Thomas Butler
fsdfds
Dependencies: BLE_API mbed-dev-bin nRF51822
Fork of
microbit-dal
by 
Lancaster University
source/drivers/MicroBitStorage.cpp@1:8aa5cdb4ab67, 2016-04-07 (annotated)
- Committer:
- Jonathan Austin
- Date:
- Thu Apr 07 01:33:22 2016 +0100
- Revision:
- 1:8aa5cdb4ab67
- Child:
- 30:db87179335d5
Synchronized with git rev 55cb9199
Who changed what in which revision?
| User | Revision | Line number | New 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 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 27 | * Class definition for the MicroBitStorage class. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 28 | * This allows reading and writing of FLASH memory. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 29 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 30 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 31 | #include "MicroBitConfig.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 32 | #include "MicroBitStorage.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 33 | #include "MicroBitCompat.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 34 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 35 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 36 | * Default constructor. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 37 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 38 | * Creates an instance of MicroBitStorage which acts like a KeyValueStore |
| Jonathan Austin |
1:8aa5cdb4ab67 | 39 | * that allows the retrieval, addition and deletion of KeyValuePairs. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 40 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 41 | MicroBitStorage::MicroBitStorage() |
| Jonathan Austin |
1:8aa5cdb4ab67 | 42 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 43 | //initialise our magic block, if required. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 44 | size(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 45 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 46 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 47 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 48 | * Writes the given number of bytes to the address specified. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 49 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 50 | * @param buffer the data to write. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 51 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 52 | * @param address the location in memory to write to. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 53 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 54 | * @param length the number of bytes to write. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 55 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 56 | * @note currently not implemented. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 57 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 58 | int MicroBitStorage::writeBytes(uint8_t *buffer, uint32_t address, int length) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 59 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 60 | (void) buffer; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 61 | (void) address; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 62 | (void) length; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 63 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 64 | return MICROBIT_OK; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 65 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 66 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 67 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 68 | * Method for erasing a page in flash. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 69 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 70 | * @param page_address Address of the first word in the page to be erased. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 71 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 72 | void MicroBitStorage::flashPageErase(uint32_t * page_address) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 73 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 74 | // Turn on flash erase enable and wait until the NVMC is ready: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 75 | NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Een << NVMC_CONFIG_WEN_Pos); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 76 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 77 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 78 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 79 | // Erase page: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 80 | NRF_NVMC->ERASEPAGE = (uint32_t)page_address; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 81 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 82 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 83 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 84 | // Turn off flash erase enable and wait until the NVMC is ready: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 85 | NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 86 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 87 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 88 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 89 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 90 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 91 | * Function for copying words from one location to another. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 92 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 93 | * @param from the address to copy data from. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 94 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 95 | * @param to the address to copy the data to. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 96 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 97 | * @param sizeInWords the number of words to copy |
| Jonathan Austin |
1:8aa5cdb4ab67 | 98 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 99 | void MicroBitStorage::flashCopy(uint32_t* from, uint32_t* to, int sizeInWords) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 100 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 101 | // Turn on flash write enable and wait until the NVMC is ready: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 102 | NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 103 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 104 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy) {}; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 105 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 106 | for(int i = 0; i < sizeInWords; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 107 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 108 | *(to + i) = *(from + i); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 109 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy) {}; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 110 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 111 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 112 | // Turn off flash write enable and wait until the NVMC is ready: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 113 | NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 114 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy) {}; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 115 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 116 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 117 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 118 | * Method for writing a word of data in flash with a value. