2.csd_ver == 1) {
+    uint32_t c_size = ((uint32_t)csd.v2.c_size_high << 16)
+                      | (csd.v2.c_size_mid << 8) | csd.v2.c_size_low;
+    return (c_size + 1) << 10;
+  } else {
+    error(SD_CARD_ERROR_BAD_CSD);
+    return 0;
+  }
+}
+//------------------------------------------------------------------------------
+void Sd2Card::chipSelectHigh(void) {
+  digitalWrite(chipSelectPin_, HIGH);
+}
+//------------------------------------------------------------------------------
+void Sd2Card::chipSelectLow(void) {
+  digitalWrite(chipSelectPin_, LOW);
+}
+//------------------------------------------------------------------------------
+/** Erase a range of blocks.
+ *
+ * \param[in] firstBlock The address of the first block in the range.
+ * \param[in] lastBlock The address of the last block in the range.
+ *
+ * \note This function requests the SD card to do a flash erase for a
+ * range of blocks.  The data on the card after an erase operation is
+ * either 0 or 1, depends on the card vendor.  The card must support
+ * single block erase.
+ *
+ * \return The value one, true, is returned for success and
+ * the value zero, false, is returned for failure.
+ */
+uint8_t Sd2Card::erase(uint32_t firstBlock, uint32_t lastBlock) {
+  if (!eraseSingleBlockEnable()) {
+    error(SD_CARD_ERROR_ERASE_SINGLE_BLOCK);
+    goto fail;
+  }
+  if (type_ != SD_CARD_TYPE_SDHC) {
+    firstBlock <<= 9;
+    lastBlock <<= 9;
+  }
+  if (cardCommand(CMD32, firstBlock)
+    || cardCommand(CMD33, lastBlock)
+    || cardCommand(CMD38, 0)) {
+      error(SD_CARD_ERROR_ERASE);
+      goto fail;
+  }
+  if (!waitNotBusy(SD_ERASE_TIMEOUT)) {
+    error(SD_CARD_ERROR_ERASE_TIMEOUT);
+    goto fail;
+  }
+  chipSelectHigh();
+  return true;
+
+ fail:
+  chipSelectHigh();
+  return false;
+}
+//------------------------------------------------------------------------------
+/** Determine if card supports single block erase.
+ *
+ * \return The value one, true, is returned if single block erase is supported.
+ * The value zero, false, is returned if single block erase is not supported.
+ */
+uint8_t Sd2Card::eraseSingleBlockEnable(void) {
+  csd_t csd;
+  return readCSD(&csd) ? csd.v1.erase_blk_en : 0;
+}
+//------------------------------------------------------------------------------
+/**
+ * Initialize an SD flash memory card.
+ *
+ * \param[in] sckRateID SPI clock rate selector. See setSckRate().
+ * \param[in] chipSelectPin SD chip select pin number.
+ *
+ * \return The value one, true, is returned for success and
+ * the value zero, false, is returned for failure.  The reason for failure
+ * can be determined by calling errorCode() and errorData().
+ */
+uint8_t Sd2Card::init(uint8_t sckRateID, uint8_t chipSelectPin) {
+  errorCode_ = inBlock_ = partialBlockRead_ = type_ = 0;
+  chipSelectPin_ = chipSelectPin;
+  // 16-bit init start time allows over a minute
+  uint16_t t0 = (uint16_t)millis();
+  uint32_t arg;
+
+  // set pin modes
+  pinMode(chipSelectPin_, OUTPUT);
+  chipSelectHigh();
+  pinMode(SPI_MISO_PIN, INPUT);
+  pinMode(SPI_MOSI_PIN, OUTPUT);
+  pinMode(SPI_SCK_PIN, OUTPUT);
+
+#ifndef SOFTWARE_SPI
+  // SS must be in output mode even it is not chip select
+  pinMode(SS_PIN, OUTPUT);
+  digitalWrite(SS_PIN, HIGH); // disable any SPI device using hardware SS pin
+  // Enable SPI, Master, clock rate f_osc/128
+  SPCR = (1 << SPE) | (1 << MSTR) | (1 << SPR1) | (1 << SPR0);
+  // clear double speed
+  SPSR &= ~(1 << SPI2X);
+#endif  // SOFTWARE_SPI
+
+  // must supply min of 74 clock cycles with CS high.
+  for (uint8_t i = 0; i < 10; i++) spiSend(0XFF);
+
+  chipSelectLow();
+
+  // command to go idle in SPI mode
+  while ((status_ = cardCommand(CMD0, 0)) != R1_IDLE_STATE) {
+    if (((uint16_t)millis() - t0) > SD_INIT_TIMEOUT) {
+      error(SD_CARD_ERROR_CMD0);
+      goto fail;
+    }
+  }
+  // check SD version
+  if ((cardCommand(CMD8, 0x1AA) & R1_ILLEGAL_COMMAND)) {
+    type(SD_CARD_TYPE_SD1);
+  } else {
+    // only need last byte of r7 response
+    for (uint8_t i = 0; i < 4; i++) status_ = spiRec();
+    if (status_ != 0XAA) {
+      error(SD_CARD_ERROR_CMD8);
+      goto fail;
+    }
+    type(SD_CARD_TYPE_SD2);
+  }
+  // initialize card and send host supports SDHC if SD2
+  arg = type() == SD_CARD_TYPE_SD2 ? 0X40000000 : 0;
+
+  while ((status_ = cardAcmd(ACMD41, arg)) != R1_READY_STATE) {
+    // check for timeout
+    if (((uint16_t)millis() - t0) > SD_INIT_TIMEOUT) {
+      error(SD_CARD_ERROR_ACMD41);
+      goto fail;
+    }
+  }
+  // if SD2 read OCR register to check for SDHC card
+  if (type() == SD_CARD_TYPE_SD2) {
+    if (cardCommand(CMD58, 0)) {
+      error(SD_CARD_ERROR_CMD58);
+      goto fail;
+    }
+    if ((spiRec() & 0XC0) == 0XC0) type(SD_CARD_TYPE_SDHC);
+    // discard rest of ocr - contains allowed voltage range
+    for (uint8_t i = 0; i < 3; i++) spiRec();
+  }
+  chipSelectHigh();
+
+#ifndef SOFTWARE_SPI
+  return setSckRate(sckRateID);
+#else  // SOFTWARE_SPI
+  return true;
+#endif  // SOFTWARE_SPI
+
+ fail:
+  chipSelectHigh();
+  return false;
+}
+//------------------------------------------------------------------------------
+/**
+ * Enable or disable partial block reads.
+ *
+ * Enabling partial block reads improves performance by allowing a block
+ * to be read over the SPI bus as several sub-blocks.  Errors may occur
+ * if the time between reads is too long since the SD card may timeout.
+ * The SPI SS line will be held low until the entire block is read or
+ * readEnd() is called.
+ *
+ * Use this for applications like the Adafruit Wave Shield.
+ *
+ * \param[in] value The value TRUE (non-zero) or FALSE (zero).)
+ */
+void Sd2Card::partialBlockRead(uint8_t value) {
+  readEnd();
+  partialBlockRead_ = value;
+}
+//------------------------------------------------------------------------------
+/**
+ * Read a 512 byte block from an SD card device.
+ *
+ * \param[in] block Logical block to be read.
+ * \param[out] dst Pointer to the location that will receive the data.
+
+ * \return The value one, true, is returned for success and
+ * the value zero, false, is returned for failure.
+ */
+uint8_t Sd2Card::readBlock(uint32_t block, uint8_t* dst) {
+  return readData(block, 0, 512, dst);
+}
+//------------------------------------------------------------------------------
+/**
+ * Read part of a 512 byte block from an SD card.
+ *
+ * \param[in] block Logical block to be read.
+ * \param[in] offset Number of bytes to skip at start of block
+ * \param[out] dst Pointer to the location that will receive the data.
+ * \param[in] count Number of bytes to read
+ * \return The value one, true, is returned for success and
+ * the value zero, false, is returned for failure.
+ */
+uint8_t Sd2Card::readData(uint32_t block,
+        uint16_t offset, uint16_t count, uint8_t* dst) {
+  uint16_t n;
+  if (count == 0) return true;
+  if ((count + offset) > 512) {
+    goto fail;
+  }
+  if (!inBlock_ || block != block_ || offset < offset_) {
+    block_ = block;
+    // use address if not SDHC card
+    if (type()!= SD_CARD_TYPE_SDHC) block <<= 9;
+    if (cardCommand(CMD17, block)) {
+      error(SD_CARD_ERROR_CMD17);
+      goto fail;
+    }
+    if (!waitStartBlock()) {
+      goto fail;
+    }
+    offset_ = 0;
+    inBlock_ = 1;
+  }
+
+#ifdef OPTIMIZE_HARDWARE_SPI
+  // start first spi transfer
+  SPDR = 0XFF;
+
+  // skip data before offset
+  for (;offset_ < offset; offset_++) {
+    while (!(SPSR & (1 << SPIF)));
+    SPDR = 0XFF;
+  }
+  // transfer data
+  n = count - 1;
+  for (uint16_t i = 0; i < n; i++) {
+    while (!(SPSR & (1 << SPIF)));
+    dst[i] = SPDR;
+    SPDR = 0XFF;
+  }
+  // wait for last byte
+  while (!(SPSR & (1 << SPIF)));
+  dst[n] = SPDR;
+
+#else  // OPTIMIZE_HARDWARE_SPI
+
+  // skip data before offset
+  for (;offset_ < offset; offset_++) {
+    spiRec();
+  }
+  // transfer data
+  for (uint16_t i = 0; i < count; i++) {
+    dst[i] = spiRec();
+  }
+#endif  // OPTIMIZE_HARDWARE_SPI
+
+  offset_ += count;
+  if (!partialBlockRead_ || offset_ >= 512) {
+    // read rest of data, checksum and set chip select high
+    readEnd();
+  }
+  return true;
+
+ fail:
+  chipSelectHigh();
+  return false;
+}
+//------------------------------------------------------------------------------
+/** Skip remaining data in a block when in partial block read mode. */
+void Sd2Card::readEnd(void) {
+  if (inBlock_) {
+      // skip data and crc
+#ifdef OPTIMIZE_HARDWARE_SPI
+    // optimize skip for hardware
+    SPDR = 0XFF;
+    while (offset_++ < 513) {
+      while (!(SPSR & (1 << SPIF)));
+      SPDR = 0XFF;
+    }
+    // wait for last crc byte
+    while (!(SPSR & (1 << SPIF)));
+#else  // OPTIMIZE_HARDWARE_SPI
+    while (offset_++ < 514) spiRec();
+#endif  // OPTIMIZE_HARDWARE_SPI
+    chipSelectHigh();
+    inBlock_ = 0;
+  }
+}
+//------------------------------------------------------------------------------
+/** read CID or CSR register */
+uint8_t Sd2Card::readRegister(uint8_t cmd, void* buf) {
+  uint8_t* dst = reinterpret_cast<uint8_t*>(buf);
+  if (cardCommand(cmd, 0)) {
+    error(SD_CARD_ERROR_READ_REG);
+    goto fail;
+  }
+  if (!waitStartBlock()) goto fail;
+  // transfer data
+  for (uint16_t i = 0; i < 16; i++) dst[i] = spiRec();
+  spiRec();  // get first crc byte
+  spiRec();  // get second crc byte
+  chipSelectHigh();
+  return true;
+
+ fail:
+  chipSelectHigh();
+  return false;
+}
+//------------------------------------------------------------------------------
+/**
+ * Set the SPI clock rate.
+ *
+ * \param[in] sckRateID A value in the range [0, 6].
+ *
+ * The SPI clock will be set to F_CPU/pow(2, 1 + sckRateID). The maximum
+ * SPI rate is F_CPU/2 for \a sckRateID = 0 and the minimum rate is F_CPU/128
+ * for \a scsRateID = 6.
+ *
+ * \return The value one, true, is returned for success and the value zero,
+ * false, is returned for an invalid value of \a sckRateID.
