Martin Cottrell / microbit-dal

No Changes

Dependencies:   BLE_API mbed-dev-bin nRF51822

Dependents:   microbit

Fork of microbit-dal by Lancaster University

inc/drivers/MicroBitStorage.h@31:87789e55bac7, 2016-07-13 (annotated)

Committer:
LancasterUniversity
Date:
Wed Jul 13 12:18:10 2016 +0100
Revision:
31:87789e55bac7
Parent:
30:db87179335d5
Child:
32:ece16b5987dd
Synchronized with git rev 3923dfff

Author: James Devine

microbit-dal: increase granularity of the system wide timer



Added an mbed Timer instance to maintain a microsecond level timestamp.



Added a function system_timer_current_time_us() which now returns the

time since power on in microseconds.



MicroBitEvents now call system_timer_current_time_us() giving

microsecond level timestamps.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Jonathan Austin 1:8aa5cdb4ab67 1 /*
Jonathan Austin 1:8aa5cdb4ab67 2 The MIT License (MIT)
Jonathan Austin 1:8aa5cdb4ab67 3
Jonathan Austin 1:8aa5cdb4ab67 4 Copyright (c) 2016 British Broadcasting Corporation.
Jonathan Austin 1:8aa5cdb4ab67 5 This software is provided by Lancaster University by arrangement with the BBC.
Jonathan Austin 1:8aa5cdb4ab67 6
Jonathan Austin 1:8aa5cdb4ab67 7 Permission is hereby granted, free of charge, to any person obtaining a
Jonathan Austin 1:8aa5cdb4ab67 8 copy of this software and associated documentation files (the "Software"),
Jonathan Austin 1:8aa5cdb4ab67 9 to deal in the Software without restriction, including without limitation
Jonathan Austin 1:8aa5cdb4ab67 10 the rights to use, copy, modify, merge, publish, distribute, sublicense,
Jonathan Austin 1:8aa5cdb4ab67 11 and/or sell copies of the Software, and to permit persons to whom the
Jonathan Austin 1:8aa5cdb4ab67 12 Software is furnished to do so, subject to the following conditions:
Jonathan Austin 1:8aa5cdb4ab67 13
Jonathan Austin 1:8aa5cdb4ab67 14 The above copyright notice and this permission notice shall be included in
Jonathan Austin 1:8aa5cdb4ab67 15 all copies or substantial portions of the Software.
Jonathan Austin 1:8aa5cdb4ab67 16
Jonathan Austin 1:8aa5cdb4ab67 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Jonathan Austin 1:8aa5cdb4ab67 18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Jonathan Austin 1:8aa5cdb4ab67 19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
Jonathan Austin 1:8aa5cdb4ab67 20 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 21 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
Jonathan Austin 1:8aa5cdb4ab67 22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 23 DEALINGS IN THE SOFTWARE.
Jonathan Austin 1:8aa5cdb4ab67 24 */
Jonathan Austin 1:8aa5cdb4ab67 25
Jonathan Austin 1:8aa5cdb4ab67 26 #ifndef MICROBIT_STORAGE_H
Jonathan Austin 1:8aa5cdb4ab67 27 #define MICROBIT_STORAGE_H
Jonathan Austin 1:8aa5cdb4ab67 28
Jonathan Austin 1:8aa5cdb4ab67 29 #include "mbed.h"
Jonathan Austin 1:8aa5cdb4ab67 30 #include "MicroBitConfig.h"
Jonathan Austin 1:8aa5cdb4ab67 31 #include "ManagedString.h"
Jonathan Austin 1:8aa5cdb4ab67 32 #include "ErrorNo.h"
Jonathan Austin 1:8aa5cdb4ab67 33
