SD end() method

We need call SdFile::close() only if Sd2Card has no errors because SdFile::sync() is called.

Author: sirzeta

Diff for: libraries/SD/src/SD.cpp

@@ -350,6 +350,17 @@ boolean SDClass::begin(uint8_t csPin, uint32_t speed) {
          root.openRoot(volume);
 }
 
+// Ends SD card connection
+void SDClass::end() {
+    if(card.errorCode() == 0 && root.isOpen()) {
+        root.close();
+    }
+
+    root = SdFile();
+    volume = SdVolume();
+    card = Sd2Card();
+}
+
 // this little helper is used to traverse paths
 SdFile SDClass::getParentDir(const char *filepath, int *index) {
   // get parent directory

Diff for: libraries/SD/src/SD.h

@@ -89,6 +89,9 @@ class SDClass {
   // before other methods are used.
   boolean begin(uint8_t csPin = SD_CHIP_SELECT_PIN, uint32_t speed = SPI_HALF_SPEED);
 
+  // Ends SD card connection
+  void end();
+
   // 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.