+ */
+uint8_t Sd2Card::setSckRate(uint8_t sckRateID) {
+  if (sckRateID > 6) {
+    error(SD_CARD_ERROR_SCK_RATE);
+    return false;
+  }
+  // see avr processor datasheet for SPI register bit definitions
+  if ((sckRateID & 1) || sckRateID == 6) {
+    SPSR &= ~(1 << SPI2X);
+  } else {
+    SPSR |= (1 << SPI2X);
+  }
+  SPCR &= ~((1 <<SPR1) | (1 << SPR0));
+  SPCR |= (sckRateID & 4 ? (1 << SPR1) : 0)
+    | (sckRateID & 2 ? (1 << SPR0) : 0);
+  return true;
+}
+//------------------------------------------------------------------------------
+// wait for card to go not busy
+uint8_t Sd2Card::waitNotBusy(uint16_t timeoutMillis) {
+  uint16_t t0 = millis();
+  do {
+    if (spiRec() == 0XFF) return true;
+  }
+  while (((uint16_t)millis() - t0) < timeoutMillis);
+  return false;
+}
+//------------------------------------------------------------------------------
+/** Wait for start block token */
+uint8_t Sd2Card::waitStartBlock(void) {
+  uint16_t t0 = millis();
+  while ((status_ = spiRec()) == 0XFF) {
+    if (((uint16_t)millis() - t0) > SD_READ_TIMEOUT) {
+      error(SD_CARD_ERROR_READ_TIMEOUT);
+      goto fail;
+    }
+  }
+  if (status_ != DATA_START_BLOCK) {
+    error(SD_CARD_ERROR_READ);
+    goto fail;
+  }
+  return true;
+
+ fail:
+  chipSelectHigh();
+  return false;
+}
+//------------------------------------------------------------------------------
+/**
+ * Writes a 512 byte block to an SD card.
+ *
+ * \param[in] blockNumber Logical block to be written.
+ * \param[in] src Pointer to the location of the data to be written.
+ * \return The value one, true, is returned for success and
+ * the value zero, false, is returned for failure.
+ */
+uint8_t Sd2Card::writeBlock(uint32_t blockNumber, const uint8_t* src) {
+#if SD_PROTECT_BLOCK_ZERO
+  // don't allow write to first block
+  if (blockNumber == 0) {
+    error(SD_CARD_ERROR_WRITE_BLOCK_ZERO);
+    goto fail;
+  }
+#endif  // SD_PROTECT_BLOCK_ZERO
+
+  // use address if not SDHC card
+  if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;
+  if (cardCommand(CMD24, blockNumber)) {
+    error(SD_CARD_ERROR_CMD24);
+    goto fail;
+  }
+  if (!writeData(DATA_START_BLOCK, src)) goto fail;
+
+  // wait for flash programming to complete
+  if (!waitNotBusy(SD_WRITE_TIMEOUT)) {
+    error(SD_CARD_ERROR_WRITE_TIMEOUT);
+    goto fail;
+  }
+  // response is r2 so get and check two bytes for nonzero
+  if (cardCommand(CMD13, 0) || spiRec()) {
+    error(SD_CARD_ERROR_WRITE_PROGRAMMING);
+    goto fail;
+  }
+  chipSelectHigh();
+  return true;
+
+ fail:
+  chipSelectHigh();
+  return false;
+}
+//------------------------------------------------------------------------------
+/** Write one data block in a multiple block write sequence */
+uint8_t Sd2Card::writeData(const uint8_t* src) {
+  // wait for previous write to finish
+  if (!waitNotBusy(SD_WRITE_TIMEOUT)) {
+    error(SD_CARD_ERROR_WRITE_MULTIPLE);
+    chipSelectHigh();
+    return false;
+  }
+  return writeData(WRITE_MULTIPLE_TOKEN, src);
+}
+//------------------------------------------------------------------------------
+// send one block of data for write block or write multiple blocks
+uint8_t Sd2Card::writeData(uint8_t token, const uint8_t* src) {
+#ifdef OPTIMIZE_HARDWARE_SPI
+
+  // send data - optimized loop
+  SPDR = token;
+
+  // send two byte per iteration
+  for (uint16_t i = 0; i < 512; i += 2) {
+    while (!(SPSR & (1 << SPIF)));
+    SPDR = src[i];
+    while (!(SPSR & (1 << SPIF)));
+    SPDR = src[i+1];
+  }
+
+  // wait for last data byte
+  while (!(SPSR & (1 << SPIF)));
+
+#else  // OPTIMIZE_HARDWARE_SPI
+  spiSend(token);
+  for (uint16_t i = 0; i < 512; i++) {
+    spiSend(src[i]);
+  }
+#endif  // OPTIMIZE_HARDWARE_SPI
+  spiSend(0xff);  // dummy crc
+  spiSend(0xff);  // dummy crc
+
+  status_ = spiRec();
+  if ((status_ & DATA_RES_MASK) != DATA_RES_ACCEPTED) {
+    error(SD_CARD_ERROR_WRITE);
+    chipSelectHigh();
+    return false;
+  }
+  return true;
+}
+//------------------------------------------------------------------------------
+/** Start a write multiple blocks sequence.
+ *
+ * \param[in] blockNumber Address of first block in sequence.
+ * \param[in] eraseCount The number of blocks to be pre-erased.
+ *
+ * \note This function is used with writeData() and writeStop()
+ * for optimized multiple block writes.
+ *
+ * \return The value one, true, is returned for success and
+ * the value zero, false, is returned for failure.
+ */
+uint8_t Sd2Card::writeStart(uint32_t blockNumber, uint32_t eraseCount) {
+#if SD_PROTECT_BLOCK_ZERO
+  // don't allow write to first block
+  if (blockNumber == 0) {
+    error(SD_CARD_ERROR_WRITE_BLOCK_ZERO);
+    goto fail;
+  }
+#endif  // SD_PROTECT_BLOCK_ZERO
+  // send pre-erase count
+  if (cardAcmd(ACMD23, eraseCount)) {
+    error(SD_CARD_ERROR_ACMD23);
+    goto fail;
+  }
+  // use address if not SDHC card
+  if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;
+  if (cardCommand(CMD25, blockNumber)) {
+    error(SD_CARD_ERROR_CMD25);
+    goto fail;
+  }
+  return true;
+
+ fail:
+  chipSelectHigh();
+  return false;
+}
+//------------------------------------------------------------------------------
+/** End a write multiple blocks sequence.
+ *
+* \return The value one, true, is returned for success and
+ * the value zero, false, is returned for failure.
+ */
+uint8_t Sd2Card::writeStop(void) {
+  if (!waitNotBusy(SD_WRITE_TIMEOUT)) goto fail;
+  spiSend(STOP_TRAN_TOKEN);
+  if (!waitNotBusy(SD_WRITE_TIMEOUT)) goto fail;
+  chipSelectHigh();
+  return true;
+
+ fail:
+  error(SD_CARD_ERROR_STOP_TRAN);
+  chipSelectHigh();
+  return false;
+}

utility/Sd2Card.h

@@ -0,0 +1,233 @@
+/* Arduino Sd2Card Library
+ * Copyright (C) 2009 by William Greiman
+ *
+ * This file is part of the Arduino Sd2Card Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino Sd2Card Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+#ifndef Sd2Card_h
+#define Sd2Card_h
+/**
+ * \file
+ * Sd2Card class
+ */
+#include "Sd2PinMap.h"
+#include "SdInfo.h"
+/** Set SCK to max rate of F_CPU/2. See Sd2Card::setSckRate(). */
+uint8_t const SPI_FULL_SPEED = 0;
+/** Set SCK rate to F_CPU/4. See Sd2Card::setSckRate(). */
+uint8_t const SPI_HALF_SPEED = 1;
+/** Set SCK rate to F_CPU/8. Sd2Card::setSckRate(). */
+uint8_t const SPI_QUARTER_SPEED = 2;
+/**
+ * Define MEGA_SOFT_SPI non-zero to use software SPI on Mega Arduinos.
+ * Pins used are SS 10, MOSI 11, MISO 12, and SCK 13.
+ *
+ * MEGA_SOFT_SPI allows an unmodified Adafruit GPS Shield to be used
+ * on Mega Arduinos.  Software SPI works well with GPS Shield V1.1
+ * but many SD cards will fail with GPS Shield V1.0.
+ */
+#define MEGA_SOFT_SPI 0
+//------------------------------------------------------------------------------
+#if MEGA_SOFT_SPI && (defined(__AVR_ATmega1280__)||defined(__AVR_ATmega2560__))
+#define SOFTWARE_SPI
+#endif  // MEGA_SOFT_SPI
+//------------------------------------------------------------------------------
+// SPI pin definitions
+//
+#ifndef SOFTWARE_SPI
+// hardware pin defs
+/**
+ * SD Chip Select pin
+ *
+ * Warning if this pin is redefined the hardware SS will pin will be enabled
+ * as an output by init().  An avr processor will not function as an SPI
+ * master unless SS is set to output mode.
+ */
+/** The default chip select pin for the SD card is SS. */
+uint8_t const  SD_CHIP_SELECT_PIN = SS_PIN;
+// The following three pins must not be redefined for hardware SPI.
+/** SPI Master Out Slave In pin */
+uint8_t const  SPI_MOSI_PIN = MOSI_PIN;
+/** SPI Master In Slave Out pin */
+uint8_t const  SPI_MISO_PIN = MISO_PIN;
+/** SPI Clock pin */
+uint8_t const  SPI_SCK_PIN = SCK_PIN;
+/** optimize loops for hardware SPI */
+#define OPTIMIZE_HARDWARE_SPI
+
+#else  // SOFTWARE_SPI
+// define software SPI pins so Mega can use unmodified GPS Shield
+/** SPI chip select pin */
+uint8_t const SD_CHIP_SELECT_PIN = 10;
+/** SPI Master Out Slave In pin */
+uint8_t const SPI_MOSI_PIN = 11;
+/** SPI Master In Slave Out pin */
+uint8_t const SPI_MISO_PIN = 12;
+/** SPI Clock pin */
+uint8_t const SPI_SCK_PIN = 13;
+#endif  // SOFTWARE_SPI
+//------------------------------------------------------------------------------
+/** Protect block zero from write if nonzero */
+#define SD_PROTECT_BLOCK_ZERO 1
+/** init timeout ms */
+uint16_t const SD_INIT_TIMEOUT = 2000;
+/** erase timeout ms */
+uint16_t const SD_ERASE_TIMEOUT = 10000;
+/** read timeout ms */
+uint16_t const SD_READ_TIMEOUT = 300;
+/** write time out ms */
+uint16_t const SD_WRITE_TIMEOUT = 600;
+//------------------------------------------------------------------------------
+// SD card errors
+/** timeout error for command CMD0 */
+uint8_t const SD_CARD_ERROR_CMD0 = 0X1;
+/** CMD8 was not accepted - not a valid SD card*/
+uint8_t const SD_CARD_ERROR_CMD8 = 0X2;
+/** card returned an error response for CMD17 (read block) */
+uint8_t const SD_CARD_ERROR_CMD17 = 0X3;
+/** card returned an error response for CMD24 (write block) */
+uint8_t const SD_CARD_ERROR_CMD24 = 0X4;
+/**  WRITE_MULTIPLE_BLOCKS command failed */
+uint8_t const SD_CARD_ERROR_CMD25 = 0X05;
+/** card returned an error response for CMD58 (read OCR) */
+uint8_t const SD_CARD_ERROR_CMD58 = 0X06;
+/** SET_WR_BLK_ERASE_COUNT failed */
+uint8_t const SD_CARD_ERROR_ACMD23 = 0X07;
+/** card's ACMD41 initialization process timeout */
+uint8_t const SD_CARD_ERROR_ACMD41 = 0X08;
+/** card returned a bad CSR version field */
+uint8_t const SD_CARD_ERROR_BAD_CSD = 0X09;
+/** erase block group command failed */
+uint8_t const SD_CARD_ERROR_ERASE = 0X0A;
+/** card not capable of single block erase */
+uint8_t const SD_CARD_ERROR_ERASE_SINGLE_BLOCK = 0X0B;
+/** Erase sequence timed out */
+uint8_t const SD_CARD_ERROR_ERASE_TIMEOUT = 0X0C;
+/** card returned an error token instead of read data */
+uint8_t const SD_CARD_ERROR_READ = 0X0D;
+/** read CID or CSD failed */
+uint8_t const SD_CARD_ERROR_READ_REG = 0X0E;
+/** timeout while waiting for start of read data */
+uint8_t const SD_CARD_ERROR_READ_TIMEOUT = 0X0F;
+/** card did not accept STOP_TRAN_TOKEN */
+uint8_t const SD_CARD_ERROR_STOP_TRAN = 0X10;
+/** card returned an error token as a response to a write operation */
+uint8_t const SD_CARD_ERROR_WRITE = 0X11;
+/** attempt to write protected block zero */
+uint8_t const SD_CARD_ERROR_WRITE_BLOCK_ZERO = 0X12;
+/** card did not go ready for a multiple block write */
+uint8_t const SD_CARD_ERROR_WRITE_MULTIPLE = 0X13;
+/** card returned an error to a CMD13 status check after a write */
+uint8_t const SD_CARD_ERROR_WRITE_PROGRAMMING = 0X14;
+/** timeout occurred during write programming */
+uint8_t const SD_CARD_ERROR_WRITE_TIMEOUT = 0X15;
+/** incorrect rate selected */
+uint8_t const SD_CARD_ERROR_SCK_RATE = 0X16;
+//------------------------------------------------------------------------------
+// card types
+/** Standard capacity V1 SD card */
+uint8_t const SD_CARD_TYPE_SD1 = 1;
+/** Standard capacity V2 SD card */
+uint8_t const SD_CARD_TYPE_SD2 = 2;
+/** High Capacity SD card */
+uint8_t const SD_CARD_TYPE_SDHC = 3;
+//------------------------------------------------------------------------------
+/**
+ * \class Sd2Card
+ * \brief Raw access to SD and SDHC flash memory cards.
