139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
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/** @addtogroup flash_file
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*
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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* Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
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* Copyright (C) 2012-13 Karl Palsson <karlp@tweak.net.au>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Flash routines shared by L0/L1. L4 has a different flash controller */
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/**@{*/
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#include <libopencm3/stm32/flash.h>
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/**
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* Unlock primary access to the flash control/erase block
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* You must call this before using any of the low level routines
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* yourself.
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* @sa flash_unlock
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*/
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void flash_unlock_pecr(void)
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{
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FLASH_PEKEYR = FLASH_PEKEYR_PEKEY1;
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FLASH_PEKEYR = FLASH_PEKEYR_PEKEY2;
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}
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void flash_lock_pecr(void)
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{
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FLASH_PECR |= FLASH_PECR_PELOCK;
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}
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/**
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* Unlock program memory itself.
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* Writes the magic sequence to unlock the program memory
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* you must have already unlocked access to this register!
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* @sa flash_unlock_pecr
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*/
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void flash_unlock_progmem(void)
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{
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FLASH_PRGKEYR = FLASH_PRGKEYR_PRGKEY1;
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FLASH_PRGKEYR = FLASH_PRGKEYR_PRGKEY2;
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}
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void flash_lock_progmem(void)
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{
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FLASH_PECR |= FLASH_PECR_PRGLOCK;
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}
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void flash_lock_option_bytes(void)
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{
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FLASH_PECR |= FLASH_PECR_OPTLOCK;
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}
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/** @brief Unlock all segments of flash
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*
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*/
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void flash_unlock(void)
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{
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flash_unlock_pecr();
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flash_unlock_progmem();
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flash_unlock_option_bytes();
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}
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/** @brief Lock all segments of flash
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*
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*/
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void flash_lock(void)
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{
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flash_lock_option_bytes();
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flash_lock_progmem();
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flash_lock_pecr();
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}
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/** @brief Unlock RUN_PD bit from FLASH_ACR register.
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*/
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void flash_unlock_acr(void)
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{
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FLASH_PDKEYR = FLASH_PDKEYR_PDKEY1;
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FLASH_PDKEYR = FLASH_PDKEYR_PDKEY2;
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}
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/** @brief Write a word to eeprom
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*
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* @param address assumed to be in the eeprom space, no checking
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* @param data word to write
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*/
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void eeprom_program_word(uint32_t address, uint32_t data)
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{
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flash_unlock_pecr();
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/* erase only if needed */
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FLASH_PECR &= ~FLASH_PECR_FTDW;
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MMIO32(address) = data;
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flash_lock_pecr();
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}
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/** @brief Write a block of words to eeprom
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*
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* Writes a block of words to EEPROM at the requested address, erasing if
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* necessary, and locking afterwards. Only wordwise writing is safe for
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* writing any value
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*
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* @param[in] address must point to EEPROM space, no checking!
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* @param[in] data pointer to data to write
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* @param[in] length_in_words size of of data in WORDS!
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*/
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void eeprom_program_words(uint32_t address, uint32_t *data, int length_in_words)
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{
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int i;
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flash_unlock_pecr();
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while (FLASH_SR & FLASH_SR_BSY);
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/* erase only if needed */
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FLASH_PECR &= ~FLASH_PECR_FTDW;
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for (i = 0; i < length_in_words; i++) {
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MMIO32(address + (i * sizeof(uint32_t))) = *(data+i);
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while (FLASH_SR & FLASH_SR_BSY);
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}
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flash_lock_pecr();
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}
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/**@}*/
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