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 119 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 120 | * @param address Address of the word to change. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 121 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 122 | * @param value Value to be written to flash. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 123 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 124 | void MicroBitStorage::flashWordWrite(uint32_t * address, uint32_t value) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 125 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 126 | // Turn on flash write enable and wait until the NVMC is ready: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 127 | NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 128 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 129 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 130 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 131 | *address = value; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 132 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 133 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 134 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 135 | // Turn off flash write enable and wait until the NVMC is ready: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 136 | NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 137 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 138 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 139 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 140 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 141 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 142 | * Function for populating the scratch page with a KeyValueStore. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 143 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 144 | * @param store the KeyValueStore struct to write to the scratch page. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 145 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 146 | void MicroBitStorage::scratchKeyValueStore(KeyValueStore store) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 147 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 148 | //calculate our various offsets |
| Jonathan Austin |
1:8aa5cdb4ab67 | 149 | uint32_t *s = (uint32_t *) &store; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 150 | uint32_t pg_size = NRF_FICR->CODEPAGESIZE; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 151 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 152 | uint32_t *scratchPointer = (uint32_t *)(pg_size * (NRF_FICR->CODESIZE - MICROBIT_STORAGE_SCRATCH_PAGE_OFFSET)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 153 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 154 | //KeyValueStore is word aligned. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 155 | int wordsToWrite = sizeof(KeyValueStore) / 4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 156 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 157 | //write the given KeyValueStore |
| Jonathan Austin |
1:8aa5cdb4ab67 | 158 | for (int i = 0; i < wordsToWrite; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 159 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 160 | flashWordWrite(scratchPointer, *s); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 161 | scratchPointer++; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 162 | s++; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 163 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 164 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 165 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 166 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 167 | * Function for populating the scratch page with a KeyValuePair. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 168 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 169 | * @param pair the KeyValuePair struct to write to the scratch page. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 170 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 171 | * @param flashPointer the pointer in flash where this KeyValuePair resides. This pointer |
| Jonathan Austin |
1:8aa5cdb4ab67 | 172 | * is used to determine the offset into the scratch page, where the KeyValuePair should |
| Jonathan Austin |
1:8aa5cdb4ab67 | 173 | * be written. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 174 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 175 | void MicroBitStorage::scratchKeyValuePair(KeyValuePair pair, uint32_t* flashPointer) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 176 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 177 | //we can only write using words |
| Jonathan Austin |
1:8aa5cdb4ab67 | 178 | uint32_t *p = (uint32_t *) &pair; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 179 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 180 | //calculate our various offsets |
| Jonathan Austin |
1:8aa5cdb4ab67 | 181 | uint32_t pg_size = NRF_FICR->CODEPAGESIZE; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 182 | uint32_t pg_num = NRF_FICR->CODESIZE - MICROBIT_STORAGE_STORE_PAGE_OFFSET; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 183 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 184 | uint32_t *scratchPointer = (uint32_t *)(pg_size * (NRF_FICR->CODESIZE - MICROBIT_STORAGE_SCRATCH_PAGE_OFFSET)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 185 | uint32_t *flashBlockPointer = (uint32_t *)(pg_size * pg_num); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 186 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 187 | uint32_t flashPointerOffset = flashPointer - flashBlockPointer; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 188 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 189 | scratchPointer += flashPointerOffset; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 190 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 191 | //KeyValuePair is word aligned... |
| Jonathan Austin |
1:8aa5cdb4ab67 | 192 | int wordsToWrite = sizeof(KeyValuePair) / 4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 193 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 194 | //write |
| Jonathan Austin |
1:8aa5cdb4ab67 | 195 | for (int i = 0; i < wordsToWrite; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 196 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 197 | flashWordWrite(scratchPointer, *p); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 198 | scratchPointer++; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 199 | p++; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 200 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 201 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 202 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 203 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 204 | * Places a given key, and it's corresponding value into flash at the earliest |
| Jonathan Austin |
1:8aa5cdb4ab67 | 205 | * available point. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 206 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 207 | * @param key the unique name that should be used as an identifier for the given data. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 208 | * The key is presumed to be null terminated. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 209 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 210 | * @param data a pointer to the beginning of the data to be persisted. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 211 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 212 | * @return MICROBIT_OK on success, or MICROBIT_NO_RESOURCES if the storage page is full |
