1085500e89
* Rework paths for eeprom locations. * File relocation. * Wrong file move. * Fixup test paths.
630 lines
22 KiB
C
630 lines
22 KiB
C
/*
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* This software is experimental and a work in progress.
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* Under no circumstances should these files be used in relation to any critical system(s).
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* Use of these files is at your own risk.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* This files are free to use from http://engsta.com/stm32-flash-memory-eeprom-emulator/ by
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* Artur F.
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*
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* Modifications for QMK and STM32F303 by Yiancar
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* Modifications to add flash wear leveling by Ilya Zhuravlev
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* Modifications to increase flash density by Don Kjer
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*/
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#include <stdio.h>
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#include <stdbool.h>
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#include "util.h"
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#include "debug.h"
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#include "eeprom_stm32.h"
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#include "flash_stm32.h"
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/*
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* We emulate eeprom by writing a snapshot compacted view of eeprom contents,
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* followed by a write log of any change since that snapshot:
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*
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* === SIMULATED EEPROM CONTENTS ===
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*
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* ┌─ Compacted ┬ Write Log ─┐
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* │............│[BYTE][BYTE]│
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* │FFFF....FFFF│[WRD0][WRD1]│
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* │FFFFFFFFFFFF│[WORD][NEXT]│
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* │....FFFFFFFF│[BYTE][WRD0]│
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* ├────────────┼────────────┤
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* └──PAGE_BASE │ │
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* PAGE_LAST─┴─WRITE_BASE │
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* WRITE_LAST ┘
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*
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* Compacted contents are the 1's complement of the actual EEPROM contents.
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* e.g. An 'FFFF' represents a '0000' value.
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*
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* The size of the 'compacted' area is equal to the size of the 'emulated' eeprom.
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* The size of the compacted-area and write log are configurable, and the combined
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* size of Compacted + WriteLog is a multiple FEE_PAGE_SIZE, which is MCU dependent.
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* Simulated Eeprom contents are located at the end of available flash space.
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*
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* The following configuration defines can be set:
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*
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* FEE_PAGE_COUNT # Total number of pages to use for eeprom simulation (Compact + Write log)
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* FEE_DENSITY_BYTES # Size of simulated eeprom. (Defaults to half the space allocated by FEE_PAGE_COUNT)
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* NOTE: The current implementation does not include page swapping,
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* and FEE_DENSITY_BYTES will consume that amount of RAM as a cached view of actual EEPROM contents.
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*
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* The maximum size of FEE_DENSITY_BYTES is currently 16384. The write log size equals
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* FEE_PAGE_COUNT * FEE_PAGE_SIZE - FEE_DENSITY_BYTES.
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* The larger the write log, the less frequently the compacted area needs to be rewritten.
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*
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*
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* *** General Algorithm ***
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*
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* During initialization:
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* The contents of the Compacted-flash area are loaded and the 1's complement value
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* is cached into memory (e.g. 0xFFFF in Flash represents 0x0000 in cache).
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* Write log entries are processed until a 0xFFFF is reached.
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* Each log entry updates a byte or word in the cache.
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*
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* During reads:
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* EEPROM contents are given back directly from the cache in memory.
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*
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* During writes:
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* The contents of the cache is updated first.
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* If the Compacted-flash area corresponding to the write address is unprogrammed, the 1's complement of the value is written directly into Compacted-flash
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* Otherwise:
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* If the write log is full, erase both the Compacted-flash area and the Write log, then write cached contents to the Compacted-flash area.
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* Otherwise a Write log entry is constructed and appended to the next free position in the Write log.
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*
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*
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* *** Write Log Structure ***
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*
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* Write log entries allow for optimized byte writes to addresses below 128. Writing 0 or 1 words are also optimized when word-aligned.
