Add FS, SD and SD_MMC (#256)

libraries/SD/src/SD.cpp

@@ -0,0 +1,76 @@
+// 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 "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;
+}
+
+SDFS SD = SDFS(FSImplPtr(new VFSImpl()));