Add close() method for SD

libraries/SD/src/SD.cpp

@@ -350,6 +350,18 @@ boolean SDClass::begin(uint8_t csPin, uint32_t speed) {
          root.openRoot(volume);
 }
 
+
+void SDClass::end() {
+   /*
+
+    Performs to end The SD Card and close the spi connection
+    and to able begin SD Card again without error
+
+   */
+  root.close();
+  card.end();
+}
+
 // this little helper is used to traverse paths
 SdFile SDClass::getParentDir(const char *filepath, int *index) {
   // get parent directory

libraries/SD/src/SD.h

@@ -89,7 +89,11 @@ class SDClass {
   // 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, uint32_t speed = SPI_HALF_SPEED);
-
+
+  //Performs end The SD Card and close the spi connection
+  //and to able begin SD Card again without error
+  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.

libraries/SD/src/utility/Sd2Card.cpp

@@ -350,6 +350,13 @@ uint8_t Sd2Card::init(uint8_t sckRateID, uint8_t chipSelectPin) {
   return false;
 }
 //------------------------------------------------------------------------------
+/**
+ * End SPI Connection
+ */
+void Sd2Card::end(){
+  SPI.end();
+}
+//------------------------------------------------------------------------------
 /**
  * Enable or disable partial block reads.
  *

libraries/SD/src/utility/Sd2Card.h

@@ -200,6 +200,10 @@ class Sd2Card {
   }
   uint8_t init(uint8_t sckRateID, uint8_t chipSelectPin);
   #endif
+  /**
+   * End SPI Connection
+   */
+  void end();
   void partialBlockRead(uint8_t value);
   /** Returns the current value, true or false, for partial block read. */
   uint8_t partialBlockRead(void) const {return partialBlockRead_;}