Kev Mann / mbed-dev-OS5_10_4

RTC auf true

features/storage/blockdevice/SlicingBlockDevice.h@2:7aab896b1a3b, 2019-03-13 (annotated)

Committer:
kevman
Date:
Wed Mar 13 11:03:24 2019 +0000
Revision:
2:7aab896b1a3b
Parent:
0:38ceb79fef03 
2019-03-13

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kevman 0:38ceb79fef03 1 /* mbed Microcontroller Library
kevman 0:38ceb79fef03 2 * Copyright (c) 2017 ARM Limited
kevman 0:38ceb79fef03 3 *
kevman 0:38ceb79fef03 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
kevman 0:38ceb79fef03 5 * of this software and associated documentation files (the "Software"), to deal
kevman 0:38ceb79fef03 6 * in the Software without restriction, including without limitation the rights
kevman 0:38ceb79fef03 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
kevman 0:38ceb79fef03 8 * copies of the Software, and to permit persons to whom the Software is
kevman 0:38ceb79fef03 9 * furnished to do so, subject to the following conditions:
kevman 0:38ceb79fef03 10 *
kevman 0:38ceb79fef03 11 * The above copyright notice and this permission notice shall be included in
kevman 0:38ceb79fef03 12 * all copies or substantial portions of the Software.
kevman 0:38ceb79fef03 13 *
kevman 0:38ceb79fef03 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
kevman 0:38ceb79fef03 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
kevman 0:38ceb79fef03 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
kevman 0:38ceb79fef03 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
kevman 0:38ceb79fef03 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
kevman 0:38ceb79fef03 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
kevman 0:38ceb79fef03 20 * SOFTWARE.
kevman 0:38ceb79fef03 21 */
kevman 0:38ceb79fef03 22 #ifndef MBED_SLICING_BLOCK_DEVICE_H
kevman 0:38ceb79fef03 23 #define MBED_SLICING_BLOCK_DEVICE_H
kevman 0:38ceb79fef03 24
kevman 0:38ceb79fef03 25 #include "BlockDevice.h"
kevman 0:38ceb79fef03 26 #include "platform/mbed_assert.h"
kevman 0:38ceb79fef03 27
kevman 0:38ceb79fef03 28 /** Block device for mapping to a slice of another block device
kevman 0:38ceb79fef03 29 *
kevman 0:38ceb79fef03 30 * @code
kevman 0:38ceb79fef03 31 * #include "mbed.h"
kevman 0:38ceb79fef03 32 * #include "HeapBlockDevice.h"
kevman 0:38ceb79fef03 33 * #include "SlicingBlockDevice.h"
kevman 0:38ceb79fef03 34 *
kevman 0:38ceb79fef03 35 * // Create a block device with 64 blocks of size 512
kevman 0:38ceb79fef03 36 * HeapBlockDevice mem(64*512, 512);
kevman 0:38ceb79fef03 37 *
kevman 0:38ceb79fef03 38 * // Create a block device that maps to the first 32 blocks
kevman 0:38ceb79fef03 39 * SlicingBlockDevice slice1(&mem, 0*512, 32*512);
kevman 0:38ceb79fef03 40 *
kevman 0:38ceb79fef03 41 * // Create a block device that maps to the last 32 blocks
kevman 0:38ceb79fef03 42 * SlicingBlockDevice slice2(&mem, 32*512);
kevman 0:38ceb79fef03 43 *
kevman 0:38ceb79fef03 44 * // Create a block device that maps to the middle 32 blocks
kevman 0:38ceb79fef03 45 * SlicingBlockDevice slice3(&mem, 16*512, -16*512);
kevman 0:38ceb79fef03 46 * @endcode
kevman 0:38ceb79fef03 47 */
kevman 0:38ceb79fef03 48 class SlicingBlockDevice : public BlockDevice
kevman 0:38ceb79fef03 49 {
kevman 0:38ceb79fef03 50 public:
kevman 0:38ceb79fef03 51 /** Lifetime of the memory block device
kevman 0:38ceb79fef03 52 *
kevman 0:38ceb79fef03 53 * @param bd Block device to back the SlicingBlockDevice
kevman 0:38ceb79fef03 54 * @param start Start block address to map to block 0, negative addresses
kevman 0:38ceb79fef03 55 * are calculated from the end of the underlying block device
kevman 0:38ceb79fef03 56 * @param end End block address to mark the end of the block device,
kevman 0:38ceb79fef03 57 * this block is not mapped, negative addresses are
kevman 0:38ceb79fef03 58 * calculated from the end of the underlying block device.