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*
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* === WRITE LOG ENTRY FORMATS ===
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*
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* ╔═══ Byte-Entry ══╗
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* ║0XXXXXXX║YYYYYYYY║
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* ║ └──┬──┘║└──┬───┘║
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* ║ Address║ Value ║
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* ╚════════╩════════╝
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* 0 <= Address < 0x80 (128)
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*
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* ╔ Word-Encoded 0 ╗
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* ║100XXXXXXXXXXXXX║
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* ║ │└─────┬─────┘║
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* ║ │Address >> 1 ║
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* ║ └── Value: 0 ║
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* ╚════════════════╝
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* 0 <= Address <= 0x3FFE (16382)
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*
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* ╔ Word-Encoded 1 ╗
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* ║101XXXXXXXXXXXXX║
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* ║ │└─────┬─────┘║
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* ║ │Address >> 1 ║
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* ║ └── Value: 1 ║
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* ╚════════════════╝
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* 0 <= Address <= 0x3FFE (16382)
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*
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* ╔═══ Reserved ═══╗
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* ║110XXXXXXXXXXXXX║
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* ╚════════════════╝
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*
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* ╔═══════════ Word-Next ═══════════╗
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* ║111XXXXXXXXXXXXX║YYYYYYYYYYYYYYYY║
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* ║ └─────┬─────┘║└───────┬──────┘║
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* ║(Address-128)>>1║ ~Value ║
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* ╚════════════════╩════════════════╝
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* ( 0 <= Address < 0x0080 (128): Reserved)
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* 0x80 <= Address <= 0x3FFE (16382)
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*
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* Write Log entry ranges:
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* 0x0000 ... 0x7FFF - Byte-Entry; address is (Entry & 0x7F00) >> 4; value is (Entry & 0xFF)
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* 0x8000 ... 0x9FFF - Word-Encoded 0; address is (Entry & 0x1FFF) << 1; value is 0
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* 0xA000 ... 0xBFFF - Word-Encoded 1; address is (Entry & 0x1FFF) << 1; value is 1
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* 0xC000 ... 0xDFFF - Reserved
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* 0xE000 ... 0xFFBF - Word-Next; address is (Entry & 0x1FFF) << 1 + 0x80; value is ~(Next_Entry)
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* 0xFFC0 ... 0xFFFE - Reserved
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* 0xFFFF - Unprogrammed
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*
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*/
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#include "eeprom_stm32_defs.h"
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/* These bits are used for optimizing encoding of bytes, 0 and 1 */
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#define FEE_WORD_ENCODING 0x8000
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#define FEE_VALUE_NEXT 0x6000
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#define FEE_VALUE_RESERVED 0x4000
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#define FEE_VALUE_ENCODED 0x2000
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#define FEE_BYTE_RANGE 0x80
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/* Flash word value after erase */
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#define FEE_EMPTY_WORD ((uint16_t)0xFFFF)
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#if !defined(FEE_PAGE_SIZE) || !defined(FEE_PAGE_COUNT) || !defined(FEE_MCU_FLASH_SIZE) || !defined(FEE_PAGE_BASE_ADDRESS)
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# error "not implemented."
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#endif
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/* In-memory contents of emulated eeprom for faster access */
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/* *TODO: Implement page swapping */
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static uint16_t WordBuf[FEE_DENSITY_BYTES / 2];
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static uint8_t *DataBuf = (uint8_t *)WordBuf;
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/* Pointer to the first available slot within the write log */
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static uint16_t *empty_slot;
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// #define DEBUG_EEPROM_OUTPUT
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/*
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* Debug print utils
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*/
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#if defined(DEBUG_EEPROM_OUTPUT)
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# define debug_eeprom debug_enable
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# define eeprom_println(s) println(s)
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# define eeprom_printf(fmt, ...) xprintf(fmt, ##__VA_ARGS__);
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#else /* NO_DEBUG */
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# define debug_eeprom false
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# define eeprom_println(s)
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# define eeprom_printf(fmt, ...)
