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138 lines
3.9 KiB
138 lines
3.9 KiB
/** @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) 2014 Ken Sarkies <ksarkies@internode.on.net>
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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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/*---------------------------------------------------------------------------*/
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/** @brief Unlock the Flash Program and Erase Controller
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This enables write access to the Flash memory. It is locked by default on
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reset.
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*/
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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_pgerr_flag(void)
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{
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FLASH_SR |= FLASH_SR_PGERR;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Clear the Write Protect Error Status Flag
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*/
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void flash_clear_wrprterr_flag(void)
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{
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FLASH_SR |= FLASH_SR_WRPRTERR;
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}
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/*---------------------------------------------------------------------------*/
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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 by
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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_get_status_flags() & FLASH_SR_BSY) == FLASH_SR_BSY);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Program a 32 bit Word to FLASH
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This performs all operations necessary to program a 32 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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Status bit polling is used to detect end of operation.
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@param[in] address Full address of flash word to be programmed.
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@param[in] data word to write
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*/
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void flash_program_word(uint32_t address, uint32_t data)
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{
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flash_program_half_word(address, (uint16_t)data);
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flash_program_half_word(address+2, (uint16_t)(data>>16));
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Erase All Option Bytes
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This performs all operations necessary to erase the option bytes. These must
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first be fully erased before attempting to program them, therefore it is
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recommended to check these after an erase attempt.
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*/
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void flash_erase_option_bytes(void)
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{
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flash_wait_for_last_operation();
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if ((FLASH_CR & FLASH_CR_OPTWRE) == 0) {
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flash_unlock_option_bytes();
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}
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FLASH_CR |= FLASH_CR_OPTER; /* Enable option byte erase. */
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FLASH_CR |= FLASH_CR_STRT;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_CR_OPTER; /* Disable option byte erase. */
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}
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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 write protect error flag should be checked separately for the event that
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an option byte had not been properly erased before calling this function.
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Only the lower 8 bits of the data is significant.
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@param[in] address Address of option byte from @ref flash_options.
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@param[in] data value to write
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*/
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void flash_program_option_bytes(uint32_t address, uint16_t data)
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{
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flash_wait_for_last_operation();
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if ((FLASH_CR & FLASH_CR_OPTWRE) == 0) {
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flash_unlock_option_bytes();
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}
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FLASH_CR |= FLASH_CR_OPTPG; /* Enable option byte programming. */
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MMIO16(address) = data;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_CR_OPTPG; /* Disable option byte programming. */
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}
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/**@}*/
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