Free SDCard heap space

src/drivers/storage/SDCard.cpp

@@ -57,6 +57,15 @@ bool SDCard::cardBusy()
     return cardBusy_;
 }
 
+/// @brief End the card to free heap space.
+void SDCard::terminate()
+{
+    iSD_->end();
+#ifdef BUILD_SDSPI
+    ispi_->end(); 
+#endif   
+}
+
 /// @brief Transfer settings from config file on a SD card to the device.
 /// @param nvMemory* where to save
 /// @param TSettings* passing a struct is required, to save memory
@@ -203,5 +212,6 @@ bool SDCard::loadConfigFile(TSettings* Settings) { return false; }
 bool SDCard::initSDcard() { return false; }
 bool SDCard::cardAvailable() { return false; }
 bool SDCard::cardBusy() { return false; }
+void SDCard::terminate() {};
 
 #endif //BUILD_SDMMC

src/drivers/storage/SDCard.h

@@ -55,6 +55,7 @@ public:
     bool loadConfigFile(TSettings* Settings);
     bool cardAvailable();
     bool cardBusy();
+    void terminate();
 private:
     bool initSDcard();
     bool cardInitialized_;

src/wManager.cpp

@@ -109,6 +109,9 @@ void init_WifiManager()
         }
     };
     
+    // Free the memory from SDCard class
+    SDCrd.terminate();
+    
     // Reset settings (only for development)
     //wm.resetSettings();