text: // 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.
  
  #include "vfs_api.h"
  #include "sd_diskio.h"
  #include "ff.h"
  #include "FS.h"
  #include "SD.h"
  
  using namespace fs;
  
  SDFS::SDFS(FSImplPtr impl): FS(impl), _pdrv(0xFF) {}
  
  bool SDFS::begin(uint8_t ssPin, SPIClass &spi, uint32_t frequency, const char * mountpoint)
  {
      if(_pdrv != 0xFF) {
          return true;
      }
  
      spi.begin();
  
      _pdrv = sdcard_init(ssPin, &spi, frequency);
      if(_pdrv == 0xFF) {
          return false;
      }
  
      if(!sdcard_mount(_pdrv, mountpoint)){
          sdcard_uninit(_pdrv);
          _pdrv = 0xFF;
          return false;
      }
  
      _impl->mountpoint(mountpoint);
      return true;
  }
  
  void SDFS::end()
  {
      if(_pdrv != 0xFF) {
          _impl->mountpoint(NULL);
          sdcard_unmount(_pdrv);
  
          sdcard_uninit(_pdrv);
          _pdrv = 0xFF;
      }
  }
  
  sdcard_type_t SDFS::cardType()
  {
      if(_pdrv == 0xFF) {
          return CARD_NONE;
      }
      return sdcard_type(_pdrv);
  }
  
  uint64_t SDFS::cardSize()
  {
      if(_pdrv == 0xFF) {
          return 0;
      }
      size_t sectors = sdcard_num_sectors(_pdrv);
      size_t sectorSize = sdcard_sector_size(_pdrv);
      return (uint64_t)sectors * sectorSize;
  }
  
  uint64_t SDFS::totalBytes()
  {
  	FATFS* fsinfo;
  	DWORD fre_clust;
  	if(f_getfree("0:",&fre_clust,&fsinfo)!= 0) return 0;
      uint64_t size = (fsinfo->csize)*(fsinfo->n_fatent - 2)
  #if _MAX_SS != 512
          *(fsinfo->ssize);
  #else
          *512;
  #endif
  	return size;
  }
  
  uint64_t SDFS::usedBytes()
  {
  	FATFS* fsinfo;
  	DWORD fre_clust;
  	if(f_getfree("0:",&fre_clust,&fsinfo)!= 0) return 0;
  	uint64_t size = (fsinfo->csize)*((fsinfo->n_fatent - 2) - (fsinfo->free_clst))
  #if _MAX_SS != 512
          *(fsinfo->ssize);
  #else
          *512;
  #endif
  	return size;
  }
  
  SDFS SD = SDFS(FSImplPtr(new VFSImpl()));
  