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#endif /* NO_DEBUG */
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void print_eeprom(void) {
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#ifndef NO_DEBUG
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int empty_rows = 0;
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for (uint16_t i = 0; i < FEE_DENSITY_BYTES; i++) {
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if (i % 16 == 0) {
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if (i >= FEE_DENSITY_BYTES - 16) {
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/* Make sure we display the last row */
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empty_rows = 0;
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}
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/* Check if this row is uninitialized */
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++empty_rows;
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for (uint16_t j = 0; j < 16; j++) {
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if (DataBuf[i + j]) {
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empty_rows = 0;
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break;
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}
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}
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if (empty_rows > 1) {
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/* Repeat empty row */
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if (empty_rows == 2) {
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/* Only display the first repeat empty row */
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println("*");
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}
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i += 15;
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continue;
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}
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xprintf("%04x", i);
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}
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if (i % 8 == 0) print(" ");
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xprintf(" %02x", DataBuf[i]);
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if ((i + 1) % 16 == 0) {
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println("");
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}
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}
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#endif
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}
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uint16_t EEPROM_Init(void) {
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/* Load emulated eeprom contents from compacted flash into memory */
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uint16_t *src = (uint16_t *)FEE_COMPACTED_BASE_ADDRESS;
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uint16_t *dest = (uint16_t *)DataBuf;
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for (; src < (uint16_t *)FEE_COMPACTED_LAST_ADDRESS; ++src, ++dest) {
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*dest = ~*src;
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}
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if (debug_eeprom) {
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println("EEPROM_Init Compacted Pages:");
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print_eeprom();
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println("EEPROM_Init Write Log:");
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}
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/* Replay write log */
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uint16_t *log_addr;
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for (log_addr = (uint16_t *)FEE_WRITE_LOG_BASE_ADDRESS; log_addr < (uint16_t *)FEE_WRITE_LOG_LAST_ADDRESS; ++log_addr) {
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uint16_t address = *log_addr;
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if (address == FEE_EMPTY_WORD) {
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break;
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}
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/* Check for lowest 128-bytes optimization */
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if (!(address & FEE_WORD_ENCODING)) {
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uint8_t bvalue = (uint8_t)address;
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address >>= 8;
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DataBuf[address] = bvalue;
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eeprom_printf("DataBuf[0x%02x] = 0x%02x;\n", address, bvalue);
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} else {
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uint16_t wvalue;
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/* Check if value is in next word */
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if ((address & FEE_VALUE_NEXT) == FEE_VALUE_NEXT) {
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/* Read value from next word */
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if (++log_addr >= (uint16_t *)FEE_WRITE_LOG_LAST_ADDRESS) {
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break;
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}
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wvalue = ~*log_addr;
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if (!wvalue) {
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eeprom_printf("Incomplete write at log_addr: 0x%04x;\n", (uint32_t)log_addr);
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/* Possibly incomplete write. Ignore and continue */
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continue;
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}
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address &= 0x1FFF;
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address <<= 1;
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/* Writes to addresses less than 128 are byte log entries */
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address += FEE_BYTE_RANGE;
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} else {