+ */
+class Sd2Card {
+ public:
+  /** Construct an instance of Sd2Card. */
+  Sd2Card(void) : errorCode_(0), inBlock_(0), partialBlockRead_(0), type_(0) {}
+  uint32_t cardSize(void);
+  uint8_t erase(uint32_t firstBlock, uint32_t lastBlock);
+  uint8_t eraseSingleBlockEnable(void);
+  /**
+   * \return error code for last error. See Sd2Card.h for a list of error codes.
+   */
+  uint8_t errorCode(void) const {return errorCode_;}
+  /** \return error data for last error. */
+  uint8_t errorData(void) const {return status_;}
+  /**
+   * Initialize an SD flash memory card with default clock rate and chip
+   * select pin.  See sd2Card::init(uint8_t sckRateID, uint8_t chipSelectPin).
+   */
+  uint8_t init(void) {
+    return init(SPI_FULL_SPEED, SD_CHIP_SELECT_PIN);
+  }
+  /**
+   * Initialize an SD flash memory card with the selected SPI clock rate
+   * and the default SD chip select pin.
+   * See sd2Card::init(uint8_t sckRateID, uint8_t chipSelectPin).
+   */
+  uint8_t init(uint8_t sckRateID) {
+    return init(sckRateID, SD_CHIP_SELECT_PIN);
+  }
+  uint8_t init(uint8_t sckRateID, uint8_t chipSelectPin);
+  void partialBlockRead(uint8_t value);
+  /** Returns the current value, true or false, for partial block read. */
+  uint8_t partialBlockRead(void) const {return partialBlockRead_;}
+  uint8_t readBlock(uint32_t block, uint8_t* dst);
+  uint8_t readData(uint32_t block,
+          uint16_t offset, uint16_t count, uint8_t* dst);
+  /**
+   * Read a cards CID register. The CID contains card identification
+   * information such as Manufacturer ID, Product name, Product serial
+   * number and Manufacturing date. */
+  uint8_t readCID(cid_t* cid) {
+    return readRegister(CMD10, cid);
+  }
+  /**
+   * Read a cards CSD register. The CSD contains Card-Specific Data that
+   * provides information regarding access to the card's contents. */
+  uint8_t readCSD(csd_t* csd) {
+    return readRegister(CMD9, csd);
+  }
+  void readEnd(void);
+  uint8_t setSckRate(uint8_t sckRateID);
+  /** Return the card type: SD V1, SD V2 or SDHC */
+  uint8_t type(void) const {return type_;}
+  uint8_t writeBlock(uint32_t blockNumber, const uint8_t* src);
+  uint8_t writeData(const uint8_t* src);
+  uint8_t writeStart(uint32_t blockNumber, uint32_t eraseCount);
+  uint8_t writeStop(void);
+ private:
+  uint32_t block_;
+  uint8_t chipSelectPin_;
+  uint8_t errorCode_;
+  uint8_t inBlock_;
+  uint16_t offset_;
+  uint8_t partialBlockRead_;
+  uint8_t status_;
+  uint8_t type_;
+  // private functions
+  uint8_t cardAcmd(uint8_t cmd, uint32_t arg) {
+    cardCommand(CMD55, 0);
+    return cardCommand(cmd, arg);
+  }
+  uint8_t cardCommand(uint8_t cmd, uint32_t arg);
+  void error(uint8_t code) {errorCode_ = code;}
+  uint8_t readRegister(uint8_t cmd, void* buf);
+  uint8_t sendWriteCommand(uint32_t blockNumber, uint32_t eraseCount);
+  void chipSelectHigh(void);
+  void chipSelectLow(void);
+  void type(uint8_t value) {type_ = value;}
+  uint8_t waitNotBusy(uint16_t timeoutMillis);
+  uint8_t writeData(uint8_t token, const uint8_t* src);
+  uint8_t waitStartBlock(void);
+};
+#endif  // Sd2Card_h

utility/Sd2PinMap.h

@@ -0,0 +1,352 @@
+/* Arduino SdFat Library
+ * Copyright (C) 2010 by William Greiman
+ *
+ * This file is part of the Arduino SdFat Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino SdFat Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+// Warning this file was generated by a program.
+#ifndef Sd2PinMap_h
+#define Sd2PinMap_h
+#include <avr/io.h>
+
+//------------------------------------------------------------------------------
+/** struct for mapping digital pins */
+struct pin_map_t {
+  volatile uint8_t* ddr;
+  volatile uint8_t* pin;
+  volatile uint8_t* port;
+  uint8_t bit;
+};
+//------------------------------------------------------------------------------
+#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+// Mega
+
+// Two Wire (aka I2C) ports
+uint8_t const SDA_PIN = 20;
+uint8_t const SCL_PIN = 21;
+
+// SPI port
+uint8_t const SS_PIN = 53;
+uint8_t const MOSI_PIN = 51;
+uint8_t const MISO_PIN = 50;
+uint8_t const SCK_PIN = 52;
+
+static const pin_map_t digitalPinMap[] = {
+  {&DDRE, &PINE, &PORTE, 0},  // E0  0
+  {&DDRE, &PINE, &PORTE, 1},  // E1  1
+  {&DDRE, &PINE, &PORTE, 4},  // E4  2
+  {&DDRE, &PINE, &PORTE, 5},  // E5  3
+  {&DDRG, &PING, &PORTG, 5},  // G5  4
+  {&DDRE, &PINE, &PORTE, 3},  // E3  5
+  {&DDRH, &PINH, &PORTH, 3},  // H3  6
+  {&DDRH, &PINH, &PORTH, 4},  // H4  7
+  {&DDRH, &PINH, &PORTH, 5},  // H5  8
+  {&DDRH, &PINH, &PORTH, 6},  // H6  9
+  {&DDRB, &PINB, &PORTB, 4},  // B4 10
+  {&DDRB, &PINB, &PORTB, 5},  // B5 11
+  {&DDRB, &PINB, &PORTB, 6},  // B6 12
+  {&DDRB, &PINB, &PORTB, 7},  // B7 13
+  {&DDRJ, &PINJ, &PORTJ, 1},  // J1 14
+  {&DDRJ, &PINJ, &PORTJ, 0},  // J0 15
+  {&DDRH, &PINH, &PORTH, 1},  // H1 16
+  {&DDRH, &PINH, &PORTH, 0},  // H0 17
+  {&DDRD, &PIND, &PORTD, 3},  // D3 18
+  {&DDRD, &PIND, &PORTD, 2},  // D2 19
+  {&DDRD, &PIND, &PORTD, 1},  // D1 20
+  {&DDRD, &PIND, &PORTD, 0},  // D0 21
+  {&DDRA, &PINA, &PORTA, 0},  // A0 22
+  {&DDRA, &PINA, &PORTA, 1},  // A1 23
+  {&DDRA, &PINA, &PORTA, 2},  // A2 24
+  {&DDRA, &PINA, &PORTA, 3},  // A3 25
+  {&DDRA, &PINA, &PORTA, 4},  // A4 26
+  {&DDRA, &PINA, &PORTA, 5},  // A5 27
+  {&DDRA, &PINA, &PORTA, 6},  // A6 28
+  {&DDRA, &PINA, &PORTA, 7},  // A7 29
+  {&DDRC, &PINC, &PORTC, 7},  // C7 30
+  {&DDRC, &PINC, &PORTC, 6},  // C6 31
+  {&DDRC, &PINC, &PORTC, 5},  // C5 32
+  {&DDRC, &PINC, &PORTC, 4},  // C4 33
+  {&DDRC, &PINC, &PORTC, 3},  // C3 34
+  {&DDRC, &PINC, &PORTC, 2},  // C2 35
+  {&DDRC, &PINC, &PORTC, 1},  // C1 36
+  {&DDRC, &PINC, &PORTC, 0},  // C0 37
+  {&DDRD, &PIND, &PORTD, 7},  // D7 38
+  {&DDRG, &PING, &PORTG, 2},  // G2 39
+  {&DDRG, &PING, &PORTG, 1},  // G1 40
+  {&DDRG, &PING, &PORTG, 0},  // G0 41
+  {&DDRL, &PINL, &PORTL, 7},  // L7 42
+  {&DDRL, &PINL, &PORTL, 6},  // L6 43
+  {&DDRL, &PINL, &PORTL, 5},  // L5 44
+  {&DDRL, &PINL, &PORTL, 4},  // L4 45
+  {&DDRL, &PINL, &PORTL, 3},  // L3 46
+  {&DDRL, &PINL, &PORTL, 2},  // L2 47
+  {&DDRL, &PINL, &PORTL, 1},  // L1 48
+  {&DDRL, &PINL, &PORTL, 0},  // L0 49
+  {&DDRB, &PINB, &PORTB, 3},  // B3 50
+  {&DDRB, &PINB, &PORTB, 2},  // B2 51
+  {&DDRB, &PINB, &PORTB, 1},  // B1 52
+  {&DDRB, &PINB, &PORTB, 0},  // B0 53
+  {&DDRF, &PINF, &PORTF, 0},  // F0 54
+  {&DDRF, &PINF, &PORTF, 1},  // F1 55
+  {&DDRF, &PINF, &PORTF, 2},  // F2 56
+  {&DDRF, &PINF, &PORTF, 3},  // F3 57
+  {&DDRF, &PINF, &PORTF, 4},  // F4 58
+  {&DDRF, &PINF, &PORTF, 5},  // F5 59
+  {&DDRF, &PINF, &PORTF, 6},  // F6 60
+  {&DDRF, &PINF, &PORTF, 7},  // F7 61
+  {&DDRK, &PINK, &PORTK, 0},  // K0 62
+  {&DDRK, &PINK, &PORTK, 1},  // K1 63
+  {&DDRK, &PINK, &PORTK, 2},  // K2 64
+  {&DDRK, &PINK, &PORTK, 3},  // K3 65
+  {&DDRK, &PINK, &PORTK, 4},  // K4 66
+  {&DDRK, &PINK, &PORTK, 5},  // K5 67
+  {&DDRK, &PINK, &PORTK, 6},  // K6 68
+  {&DDRK, &PINK, &PORTK, 7}   // K7 69
+};
+//------------------------------------------------------------------------------
+#elif defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644__)
+// Sanguino
+
+// Two Wire (aka I2C) ports
+uint8_t const SDA_PIN = 17;
+uint8_t const SCL_PIN = 18;
+
+// SPI port
+uint8_t const SS_PIN = 4;
+uint8_t const MOSI_PIN = 5;
+uint8_t const MISO_PIN = 6;
+uint8_t const SCK_PIN = 7;
+
+static const pin_map_t digitalPinMap[] = {
+  {&DDRB, &PINB, &PORTB, 0},  // B0  0
+  {&DDRB, &PINB, &PORTB, 1},  // B1  1
+  {&DDRB, &PINB, &PORTB, 2},  // B2  2
+  {&DDRB, &PINB, &PORTB, 3},  // B3  3
+  {&DDRB, &PINB, &PORTB, 4},  // B4  4
+  {&DDRB, &PINB, &PORTB, 5},  // B5  5
+  {&DDRB, &PINB, &PORTB, 6},  // B6  6
+  {&DDRB, &PINB, &PORTB, 7},  // B7  7
+  {&DDRD, &PIND, &PORTD, 0},  // D0  8
+  {&DDRD, &PIND, &PORTD, 1},  // D1  9
+  {&DDRD, &PIND, &PORTD, 2},  // D2 10
+  {&DDRD, &PIND, &PORTD, 3},  // D3 11
+  {&DDRD, &PIND, &PORTD, 4},  // D4 12
+  {&DDRD, &PIND, &PORTD, 5},  // D5 13
+  {&DDRD, &PIND, &PORTD, 6},  // D6 14
+  {&DDRD, &PIND, &PORTD, 7},  // D7 15
+  {&DDRC, &PINC, &PORTC, 0},  // C0 16
+  {&DDRC, &PINC, &PORTC, 1},  // C1 17
+  {&DDRC, &PINC, &PORTC, 2},  // C2 18
+  {&DDRC, &PINC, &PORTC, 3},  // C3 19
+  {&DDRC, &PINC, &PORTC, 4},  // C4 20
+  {&DDRC, &PINC, &PORTC, 5},  // C5 21
+  {&DDRC, &PINC, &PORTC, 6},  // C6 22
+  {&DDRC, &PINC, &PORTC, 7},  // C7 23
+  {&DDRA, &PINA, &PORTA, 7},  // A7 24
+  {&DDRA, &PINA, &PORTA, 6},  // A6 25
+  {&DDRA, &PINA, &PORTA, 5},  // A5 26
+  {&DDRA, &PINA, &PORTA, 4},  // A4 27
+  {&DDRA, &PINA, &PORTA, 3},  // A3 28
+  {&DDRA, &PINA, &PORTA, 2},  // A2 29
+  {&DDRA, &PINA, &PORTA, 1},  // A1 30
+  {&DDRA, &PINA, &PORTA, 0}   // A0 31
+};
+//------------------------------------------------------------------------------
+#elif defined(__AVR_ATmega32U4__)
+// Leonardo
+
+// Two Wire (aka I2C) ports
+uint8_t const SDA_PIN = 2;
+uint8_t const SCL_PIN = 3;
+
+// SPI port
+uint8_t const SS_PIN = 17;
+uint8_t const MOSI_PIN = 16;
+uint8_t const MISO_PIN = 14;
+uint8_t const SCK_PIN = 15;
+
+static const pin_map_t digitalPinMap[] = {
+  {&DDRD, &PIND, &PORTD, 2},  // D2  0
+  {&DDRD, &PIND, &PORTD, 3},  // D3  1
+  {&DDRD, &PIND, &PORTD, 1},  // D1  2
+  {&DDRD, &PIND, &PORTD, 0},  // D0  3
+  {&DDRD, &PIND, &PORTD, 4},  // D4  4
+  {&DDRC, &PINC, &PORTC, 6},  // C6  5
+  {&DDRD, &PIND, &PORTD, 7},  // D7  6
+  {&DDRE, &PINE, &PORTE, 6},  // E6  7
+  {&DDRB, &PINB, &PORTB, 4},  // B4  8
+  {&DDRB, &PINB, &PORTB, 5},  // B5  9
+  {&DDRB, &PINB, &PORTB, 6},  // B6 10
+  {&DDRB, &PINB, &PORTB, 7},  // B7 11
+  {&DDRD, &PIND, &PORTD, 6},  // D6 12
+  {&DDRC, &PINC, &PORTC, 7},  // C7 13
+  {&DDRB, &PINB, &PORTB, 3},  // B3 14
+  {&DDRB, &PINB, &PORTB, 1},  // B1 15
+  {&DDRB, &PINB, &PORTB, 2},  // B2 16