Jonathan Austin 1:8aa5cdb4ab67 34 #define MICROBIT_STORAGE_MAGIC 0xCAFE
Jonathan Austin 1:8aa5cdb4ab67 35
Jonathan Austin 1:8aa5cdb4ab67 36 #define MICROBIT_STORAGE_BLOCK_SIZE 48
Jonathan Austin 1:8aa5cdb4ab67 37 #define MICROBIT_STORAGE_KEY_SIZE 16
Jonathan Austin 1:8aa5cdb4ab67 38 #define MICROBIT_STORAGE_VALUE_SIZE MICROBIT_STORAGE_BLOCK_SIZE - MICROBIT_STORAGE_KEY_SIZE
Jonathan Austin 1:8aa5cdb4ab67 39
Jonathan Austin 1:8aa5cdb4ab67 40 #define MICROBIT_STORAGE_STORE_PAGE_OFFSET 17 //Use the page just above the BLE Bond Data.
Jonathan Austin 1:8aa5cdb4ab67 41 #define MICROBIT_STORAGE_SCRATCH_PAGE_OFFSET 19 //Use the page just below the BLE Bond Data.
Jonathan Austin 1:8aa5cdb4ab67 42
Jonathan Austin 1:8aa5cdb4ab67 43 struct KeyValuePair
Jonathan Austin 1:8aa5cdb4ab67 44 {
LancasterUniversity 3:d86a4ddc1867 45 uint8_t key[MICROBIT_STORAGE_KEY_SIZE];
LancasterUniversity 3:d86a4ddc1867 46 uint8_t value[MICROBIT_STORAGE_VALUE_SIZE];
Jonathan Austin 1:8aa5cdb4ab67 47 };
Jonathan Austin 1:8aa5cdb4ab67 48
Jonathan Austin 1:8aa5cdb4ab67 49 struct KeyValueStore
Jonathan Austin 1:8aa5cdb4ab67 50 {
Jonathan Austin 1:8aa5cdb4ab67 51 uint32_t magic;
Jonathan Austin 1:8aa5cdb4ab67 52 uint32_t size;
Jonathan Austin 1:8aa5cdb4ab67 53
Jonathan Austin 1:8aa5cdb4ab67 54 KeyValueStore(uint32_t magic, uint32_t size)
Jonathan Austin 1:8aa5cdb4ab67 55 {
Jonathan Austin 1:8aa5cdb4ab67 56 this->magic = magic;
Jonathan Austin 1:8aa5cdb4ab67 57 this->size = size;
Jonathan Austin 1:8aa5cdb4ab67 58 }
Jonathan Austin 1:8aa5cdb4ab67 59
Jonathan Austin 1:8aa5cdb4ab67 60 KeyValueStore()
Jonathan Austin 1:8aa5cdb4ab67 61 {
Jonathan Austin 1:8aa5cdb4ab67 62 this->magic = 0;
Jonathan Austin 1:8aa5cdb4ab67 63 this->size = 0;
Jonathan Austin 1:8aa5cdb4ab67 64 }
Jonathan Austin 1:8aa5cdb4ab67 65 };
Jonathan Austin 1:8aa5cdb4ab67 66
Jonathan Austin 1:8aa5cdb4ab67 67
Jonathan Austin 1:8aa5cdb4ab67 68 /**
Jonathan Austin 1:8aa5cdb4ab67 69 * Class definition for the MicroBitStorage class.
Jonathan Austin 1:8aa5cdb4ab67 70 * This allows reading and writing of small blocks of data to FLASH memory.
Jonathan Austin 1:8aa5cdb4ab67 71 *
Jonathan Austin 1:8aa5cdb4ab67 72 * This class operates as a key value store, it allows the retrieval, addition
Jonathan Austin 1:8aa5cdb4ab67 73 * and deletion of KeyValuePairs.
Jonathan Austin 1:8aa5cdb4ab67 74 *
Jonathan Austin 1:8aa5cdb4ab67 75 * The first 8 bytes are reserved for the KeyValueStore struct which gives core
Jonathan Austin 1:8aa5cdb4ab67 76 * information such as the number of KeyValuePairs in the store, and whether the
Jonathan Austin 1:8aa5cdb4ab67 77 * store has been initialised.
Jonathan Austin 1:8aa5cdb4ab67 78 *
Jonathan Austin 1:8aa5cdb4ab67 79 * After the KeyValueStore struct, KeyValuePairs are arranged contiguously until
Jonathan Austin 1:8aa5cdb4ab67 80 * the end of the block used as persistent storage.
Jonathan Austin 1:8aa5cdb4ab67 81 *
Jonathan Austin 1:8aa5cdb4ab67 82 * |-------8-------|--------48-------|-----|---------48--------|
Jonathan Austin 1:8aa5cdb4ab67 83 * | KeyValueStore | KeyValuePair[0] | ... | KeyValuePair[N-1] |