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/* Reserved for future use */
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if (address & FEE_VALUE_RESERVED) {
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eeprom_printf("Reserved encoded value at log_addr: 0x%04x;\n", (uint32_t)log_addr);
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continue;
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}
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/* Optimization for 0 or 1 values. */
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wvalue = (address & FEE_VALUE_ENCODED) >> 13;
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address &= 0x1FFF;
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address <<= 1;
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}
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if (address < FEE_DENSITY_BYTES) {
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eeprom_printf("DataBuf[0x%04x] = 0x%04x;\n", address, wvalue);
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*(uint16_t *)(&DataBuf[address]) = wvalue;
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} else {
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eeprom_printf("DataBuf[0x%04x] cannot be set to 0x%04x [BAD ADDRESS]\n", address, wvalue);
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}
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}
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}
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empty_slot = log_addr;
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if (debug_eeprom) {
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println("EEPROM_Init Final DataBuf:");
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print_eeprom();
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}
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return FEE_DENSITY_BYTES;
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}
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/* Clear flash contents (doesn't touch in-memory DataBuf) */
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static void eeprom_clear(void) {
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FLASH_Unlock();
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for (uint16_t page_num = 0; page_num < FEE_PAGE_COUNT; ++page_num) {
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eeprom_printf("FLASH_ErasePage(0x%04x)\n", (uint32_t)(FEE_PAGE_BASE_ADDRESS + (page_num * FEE_PAGE_SIZE)));
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FLASH_ErasePage(FEE_PAGE_BASE_ADDRESS + (page_num * FEE_PAGE_SIZE));
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}
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FLASH_Lock();
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empty_slot = (uint16_t *)FEE_WRITE_LOG_BASE_ADDRESS;
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eeprom_printf("eeprom_clear empty_slot: 0x%08x\n", (uint32_t)empty_slot);
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}
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/* Erase emulated eeprom */
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void EEPROM_Erase(void) {
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eeprom_println("EEPROM_Erase");
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/* Erase compacted pages and write log */
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eeprom_clear();
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/* re-initialize to reset DataBuf */
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EEPROM_Init();
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}
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/* Compact write log */
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static uint8_t eeprom_compact(void) {
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/* Erase compacted pages and write log */
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eeprom_clear();
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FLASH_Unlock();
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FLASH_Status final_status = FLASH_COMPLETE;
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/* Write emulated eeprom contents from memory to compacted flash */
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uint16_t *src = (uint16_t *)DataBuf;
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uintptr_t dest = FEE_COMPACTED_BASE_ADDRESS;
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uint16_t value;
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for (; dest < FEE_COMPACTED_LAST_ADDRESS; ++src, dest += 2) {
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value = *src;
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if (value) {
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eeprom_printf("FLASH_ProgramHalfWord(0x%04x, 0x%04x)\n", (uint32_t)dest, ~value);
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FLASH_Status status = FLASH_ProgramHalfWord(dest, ~value);
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if (status != FLASH_COMPLETE) final_status = status;
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}
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}
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FLASH_Lock();
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if (debug_eeprom) {
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println("eeprom_compacted:");
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print_eeprom();
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}
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return final_status;
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}
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static uint8_t eeprom_write_direct_entry(uint16_t Address) {
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/* Check if we can just write this directly to the compacted flash area */
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uintptr_t directAddress = FEE_COMPACTED_BASE_ADDRESS + (Address & 0xFFFE);
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if (*(uint16_t *)directAddress == FEE_EMPTY_WORD) {
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/* Write the value directly to the compacted area without a log entry */
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uint16_t value = ~*(uint16_t *)(&DataBuf[Address & 0xFFFE]);