| Jonathan Austin |
1:8aa5cdb4ab67 | 213 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 214 | int MicroBitStorage::put(const char *key, uint8_t *data) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 215 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 216 | KeyValuePair pair = KeyValuePair(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 217 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 218 | memcpy(pair.key, key, min(sizeof(pair.key), strlen(key))); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 219 | memcpy(pair.value, data, sizeof(pair.value)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 220 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 221 | //calculate our various offsets. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 222 | uint32_t pg_size = NRF_FICR->CODEPAGESIZE; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 223 | uint32_t *flashPointer = (uint32_t *)(pg_size * (NRF_FICR->CODESIZE - MICROBIT_STORAGE_STORE_PAGE_OFFSET)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 224 | uint32_t *flashBlockPointer = flashPointer; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 225 | uint32_t *scratchPointer = (uint32_t *)(pg_size * (NRF_FICR->CODESIZE - MICROBIT_STORAGE_SCRATCH_PAGE_OFFSET)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 226 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 227 | uint32_t kvStoreSize = sizeof(KeyValueStore) / 4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 228 | uint32_t kvPairSize = sizeof(KeyValuePair) / 4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 229 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 230 | int storeSize = size(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 231 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 232 | //our KeyValueStore struct is always at 0 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 233 | flashPointer += kvStoreSize; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 234 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 235 | KeyValuePair storedPair = KeyValuePair(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 236 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 237 | int found = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 238 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 239 | //erase our scratch page |
| Jonathan Austin |
1:8aa5cdb4ab67 | 240 | flashPageErase(scratchPointer); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 241 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 242 | //iterate through key value pairs in flash, writing them to the scratch page. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 243 | for(int i = 0; i < storeSize; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 244 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 245 | memcpy(&storedPair, flashPointer, sizeof(KeyValuePair)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 246 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 247 | //check if the keys match... |
| Jonathan Austin |
1:8aa5cdb4ab67 | 248 | if(strcmp((char *)storedPair.key, (char *)pair.key) == 0) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 249 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 250 | found = 1; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 251 | //scratch our KeyValueStore struct so that it is preserved. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 252 | scratchKeyValueStore(KeyValueStore(MICROBIT_STORAGE_MAGIC, storeSize)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 253 | scratchKeyValuePair(pair, flashPointer); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 254 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 255 | else |
| Jonathan Austin |
1:8aa5cdb4ab67 | 256 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 257 | scratchKeyValuePair(storedPair, flashPointer); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 258 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 259 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 260 | flashPointer += kvPairSize; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 261 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 262 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 263 | if(!found) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 264 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 265 | //if we haven't got a match for the key, check we can add a new KeyValuePair |
| Jonathan Austin |
1:8aa5cdb4ab67 | 266 | if(storeSize == (int)((pg_size - kvStoreSize) / MICROBIT_STORAGE_BLOCK_SIZE)) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 267 | return MICROBIT_NO_RESOURCES; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 268 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 269 | storeSize += 1; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 270 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 271 | //scratch our updated values. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 272 | scratchKeyValueStore(KeyValueStore(MICROBIT_STORAGE_MAGIC, storeSize)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 273 | scratchKeyValuePair(pair, flashPointer); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 274 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 275 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 276 | //erase our storage page |
| Jonathan Austin |
1:8aa5cdb4ab67 | 277 | flashPageErase((uint32_t *)flashBlockPointer); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 278 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 279 | //copy from scratch to storage. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 280 | flashCopy((uint32_t *)(pg_size * (NRF_FICR->CODESIZE - MICROBIT_STORAGE_SCRATCH_PAGE_OFFSET)), flashBlockPointer, kvStoreSize + (storeSize * kvPairSize)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 281 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 282 | return MICROBIT_OK; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 283 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 284 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 285 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 286 | * Places a given key, and it's corresponding value into flash at the earliest |
| Jonathan Austin |
1:8aa5cdb4ab67 | 287 | * available point. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 288 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 289 | * @param key the unique name that should be used as an identifier for the given data. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 290 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 291 | * @param data a pointer to the beginning of the data to be persisted. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 292 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 293 | * @return MICROBIT_OK on success, or MICROBIT_NO_RESOURCES if the storage page is full |
| Jonathan Austin |
1:8aa5cdb4ab67 | 294 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 295 | int MicroBitStorage::put(ManagedString key, uint8_t* data) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 296 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 297 | return put((char *)key.toCharArray(), data); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 298 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 299 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 300 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 301 | * Retreives a KeyValuePair identified by a given key. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 302 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 303 | * @param key the unique name used to identify a KeyValuePair in flash. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 304 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 305 | * @return a pointer to a heap allocated KeyValuePair struct, this pointer will be |
