/* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*
*/
/* Copyright (c) 2016 King Kévin */
/* this library is used to store (read and write) data in flash */
/* peripherals used: none */
/* standard libraries */
#include // standard integer types
#include // general utilities
/* STM32 (including CM3) libraries */
#include // device signature utilities
#include // flash utilities
#include "flash_storage.h" // flash storage library API
#include "global.h" // global definitions
// the flash page size (medium-density devices have 1KiB page size)
#define PAGE_SIZE 1024
/* read data from address into
* returns if read succeeded */
bool storage_read(uint32_t address, uint8_t *buffer, size_t size)
{
// verify it's in the storage area
if (addressSTORAGE_END) {
return false;
}
if (buffer==NULL || size==0) {
return false;
}
// copy data byte per byte
// a more efficient way would be to copy words, than the remaining bytes
for (size_t i=0; i data from to address
* returns if write succeeded */
bool storage_write(uint32_t address, uint8_t *buffer, size_t size)
{
// verify it's in the storage area
if (addressSTORAGE_END) {
return false;
}
if (buffer==NULL || size==0) {
return false;
}
uint8_t page[PAGE_SIZE]; // the complete page to write
flash_unlock(); // unlock flash to be able to write it
// go through memory
while (size) {
uint32_t page_pre = address%PAGE_SIZE; // the beginning data size in the page
address -= page_pre; // go to beginning of the page
storage_read(address, &page[0], page_pre); // copy existing data
if (size>=PAGE_SIZE-page_pre) { // no need to read tailing page data
for (uint16_t i=0; i