kevman 0:38ceb79fef03 59 * The default stops at end of the underlying block device.
kevman 0:38ceb79fef03 60 */
kevman 0:38ceb79fef03 61 SlicingBlockDevice(BlockDevice *bd, bd_addr_t start, bd_addr_t end = 0);
kevman 0:38ceb79fef03 62
kevman 0:38ceb79fef03 63 /** Lifetime of a block device
kevman 0:38ceb79fef03 64 */
kevman 0:38ceb79fef03 65 virtual ~SlicingBlockDevice() {};
kevman 0:38ceb79fef03 66
kevman 0:38ceb79fef03 67 /** Initialize a block device
kevman 0:38ceb79fef03 68 *
kevman 0:38ceb79fef03 69 * @return 0 on success or a negative error code on failure
kevman 0:38ceb79fef03 70 */
kevman 0:38ceb79fef03 71 virtual int init();
kevman 0:38ceb79fef03 72
kevman 0:38ceb79fef03 73 /** Deinitialize a block device
kevman 0:38ceb79fef03 74 *
kevman 0:38ceb79fef03 75 * @return 0 on success or a negative error code on failure
kevman 0:38ceb79fef03 76 */
kevman 0:38ceb79fef03 77 virtual int deinit();
kevman 0:38ceb79fef03 78
kevman 0:38ceb79fef03 79 /** Ensure data on storage is in sync with the driver
kevman 0:38ceb79fef03 80 *
kevman 0:38ceb79fef03 81 * @return 0 on success or a negative error code on failure
kevman 0:38ceb79fef03 82 */
kevman 0:38ceb79fef03 83 virtual int sync();
kevman 0:38ceb79fef03 84
kevman 0:38ceb79fef03 85 /** Read blocks from a block device
kevman 0:38ceb79fef03 86 *
kevman 0:38ceb79fef03 87 * @param buffer Buffer to read blocks into
kevman 0:38ceb79fef03 88 * @param addr Address of block to begin reading from
kevman 0:38ceb79fef03 89 * @param size Size to read in bytes, must be a multiple of read block size
kevman 0:38ceb79fef03 90 * @return 0 on success, negative error code on failure
kevman 0:38ceb79fef03 91 */
kevman 0:38ceb79fef03 92 virtual int read(void *buffer, bd_addr_t addr, bd_size_t size);
kevman 0:38ceb79fef03 93
kevman 0:38ceb79fef03 94 /** Program blocks to a block device
kevman 0:38ceb79fef03 95 *
kevman 0:38ceb79fef03 96 * The blocks must have been erased prior to being programmed
kevman 0:38ceb79fef03 97 *
kevman 0:38ceb79fef03 98 * @param buffer Buffer of data to write to blocks
kevman 0:38ceb79fef03 99 * @param addr Address of block to begin writing to
kevman 0:38ceb79fef03 100 * @param size Size to write in bytes, must be a multiple of program block size
kevman 0:38ceb79fef03 101 * @return 0 on success, negative error code on failure
kevman 0:38ceb79fef03 102 */
kevman 0:38ceb79fef03 103 virtual int program(const void *buffer, bd_addr_t addr, bd_size_t size);
kevman 0:38ceb79fef03 104
kevman 0:38ceb79fef03 105 /** Erase blocks on a block device
kevman 0:38ceb79fef03 106 *
kevman 0:38ceb79fef03 107 * The state of an erased block is undefined until it has been programmed,
kevman 0:38ceb79fef03 108 * unless get_erase_value returns a non-negative byte value
kevman 0:38ceb79fef03 109 *
kevman 0:38ceb79fef03 110 * @param addr Address of block to begin erasing
kevman 0:38ceb79fef03 111 * @param size Size to erase in bytes, must be a multiple of erase block size
