Added new examples

examples/InteractiveDirectory/InteractiveDirectory.ino

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+/*
+  SD card basic example
+  This example shows how to create and delete an SD card directory.
+
+  The circuit:
+   SD card attached to SPI bus as follows:
+ ** MOSI - pin 11
+ ** MISO - pin 12
+ ** CLK - pin 13
+ ** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)
+  created by Abhijeet Kadam
+   This example code is in the public domain.
+*/
+#include <SPI.h>
+#include <SD.h>
+
+File myFile, root;
+String dir;
+int ch;
+void setup() {
+  // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+  Serial.print("Initializing SD card...");
+  if (!SD.begin(4)) {
+    Serial.println("initialization failed!");
+    while (1);
+  }
+
+  root = SD.open("/"); // create root reference.
+  Serial.println("initialization done.");
+
+  printDirectory(root, 0); // print directory and file list
+  Serial.println("1.Create Directory"); //ask user to input choice
+  Serial.println("2.Delete Directory");
+  Serial.println("Enter your choice:");
+  //wait for input
+  waitip();
+  ch = Serial.parseInt();//get choice input
+  //for creating directory
+  if (ch == 1) {
+    Serial.println("Enter directory name to create:");//ask user for directory name
+    waitip();
+    dir = Serial.readString();
+    dir.trim();
+
+    //if directory already exists
+    if (SD.exists(dir)) {
+      Serial.println(dir + " already exists!");
+    } else {
+      //if directory not exists create one
+      Serial.println(dir + " doesn't exist.");
+      Serial.println("Creating directory..");
+      SD.mkdir(dir);  // creating directory
+
+      if (SD.exists(dir)) {
+        Serial.println(dir + " created!!");
+      } else {
+        Serial.println("Error: " + dir + " not created");
+      }
+    }
+  } else if (ch == 2) {
+    //for deleting directory
+    Serial.println("Enter directory name to delete:");//ask user for directory name
+    waitip();
+    dir = Serial.readString();
+    dir.trim();
+    if (SD.exists(dir)) { //if directory already exists then delete it.
+      SD.rmdir(dir);    //deleting directory.
+
+      if (SD.exists(dir)) {
+        Serial.println("Error: " + dir + " not deleted!!");
+      } else {
+        Serial.println(" " + dir + " deleted!!");
+      }
+    } else {
+      //if directory not exists then show error message.
+      Serial.println("Error: " + dir + " not exists!!");
+    }
+  } else {
+    // if user enters wrong choice
+    Serial.println("Error:wrong choice!!");
+  }
+}
+
+void loop() {
+  // nothing happens after setup finishes.
+}
+
+// wait for user input
+void waitip() {
+  while (Serial.available() == 0)
+  {}
+}
+
+// prints directory list
+void printDirectory(File dir, int numTabs) {
+  while (true) {
+
+    File entry =  dir.openNextFile();
+    if (! entry) {
+      // no more files
+      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();
+  }
+}