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/* Early exit if a write isn't needed */
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if (value == FEE_EMPTY_WORD) return FLASH_COMPLETE;
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FLASH_Unlock();
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eeprom_printf("FLASH_ProgramHalfWord(0x%08x, 0x%04x) [DIRECT]\n", (uint32_t)directAddress, value);
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FLASH_Status status = FLASH_ProgramHalfWord(directAddress, value);
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FLASH_Lock();
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return status;
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}
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return 0;
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}
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static uint8_t eeprom_write_log_word_entry(uint16_t Address) {
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FLASH_Status final_status = FLASH_COMPLETE;
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uint16_t value = *(uint16_t *)(&DataBuf[Address]);
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eeprom_printf("eeprom_write_log_word_entry(0x%04x): 0x%04x\n", Address, value);
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/* MSB signifies the lowest 128-byte optimization is not in effect */
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uint16_t encoding = FEE_WORD_ENCODING;
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uint8_t entry_size;
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if (value <= 1) {
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encoding |= value << 13;
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entry_size = 2;
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} else {
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encoding |= FEE_VALUE_NEXT;
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entry_size = 4;
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/* Writes to addresses less than 128 are byte log entries */
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Address -= FEE_BYTE_RANGE;
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}
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/* if we can't find an empty spot, we must compact emulated eeprom */
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if (empty_slot > (uint16_t *)(FEE_WRITE_LOG_LAST_ADDRESS - entry_size)) {
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/* compact the write log into the compacted flash area */
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return eeprom_compact();
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}
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/* Word log writes should be word-aligned. Take back a bit */
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Address >>= 1;
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Address |= encoding;
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/* ok we found a place let's write our data */
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FLASH_Unlock();
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/* address */
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eeprom_printf("FLASH_ProgramHalfWord(0x%08x, 0x%04x)\n", (uint32_t)empty_slot, Address);
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final_status = FLASH_ProgramHalfWord((uintptr_t)empty_slot++, Address);
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/* value */
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if (encoding == (FEE_WORD_ENCODING | FEE_VALUE_NEXT)) {
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eeprom_printf("FLASH_ProgramHalfWord(0x%08x, 0x%04x)\n", (uint32_t)empty_slot, ~value);
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FLASH_Status status = FLASH_ProgramHalfWord((uintptr_t)empty_slot++, ~value);
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if (status != FLASH_COMPLETE) final_status = status;
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}
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FLASH_Lock();
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return final_status;
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}
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static uint8_t eeprom_write_log_byte_entry(uint16_t Address) {
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eeprom_printf("eeprom_write_log_byte_entry(0x%04x): 0x%02x\n", Address, DataBuf[Address]);
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/* if couldn't find an empty spot, we must compact emulated eeprom */
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if (empty_slot >= (uint16_t *)FEE_WRITE_LOG_LAST_ADDRESS) {
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/* compact the write log into the compacted flash area */
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return eeprom_compact();
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}
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/* ok we found a place let's write our data */
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FLASH_Unlock();
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/* Pack address and value into the same word */
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uint16_t value = (Address << 8) | DataBuf[Address];
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/* write to flash */
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eeprom_printf("FLASH_ProgramHalfWord(0x%08x, 0x%04x)\n", (uint32_t)empty_slot, value);
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FLASH_Status status = FLASH_ProgramHalfWord((uintptr_t)empty_slot++, value);
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FLASH_Lock();
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return status;
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}
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uint8_t EEPROM_WriteDataByte(uint16_t Address, uint8_t DataByte) {
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/* if the address is out-of-bounds, do nothing */
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if (Address >= FEE_DENSITY_BYTES) {
