Add FS, SD and SD_MMC (#256)

libraries/SD/src/SD.h

@@ -0,0 +1,46 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef _SD_H_
+#define _SD_H_
+
+#include "FS.h"
+#include "SPI.h"
+#include "sd_defines.h"
+
+namespace fs
+{
+
+class SDFS : public FS
+{
+protected:
+    uint8_t _pdrv;
+
+public:
+    SDFS(FSImplPtr impl);
+    bool begin(uint8_t ssPin=SS, SPIClass &spi=SPI, uint32_t frequency=4000000, const char * mountpoint="/sd");
+    void end();
+    sdcard_type_t cardType();
+    uint64_t cardSize();
+};
+
+}
+
+extern fs::SDFS SD;
+
+using namespace fs;
+typedef fs::File        SDFile;
+typedef fs::SDFS        SDFileSystemClass;
+#define SDFileSystem    SD
+
+#endif /* _SD_H_ */