+  {&DDRB, &PINB, &PORTB, 0},  // B0 17
+  {&DDRF, &PINF, &PORTF, 7},  // F7 18
+  {&DDRF, &PINF, &PORTF, 6},  // F6 19
+  {&DDRF, &PINF, &PORTF, 5},  // F5 20
+  {&DDRF, &PINF, &PORTF, 4},  // F4 21
+  {&DDRF, &PINF, &PORTF, 1},  // F1 22
+  {&DDRF, &PINF, &PORTF, 0},  // F0 23
+};
+//------------------------------------------------------------------------------
+#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
+// Teensy++ 1.0 & 2.0
+
+// Two Wire (aka I2C) ports
+uint8_t const SDA_PIN = 1;
+uint8_t const SCL_PIN = 0;
+
+// SPI port
+uint8_t const SS_PIN = 20;
+uint8_t const MOSI_PIN = 22;
+uint8_t const MISO_PIN = 23;
+uint8_t const SCK_PIN = 21;
+
+static const pin_map_t digitalPinMap[] = {
+  {&DDRD, &PIND, &PORTD, 0},  // D0  0
+  {&DDRD, &PIND, &PORTD, 1},  // D1  1
+  {&DDRD, &PIND, &PORTD, 2},  // D2  2
+  {&DDRD, &PIND, &PORTD, 3},  // D3  3
+  {&DDRD, &PIND, &PORTD, 4},  // D4  4
+  {&DDRD, &PIND, &PORTD, 5},  // D5  5
+  {&DDRD, &PIND, &PORTD, 6},  // D6  6
+  {&DDRD, &PIND, &PORTD, 7},  // D7  7
+  {&DDRE, &PINE, &PORTE, 0},  // E0  8
+  {&DDRE, &PINE, &PORTE, 1},  // E1  9
+  {&DDRC, &PINC, &PORTC, 0},  // C0 10
+  {&DDRC, &PINC, &PORTC, 1},  // C1 11
+  {&DDRC, &PINC, &PORTC, 2},  // C2 12
+  {&DDRC, &PINC, &PORTC, 3},  // C3 13
+  {&DDRC, &PINC, &PORTC, 4},  // C4 14
+  {&DDRC, &PINC, &PORTC, 5},  // C5 15
+  {&DDRC, &PINC, &PORTC, 6},  // C6 16
+  {&DDRC, &PINC, &PORTC, 7},  // C7 17
+  {&DDRE, &PINE, &PORTE, 6},  // E6 18
+  {&DDRE, &PINE, &PORTE, 7},  // E7 19
+  {&DDRB, &PINB, &PORTB, 0},  // B0 20
+  {&DDRB, &PINB, &PORTB, 1},  // B1 21
+  {&DDRB, &PINB, &PORTB, 2},  // B2 22
+  {&DDRB, &PINB, &PORTB, 3},  // B3 23
+  {&DDRB, &PINB, &PORTB, 4},  // B4 24
+  {&DDRB, &PINB, &PORTB, 5},  // B5 25
+  {&DDRB, &PINB, &PORTB, 6},  // B6 26
+  {&DDRB, &PINB, &PORTB, 7},  // B7 27
+  {&DDRA, &PINA, &PORTA, 0},  // A0 28
+  {&DDRA, &PINA, &PORTA, 1},  // A1 29
+  {&DDRA, &PINA, &PORTA, 2},  // A2 30
+  {&DDRA, &PINA, &PORTA, 3},  // A3 31
+  {&DDRA, &PINA, &PORTA, 4},  // A4 32
+  {&DDRA, &PINA, &PORTA, 5},  // A5 33
+  {&DDRA, &PINA, &PORTA, 6},  // A6 34
+  {&DDRA, &PINA, &PORTA, 7},  // A7 35
+  {&DDRE, &PINE, &PORTE, 4},  // E4 36
+  {&DDRE, &PINE, &PORTE, 5},  // E5 37
+  {&DDRF, &PINF, &PORTF, 0},  // F0 38
+  {&DDRF, &PINF, &PORTF, 1},  // F1 39
+  {&DDRF, &PINF, &PORTF, 2},  // F2 40
+  {&DDRF, &PINF, &PORTF, 3},  // F3 41
+  {&DDRF, &PINF, &PORTF, 4},  // F4 42
+  {&DDRF, &PINF, &PORTF, 5},  // F5 43
+  {&DDRF, &PINF, &PORTF, 6},  // F6 44
+  {&DDRF, &PINF, &PORTF, 7}   // F7 45
+};
+//------------------------------------------------------------------------------
+#else  // defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+// 168 and 328 Arduinos
+
+// Two Wire (aka I2C) ports
+uint8_t const SDA_PIN = 18;
+uint8_t const SCL_PIN = 19;
+
+// SPI port
+uint8_t const SS_PIN = 10;
+uint8_t const MOSI_PIN = 11;
+uint8_t const MISO_PIN = 12;
+uint8_t const SCK_PIN = 13;
+
+static const pin_map_t digitalPinMap[] = {
+  {&DDRD, &PIND, &PORTD, 0},  // D0  0
+  {&DDRD, &PIND, &PORTD, 1},  // D1  1
+  {&DDRD, &PIND, &PORTD, 2},  // D2  2
+  {&DDRD, &PIND, &PORTD, 3},  // D3  3
+  {&DDRD, &PIND, &PORTD, 4},  // D4  4
+  {&DDRD, &PIND, &PORTD, 5},  // D5  5
+  {&DDRD, &PIND, &PORTD, 6},  // D6  6
+  {&DDRD, &PIND, &PORTD, 7},  // D7  7
+  {&DDRB, &PINB, &PORTB, 0},  // B0  8
+  {&DDRB, &PINB, &PORTB, 1},  // B1  9
+  {&DDRB, &PINB, &PORTB, 2},  // B2 10
+  {&DDRB, &PINB, &PORTB, 3},  // B3 11
+  {&DDRB, &PINB, &PORTB, 4},  // B4 12
+  {&DDRB, &PINB, &PORTB, 5},  // B5 13
+  {&DDRC, &PINC, &PORTC, 0},  // C0 14
+  {&DDRC, &PINC, &PORTC, 1},  // C1 15
+  {&DDRC, &PINC, &PORTC, 2},  // C2 16
+  {&DDRC, &PINC, &PORTC, 3},  // C3 17
+  {&DDRC, &PINC, &PORTC, 4},  // C4 18
+  {&DDRC, &PINC, &PORTC, 5}   // C5 19
+};
+#endif  // defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+//------------------------------------------------------------------------------
+static const uint8_t digitalPinCount = sizeof(digitalPinMap)/sizeof(pin_map_t);
+
+uint8_t badPinNumber(void)
+  __attribute__((error("Pin number is too large or not a constant")));
+
+static inline __attribute__((always_inline))
+  uint8_t getPinMode(uint8_t pin) {
+  if (__builtin_constant_p(pin) && pin < digitalPinCount) {
+    return (*digitalPinMap[pin].ddr >> digitalPinMap[pin].bit) & 1;
+  } else {
+    return badPinNumber();
+  }
+}
+static inline __attribute__((always_inline))
+  void setPinMode(uint8_t pin, uint8_t mode) {
+  if (__builtin_constant_p(pin) && pin < digitalPinCount) {
+    if (mode) {
+      *digitalPinMap[pin].ddr |= 1 << digitalPinMap[pin].bit;
+    } else {
+      *digitalPinMap[pin].ddr &= ~(1 << digitalPinMap[pin].bit);
+    }
+  } else {
+    badPinNumber();
+  }
+}
+static inline __attribute__((always_inline))
+  uint8_t fastDigitalRead(uint8_t pin) {
+  if (__builtin_constant_p(pin) && pin < digitalPinCount) {
+    return (*digitalPinMap[pin].pin >> digitalPinMap[pin].bit) & 1;
+  } else {
+    return badPinNumber();
+  }
+}
+static inline __attribute__((always_inline))
+  void fastDigitalWrite(uint8_t pin, uint8_t value) {
+  if (__builtin_constant_p(pin) && pin < digitalPinCount) {
+    if (value) {
+      *digitalPinMap[pin].port |= 1 << digitalPinMap[pin].bit;
+    } else {
+      *digitalPinMap[pin].port &= ~(1 << digitalPinMap[pin].bit);
+    }
+  } else {
+    badPinNumber();
+  }
+}
+#endif  // Sd2PinMap_h

utility/SdFat.h

@@ -0,0 +1,547 @@
+/* Arduino SdFat Library
+ * Copyright (C) 2009 by William Greiman
+ *
+ * This file is part of the Arduino SdFat Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino SdFat Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+#ifndef SdFat_h
+#define SdFat_h
+/**
+ * \file
+ * SdFile and SdVolume classes
+ */
+#include <avr/pgmspace.h>
+#include "Sd2Card.h"
+#include "FatStructs.h"
+#include "Print.h"
+//------------------------------------------------------------------------------
+/**
+ * Allow use of deprecated functions if non-zero
+ */
+#define ALLOW_DEPRECATED_FUNCTIONS 1
+//------------------------------------------------------------------------------
+// forward declaration since SdVolume is used in SdFile
+class SdVolume;
+//==============================================================================
+// SdFile class
+
+// flags for ls()
+/** ls() flag to print modify date */
+uint8_t const LS_DATE = 1;
+/** ls() flag to print file size */
+uint8_t const LS_SIZE = 2;
+/** ls() flag for recursive list of subdirectories */
+uint8_t const LS_R = 4;
+
+// use the gnu style oflag in open()
+/** open() oflag for reading */
+uint8_t const O_READ = 0X01;
+/** open() oflag - same as O_READ */
+uint8_t const O_RDONLY = O_READ;
+/** open() oflag for write */
+uint8_t const O_WRITE = 0X02;
+/** open() oflag - same as O_WRITE */
+uint8_t const O_WRONLY = O_WRITE;
+/** open() oflag for reading and writing */
+uint8_t const O_RDWR = (O_READ | O_WRITE);
+/** open() oflag mask for access modes */
+uint8_t const O_ACCMODE = (O_READ | O_WRITE);
+/** The file offset shall be set to the end of the file prior to each write. */
+uint8_t const O_APPEND = 0X04;
+/** synchronous writes - call sync() after each write */
+uint8_t const O_SYNC = 0X08;
+/** create the file if nonexistent */
+uint8_t const O_CREAT = 0X10;
+/** If O_CREAT and O_EXCL are set, open() shall fail if the file exists */
+uint8_t const O_EXCL = 0X20;
+/** truncate the file to zero length */
+uint8_t const O_TRUNC = 0X40;
+
+// flags for timestamp
+/** set the file's last access date */
+uint8_t const T_ACCESS = 1;
+/** set the file's creation date and time */
+uint8_t const T_CREATE = 2;
+/** Set the file's write date and time */
+uint8_t const T_WRITE = 4;
+// values for type_
+/** This SdFile has not been opened. */
+uint8_t const FAT_FILE_TYPE_CLOSED = 0;
+/** SdFile for a file */
+uint8_t const FAT_FILE_TYPE_NORMAL = 1;
+/** SdFile for a FAT16 root directory */
+uint8_t const FAT_FILE_TYPE_ROOT16 = 2;
+/** SdFile for a FAT32 root directory */
+uint8_t const FAT_FILE_TYPE_ROOT32 = 3;
+/** SdFile for a subdirectory */
+uint8_t const FAT_FILE_TYPE_SUBDIR = 4;
+/** Test value for directory type */
+uint8_t const FAT_FILE_TYPE_MIN_DIR = FAT_FILE_TYPE_ROOT16;
+
+/** date field for FAT directory entry */
+static inline uint16_t FAT_DATE(uint16_t year, uint8_t month, uint8_t day) {
+  return (year - 1980) << 9 | month << 5 | day;
+}
+/** year part of FAT directory date field */
+static inline uint16_t FAT_YEAR(uint16_t fatDate) {
+  return 1980 + (fatDate >> 9);
+}
+/** month part of FAT directory date field */
+static inline uint8_t FAT_MONTH(uint16_t fatDate) {
+  return (fatDate >> 5) & 0XF;
+}
+/** day part of FAT directory date field */
+static inline uint8_t FAT_DAY(uint16_t fatDate) {
+  return fatDate & 0X1F;
+}
+/** time field for FAT directory entry */
+static inline uint16_t FAT_TIME(uint8_t hour, uint8_t minute, uint8_t second) {
+  return hour << 11 | minute << 5 | second >> 1;
+}
+/** hour part of FAT directory time field */
+static inline uint8_t FAT_HOUR(uint16_t fatTime) {
+  return fatTime >> 11;
+}
+/** minute part of FAT directory time field */
+static inline uint8_t FAT_MINUTE(uint16_t fatTime) {
+  return(fatTime >> 5) & 0X3F;
+}
+/** second part of FAT directory time field */
+static inline uint8_t FAT_SECOND(uint16_t fatTime) {
+  return 2*(fatTime & 0X1F);
+}
+/** Default date for file timestamps is 1 Jan 2000 */
+uint16_t const FAT_DEFAULT_DATE = ((2000 - 1980) << 9) | (1 << 5) | 1;
+/** Default time for file timestamp is 1 am */
+uint16_t const FAT_DEFAULT_TIME = (1 << 11);
+//------------------------------------------------------------------------------
+/**
+ * \class SdFile
+ * \brief Access FAT16 and FAT32 files on SD and SDHC cards.