| Jonathan Austin |
1:8aa5cdb4ab67 | 306 | * NULL if the key was not found in storage. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 307 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 308 | * @note it is up to the user to free memory after use. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 309 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 310 | KeyValuePair* MicroBitStorage::get(const char* key) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 311 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 312 | //calculate our offsets for our storage page |
| Jonathan Austin |
1:8aa5cdb4ab67 | 313 | uint32_t pg_size = NRF_FICR->CODEPAGESIZE; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 314 | uint32_t pg_num = NRF_FICR->CODESIZE - MICROBIT_STORAGE_STORE_PAGE_OFFSET; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 315 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 316 | uint32_t *flashBlockPointer = (uint32_t *)(pg_size * pg_num); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 317 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 318 | int storeSize = size(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 319 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 320 | //we haven't got anything stored, so return... |
| Jonathan Austin |
1:8aa5cdb4ab67 | 321 | if(storeSize == 0) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 322 | return NULL; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 323 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 324 | //our KeyValueStore struct is always at 0 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 325 | flashBlockPointer += sizeof(KeyValueStore) / 4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 326 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 327 | KeyValuePair *pair = new KeyValuePair(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 328 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 329 | int i; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 330 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 331 | //iterate through flash until we have a match, or drop out. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 332 | for(i = 0; i < storeSize; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 333 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 334 | memcpy(pair, flashBlockPointer, sizeof(KeyValuePair)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 335 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 336 | if(strcmp(key,(char *)pair->key) == 0) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 337 | break; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 338 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 339 | flashBlockPointer += sizeof(KeyValuePair) / 4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 340 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 341 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 342 | //clean up |
| Jonathan Austin |
1:8aa5cdb4ab67 | 343 | if(i == storeSize) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 344 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 345 | delete pair; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 346 | return NULL; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 347 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 348 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 349 | return pair; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 350 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 351 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 352 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 353 | * Retreives a KeyValuePair identified by a given key. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 354 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 355 | * @param key the unique name used to identify a KeyValuePair in flash. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 356 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 357 | * @return a pointer to a heap allocated KeyValuePair struct, this pointer will be |
| Jonathan Austin |
1:8aa5cdb4ab67 | 358 | * NULL if the key was not found in storage. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 359 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 360 | * @note it is up to the user to free memory after use. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 361 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 362 | KeyValuePair* MicroBitStorage::get(ManagedString key) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 363 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 364 | return get((char *)key.toCharArray()); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 365 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 366 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 367 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 368 | * Removes a KeyValuePair identified by a given key. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 369 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 370 | * @param key the unique name used to identify a KeyValuePair in flash. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 371 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 372 | * @return MICROBIT_OK on success, or MICROBIT_NO_DATA if the given key |
| Jonathan Austin |
1:8aa5cdb4ab67 | 373 | * was not found in flash. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 374 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 375 | int MicroBitStorage::remove(const char* key) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 376 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 377 | //calculate our various offsets |
| Jonathan Austin |
1:8aa5cdb4ab67 | 378 | uint32_t pg_size = NRF_FICR->CODEPAGESIZE; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 379 | uint32_t *flashPointer = (uint32_t *)(pg_size * (NRF_FICR->CODESIZE - MICROBIT_STORAGE_STORE_PAGE_OFFSET)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 380 | uint32_t *flashBlockPointer = flashPointer; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 381 | uint32_t *scratchPointer = (uint32_t *)(pg_size * (NRF_FICR->CODESIZE - MICROBIT_STORAGE_SCRATCH_PAGE_OFFSET)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 382 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 383 | uint32_t kvStoreSize = sizeof(KeyValueStore) / 4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 384 | uint32_t kvPairSize = sizeof(KeyValuePair) / 4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 385 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 386 | int storeSize = size(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 387 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 388 | //if we have no data, we have nothing to do. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 389 | if(storeSize == 0) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 390 | return MICROBIT_NO_DATA; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 391 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 392 | //our KeyValueStore struct is always at 0 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 393 | flashPointer += kvStoreSize; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 394 | scratchPointer += kvStoreSize; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 395 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 396 | KeyValuePair storedPair = KeyValuePair(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 397 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 398 | int found = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 399 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 400 | //set up our scratch area |
