diff --git a/lib/flash_internal.c b/lib/flash_internal.c
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+++ b/lib/flash_internal.c
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+/* 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 .
+ *
+ */
+/** library to read/write internal flash (code)
+ * @file flash_internal.c
+ * @author King Kévin
+ * @date 2016
+ * @note 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_internal.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
+
+bool flash_internal_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; iSTORAGE_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.
+ *
+ */
+/** library to read/write internal flash (API)
+ * @file flash_internal.h
+ * @author King Kévin
+ * @date 2016
+ * @note peripherals used: none
+ */
+#pragma once
+
+#include // device signature utilities
+
+/** how much data (in bytes) should we be able to store (be sure it's available and does not overlap the firmware) */
+#define STORAGE_SIZE 2048
+/** the end of the flash area where to store data */
+#define STORAGE_END FLASH_BASE+DESIG_FLASH_SIZE
+/** the start of the flash area where to store data (be sure it's after the firmware data) */
+#define STORAGE_START STORAGE_END-STORAGE_SIZE
+
+/** read data from internal flash
+ * @param[in] address start address of the data to read
+ * @param[out] buffer where to store the read data
+ * @param[in] size how much data to read, in bytes
+ * @return if read succeeded
+ */
+bool flash_internal_read(uint32_t address, uint8_t *buffer, size_t size);
+/** write data to internal flash
+ * @param[in] address start address where to write data to
+ * @param[in] buffer data to be written
+ * @param[in] size how much data to write, in bytes
+ * @return if write succeeded
+ */
+bool flash_internal_write(uint32_t address, uint8_t *buffer, size_t size);