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eeprom_printf("EEPROM_WriteDataByte(0x%04x, 0x%02x) [BAD ADDRESS]\n", Address, DataByte);
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return FLASH_BAD_ADDRESS;
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}
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/* if the value is the same, don't bother writing it */
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if (DataBuf[Address] == DataByte) {
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eeprom_printf("EEPROM_WriteDataByte(0x%04x, 0x%02x) [SKIP SAME]\n", Address, DataByte);
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return 0;
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}
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/* keep DataBuf cache in sync */
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DataBuf[Address] = DataByte;
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eeprom_printf("EEPROM_WriteDataByte DataBuf[0x%04x] = 0x%02x\n", Address, DataBuf[Address]);
|
|
|
|
/* perform the write into flash memory */
|
|
/* First, attempt to write directly into the compacted flash area */
|
|
FLASH_Status status = eeprom_write_direct_entry(Address);
|
|
if (!status) {
|
|
/* Otherwise append to the write log */
|
|
if (Address < FEE_BYTE_RANGE) {
|
|
status = eeprom_write_log_byte_entry(Address);
|
|
} else {
|
|
status = eeprom_write_log_word_entry(Address & 0xFFFE);
|
|
}
|
|
}
|
|
if (status != 0 && status != FLASH_COMPLETE) {
|
|
eeprom_printf("EEPROM_WriteDataByte [STATUS == %d]\n", status);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
uint8_t EEPROM_WriteDataWord(uint16_t Address, uint16_t DataWord) {
|
|
/* if the address is out-of-bounds, do nothing */
|
|
if (Address >= FEE_DENSITY_BYTES) {
|
|
eeprom_printf("EEPROM_WriteDataWord(0x%04x, 0x%04x) [BAD ADDRESS]\n", Address, DataWord);
|
|
return FLASH_BAD_ADDRESS;
|
|
}
|
|
|
|
/* Check for word alignment */
|
|
FLASH_Status final_status = FLASH_COMPLETE;
|
|
if (Address % 2) {
|
|
final_status = EEPROM_WriteDataByte(Address, DataWord);
|
|
FLASH_Status status = EEPROM_WriteDataByte(Address + 1, DataWord >> 8);
|
|
if (status != FLASH_COMPLETE) final_status = status;
|
|
if (final_status != 0 && final_status != FLASH_COMPLETE) {
|
|
eeprom_printf("EEPROM_WriteDataWord [STATUS == %d]\n", final_status);
|
|
}
|
|
return final_status;
|
|
}
|
|
|
|
/* if the value is the same, don't bother writing it */
|
|
uint16_t oldValue = *(uint16_t *)(&DataBuf[Address]);
|
|
if (oldValue == DataWord) {
|
|
eeprom_printf("EEPROM_WriteDataWord(0x%04x, 0x%04x) [SKIP SAME]\n", Address, DataWord);
|
|
return 0;
|
|
}
|
|
|
|
/* keep DataBuf cache in sync */
|
|
*(uint16_t *)(&DataBuf[Address]) = DataWord;
|
|
eeprom_printf("EEPROM_WriteDataWord DataBuf[0x%04x] = 0x%04x\n", Address, *(uint16_t *)(&DataBuf[Address]));
|
|
|
|
/* perform the write into flash memory */
|
|
/* First, attempt to write directly into the compacted flash area */
|
|
final_status = eeprom_write_direct_entry(Address);
|
|
if (!final_status) {
|
|
/* Otherwise append to the write log */
|
|
/* Check if we need to fall back to byte write */
|
|
if (Address < FEE_BYTE_RANGE) {
|
|
final_status = FLASH_COMPLETE;
|
|
/* Only write a byte if it has changed */
|
|
if ((uint8_t)oldValue != (uint8_t)DataWord) {
|
|
final_status = eeprom_write_log_byte_entry(Address);
|
|
}
|
|
FLASH_Status status = FLASH_COMPLETE;
|
|
/* Only write a byte if it has changed */
|
|
if ((oldValue >> 8) != (DataWord >> 8)) {
|
|
status = eeprom_write_log_byte_entry(Address + 1);
|
|
}
|
|
if (status != FLASH_COMPLETE) final_status = status;
|
|
} else {
|
|
final_status = eeprom_write_log_word_entry(Address);
|
|
}
|
|
}
|
|
if (final_status != 0 && final_status != FLASH_COMPLETE) {
|
|
eeprom_printf("EEPROM_WriteDataWord [STATUS == %d]\n", final_status);
|
|
}
|
|
return final_status;
|
|
}
|
|
|
|
uint8_t EEPROM_ReadDataByte(uint16_t Address) {
|
|
uint8_t DataByte = 0xFF;
|
|
|
|
if (Address < FEE_DENSITY_BYTES) {
|
|
DataByte = DataBuf[Address];
|
|
}
|
|
|
|
eeprom_printf("EEPROM_ReadDataByte(0x%04x): 0x%02x\n", Address, DataByte);
|
|
|
|
return DataByte;
|
|
}
|
|
|
|
uint16_t EEPROM_ReadDataWord(uint16_t Address) {
|
|
uint16_t DataWord = 0xFFFF;
|
|
|
|
if (Address < FEE_DENSITY_BYTES - 1) {
|
|
/* Check word alignment */
|
|
if (Address % 2) {
|
|
DataWord = DataBuf[Address] | (DataBuf[Address + 1] << 8);
|
|
} else {
|
|
DataWord = *(uint16_t *)(&DataBuf[Address]);
|
|
}
|
|
}
|
|
|
|
eeprom_printf("EEPROM_ReadDataWord(0x%04x): 0x%04x\n", Address, DataWord);
|
|
|
|
return DataWord;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Bind to eeprom_driver.c
|
|
*******************************************************************************/
|
|
void eeprom_driver_init(void) {
|
|
EEPROM_Init();
|
|
}
|
|
|
|
void eeprom_driver_erase(void) {
|
|
EEPROM_Erase();
|
|
}
|
|
|
|
void eeprom_read_block(void *buf, const void *addr, size_t len) {
|
|
const uint8_t *src = (const uint8_t *)addr;
|
|
uint8_t * dest = (uint8_t *)buf;
|
|
|
|
/* Check word alignment */
|
|
if (len && (uintptr_t)src % 2) {
|
|
/* Read the unaligned first byte */
|
|
*dest++ = EEPROM_ReadDataByte((const uintptr_t)src++);
|
|
--len;
|
|
}
|
|
|
|
uint16_t value;
|
|
bool aligned = ((uintptr_t)dest % 2 == 0);
|
|
while (len > 1) {
|
|
value = EEPROM_ReadDataWord((const uintptr_t)((uint16_t *)src));
|
|
if (aligned) {
|
|
*(uint16_t *)dest = value;
|
|
dest += 2;
|
|
} else {
|
|
*dest++ = value;
|
|
*dest++ = value >> 8;
|
|
}
|
|
src += 2;
|
|
len -= 2;
|
|
}
|
|
if (len) {
|
|
*dest = EEPROM_ReadDataByte((const uintptr_t)src);
|
|
}
|
|
}
|
|
|
|
void eeprom_write_block(const void *buf, void *addr, size_t len) {
|
|
uint8_t * dest = (uint8_t *)addr;
|
|
const uint8_t *src = (const uint8_t *)buf;
|
|
|
|
/* Check word alignment */
|
|
if (len && (uintptr_t)dest % 2) {
|
|
/* Write the unaligned first byte */
|
|
EEPROM_WriteDataByte((uintptr_t)dest++, *src++);
|
|
--len;
|
|
}
|
|
|
|
uint16_t value;
|
|
bool aligned = ((uintptr_t)src % 2 == 0);
|
|
while (len > 1) {
|
|
if (aligned) {
|
|
value = *(uint16_t *)src;
|
|
} else {
|
|
value = *(uint8_t *)src | (*(uint8_t *)(src + 1) << 8);
|
|
}
|
|
EEPROM_WriteDataWord((uintptr_t)((uint16_t *)dest), value);
|
|
dest += 2;
|
|
src += 2;
|
|
len -= 2;
|
|
}
|
|
|
|
if (len) {
|
|
EEPROM_WriteDataByte((uintptr_t)dest, *src);
|
|
}
|
|
}
|