+ */
+class SdFile : public Print {
+ public:
+  /** Create an instance of SdFile. */
+  SdFile(void) : type_(FAT_FILE_TYPE_CLOSED) {}
+  /**
+   * writeError is set to true if an error occurs during a write().
+   * Set writeError to false before calling print() and/or write() and check
+   * for true after calls to print() and/or write().
+   */
+  //bool writeError;
+  /**
+   * Cancel unbuffered reads for this file.
+   * See setUnbufferedRead()
+   */
+  void clearUnbufferedRead(void) {
+    flags_ &= ~F_FILE_UNBUFFERED_READ;
+  }
+  uint8_t close(void);
+  uint8_t contiguousRange(uint32_t* bgnBlock, uint32_t* endBlock);
+  uint8_t createContiguous(SdFile* dirFile,
+          const char* fileName, uint32_t size);
+  /** \return The current cluster number for a file or directory. */
+  uint32_t curCluster(void) const {return curCluster_;}
+  /** \return The current position for a file or directory. */
+  uint32_t curPosition(void) const {return curPosition_;}
+  /**
+   * Set the date/time callback function
+   *
+   * \param[in] dateTime The user's call back function.  The callback
+   * function is of the form:
+   *
+   * \code
+   * void dateTime(uint16_t* date, uint16_t* time) {
+   *   uint16_t year;
+   *   uint8_t month, day, hour, minute, second;
+   *
+   *   // User gets date and time from GPS or real-time clock here
+   *
+   *   // return date using FAT_DATE macro to format fields
+   *   *date = FAT_DATE(year, month, day);
+   *
+   *   // return time using FAT_TIME macro to format fields
+   *   *time = FAT_TIME(hour, minute, second);
+   * }
+   * \endcode
+   *
+   * Sets the function that is called when a file is created or when
+   * a file's directory entry is modified by sync(). All timestamps,
+   * access, creation, and modify, are set when a file is created.
+   * sync() maintains the last access date and last modify date/time.
+   *
+   * See the timestamp() function.
+   */
+  static void dateTimeCallback(
+    void (*dateTime)(uint16_t* date, uint16_t* time)) {
+    dateTime_ = dateTime;
+  }
+  /**
+   * Cancel the date/time callback function.
+   */
+  static void dateTimeCallbackCancel(void) {
+    // use explicit zero since NULL is not defined for Sanguino
+    dateTime_ = 0;
+  }
+  /** \return Address of the block that contains this file's directory. */
+  uint32_t dirBlock(void) const {return dirBlock_;}
+  uint8_t dirEntry(dir_t* dir);
+  /** \return Index of this file's directory in the block dirBlock. */
+  uint8_t dirIndex(void) const {return dirIndex_;}
+  static void dirName(const dir_t& dir, char* name);
+  /** \return The total number of bytes in a file or directory. */
+  uint32_t fileSize(void) const {return fileSize_;}
+  /** \return The first cluster number for a file or directory. */
+  uint32_t firstCluster(void) const {return firstCluster_;}
+  /** \return True if this is a SdFile for a directory else false. */
+  uint8_t isDir(void) const {return type_ >= FAT_FILE_TYPE_MIN_DIR;}
+  /** \return True if this is a SdFile for a file else false. */
+  uint8_t isFile(void) const {return type_ == FAT_FILE_TYPE_NORMAL;}
+  /** \return True if this is a SdFile for an open file/directory else false. */
+  uint8_t isOpen(void) const {return type_ != FAT_FILE_TYPE_CLOSED;}
+  /** \return True if this is a SdFile for a subdirectory else false. */
+  uint8_t isSubDir(void) const {return type_ == FAT_FILE_TYPE_SUBDIR;}
+  /** \return True if this is a SdFile for the root directory. */
+  uint8_t isRoot(void) const {
+    return type_ == FAT_FILE_TYPE_ROOT16 || type_ == FAT_FILE_TYPE_ROOT32;
+  }
+  void ls(uint8_t flags = 0, uint8_t indent = 0);
+  uint8_t makeDir(SdFile* dir, const char* dirName);
+  uint8_t open(SdFile* dirFile, uint16_t index, uint8_t oflag);
+  uint8_t open(SdFile* dirFile, const char* fileName, uint8_t oflag);
+
+  uint8_t openRoot(SdVolume* vol);
+  static void printDirName(const dir_t& dir, uint8_t width);
+  static void printFatDate(uint16_t fatDate);
+  static void printFatTime(uint16_t fatTime);
+  static void printTwoDigits(uint8_t v);
+  /**
+   * Read the next byte from a file.
+   *
+   * \return For success read returns the next byte in the file as an int.
+   * If an error occurs or end of file is reached -1 is returned.
+   */
+  int16_t read(void) {
+    uint8_t b;
+    return read(&b, 1) == 1 ? b : -1;
+  }
+  int16_t read(void* buf, uint16_t nbyte);
+  int8_t readDir(dir_t* dir);
+  static uint8_t remove(SdFile* dirFile, const char* fileName);
+  uint8_t remove(void);
+  /** Set the file's current position to zero. */
+  void rewind(void) {
+    curPosition_ = curCluster_ = 0;
+  }
+  uint8_t rmDir(void);
+  uint8_t rmRfStar(void);
+  /** Set the files position to current position + \a pos. See seekSet(). */
+  uint8_t seekCur(uint32_t pos) {
+    return seekSet(curPosition_ + pos);
+  }
+  /**
+   *  Set the files current position to end of file.  Useful to position
+   *  a file for append. See seekSet().
+   */
+  uint8_t seekEnd(void) {return seekSet(fileSize_);}
+  uint8_t seekSet(uint32_t pos);
+  /**
+   * Use unbuffered reads to access this file.  Used with Wave
+   * Shield ISR.  Used with Sd2Card::partialBlockRead() in WaveRP.
+   *
+   * Not recommended for normal applications.
+   */
+  void setUnbufferedRead(void) {
+    if (isFile()) flags_ |= F_FILE_UNBUFFERED_READ;
+  }
+  uint8_t timestamp(uint8_t flag, uint16_t year, uint8_t month, uint8_t day,
+          uint8_t hour, uint8_t minute, uint8_t second);
+  uint8_t sync(void);
+  /** Type of this SdFile.  You should use isFile() or isDir() instead of type()
+   * if possible.
+   *
+   * \return The file or directory type.
+   */
+  uint8_t type(void) const {return type_;}
+  uint8_t truncate(uint32_t size);
+  /** \return Unbuffered read flag. */
+  uint8_t unbufferedRead(void) const {
+    return flags_ & F_FILE_UNBUFFERED_READ;
+  }
+  /** \return SdVolume that contains this file. */
+  SdVolume* volume(void) const {return vol_;}
+  size_t write(uint8_t b);
+  size_t write(const void* buf, uint16_t nbyte);
+  size_t write(const char* str);
+  void write_P(PGM_P str);
+  void writeln_P(PGM_P str);
+//------------------------------------------------------------------------------
+#if ALLOW_DEPRECATED_FUNCTIONS
+// Deprecated functions  - suppress cpplint warnings with NOLINT comment
+  /** \deprecated Use:
+   * uint8_t SdFile::contiguousRange(uint32_t* bgnBlock, uint32_t* endBlock);
+   */
+  uint8_t contiguousRange(uint32_t& bgnBlock, uint32_t& endBlock) {  // NOLINT
+    return contiguousRange(&bgnBlock, &endBlock);
+  }
+ /** \deprecated Use:
+   * uint8_t SdFile::createContiguous(SdFile* dirFile,
+   *   const char* fileName, uint32_t size)
+   */
+  uint8_t createContiguous(SdFile& dirFile,  // NOLINT
+    const char* fileName, uint32_t size) {
+    return createContiguous(&dirFile, fileName, size);
+  }
+
+  /**
+   * \deprecated Use:
+   * static void SdFile::dateTimeCallback(
+   *   void (*dateTime)(uint16_t* date, uint16_t* time));
+   */
+  static void dateTimeCallback(
+    void (*dateTime)(uint16_t& date, uint16_t& time)) {  // NOLINT
+    oldDateTime_ = dateTime;
+    dateTime_ = dateTime ? oldToNew : 0;
+  }
+  /** \deprecated Use: uint8_t SdFile::dirEntry(dir_t* dir); */
+  uint8_t dirEntry(dir_t& dir) {return dirEntry(&dir);}  // NOLINT
+  /** \deprecated Use:
+   * uint8_t SdFile::makeDir(SdFile* dir, const char* dirName);
+   */
+  uint8_t makeDir(SdFile& dir, const char* dirName) {  // NOLINT
+    return makeDir(&dir, dirName);
+  }
+  /** \deprecated Use:
+   * uint8_t SdFile::open(SdFile* dirFile, const char* fileName, uint8_t oflag);
+   */
+  uint8_t open(SdFile& dirFile, // NOLINT
+    const char* fileName, uint8_t oflag) {
+    return open(&dirFile, fileName, oflag);
+  }
+  /** \deprecated  Do not use in new apps */
+  uint8_t open(SdFile& dirFile, const char* fileName) {  // NOLINT
+    return open(dirFile, fileName, O_RDWR);
+  }
+  /** \deprecated Use:
+   * uint8_t SdFile::open(SdFile* dirFile, uint16_t index, uint8_t oflag);
+   */
+  uint8_t open(SdFile& dirFile, uint16_t index, uint8_t oflag) {  // NOLINT
+    return open(&dirFile, index, oflag);
+  }
+  /** \deprecated Use: uint8_t SdFile::openRoot(SdVolume* vol); */
+  uint8_t openRoot(SdVolume& vol) {return openRoot(&vol);}  // NOLINT
+
+  /** \deprecated Use: int8_t SdFile::readDir(dir_t* dir); */
+  int8_t readDir(dir_t& dir) {return readDir(&dir);}  // NOLINT
+  /** \deprecated Use:
+   * static uint8_t SdFile::remove(SdFile* dirFile, const char* fileName);
+   */
+  static uint8_t remove(SdFile& dirFile, const char* fileName) {  // NOLINT
+    return remove(&dirFile, fileName);
+  }
+//------------------------------------------------------------------------------
+// rest are private
+ private:
+  static void (*oldDateTime_)(uint16_t& date, uint16_t& time);  // NOLINT
+  static void oldToNew(uint16_t* date, uint16_t* time) {
+    uint16_t d;
+    uint16_t t;
+    oldDateTime_(d, t);
+    *date = d;
+    *time = t;
+  }
+#endif  // ALLOW_DEPRECATED_FUNCTIONS
+ private:
+  // bits defined in flags_
+  // should be 0XF
+  static uint8_t const F_OFLAG = (O_ACCMODE | O_APPEND | O_SYNC);
+  // available bits
+  static uint8_t const F_UNUSED = 0X30;
+  // use unbuffered SD read
+  static uint8_t const F_FILE_UNBUFFERED_READ = 0X40;
+  // sync of directory entry required
+  static uint8_t const F_FILE_DIR_DIRTY = 0X80;
+
+// make sure F_OFLAG is ok
+#if ((F_UNUSED | F_FILE_UNBUFFERED_READ | F_FILE_DIR_DIRTY) & F_OFLAG)
+#error flags_ bits conflict
+#endif  // flags_ bits
+
+  // private data
+  uint8_t   flags_;         // See above for definition of flags_ bits
+  uint8_t   type_;          // type of file see above for values
+  uint32_t  curCluster_;    // cluster for current file position
+  uint32_t  curPosition_;   // current file position in bytes from beginning
+  uint32_t  dirBlock_;      // SD block that contains directory entry for file
+  uint8_t   dirIndex_;      // index of entry in dirBlock 0 <= dirIndex_ <= 0XF
+  uint32_t  fileSize_;      // file size in bytes
+  uint32_t  firstCluster_;  // first cluster of file
+  SdVolume* vol_;           // volume where file is located
+
+  // private functions
+  uint8_t addCluster(void);
+  uint8_t addDirCluster(void);
+  dir_t* cacheDirEntry(uint8_t action);
+  static void (*dateTime_)(uint16_t* date, uint16_t* time);
+  static uint8_t make83Name(const char* str, uint8_t* name);
+  uint8_t openCachedEntry(uint8_t cacheIndex, uint8_t oflags);
+  dir_t* readDirCache(void);
+};
+//==============================================================================
+// SdVolume class
+/**
+ * \brief Cache for an SD data block
+ */
+union cache_t {
+           /** Used to access cached file data blocks. */
+  uint8_t  data[512];
+           /** Used to access cached FAT16 entries. */
+  uint16_t fat16[256];
+           /** Used to access cached FAT32 entries. */
+  uint32_t fat32[128];
+           /** Used to access cached directory entries. */
+  dir_t    dir[16];
+           /** Used to access a cached MasterBoot Record. */
+  mbr_t    mbr;
+           /** Used to access to a cached FAT boot sector. */
+  fbs_t    fbs;
+};
+//------------------------------------------------------------------------------
+/**
+ * \class SdVolume
+ * \brief Access FAT16 and FAT32 volumes on SD and SDHC cards.