Jonathan Austin 1:8aa5cdb4ab67 84 * |---------------|-----------------|-----|-------------------|
Jonathan Austin 1:8aa5cdb4ab67 85 */
Jonathan Austin 1:8aa5cdb4ab67 86 class MicroBitStorage
Jonathan Austin 1:8aa5cdb4ab67 87 {
Jonathan Austin 1:8aa5cdb4ab67 88 /**
Jonathan Austin 1:8aa5cdb4ab67 89 * Function for copying words from one location to another.
Jonathan Austin 1:8aa5cdb4ab67 90 *
Jonathan Austin 1:8aa5cdb4ab67 91 * @param from the address to copy data from.
Jonathan Austin 1:8aa5cdb4ab67 92 *
Jonathan Austin 1:8aa5cdb4ab67 93 * @param to the address to copy the data to.
Jonathan Austin 1:8aa5cdb4ab67 94 *
Jonathan Austin 1:8aa5cdb4ab67 95 * @param sizeInWords the number of words to copy
Jonathan Austin 1:8aa5cdb4ab67 96 */
Jonathan Austin 1:8aa5cdb4ab67 97 void flashCopy(uint32_t* from, uint32_t* to, int sizeInWords);
Jonathan Austin 1:8aa5cdb4ab67 98
Jonathan Austin 1:8aa5cdb4ab67 99 /**
Jonathan Austin 1:8aa5cdb4ab67 100 * Function for populating the scratch page with a KeyValueStore.
Jonathan Austin 1:8aa5cdb4ab67 101 *
Jonathan Austin 1:8aa5cdb4ab67 102 * @param store the KeyValueStore struct to write to the scratch page.
Jonathan Austin 1:8aa5cdb4ab67 103 */
Jonathan Austin 1:8aa5cdb4ab67 104 void scratchKeyValueStore(KeyValueStore store);
Jonathan Austin 1:8aa5cdb4ab67 105
Jonathan Austin 1:8aa5cdb4ab67 106 /**
Jonathan Austin 1:8aa5cdb4ab67 107 * Function for populating the scratch page with a KeyValuePair.
Jonathan Austin 1:8aa5cdb4ab67 108 *
Jonathan Austin 1:8aa5cdb4ab67 109 * @param pair the KeyValuePair struct to write to the scratch page.
Jonathan Austin 1:8aa5cdb4ab67 110 *
Jonathan Austin 1:8aa5cdb4ab67 111 * @param flashPointer the pointer in flash where this KeyValuePair resides. This pointer
Jonathan Austin 1:8aa5cdb4ab67 112 * is used to determine the offset into the scratch page, where the KeyValuePair should
Jonathan Austin 1:8aa5cdb4ab67 113 * be written.
Jonathan Austin 1:8aa5cdb4ab67 114 */
Jonathan Austin 1:8aa5cdb4ab67 115 void scratchKeyValuePair(KeyValuePair pair, uint32_t* flashPointer);
Jonathan Austin 1:8aa5cdb4ab67 116
Jonathan Austin 1:8aa5cdb4ab67 117 public:
Jonathan Austin 1:8aa5cdb4ab67 118
Jonathan Austin 1:8aa5cdb4ab67 119 /**
Jonathan Austin 1:8aa5cdb4ab67 120 * Default constructor.
Jonathan Austin 1:8aa5cdb4ab67 121 *
Jonathan Austin 1:8aa5cdb4ab67 122 * Creates an instance of MicroBitStorage which acts like a KeyValueStore
Jonathan Austin 1:8aa5cdb4ab67 123 * that allows the retrieval, addition and deletion of KeyValuePairs.
Jonathan Austin 1:8aa5cdb4ab67 124 */
Jonathan Austin 1:8aa5cdb4ab67 125 MicroBitStorage();
Jonathan Austin 1:8aa5cdb4ab67 126
Jonathan Austin 1:8aa5cdb4ab67 127 /**
Jonathan Austin 1:8aa5cdb4ab67 128 * Writes the given number of bytes to the address specified.
Jonathan Austin 1:8aa5cdb4ab67 129 *
Jonathan Austin 1:8aa5cdb4ab67 130 * @param buffer the data to write.
Jonathan Austin 1:8aa5cdb4ab67 131 *
Jonathan Austin 1:8aa5cdb4ab67 132 * @param address the location in memory to write to.
Jonathan Austin 1:8aa5cdb4ab67 133 *
Jonathan Austin 1:8aa5cdb4ab67 134 * @param length the number of bytes to write.
