lib/flash_internal: re-add used library
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** library to read/write internal flash (code)
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* @file flash_internal.c
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2016
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* @note peripherals used: none
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*/
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/* standard libraries */
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#include <stdint.h> // standard integer types
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#include <stdlib.h> // general utilities
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/* STM32 (including CM3) libraries */
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#include <libopencm3/stm32/desig.h> // device signature utilities
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#include <libopencm3/stm32/flash.h> // flash utilities
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#include "flash_internal.h" // flash storage library API
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#include "global.h" // global definitions
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/** the flash page size (medium-density devices have 1KiB page size) */
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#define PAGE_SIZE 1024
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bool flash_internal_read(uint32_t address, uint8_t *buffer, size_t size)
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{
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// verify it's in the flash area and do other sanity checks
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if (address<FLASH_BASE || address>(UINT32_MAX-size) || (address+size)>(FLASH_BASE+DESIG_FLASH_SIZE*1024) || buffer==NULL || size==0) {
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return false;
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}
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// copy data byte per byte (a more efficient way would be to copy words, than the remaining bytes)
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for (size_t i=0; i<size; i++) {
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buffer[i] = *((uint8_t*)address+i);
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}
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return true;
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}
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bool flash_internal_write(uint32_t address, uint8_t *buffer, size_t size)
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{
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// verify it's in the flash area and do other sanity checks
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if (address<FLASH_BASE || address>(UINT32_MAX-size) || (address+size)>(FLASH_BASE+DESIG_FLASH_SIZE*1024) || buffer==NULL || size==0 || size%2) {
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return false;
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}
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flash_unlock(); // unlock flash to be able to write it
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while (size) { // write page by page until all data has been written
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uint32_t page_start = address-(address%PAGE_SIZE); // get start of the current page
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bool erase = false; // verify if the flash to write is erased of if we need to erase the page
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for (uint32_t flash=address; flash<(address+size) && flash<(page_start+PAGE_SIZE); flash += 2) { // go through page
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if (*(uint16_t*)(flash)!=0xffff) { // is flash not erased
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erase = true; // the erase flash
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}
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}
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if (erase) { // make copy of the page to erase and erase it
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uint8_t page_data[PAGE_SIZE]; // a copy of the complete page before the erase it
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uint16_t page_i = 0; // index for page data
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// copy page before address
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for (uint32_t flash=page_start; flash<address && flash<(page_start+PAGE_SIZE) && page_i<sizeof(page_data); flash++) {
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page_data[page_i++] = *(uint8_t*)(flash);
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}
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// copy data starting at address
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while (size>0 && page_i<sizeof(page_data)) {
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page_data[page_i++] = *buffer;
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buffer++;
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address++;
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size--;
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}
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// copy data after buffer until end of page
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while (page_i<sizeof(page_data)) {
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page_data[page_i] = *(uint8_t*)(page_start+page_i);
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page_i++;
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}
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flash_erase_page(page_start); // erase current page
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if (flash_get_status_flags()!=FLASH_SR_EOP) { // operation went wrong
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flash_lock(); // lock back flash to protect it
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return false;
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}
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for (uint16_t i=0; i<PAGE_SIZE/2; i++) { // write whole page
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flash_program_half_word(page_start+i*2, *((uint16_t*)(page_data+i*2)));
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if (flash_get_status_flags()!=FLASH_SR_EOP) { // operation went wrong
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flash_lock(); // lock back flash to protect it
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return false;
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}
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if (*((uint16_t*)(page_data+i*2))!=*((uint16_t*)(page_start+i*2))) { // verify the programmed data is right
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flash_lock(); // lock back flash to protect it
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return false;
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}
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}
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} else { // simply data until end of page
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while (size>0 && address<(page_start+PAGE_SIZE)) {
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flash_program_half_word(address, *((uint16_t*)(buffer)));
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if (flash_get_status_flags()!=FLASH_SR_EOP) { // operation went wrong
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flash_lock(); // lock back flash to protect it
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return false;
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}
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if (*((uint16_t*)address)!=*((uint16_t*)buffer)) { // verify the programmed data is right
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flash_lock(); // lock back flash to protect it
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return false;
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}
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buffer += 2;
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address += 2;
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size -= 2;
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}
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}
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}
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flash_lock(); // lock back flash to protect it
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return true;
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}
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@ -0,0 +1,36 @@
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** library to read/write internal flash (API)
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* @file flash_internal.h
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2016-2017
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* @note peripherals used: none
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*/
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#pragma once
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/** read data from internal flash
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* @param[in] address start address of the data to read
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* @param[out] buffer where to store the read data
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* @param[in] size how much data to read, in bytes
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* @return if read succeeded
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*/
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bool flash_internal_read(uint32_t address, uint8_t *buffer, size_t size);
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/** write data to internal flash
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* @param[in] address start address where to write data to
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* @param[in] buffer data to be written
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* @param[in] size how much data to write, in bytes
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* @return if write succeeded
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*/
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bool flash_internal_write(uint32_t address, uint8_t *buffer, size_t size);
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