+ */
+class SdVolume {
+ public:
+  /** Create an instance of SdVolume */
+  SdVolume(void) :allocSearchStart_(2), fatType_(0) {}
+  /** Clear the cache and returns a pointer to the cache.  Used by the WaveRP
+   *  recorder to do raw write to the SD card.  Not for normal apps.
+   */
+  static uint8_t* cacheClear(void) {
+    cacheFlush();
+    cacheBlockNumber_ = 0XFFFFFFFF;
+    return cacheBuffer_.data;
+  }
+  /**
+   * Initialize a FAT volume.  Try partition one first then try super
+   * floppy format.
+   *
+   * \param[in] dev The Sd2Card where the volume is located.
+   *
+   * \return The value one, true, is returned for success and
+   * the value zero, false, is returned for failure.  Reasons for
+   * failure include not finding a valid partition, not finding a valid
+   * FAT file system or an I/O error.
+   */
+  uint8_t init(Sd2Card* dev) { return init(dev, 1) ? true : init(dev, 0);}
+  uint8_t init(Sd2Card* dev, uint8_t part);
+
+  // inline functions that return volume info
+  /** \return The volume's cluster size in blocks. */
+  uint8_t blocksPerCluster(void) const {return blocksPerCluster_;}
+  /** \return The number of blocks in one FAT. */
+  uint32_t blocksPerFat(void)  const {return blocksPerFat_;}
+  /** \return The total number of clusters in the volume. */
+  uint32_t clusterCount(void) const {return clusterCount_;}
+  /** \return The shift count required to multiply by blocksPerCluster. */
+  uint8_t clusterSizeShift(void) const {return clusterSizeShift_;}
+  /** \return The logical block number for the start of file data. */
+  uint32_t dataStartBlock(void) const {return dataStartBlock_;}
+  /** \return The number of FAT structures on the volume. */
+  uint8_t fatCount(void) const {return fatCount_;}
+  /** \return The logical block number for the start of the first FAT. */
+  uint32_t fatStartBlock(void) const {return fatStartBlock_;}
+  /** \return The FAT type of the volume. Values are 12, 16 or 32. */
+  uint8_t fatType(void) const {return fatType_;}
+  /** \return The number of entries in the root directory for FAT16 volumes. */
+  uint32_t rootDirEntryCount(void) const {return rootDirEntryCount_;}
+  /** \return The logical block number for the start of the root directory
+       on FAT16 volumes or the first cluster number on FAT32 volumes. */
+  uint32_t rootDirStart(void) const {return rootDirStart_;}
+  /** return a pointer to the Sd2Card object for this volume */
+  static Sd2Card* sdCard(void) {return sdCard_;}
+//------------------------------------------------------------------------------
+#if ALLOW_DEPRECATED_FUNCTIONS
+  // Deprecated functions  - suppress cpplint warnings with NOLINT comment
+  /** \deprecated Use: uint8_t SdVolume::init(Sd2Card* dev); */
+  uint8_t init(Sd2Card& dev) {return init(&dev);}  // NOLINT
+
+  /** \deprecated Use: uint8_t SdVolume::init(Sd2Card* dev, uint8_t vol); */
+  uint8_t init(Sd2Card& dev, uint8_t part) {  // NOLINT
+    return init(&dev, part);
+  }
+#endif  // ALLOW_DEPRECATED_FUNCTIONS
+//------------------------------------------------------------------------------
+  private:
+  // Allow SdFile access to SdVolume private data.
+  friend class SdFile;
+
+  // value for action argument in cacheRawBlock to indicate read from cache
+  static uint8_t const CACHE_FOR_READ = 0;
+  // value for action argument in cacheRawBlock to indicate cache dirty
+  static uint8_t const CACHE_FOR_WRITE = 1;
+
+  static cache_t cacheBuffer_;        // 512 byte cache for device blocks
+  static uint32_t cacheBlockNumber_;  // Logical number of block in the cache
+  static Sd2Card* sdCard_;            // Sd2Card object for cache
+  static uint8_t cacheDirty_;         // cacheFlush() will write block if true
+  static uint32_t cacheMirrorBlock_;  // block number for mirror FAT
+//
+  uint32_t allocSearchStart_;   // start cluster for alloc search
+  uint8_t blocksPerCluster_;    // cluster size in blocks
+  uint32_t blocksPerFat_;       // FAT size in blocks
+  uint32_t clusterCount_;       // clusters in one FAT
+  uint8_t clusterSizeShift_;    // shift to convert cluster count to block count
+  uint32_t dataStartBlock_;     // first data block number
+  uint8_t fatCount_;            // number of FATs on volume
+  uint32_t fatStartBlock_;      // start block for first FAT
+  uint8_t fatType_;             // volume type (12, 16, OR 32)
+  uint16_t rootDirEntryCount_;  // number of entries in FAT16 root dir
+  uint32_t rootDirStart_;       // root start block for FAT16, cluster for FAT32
+  //----------------------------------------------------------------------------
+  uint8_t allocContiguous(uint32_t count, uint32_t* curCluster);
+  uint8_t blockOfCluster(uint32_t position) const {
+          return (position >> 9) & (blocksPerCluster_ - 1);}
+  uint32_t clusterStartBlock(uint32_t cluster) const {
+           return dataStartBlock_ + ((cluster - 2) << clusterSizeShift_);}
+  uint32_t blockNumber(uint32_t cluster, uint32_t position) const {
+           return clusterStartBlock(cluster) + blockOfCluster(position);}
+  static uint8_t cacheFlush(void);
+  static uint8_t cacheRawBlock(uint32_t blockNumber, uint8_t action);
+  static void cacheSetDirty(void) {cacheDirty_ |= CACHE_FOR_WRITE;}
+  static uint8_t cacheZeroBlock(uint32_t blockNumber);
+  uint8_t chainSize(uint32_t beginCluster, uint32_t* size) const;
+  uint8_t fatGet(uint32_t cluster, uint32_t* value) const;
+  uint8_t fatPut(uint32_t cluster, uint32_t value);
+  uint8_t fatPutEOC(uint32_t cluster) {
+    return fatPut(cluster, 0x0FFFFFFF);
+  }
+  uint8_t freeChain(uint32_t cluster);
+  uint8_t isEOC(uint32_t cluster) const {
+    return  cluster >= (fatType_ == 16 ? FAT16EOC_MIN : FAT32EOC_MIN);
+  }
+  uint8_t readBlock(uint32_t block, uint8_t* dst) {
+    return sdCard_->readBlock(block, dst);}
+  uint8_t readData(uint32_t block, uint16_t offset,
+    uint16_t count, uint8_t* dst) {
+      return sdCard_->readData(block, offset, count, dst);
+  }
+  uint8_t writeBlock(uint32_t block, const uint8_t* dst) {
+    return sdCard_->writeBlock(block, dst);
+  }
+};
+#endif  // SdFat_h

utility/SdFatUtil.h

@@ -0,0 +1,71 @@
+/* Arduino SdFat Library
+ * Copyright (C) 2008 by William Greiman
+ *
+ * This file is part of the Arduino SdFat Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino SdFat Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+#ifndef SdFatUtil_h
+#define SdFatUtil_h
+/**
+ * \file
+ * Useful utility functions.
+ */
+#include <Arduino.h>
+#include <avr/pgmspace.h>
+/** Store and print a string in flash memory.*/
+#define PgmPrint(x) SerialPrint_P(PSTR(x))
+/** Store and print a string in flash memory followed by a CR/LF.*/
+#define PgmPrintln(x) SerialPrintln_P(PSTR(x))
+/** Defined so doxygen works for function definitions. */
+#define NOINLINE __attribute__((noinline,unused))
+#define UNUSEDOK __attribute__((unused))
+//------------------------------------------------------------------------------
+/** Return the number of bytes currently free in RAM. */
+static UNUSEDOK int FreeRam(void) {
+  extern int  __bss_end;
+  extern int* __brkval;
+  int free_memory;
+  if (reinterpret_cast<int>(__brkval) == 0) {
+    // if no heap use from end of bss section
+    free_memory = reinterpret_cast<int>(&free_memory)
+                  - reinterpret_cast<int>(&__bss_end);
+  } else {
+    // use from top of stack to heap
+    free_memory = reinterpret_cast<int>(&free_memory)
+                  - reinterpret_cast<int>(__brkval);
+  }
+  return free_memory;
+}
+//------------------------------------------------------------------------------
+/**
+ * %Print a string in flash memory to the serial port.
+ *
+ * \param[in] str Pointer to string stored in flash memory.
+ */
+static NOINLINE void SerialPrint_P(PGM_P str) {
+  for (uint8_t c; (c = pgm_read_byte(str)); str++) Serial.write(c);
+}
+//------------------------------------------------------------------------------
+/**
+ * %Print a string in flash memory followed by a CR/LF.
+ *
+ * \param[in] str Pointer to string stored in flash memory.
+ */
+static NOINLINE void SerialPrintln_P(PGM_P str) {
+  SerialPrint_P(str);
+  Serial.println();
+}
+#endif  // #define SdFatUtil_h

utility/SdFatmainpage.h

@@ -0,0 +1,202 @@
+/* Arduino SdFat Library
+ * Copyright (C) 2009 by William Greiman
+ *  
+ * This file is part of the Arduino SdFat Library
+ *  
+ * This Library is free software: you can redistribute it and/or modify 
+ * it under the terms of the GNU General Public License as published by 
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino SdFat Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+/**
+\mainpage Arduino SdFat Library
+<CENTER>Copyright &copy; 2009 by William Greiman
+</CENTER>
+
+\section Intro Introduction
+The Arduino SdFat Library is a minimal implementation of FAT16 and FAT32
+file systems on SD flash memory cards.  Standard SD and high capacity
+SDHC cards are supported.