| Jonathan Austin |
1:8aa5cdb4ab67 | 401 | flashPageErase(scratchPointer); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 402 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 403 | //iterate through our flash copy pairs to scratch, unless there is a key patch |
| Jonathan Austin |
1:8aa5cdb4ab67 | 404 | for(int i = 0; i < storeSize; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 405 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 406 | memcpy(&storedPair, flashPointer, sizeof(KeyValuePair)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 407 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 408 | //if we have a match, don't increment our scratchPointer |
| Jonathan Austin |
1:8aa5cdb4ab67 | 409 | if(strcmp((char *)storedPair.key, (char *)key) == 0) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 410 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 411 | found = 1; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 412 | //write our new KeyValueStore data |
| Jonathan Austin |
1:8aa5cdb4ab67 | 413 | scratchKeyValueStore(KeyValueStore(MICROBIT_STORAGE_MAGIC, storeSize - 1)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 414 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 415 | else |
| Jonathan Austin |
1:8aa5cdb4ab67 | 416 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 417 | //otherwise copy the KeyValuePair from our storage page. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 418 | flashCopy(flashPointer, scratchPointer, sizeof(KeyValuePair) / 4); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 419 | scratchPointer += sizeof(KeyValuePair) / 4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 420 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 421 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 422 | flashPointer += sizeof(KeyValuePair) / 4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 423 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 424 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 425 | //if we haven't got a match, write our old KeyValueStore struct |
| Jonathan Austin |
1:8aa5cdb4ab67 | 426 | if(!found) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 427 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 428 | scratchKeyValueStore(KeyValueStore(MICROBIT_STORAGE_MAGIC, storeSize)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 429 | return MICROBIT_NO_DATA; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 430 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 431 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 432 | //copy scratch to our storage page |
| Jonathan Austin |
1:8aa5cdb4ab67 | 433 | flashPageErase((uint32_t *)flashBlockPointer); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 434 | flashCopy((uint32_t *)(pg_size * (NRF_FICR->CODESIZE - MICROBIT_STORAGE_SCRATCH_PAGE_OFFSET)), flashBlockPointer, kvStoreSize + (storeSize * kvPairSize)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 435 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 436 | return MICROBIT_OK; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 437 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 438 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 439 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 440 | * Removes a KeyValuePair identified by a given key. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 441 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 442 | * @param key the unique name used to identify a KeyValuePair in flash. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 443 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 444 | * @return MICROBIT_OK on success, or MICROBIT_NO_DATA if the given key |
| Jonathan Austin |
1:8aa5cdb4ab67 | 445 | * was not found in flash. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 446 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 447 | int MicroBitStorage::remove(ManagedString key) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 448 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 449 | return remove((char *)key.toCharArray()); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 450 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 451 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 452 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 453 | * The size of the flash based KeyValueStore. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 454 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 455 | * @return the number of entries in the key value store |
| Jonathan Austin |
1:8aa5cdb4ab67 | 456 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 457 | int MicroBitStorage::size() |
| Jonathan Austin |
1:8aa5cdb4ab67 | 458 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 459 | uint32_t pg_size = NRF_FICR->CODEPAGESIZE; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 460 | uint32_t pg_num = NRF_FICR->CODESIZE - MICROBIT_STORAGE_STORE_PAGE_OFFSET; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 461 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 462 | uint32_t *flashBlockPointer = (uint32_t *)(pg_size * pg_num); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 463 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 464 | KeyValueStore store = KeyValueStore(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 465 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 466 | //read our data! |
| Jonathan Austin |
1:8aa5cdb4ab67 | 467 | memcpy(&store, flashBlockPointer, sizeof(KeyValueStore)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 468 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 469 | //if we haven't used flash before, we need to configure it |
| Jonathan Austin |
1:8aa5cdb4ab67 | 470 | if(store.magic != MICROBIT_STORAGE_MAGIC) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 471 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 472 | store.magic = MICROBIT_STORAGE_MAGIC; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 473 | store.size = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 474 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 475 | //erase the scratch page and write our new KeyValueStore |
| Jonathan Austin |
1:8aa5cdb4ab67 | 476 | flashPageErase((uint32_t *)(pg_size * (NRF_FICR->CODESIZE - MICROBIT_STORAGE_SCRATCH_PAGE_OFFSET))); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 477 | scratchKeyValueStore(store); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 478 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 479 | //erase flash, and copy the scratch page over |
| Jonathan Austin |
1:8aa5cdb4ab67 | 480 | flashPageErase((uint32_t *)flashBlockPointer); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 481 | flashCopy((uint32_t *)(pg_size * (NRF_FICR->CODESIZE - MICROBIT_STORAGE_SCRATCH_PAGE_OFFSET)), flashBlockPointer, pg_size/4); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 482 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 483 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 484 | return store.size; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 485 | } |