kevman 0:38ceb79fef03 112 * @return 0 on success, negative error code on failure
kevman 0:38ceb79fef03 113 */
kevman 0:38ceb79fef03 114 virtual int erase(bd_addr_t addr, bd_size_t size);
kevman 0:38ceb79fef03 115
kevman 0:38ceb79fef03 116 /** Get the size of a readable block
kevman 0:38ceb79fef03 117 *
kevman 0:38ceb79fef03 118 * @return Size of a readable block in bytes
kevman 0:38ceb79fef03 119 */
kevman 0:38ceb79fef03 120 virtual bd_size_t get_read_size() const;
kevman 0:38ceb79fef03 121
kevman 0:38ceb79fef03 122 /** Get the size of a programmable block
kevman 0:38ceb79fef03 123 *
kevman 0:38ceb79fef03 124 * @return Size of a programmable block in bytes
kevman 0:38ceb79fef03 125 * @note Must be a multiple of the read size
kevman 0:38ceb79fef03 126 */
kevman 0:38ceb79fef03 127 virtual bd_size_t get_program_size() const;
kevman 0:38ceb79fef03 128
kevman 0:38ceb79fef03 129 /** Get the size of an erasable block
kevman 0:38ceb79fef03 130 *
kevman 0:38ceb79fef03 131 * @return Size of an erasable block in bytes
kevman 0:38ceb79fef03 132 * @note Must be a multiple of the program size
kevman 0:38ceb79fef03 133 */
kevman 0:38ceb79fef03 134 virtual bd_size_t get_erase_size() const;
kevman 0:38ceb79fef03 135
kevman 0:38ceb79fef03 136 /** Get the size of an erasable block given address
kevman 0:38ceb79fef03 137 *
kevman 0:38ceb79fef03 138 * @param addr Address within the erasable block
kevman 0:38ceb79fef03 139 * @return Size of an erasable block in bytes
kevman 0:38ceb79fef03 140 * @note Must be a multiple of the program size
kevman 0:38ceb79fef03 141 */
kevman 0:38ceb79fef03 142 virtual bd_size_t get_erase_size(bd_addr_t addr) const;
kevman 0:38ceb79fef03 143
kevman 0:38ceb79fef03 144 /** Get the value of storage when erased
kevman 0:38ceb79fef03 145 *
kevman 0:38ceb79fef03 146 * If get_erase_value returns a non-negative byte value, the underlying
kevman 0:38ceb79fef03 147 * storage is set to that value when erased, and storage containing
kevman 0:38ceb79fef03 148 * that value can be programmed without another erase.
kevman 0:38ceb79fef03 149 *
kevman 0:38ceb79fef03 150 * @return The value of storage when erased, or -1 if you can't
kevman 0:38ceb79fef03 151 * rely on the value of erased storage
kevman 0:38ceb79fef03 152 */
kevman 0:38ceb79fef03 153 virtual int get_erase_value() const;
kevman 0:38ceb79fef03 154
kevman 0:38ceb79fef03 155 /** Get the total size of the underlying device
kevman 0:38ceb79fef03 156 *
kevman 0:38ceb79fef03 157 * @return Size of the underlying device in bytes
kevman 0:38ceb79fef03 158 */
kevman 0:38ceb79fef03 159 virtual bd_size_t size() const;
kevman 0:38ceb79fef03 160
kevman 0:38ceb79fef03 161 protected:
kevman 0:38ceb79fef03 162 BlockDevice *_bd;
kevman 0:38ceb79fef03 163 bool _start_from_end;
kevman 0:38ceb79fef03 164 bd_size_t _start;
kevman 0:38ceb79fef03 165 bool _stop_from_end;
kevman 0:38ceb79fef03 166 bd_size_t _stop;
kevman 0:38ceb79fef03 167 };
kevman 0:38ceb79fef03 168
kevman 0:38ceb79fef03 169
kevman 0:38ceb79fef03 170 #endif