Jonathan Austin 1:8aa5cdb4ab67 135 *
Jonathan Austin 1:8aa5cdb4ab67 136 * @note currently not implemented.
Jonathan Austin 1:8aa5cdb4ab67 137 */
Jonathan Austin 1:8aa5cdb4ab67 138 int writeBytes(uint8_t *buffer, uint32_t address, int length);
Jonathan Austin 1:8aa5cdb4ab67 139
Jonathan Austin 1:8aa5cdb4ab67 140 /**
Jonathan Austin 1:8aa5cdb4ab67 141 * Method for erasing a page in flash.
Jonathan Austin 1:8aa5cdb4ab67 142 *
Jonathan Austin 1:8aa5cdb4ab67 143 * @param page_address Address of the first word in the page to be erased.
Jonathan Austin 1:8aa5cdb4ab67 144 */
Jonathan Austin 1:8aa5cdb4ab67 145 void flashPageErase(uint32_t * page_address);
Jonathan Austin 1:8aa5cdb4ab67 146
Jonathan Austin 1:8aa5cdb4ab67 147 /**
Jonathan Austin 1:8aa5cdb4ab67 148 * Method for writing a word of data in flash with a value.
Jonathan Austin 1:8aa5cdb4ab67 149 *
Jonathan Austin 1:8aa5cdb4ab67 150 * @param address Address of the word to change.
Jonathan Austin 1:8aa5cdb4ab67 151 *
Jonathan Austin 1:8aa5cdb4ab67 152 * @param value Value to be written to flash.
Jonathan Austin 1:8aa5cdb4ab67 153 */
Jonathan Austin 1:8aa5cdb4ab67 154 void flashWordWrite(uint32_t * address, uint32_t value);
Jonathan Austin 1:8aa5cdb4ab67 155
Jonathan Austin 1:8aa5cdb4ab67 156 /**
Jonathan Austin 1:8aa5cdb4ab67 157 * Places a given key, and it's corresponding value into flash at the earliest
Jonathan Austin 1:8aa5cdb4ab67 158 * available point.
Jonathan Austin 1:8aa5cdb4ab67 159 *
Jonathan Austin 1:8aa5cdb4ab67 160 * @param key the unique name that should be used as an identifier for the given data.
Jonathan Austin 1:8aa5cdb4ab67 161 * The key is presumed to be null terminated.
Jonathan Austin 1:8aa5cdb4ab67 162 *
Jonathan Austin 1:8aa5cdb4ab67 163 * @param data a pointer to the beginning of the data to be persisted.
Jonathan Austin 1:8aa5cdb4ab67 164 *
LancasterUniversity 31:87789e55bac7 165 * @return MICROBIT_OK on success, or MICROBIT_NO_RESOURCES if the storage page is full
Jonathan Austin 1:8aa5cdb4ab67 166 */
LancasterUniversity 31:87789e55bac7 167 int put(const char* key, uint8_t* data);
Jonathan Austin 1:8aa5cdb4ab67 168
Jonathan Austin 1:8aa5cdb4ab67 169 /**
Jonathan Austin 1:8aa5cdb4ab67 170 * Places a given key, and it's corresponding value into flash at the earliest
Jonathan Austin 1:8aa5cdb4ab67 171 * available point.
Jonathan Austin 1:8aa5cdb4ab67 172 *
Jonathan Austin 1:8aa5cdb4ab67 173 * @param key the unique name that should be used as an identifier for the given data.
Jonathan Austin 1:8aa5cdb4ab67 174 *
Jonathan Austin 1:8aa5cdb4ab67 175 * @param data a pointer to the beginning of the data to be persisted.
Jonathan Austin 1:8aa5cdb4ab67 176 *
LancasterUniversity 31:87789e55bac7 177 * @return MICROBIT_OK on success, or MICROBIT_NO_RESOURCES if the storage page is full
Jonathan Austin 1:8aa5cdb4ab67 178 */
LancasterUniversity 31:87789e55bac7 179 int put(ManagedString key, uint8_t* data);
Jonathan Austin 1:8aa5cdb4ab67 180
Jonathan Austin 1:8aa5cdb4ab67 181 /**
Jonathan Austin 1:8aa5cdb4ab67 182 * Retreives a KeyValuePair identified by a given key.
