Nicolas Borla
BBR 1 Ebene
Diff: mbed-os/features/filesystem/bd/ChainingBlockDevice.h
- Revision:
- 0:fbdae7e6d805
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/features/filesystem/bd/ChainingBlockDevice.h Mon May 14 11:29:06 2018 +0000
@@ -0,0 +1,181 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 ARM Limited
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef MBED_CHAINING_BLOCK_DEVICE_H
+#define MBED_CHAINING_BLOCK_DEVICE_H
+
+#include "BlockDevice.h"
+#include "mbed.h"
+
+
+/** Block device for chaining multiple block devices
+ * with the similar block sizes at sequential addresses
+ *
+ * @code
+ * #include "mbed.h"
+ * #include "HeapBlockDevice.h"
+ * #include "ChainingBlockDevice.h"
+ *
+ * // Create two smaller block devices with
+ * // 64 and 32 blocks of size 512 bytes
+ * HeapBlockDevice mem1(64*512, 512);
+ * HeapBlockDevice mem2(32*512, 512);
+ *
+ * // Create a block device backed by mem1 and mem2
+ * // contains 96 blocks of size 512 bytes
+ * BlockDevice *bds[] = {&mem1, &mem2};
+ * ChainingBlockDevice chainmem(bds);
+ * @endcode
+ */
+class ChainingBlockDevice : public BlockDevice
+{
+public:
+ /** Lifetime of the memory block device
+ *
+ * @param bds Array of block devices to chain with sequential block addresses
+ * @param bd_count Number of block devices to chain
+ * @note All block devices must have the same block size
+ */
+ ChainingBlockDevice(BlockDevice **bds, size_t bd_count);
+
+ /** Lifetime of the memory block device
+ *
+ * @param bds Array of block devices to chain with sequential block addresses
+ * @note All block devices must have the same block size
+ */
+ template <size_t Size>
+ ChainingBlockDevice(BlockDevice *(&bds)[Size])
+ : _bds(bds), _bd_count(sizeof(bds) / sizeof(bds[0]))
+ , _read_size(0), _program_size(0), _erase_size(0), _size(0)
+ {
+ }
+
+ /** Lifetime of the memory block device
+ *
+ */
+ virtual ~ChainingBlockDevice() {}
+
+ /** Initialize a block device
+ *
+ * @return 0 on success or a negative error code on failure
+ */
+ virtual int init();
+
+ /** Deinitialize a block device
+ *
+ * @return 0 on success or a negative error code on failure
+ */
+ virtual int deinit();
+
+ /** Ensure data on storage is in sync with the driver
+ *
+ * @return 0 on success or a negative error code on failure
+ */
+ virtual int sync();
+
+ /** Read blocks from a block device
+ *
+ * @param buffer Buffer to write blocks to
+ * @param addr Address of block to begin reading from
+ * @param size Size to read in bytes, must be a multiple of read block size
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int read(void *buffer, bd_addr_t addr, bd_size_t size);
+
+ /** Program blocks to a block device
+ *
+ * The blocks must have been erased prior to being programmed
+ *
+ * @param buffer Buffer of data to write to blocks
+ * @param addr Address of block to begin writing to
+ * @param size Size to write in bytes, must be a multiple of program block size
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int program(const void *buffer, bd_addr_t addr, bd_size_t size);
+
+ /** Erase blocks on a block device
+ *
+ * The state of an erased block is undefined until it has been programmed,
+ * unless get_erase_value returns a non-negative byte value
+ *
+ * @param addr Address of block to begin erasing
+ * @param size Size to erase in bytes, must be a multiple of erase block size
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int erase(bd_addr_t addr, bd_size_t size);
+
+ /** Get the size of a readable block
+ *
+ * @return Size of a readable block in bytes
+ */
+ virtual bd_size_t get_read_size() const;
+
+ /** Get the size of a programmable block
+ *
+ * @return Size of a programmable block in bytes
+ * @note Must be a multiple of the read size
+ */
+ virtual bd_size_t get_program_size() const;
+
+ /** Get the size of an eraseable block
+ *
+ * @return Size of an erasable block in bytes
+ * @note Must be a multiple of the program size
+ */
+ virtual bd_size_t get_erase_size() const;
+
+ /** Get the size of an erasable block given address
+ *
+ * @param addr Address within the erasable block
+ * @return Size of an erasable block in bytes
+ * @note Must be a multiple of the program size
+ */
+ virtual bd_size_t get_erase_size(bd_addr_t addr) const;
+
+ /** Get the value of storage when erased
+ *
+ * If get_erase_value returns a non-negative byte value, the underlying
+ * storage is set to that value when erased, and storage containing
+ * that value can be programmed without another erase.
+ *
+ * @return The value of storage when erased, or -1 if you can't
+ * rely on the value of erased storage
+ */
+ virtual int get_erase_value() const;
+
+ /** Get the total size of the underlying device
+ *
+ * @return Size of the underlying device in bytes
+ */
+ virtual bd_size_t size() const;
+
+protected:
+ BlockDevice **_bds;
+ size_t _bd_count;
+ bd_size_t _read_size;
+ bd_size_t _program_size;
+ bd_size_t _erase_size;
+ bd_size_t _size;
+ int _erase_value;
+};
+
+
+#endif