examples/InteractiveFile/InteractiveFile.ino

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+/*
+  SD card basic example
+  This example shows how to create and delete 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 (for MKRZero SD: SDCARD_SS_PIN)
+  created by Abhijeet Kadam
+   This example code is in the public domain.
+
+*/
+
+#include <SPI.h>
+#include <SD.h>
+
+File myFile, root;
+int ch;
+String fname;
+
+void setup() {
+  // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  Serial.print("Initializing SD card...");
+
+  if (!SD.begin(4)) {
+    Serial.println("initialization failed!");
+    while (1);
+  }
+  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.
+  root = SD.open("/"); // create root reference.
+  printDirectory(root, 0); // print directory and file list
+  Serial.println("1.Create File"); //ask user to input choice
+  Serial.println("2.Delete File");
+  Serial.println("Enter your choice:");
+  //wait for input
+  waitip();
+  ch = Serial.parseInt();//get choice input
+
+  //for creating file
+  if (ch == 1) {
+    Serial.println("Enter file name to create file:"); //ask user for file name eg. test.txt
+    waitip();
+    fname = Serial.readString();
+    fname.trim();
+    //if file already exists
+    if (SD.exists(fname)) {
+      Serial.println(fname + " already exists!");
+
+    } else {
+      //if file not exists create one
+      Serial.println(fname + " doesn't exist.");
+      Serial.println("Creating file..");
+      myFile = SD.open(fname, FILE_WRITE); // creating file
+      myFile.close();
+      if (SD.exists(fname)) {
+        Serial.println(fname + " created!!");
+      } else {
+        Serial.println("Error: " + fname + " not created");
+      }
+    }
+  } else if (ch == 2) {
+    //for deleting file
+    Serial.println("Enter file name to delete:");//ask user for file name
+    waitip();
+    fname = Serial.readString();
+    fname.trim();
+    //if file already exists then delete it.
+    if (SD.exists(fname)) {
+      SD.remove(fname); // deleting file.
+
+      if (SD.exists(fname)) {
+        Serial.println("Error: " + fname + " not deleted!!");
+      } else {
+        Serial.println(" " + fname + " deleted!!");
+      }
+    } else {
+      //if file not exists then show error message.
+      Serial.println("Error: " + fname + " not exists!!");
+    }
+  } else {
+    // if user enters wrong choice
+    Serial.println("Error:wrong choice!!");
+  }
+}
+
+void loop() {
+  // nothing happens after setup
+}
+
+// wait for user input
+void waitip() {
+  while (Serial.available() == 0)
+  {}
+}
+
+// prints directory list
+void printDirectory(File dir, int numTabs) {
+  while (true) {
+
+    File entry =  dir.openNextFile();
+    if (! entry) {
+      // no more files
+      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();
+  }
+}

examples/InteractiveReadWrite/InteractiveReadWrite.ino

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+/*
+  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 (for MKRZero SD: SDCARD_SS_PIN)
+
+  created by Abhijeet Kadam
+
+  This example code is in the public domain.
+
+*/
+
+#include <SPI.h>
+#include <SD.h>
+
+String fname, fileData;
+int ch;
+File root, 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 native USB port only
+  }
+
+  Serial.print("Initializing SD card...");
+
+  if (!SD.begin(4)) {
+    Serial.println("initialization failed!");
+    while (1);
+  }
+  Serial.println("initialization done.");
+
+  root = SD.open("/"); // create root reference.
+  printDirectory(root, 0); // print directory and file list
+
+  Serial.println("1.Read File"); //ask user to input choice
+  Serial.println("2.Write File");
+  Serial.println("Enter your choice:");
+  //wait for input
+  waitip();
+  ch = Serial.parseInt();//get choice input
+
+  //for reading the file
+  if (ch == 1) {
+    Serial.println("Enter file name to read file data:");//ask user for file name eg. test.txt
+    waitip();
+    fname = Serial.readString();
+    fname.trim();
+
+    if (SD.exists(fname)) {
+      //if file already exists
+
+      myFile = SD.open(fname);
+      if (myFile) {
+        Serial.println(" " + fname);
+        // 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 file not exists show the message
+      Serial.println(fname + " doesn't exist.");
+    }
+  } else if (ch == 2) {
+    //writing to the file
+    Serial.println("Enter file name :");//ask user for file name
+    waitip();
+    fname = Serial.readString();
+    fname.trim();
+
+    myFile = SD.open(fname, FILE_WRITE);//open the file if file not exists create one
+
+    Serial.println("Enter data to store inside the file :");
+    waitip();
+    fileData = Serial.readString();
+    fileData.trim();
+    // if the file opened okay, write to it:
+    if (myFile) {
+      Serial.print("Writing to " + fname + "...");
+      myFile.println(fileData);
+      // close the file:
+      myFile.close();
+      Serial.println("done.");
+    }  else {
+      // if the file didn't open, print an error:
+      Serial.println("error opening test.txt");
+    }
+  } else {
+    // if user enters wrong choice
+    Serial.println("Error:wrong choice!!");
+  }
+}
+
+void loop() {
+  // nothing happens after setup
+}
+
+// wait for user input
+void waitip() {
+  while (Serial.available() == 0)
+  {}
+}
+
+// prints directory list
+void printDirectory(File dir, int numTabs) {
+  while (true) {
+
+    File entry =  dir.openNextFile();
+    if (! entry) {
+      // no more files
+      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();
+  }
+}