+
+The SdFat only supports short 8.3 names.
+
+The main classes in SdFat are Sd2Card, SdVolume, and SdFile.
+
+The Sd2Card class supports access to standard SD cards and SDHC cards.  Most
+applications will only need to call the Sd2Card::init() member function.
+
+The SdVolume class supports FAT16 and FAT32 partitions.  Most applications
+will only need to call the SdVolume::init() member function.
+
+The SdFile class provides file access functions such as open(), read(),
+remove(), write(), close() and sync(). This class supports access to the root
+directory and subdirectories.
+
+A number of example are provided in the SdFat/examples folder.  These were
+developed to test SdFat and illustrate its use.
+
+SdFat was developed for high speed data recording.  SdFat was used to implement
+an audio record/play class, WaveRP, for the Adafruit Wave Shield.  This
+application uses special Sd2Card calls to write to contiguous files in raw mode.
+These functions reduce write latency so that audio can be recorded with the
+small amount of RAM in the Arduino.
+
+\section SDcard SD\SDHC Cards
+
+Arduinos access SD cards using the cards SPI protocol.  PCs, Macs, and
+most consumer devices use the 4-bit parallel SD protocol.  A card that
+functions well on A PC or Mac may not work well on the Arduino.
+
+Most cards have good SPI read performance but cards vary widely in SPI
+write performance.  Write performance is limited by how efficiently the
+card manages internal erase/remapping operations.  The Arduino cannot
+optimize writes to reduce erase operations because of its limit RAM.
+
+SanDisk cards generally have good write performance.  They seem to have
+more internal RAM buffering than other cards and therefore can limit
+the number of flash erase operations that the Arduino forces due to its
+limited RAM.
+
+\section Hardware Hardware Configuration
+
+SdFat was developed using an
+<A HREF = "http://www.adafruit.com/"> Adafruit Industries</A> 
+<A HREF = "http://www.ladyada.net/make/waveshield/"> Wave Shield</A>.
+
+The hardware interface to the SD card should not use a resistor based level
+shifter.  SdFat sets the SPI bus frequency to 8 MHz which results in signal
+rise times that are too slow for the edge detectors in many newer SD card
+controllers when resistor voltage dividers are used.
+
+The 5 to 3.3 V level shifter for 5 V Arduinos should be IC based like the
+74HC4050N based circuit shown in the file SdLevel.png.  The Adafruit Wave Shield
+uses a 74AHC125N.  Gravitech sells SD and MicroSD Card Adapters based on the
+74LCX245.
+
+If you are using a resistor based level shifter and are having problems try
+setting the SPI bus frequency to 4 MHz.  This can be done by using 
+card.init(SPI_HALF_SPEED) to initialize the SD card.
+
+\section comment Bugs and Comments
+
+If you wish to report bugs or have comments, send email to fat16lib@sbcglobal.net.
+
+\section SdFatClass SdFat Usage
+
+SdFat uses a slightly restricted form of short names.
+Only printable ASCII characters are supported. No characters with code point
+values greater than 127 are allowed.  Space is not allowed even though space
+was allowed in the API of early versions of DOS.
+
+Short names are limited to 8 characters followed by an optional period (.)
+and extension of up to 3 characters.  The characters may be any combination
+of letters and digits.  The following special characters are also allowed:
+
+$ % ' - _ @ ~ ` ! ( ) { } ^ # &
+
+Short names are always converted to upper case and their original case
+value is lost.
+
+\note
+  The Arduino Print class uses character
+at a time writes so it was necessary to use a \link SdFile::sync() sync() \endlink
+function to control when data is written to the SD card.
+
+\par
+An application which writes to a file using \link Print::print() print()\endlink,
+\link Print::println() println() \endlink
+or \link SdFile::write write() \endlink must call \link SdFile::sync() sync() \endlink
+at the appropriate time to force data and directory information to be written
+to the SD Card.  Data and directory information are also written to the SD card
+when \link SdFile::close() close() \endlink is called.
+
+\par
+Applications must use care calling \link SdFile::sync() sync() \endlink
+since 2048 bytes of I/O is required to update file and
+directory information.  This includes writing the current data block, reading
+the block that contains the directory entry for update, writing the directory
+block back and reading back the current data block.
+
+It is possible to open a file with two or more instances of SdFile.  A file may
+be corrupted if data is written to the file by more than one instance of SdFile.
+
+\section HowTo How to format SD Cards as FAT Volumes
+
+You should use a freshly formatted SD card for best performance.  FAT
+file systems become slower if many files have been created and deleted.
+This is because the directory entry for a deleted file is marked as deleted,
+but is not deleted.  When a new file is created, these entries must be scanned
+before creating the file, a flaw in the FAT design.  Also files can become
+fragmented which causes reads and writes to be slower.
+
+Microsoft operating systems support removable media formatted with a
+Master Boot Record, MBR, or formatted as a super floppy with a FAT Boot Sector
+in block zero.
+
+Microsoft operating systems expect MBR formatted removable media
+to have only one partition. The first partition should be used.
+
+Microsoft operating systems do not support partitioning SD flash cards.
+If you erase an SD card with a program like KillDisk, Most versions of
+Windows will format the card as a super floppy.
+
+The best way to restore an SD card's format is to use SDFormatter
+which can be downloaded from:
+
+http://www.sdcard.org/consumers/formatter/
+
+SDFormatter aligns flash erase boundaries with file
+system structures which reduces write latency and file system overhead.
+
+SDFormatter does not have an option for FAT type so it may format
+small cards as FAT12.
+
+After the MBR is restored by SDFormatter you may need to reformat small
+cards that have been formatted FAT12 to force the volume type to be FAT16.
+
+If you reformat the SD card with an OS utility, choose a cluster size that
+will result in:
+
+4084 < CountOfClusters && CountOfClusters < 65525
+
+The volume will then be FAT16.
+
+If you are formatting an SD card on OS X or Linux, be sure to use the first
+partition. Format this partition with a cluster count in above range.
+
+\section  References References
+
+Adafruit Industries:
+
+http://www.adafruit.com/
+
+http://www.ladyada.net/make/waveshield/
+
+The Arduino site:
+
+http://www.arduino.cc/
+
+For more information about FAT file systems see:
+
+http://www.microsoft.com/whdc/system/platform/firmware/fatgen.mspx
+
+For information about using SD cards as SPI devices see:
+
+http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
+
+The ATmega328 datasheet:
+
+http://www.atmel.com/dyn/resources/prod_documents/doc8161.pdf
+ 
+
+ */  

utility/SdInfo.h

@@ -0,0 +1,232 @@
+/* Arduino Sd2Card Library
+ * Copyright (C) 2009 by William Greiman
+ *
+ * This file is part of the Arduino Sd2Card Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino Sd2Card Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+#ifndef SdInfo_h
+#define SdInfo_h
+#include <stdint.h>
+// Based on the document:
+//
+// SD Specifications
+// Part 1
+// Physical Layer
+// Simplified Specification
+// Version 2.00
+// September 25, 2006
+//
+// www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
+//------------------------------------------------------------------------------
+// SD card commands
+/** GO_IDLE_STATE - init card in spi mode if CS low */
+uint8_t const CMD0 = 0X00;
+/** SEND_IF_COND - verify SD Memory Card interface operating condition.*/
+uint8_t const CMD8 = 0X08;
+/** SEND_CSD - read the Card Specific Data (CSD register) */
+uint8_t const CMD9 = 0X09;
+/** SEND_CID - read the card identification information (CID register) */
+uint8_t const CMD10 = 0X0A;
+/** SEND_STATUS - read the card status register */
+uint8_t const CMD13 = 0X0D;
+/** READ_BLOCK - read a single data block from the card */
+uint8_t const CMD17 = 0X11;
+/** WRITE_BLOCK - write a single data block to the card */
+uint8_t const CMD24 = 0X18;
+/** WRITE_MULTIPLE_BLOCK - write blocks of data until a STOP_TRANSMISSION */
+uint8_t const CMD25 = 0X19;
+/** ERASE_WR_BLK_START - sets the address of the first block to be erased */
+uint8_t const CMD32 = 0X20;
+/** ERASE_WR_BLK_END - sets the address of the last block of the continuous
+    range to be erased*/
+uint8_t const CMD33 = 0X21;
+/** ERASE - erase all previously selected blocks */
+uint8_t const CMD38 = 0X26;
+/** APP_CMD - escape for application specific command */
+uint8_t const CMD55 = 0X37;
+/** READ_OCR - read the OCR register of a card */
+uint8_t const CMD58 = 0X3A;
+/** SET_WR_BLK_ERASE_COUNT - Set the number of write blocks to be
+     pre-erased before writing */
+uint8_t const ACMD23 = 0X17;
+/** SD_SEND_OP_COMD - Sends host capacity support information and
+    activates the card's initialization process */
+uint8_t const ACMD41 = 0X29;
+//------------------------------------------------------------------------------
+/** status for card in the ready state */
+uint8_t const R1_READY_STATE = 0X00;
+/** status for card in the idle state */
+uint8_t const R1_IDLE_STATE = 0X01;
+/** status bit for illegal command */
+uint8_t const R1_ILLEGAL_COMMAND = 0X04;
+/** start data token for read or write single block*/
+uint8_t const DATA_START_BLOCK = 0XFE;
+/** stop token for write multiple blocks*/
+uint8_t const STOP_TRAN_TOKEN = 0XFD;
+/** start data token for write multiple blocks*/
+uint8_t const WRITE_MULTIPLE_TOKEN = 0XFC;
+/** mask for data response tokens after a write block operation */
+uint8_t const DATA_RES_MASK = 0X1F;
+/** write data accepted token */
+uint8_t const DATA_RES_ACCEPTED = 0X05;
+//------------------------------------------------------------------------------
+typedef struct CID {
+  // byte 0
+  uint8_t mid;  // Manufacturer ID
+  // byte 1-2
+  char oid[2];  // OEM/Application ID
+  // byte 3-7
+  char pnm[5];  // Product name
+  // byte 8
+  unsigned prv_m : 4;  // Product revision n.m
+  unsigned prv_n : 4;
+  // byte 9-12
+  uint32_t psn;  // Product serial number
+  // byte 13
+  unsigned mdt_year_high : 4;  // Manufacturing date
+  unsigned reserved : 4;
+  // byte 14
+  unsigned mdt_month : 4;
+  unsigned mdt_year_low :4;
+  // byte 15
+  unsigned always1 : 1;
+  unsigned crc : 7;
+}cid_t;
+//------------------------------------------------------------------------------
+// CSD for version 1.00 cards
+typedef struct CSDV1 {
+  // byte 0
+  unsigned reserved1 : 6;
+  unsigned csd_ver : 2;
+  // byte 1
+  uint8_t taac;
+  // byte 2
+  uint8_t nsac;
+  // byte 3
+  uint8_t tran_speed;
+  // byte 4
+  uint8_t ccc_high;
+  // byte 5
+  unsigned read_bl_len : 4;
+  unsigned ccc_low : 4;
+  // byte 6
+  unsigned c_size_high : 2;
+  unsigned reserved2 : 2;
+  unsigned dsr_imp : 1;
+  unsigned read_blk_misalign :1;
+  unsigned write_blk_misalign : 1;
+  unsigned read_bl_partial : 1;
+  // byte 7
+  uint8_t c_size_mid;
+  // byte 8
+  unsigned vdd_r_curr_max : 3;
+  unsigned vdd_r_curr_min : 3;
+  unsigned c_size_low :2;
+  // byte 9
+  unsigned c_size_mult_high : 2;
+  unsigned vdd_w_cur_max : 3;
+  unsigned vdd_w_curr_min : 3;
+  // byte 10
+  unsigned sector_size_high : 6;