Jonathan Austin 1:8aa5cdb4ab67 183 *
Jonathan Austin 1:8aa5cdb4ab67 184 * @param key the unique name used to identify a KeyValuePair in flash.
Jonathan Austin 1:8aa5cdb4ab67 185 *
Jonathan Austin 1:8aa5cdb4ab67 186 * @return a pointer to a heap allocated KeyValuePair struct, this pointer will be
Jonathan Austin 1:8aa5cdb4ab67 187 * NULL if the key was not found in storage.
Jonathan Austin 1:8aa5cdb4ab67 188 *
Jonathan Austin 1:8aa5cdb4ab67 189 * @note it is up to the user to free memory after use.
Jonathan Austin 1:8aa5cdb4ab67 190 */
Jonathan Austin 1:8aa5cdb4ab67 191 KeyValuePair* get(const char* key);
Jonathan Austin 1:8aa5cdb4ab67 192
Jonathan Austin 1:8aa5cdb4ab67 193 /**
Jonathan Austin 1:8aa5cdb4ab67 194 * Retreives a KeyValuePair identified by a given key.
Jonathan Austin 1:8aa5cdb4ab67 195 *
Jonathan Austin 1:8aa5cdb4ab67 196 * @param key the unique name used to identify a KeyValuePair in flash.
Jonathan Austin 1:8aa5cdb4ab67 197 *
Jonathan Austin 1:8aa5cdb4ab67 198 * @return a pointer to a heap allocated KeyValuePair struct, this pointer will be
Jonathan Austin 1:8aa5cdb4ab67 199 * NULL if the key was not found in storage.
Jonathan Austin 1:8aa5cdb4ab67 200 *
Jonathan Austin 1:8aa5cdb4ab67 201 * @note it is up to the user to free memory after use.
Jonathan Austin 1:8aa5cdb4ab67 202 */
Jonathan Austin 1:8aa5cdb4ab67 203 KeyValuePair* get(ManagedString key);
Jonathan Austin 1:8aa5cdb4ab67 204
Jonathan Austin 1:8aa5cdb4ab67 205 /**
Jonathan Austin 1:8aa5cdb4ab67 206 * Removes a KeyValuePair identified by a given key.
Jonathan Austin 1:8aa5cdb4ab67 207 *
Jonathan Austin 1:8aa5cdb4ab67 208 * @param key the unique name used to identify a KeyValuePair in flash.
Jonathan Austin 1:8aa5cdb4ab67 209 *
Jonathan Austin 1:8aa5cdb4ab67 210 * @return MICROBIT_OK on success, or MICROBIT_NO_DATA if the given key
Jonathan Austin 1:8aa5cdb4ab67 211 * was not found in flash.
Jonathan Austin 1:8aa5cdb4ab67 212 */
Jonathan Austin 1:8aa5cdb4ab67 213 int remove(const char* key);
Jonathan Austin 1:8aa5cdb4ab67 214
Jonathan Austin 1:8aa5cdb4ab67 215 /**
Jonathan Austin 1:8aa5cdb4ab67 216 * Removes a KeyValuePair identified by a given key.
Jonathan Austin 1:8aa5cdb4ab67 217 *
Jonathan Austin 1:8aa5cdb4ab67 218 * @param key the unique name used to identify a KeyValuePair in flash.
Jonathan Austin 1:8aa5cdb4ab67 219 *
Jonathan Austin 1:8aa5cdb4ab67 220 * @return MICROBIT_OK on success, or MICROBIT_NO_DATA if the given key
Jonathan Austin 1:8aa5cdb4ab67 221 * was not found in flash.
Jonathan Austin 1:8aa5cdb4ab67 222 */
Jonathan Austin 1:8aa5cdb4ab67 223 int remove(ManagedString key);
Jonathan Austin 1:8aa5cdb4ab67 224
Jonathan Austin 1:8aa5cdb4ab67 225 /**
Jonathan Austin 1:8aa5cdb4ab67 226 * The size of the flash based KeyValueStore.
Jonathan Austin 1:8aa5cdb4ab67 227 *
Jonathan Austin 1:8aa5cdb4ab67 228 * @return the number of entries in the key value store
Jonathan Austin 1:8aa5cdb4ab67 229 */
Jonathan Austin 1:8aa5cdb4ab67 230 int size();
Jonathan Austin 1:8aa5cdb4ab67 231 };
Jonathan Austin 1:8aa5cdb4ab67 232
LancasterUniversity 3:d86a4ddc1867 233 #endif