Arti Zirk
244fdbc35c
subrepo: subdir: "libopencm3" merged: "f5813a54" upstream: origin: "https://github.com/libopencm3/libopencm3" branch: "master" commit: "f5813a54" git-subrepo: version: "0.4.3" origin: "???" commit: "???"
210 lines
5.5 KiB
C
210 lines
5.5 KiB
C
/** @defgroup flash_file FLASH peripheral API
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*
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* @ingroup peripheral_apis
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*
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* @brief <b>libopencm3 STM32G4xx FLASH</b>
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*
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* @version 1.0.0
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*
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* Benjamin Levine <benjamin@jesco.karoo.co.uk>
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* Ben Brewer <ben.brewer@codethink.co.uk>
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*
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* @date 30 July 2020
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*
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* This library supports the FLASH memory controller in the STM32G4
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* series of ARM Cortex Microcontrollers by ST Microelectronics.
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*
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* For the STM32G4xx, accessing FLASH memory is described briefly in
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* section 3 of the STM32G4 Reference Manual.
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*
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* LGPL License Terms @ref lgpl_license
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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) 2016 Benjamin Levine <benjamin@jesco.karoo.co.uk>
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* Copyright (C) 2020 Ben Brewer <ben.brewer@codethink.co.uk>
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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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/**@{*/
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#include <libopencm3/stm32/flash.h>
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/** @brief Wait until Last Operation has Ended
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* This loops indefinitely until an operation (write or erase) has completed
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* by testing the busy flag.
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*/
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void flash_wait_for_last_operation(void)
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{
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while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
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}
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/** @brief Clear the Programming Sequence Error Flag
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* This flag is set when incorrect programming configuration has been made.
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*/
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void flash_clear_pgserr_flag(void)
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{
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FLASH_SR |= FLASH_SR_PGSERR;
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}
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/** Clear programming size error flag */
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void flash_clear_size_flag(void)
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{
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FLASH_SR |= FLASH_SR_SIZERR;
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}
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/** @brief Clear the Programming Alignment Error Flag
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*/
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void flash_clear_pgaerr_flag(void)
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{
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FLASH_SR |= FLASH_SR_PGAERR;
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}
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/** @brief Clear the Write Protect Error Flag
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*/
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void flash_clear_wrperr_flag(void)
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{
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FLASH_SR |= FLASH_SR_WRPERR;
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}
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/** @brief Clear the Programming Error Status Flag
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*/
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void flash_clear_progerr_flag(void)
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{
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FLASH_SR |= FLASH_SR_PROGERR;
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}
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/** @brief Clear All Status Flags
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* Program error, end of operation, write protect error, busy.
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*/
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void flash_clear_status_flags(void)
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{
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flash_clear_pgserr_flag();
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flash_clear_size_flag();
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flash_clear_pgaerr_flag();
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flash_clear_wrperr_flag();
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flash_clear_progerr_flag();
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flash_clear_eop_flag();
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}
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/** @brief Lock the Option Byte Access
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* This disables write access to the option bytes. It is locked by default on
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* reset.
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*/
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void flash_lock_option_bytes(void)
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{
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FLASH_CR |= FLASH_CR_OPTLOCK;
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}
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/** @brief Program a 64 bit word to FLASH
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*
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* This performs all operations necessary to program a 64 bit word to FLASH memory.
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* The program error flag should be checked separately for the event that memory
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* was not properly erased.
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*
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* @param[in] address Starting address in Flash.
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* @param[in] data Double word to write
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*/
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void flash_program_double_word(uint32_t address, uint64_t data)
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{
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/* Ensure that all flash operations are complete. */
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flash_wait_for_last_operation();
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/* Enable writes to flash. */
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FLASH_CR |= FLASH_CR_PG;
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/* Program the each word separately. */
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MMIO32(address) = (uint32_t)data;
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MMIO32(address+4) = (uint32_t)(data >> 32);
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/* Wait for the write to complete. */
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flash_wait_for_last_operation();
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/* Disable writes to flash. */
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FLASH_CR &= ~FLASH_CR_PG;
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}
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/** @brief Program a Data Block to FLASH
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* This programs an arbitrary length data block to FLASH memory.
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* The program error flag should be checked separately for the event that
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* memory was not properly erased.
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* @param[in] address Starting address in Flash.
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* @param[in] data Pointer to start of data block.
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* @param[in] len Length of data block in bytes (multiple of 8).
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*/
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void flash_program(uint32_t address, uint8_t *data, uint32_t len)
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{
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for (uint32_t i = 0; i < len; i += 8) {
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flash_program_double_word(address+i, *(uint64_t*)(data + i));
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}
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}
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/** @brief Erase a page of FLASH
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* @param[in] page (0 - 255 for bank 1, 256-511 for bank 2)
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*/
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void flash_erase_page(uint32_t page)
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{
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flash_wait_for_last_operation();
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/* page and bank are contiguous bits */
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FLASH_CR &= ~((FLASH_CR_PNB_MASK << FLASH_CR_PNB_SHIFT) | FLASH_CR_BKER);
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if (page > 255) {
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FLASH_CR |= FLASH_CR_BKER;
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}
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FLASH_CR |= page << FLASH_CR_PNB_SHIFT;
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FLASH_CR |= FLASH_CR_PER;
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FLASH_CR |= FLASH_CR_START;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_CR_PER;
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}
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/** @brief Erase All FLASH
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* This performs all operations necessary to erase all sectors in the FLASH
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* memory.
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*/
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void flash_erase_all_pages(void)
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{
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flash_wait_for_last_operation();
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FLASH_CR |= FLASH_CR_MER1 | FLASH_CR_MER2;
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FLASH_CR |= FLASH_CR_START;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_CR_MER1 & ~FLASH_CR_MER2;
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}
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/** @brief Program the Option Bytes
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* This performs all operations necessary to program the option bytes.
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* The option bytes do not need to be erased first.
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* @param[in] data value to be programmed.
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*/
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void flash_program_option_bytes(uint32_t data)
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{
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flash_wait_for_last_operation();
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if (FLASH_CR & FLASH_CR_OPTLOCK) {
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flash_unlock_option_bytes();
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}
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FLASH_OPTR = data;
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FLASH_CR |= FLASH_CR_OPTSTRT;
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flash_wait_for_last_operation();
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}
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/**@}*/
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