+  unsigned erase_blk_en : 1;
+  unsigned c_size_mult_low : 1;
+  // byte 11
+  unsigned wp_grp_size : 7;
+  unsigned sector_size_low : 1;
+  // byte 12
+  unsigned write_bl_len_high : 2;
+  unsigned r2w_factor : 3;
+  unsigned reserved3 : 2;
+  unsigned wp_grp_enable : 1;
+  // byte 13
+  unsigned reserved4 : 5;
+  unsigned write_partial : 1;
+  unsigned write_bl_len_low : 2;
+  // byte 14
+  unsigned reserved5: 2;
+  unsigned file_format : 2;
+  unsigned tmp_write_protect : 1;
+  unsigned perm_write_protect : 1;
+  unsigned copy : 1;
+  unsigned file_format_grp : 1;
+  // byte 15
+  unsigned always1 : 1;
+  unsigned crc : 7;
+}csd1_t;
+//------------------------------------------------------------------------------
+// CSD for version 2.00 cards
+typedef struct CSDV2 {
+  // byte 0
+  unsigned reserved1 : 6;
+  unsigned csd_ver : 2;
+  // byte 1
+  uint8_t taac;
+  // byte 2
+  uint8_t nsac;
+  // byte 3
+  uint8_t tran_speed;
+  // byte 4
+  uint8_t ccc_high;
+  // byte 5
+  unsigned read_bl_len : 4;
+  unsigned ccc_low : 4;
+  // byte 6
+  unsigned reserved2 : 4;
+  unsigned dsr_imp : 1;
+  unsigned read_blk_misalign :1;
+  unsigned write_blk_misalign : 1;
+  unsigned read_bl_partial : 1;
+  // byte 7
+  unsigned reserved3 : 2;
+  unsigned c_size_high : 6;
+  // byte 8
+  uint8_t c_size_mid;
+  // byte 9
+  uint8_t c_size_low;
+  // byte 10
+  unsigned sector_size_high : 6;
+  unsigned erase_blk_en : 1;
+  unsigned reserved4 : 1;
+  // byte 11
+  unsigned wp_grp_size : 7;
+  unsigned sector_size_low : 1;
+  // byte 12
+  unsigned write_bl_len_high : 2;
+  unsigned r2w_factor : 3;
+  unsigned reserved5 : 2;
+  unsigned wp_grp_enable : 1;
+  // byte 13
+  unsigned reserved6 : 5;
+  unsigned write_partial : 1;
+  unsigned write_bl_len_low : 2;
+  // byte 14
+  unsigned reserved7: 2;
+  unsigned file_format : 2;
+  unsigned tmp_write_protect : 1;
+  unsigned perm_write_protect : 1;
+  unsigned copy : 1;
+  unsigned file_format_grp : 1;
+  // byte 15
+  unsigned always1 : 1;
+  unsigned crc : 7;
+}csd2_t;
+//------------------------------------------------------------------------------
+// union of old and new style CSD register
+union csd_t {
+  csd1_t v1;
+  csd2_t v2;
+};
+#endif  // SdInfo_h

utility/SdVolume.cpp

@@ -0,0 +1,295 @@
+/* Arduino SdFat Library
+ * Copyright (C) 2009 by William Greiman
+ *
+ * This file is part of the Arduino SdFat Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino SdFat Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+#include <SdFat.h>
+//------------------------------------------------------------------------------
+// raw block cache
+// init cacheBlockNumber_to invalid SD block number
+uint32_t SdVolume::cacheBlockNumber_ = 0XFFFFFFFF;
+cache_t  SdVolume::cacheBuffer_;     // 512 byte cache for Sd2Card
+Sd2Card* SdVolume::sdCard_;          // pointer to SD card object
+uint8_t  SdVolume::cacheDirty_ = 0;  // cacheFlush() will write block if true
+uint32_t SdVolume::cacheMirrorBlock_ = 0;  // mirror  block for second FAT
+//------------------------------------------------------------------------------
+// find a contiguous group of clusters
+uint8_t SdVolume::allocContiguous(uint32_t count, uint32_t* curCluster) {
+  // start of group
+  uint32_t bgnCluster;
+
+  // flag to save place to start next search
+  uint8_t setStart;
+
+  // set search start cluster
+  if (*curCluster) {
+    // try to make file contiguous
+    bgnCluster = *curCluster + 1;
+
+    // don't save new start location
+    setStart = false;
+  } else {
+    // start at likely place for free cluster
+    bgnCluster = allocSearchStart_;
+
+    // save next search start if one cluster
+    setStart = 1 == count;
+  }
+  // end of group
+  uint32_t endCluster = bgnCluster;
+
+  // last cluster of FAT
+  uint32_t fatEnd = clusterCount_ + 1;
+
+  // search the FAT for free clusters
+  for (uint32_t n = 0;; n++, endCluster++) {
+    // can't find space checked all clusters
+    if (n >= clusterCount_) return false;
+
+    // past end - start from beginning of FAT
+    if (endCluster > fatEnd) {
+      bgnCluster = endCluster = 2;
+    }
+    uint32_t f;
+    if (!fatGet(endCluster, &f)) return false;
+
+    if (f != 0) {
+      // cluster in use try next cluster as bgnCluster
+      bgnCluster = endCluster + 1;
+    } else if ((endCluster - bgnCluster + 1) == count) {
+      // done - found space
+      break;
+    }
+  }
+  // mark end of chain
+  if (!fatPutEOC(endCluster)) return false;
+
+  // link clusters
+  while (endCluster > bgnCluster) {
+    if (!fatPut(endCluster - 1, endCluster)) return false;
+    endCluster--;
+  }
+  if (*curCluster != 0) {
+    // connect chains
+    if (!fatPut(*curCluster, bgnCluster)) return false;
+  }
+  // return first cluster number to caller
+  *curCluster = bgnCluster;
+
+  // remember possible next free cluster
+  if (setStart) allocSearchStart_ = bgnCluster + 1;
+
+  return true;
+}
+//------------------------------------------------------------------------------
+uint8_t SdVolume::cacheFlush(void) {
+  if (cacheDirty_) {
+    if (!sdCard_->writeBlock(cacheBlockNumber_, cacheBuffer_.data)) {
+      return false;
+    }
+    // mirror FAT tables
+    if (cacheMirrorBlock_) {
+      if (!sdCard_->writeBlock(cacheMirrorBlock_, cacheBuffer_.data)) {
+        return false;
+      }
+      cacheMirrorBlock_ = 0;
+    }
+    cacheDirty_ = 0;
+  }
+  return true;
+}
+//------------------------------------------------------------------------------
+uint8_t SdVolume::cacheRawBlock(uint32_t blockNumber, uint8_t action) {
+  if (cacheBlockNumber_ != blockNumber) {
+    if (!cacheFlush()) return false;
+    if (!sdCard_->readBlock(blockNumber, cacheBuffer_.data)) return false;
+    cacheBlockNumber_ = blockNumber;
+  }
+  cacheDirty_ |= action;
+  return true;
+}
+//------------------------------------------------------------------------------
+// cache a zero block for blockNumber
+uint8_t SdVolume::cacheZeroBlock(uint32_t blockNumber) {
+  if (!cacheFlush()) return false;
+
+  // loop take less flash than memset(cacheBuffer_.data, 0, 512);
+  for (uint16_t i = 0; i < 512; i++) {
+    cacheBuffer_.data[i] = 0;
+  }
+  cacheBlockNumber_ = blockNumber;
+  cacheSetDirty();
+  return true;
+}
+//------------------------------------------------------------------------------
+// return the size in bytes of a cluster chain
+uint8_t SdVolume::chainSize(uint32_t cluster, uint32_t* size) const {
+  uint32_t s = 0;
+  do {
+    if (!fatGet(cluster, &cluster)) return false;
+    s += 512UL << clusterSizeShift_;
+  } while (!isEOC(cluster));
+  *size = s;
+  return true;
+}
+//------------------------------------------------------------------------------
+// Fetch a FAT entry
+uint8_t SdVolume::fatGet(uint32_t cluster, uint32_t* value) const {
+  if (cluster > (clusterCount_ + 1)) return false;
+  uint32_t lba = fatStartBlock_;
+  lba += fatType_ == 16 ? cluster >> 8 : cluster >> 7;
+  if (lba != cacheBlockNumber_) {
+    if (!cacheRawBlock(lba, CACHE_FOR_READ)) return false;
+  }
+  if (fatType_ == 16) {
+    *value = cacheBuffer_.fat16[cluster & 0XFF];
+  } else {
+    *value = cacheBuffer_.fat32[cluster & 0X7F] & FAT32MASK;
+  }
+  return true;
+}
+//------------------------------------------------------------------------------
+// Store a FAT entry
+uint8_t SdVolume::fatPut(uint32_t cluster, uint32_t value) {
+  // error if reserved cluster
+  if (cluster < 2) return false;
+
+  // error if not in FAT
+  if (cluster > (clusterCount_ + 1)) return false;
+
+  // calculate block address for entry
+  uint32_t lba = fatStartBlock_;
+  lba += fatType_ == 16 ? cluster >> 8 : cluster >> 7;
+
+  if (lba != cacheBlockNumber_) {
+    if (!cacheRawBlock(lba, CACHE_FOR_READ)) return false;
+  }
+  // store entry
+  if (fatType_ == 16) {
+    cacheBuffer_.fat16[cluster & 0XFF] = value;
+  } else {
+    cacheBuffer_.fat32[cluster & 0X7F] = value;
+  }
+  cacheSetDirty();
+
+  // mirror second FAT
+  if (fatCount_ > 1) cacheMirrorBlock_ = lba + blocksPerFat_;
+  return true;
+}
+//------------------------------------------------------------------------------
+// free a cluster chain
+uint8_t SdVolume::freeChain(uint32_t cluster) {
+  // clear free cluster location
+  allocSearchStart_ = 2;
+
+  do {
+    uint32_t next;
+    if (!fatGet(cluster, &next)) return false;
+
+    // free cluster
+    if (!fatPut(cluster, 0)) return false;
+
+    cluster = next;
+  } while (!isEOC(cluster));
+
+  return true;
+}
+//------------------------------------------------------------------------------
+/**
+ * Initialize a FAT volume.
+ *
+ * \param[in] dev The SD card where the volume is located.
+ *
+ * \param[in] part The partition to be used.  Legal values for \a part are
+ * 1-4 to use the corresponding partition on a device formatted with
+ * a MBR, Master Boot Record, or zero if the device is formatted as
+ * a super floppy with the FAT boot sector in block zero.
+ *
+ * \return The value one, true, is returned for success and
+ * the value zero, false, is returned for failure.  Reasons for
+ * failure include not finding a valid partition, not finding a valid
+ * FAT file system in the specified partition or an I/O error.
+ */
+uint8_t SdVolume::init(Sd2Card* dev, uint8_t part) {
+  uint32_t volumeStartBlock = 0;
+  sdCard_ = dev;
+  // if part == 0 assume super floppy with FAT boot sector in block zero
+  // if part > 0 assume mbr volume with partition table
+  if (part) {
+    if (part > 4)return false;
+    if (!cacheRawBlock(volumeStartBlock, CACHE_FOR_READ)) return false;
+    part_t* p = &cacheBuffer_.mbr.part[part-1];
+    if ((p->boot & 0X7F) !=0  ||
+      p->totalSectors < 100 ||
+      p->firstSector == 0) {
+      // not a valid partition
+      return false;
+    }
+    volumeStartBlock = p->firstSector;
+  }
+  if (!cacheRawBlock(volumeStartBlock, CACHE_FOR_READ)) return false;
+  bpb_t* bpb = &cacheBuffer_.fbs.bpb;
+  if (bpb->bytesPerSector != 512 ||
+    bpb->fatCount == 0 ||
+    bpb->reservedSectorCount == 0 ||
+    bpb->sectorsPerCluster == 0) {
+       // not valid FAT volume
+      return false;
+  }
+  fatCount_ = bpb->fatCount;
+  blocksPerCluster_ = bpb->sectorsPerCluster;
+
+  // determine shift that is same as multiply by blocksPerCluster_
+  clusterSizeShift_ = 0;
+  while (blocksPerCluster_ != (1 << clusterSizeShift_)) {
+    // error if not power of 2
+    if (clusterSizeShift_++ > 7) return false;
+  }
+  blocksPerFat_ = bpb->sectorsPerFat16 ?
+                    bpb->sectorsPerFat16 : bpb->sectorsPerFat32;
+
+  fatStartBlock_ = volumeStartBlock + bpb->reservedSectorCount;
+
+  // count for FAT16 zero for FAT32
+  rootDirEntryCount_ = bpb->rootDirEntryCount;
+
+  // directory start for FAT16 dataStart for FAT32
+  rootDirStart_ = fatStartBlock_ + bpb->fatCount * blocksPerFat_;
+
+  // data start for FAT16 and FAT32
+  dataStartBlock_ = rootDirStart_ + ((32 * bpb->rootDirEntryCount + 511)/512);
+
+  // total blocks for FAT16 or FAT32
+  uint32_t totalBlocks = bpb->totalSectors16 ?
+                           bpb->totalSectors16 : bpb->totalSectors32;
+  // total data blocks
+  clusterCount_ = totalBlocks - (dataStartBlock_ - volumeStartBlock);
+
+  // divide by cluster size to get cluster count
+  clusterCount_ >>= clusterSizeShift_;
+
+  // FAT type is determined by cluster count
+  if (clusterCount_ < 4085) {
+    fatType_ = 12;
+  } else if (clusterCount_ < 65525) {
+    fatType_ = 16;
+  } else {
+    rootDirStart_ = bpb->fat32RootCluster;
+    fatType_ = 32;
+  }
+  return true;
+}