292 lines
8.1 KiB
C
292 lines
8.1 KiB
C
/** @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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*
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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 Set the Program Parallelism Size
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Set the programming word width. Note carefully the power supply voltage
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restrictions under which the different word sizes may be used. See the
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programming manual for more information.
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@param[in] psize The programming word width one of: @ref flash_cr_program_width
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*/
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static inline void flash_set_program_size(uint32_t psize)
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{
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FLASH_CR &= ~(FLASH_CR_PROGRAM_MASK << FLASH_CR_PROGRAM_SHIFT);
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FLASH_CR |= psize << FLASH_CR_PROGRAM_SHIFT;
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}
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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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/** Clear programming parallelism error flag
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*/
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void flash_clear_pgperr_flag(void)
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{
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FLASH_SR |= FLASH_SR_PGPERR;
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}
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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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/*---------------------------------------------------------------------------*/
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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_OPTCR |= FLASH_OPTCR_OPTLOCK;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Program a 64 bit Word to FLASH
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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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@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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flash_set_program_size(FLASH_CR_PROGRAM_X64);
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/* Enable writes to flash. */
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FLASH_CR |= FLASH_CR_PG;
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/* Program the double_word. */
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MMIO64(address) = data;
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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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/*---------------------------------------------------------------------------*/
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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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@param[in] address Starting address in Flash.
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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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/* Ensure that all flash operations are complete. */
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flash_wait_for_last_operation();
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flash_set_program_size(FLASH_CR_PROGRAM_X32);
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/* Enable writes to flash. */
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FLASH_CR |= FLASH_CR_PG;
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/* Program the word. */
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MMIO32(address) = data;
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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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/*---------------------------------------------------------------------------*/
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/** @brief Program a Half Word to FLASH
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This performs all operations necessary to program a 16 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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@param[in] address Starting address in Flash.
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@param[in] data half word to write
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*/
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void flash_program_half_word(uint32_t address, uint16_t data)
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{
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flash_wait_for_last_operation();
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flash_set_program_size(FLASH_CR_PROGRAM_X16);
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FLASH_CR |= FLASH_CR_PG;
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MMIO16(address) = data;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_CR_PG; /* Disable the PG bit. */
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Program an 8 bit Byte to FLASH
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This performs all operations necessary to program an 8 bit byte 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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@param[in] address Starting address in Flash.
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@param[in] data byte to write
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*/
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void flash_program_byte(uint32_t address, uint8_t data)
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{
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flash_wait_for_last_operation();
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flash_set_program_size(FLASH_CR_PROGRAM_X8);
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FLASH_CR |= FLASH_CR_PG;
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MMIO8(address) = data;
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_CR_PG; /* Disable the PG bit. */
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}
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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 memory
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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.
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*/
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void flash_program(uint32_t address, const uint8_t *data, uint32_t len)
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{
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/* TODO: Use dword and word size program operations where possible for
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* turbo speed.
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*/
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uint32_t i;
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for (i = 0; i < len; i++) {
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flash_program_byte(address+i, data[i]);
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Erase a Sector of FLASH
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This performs all operations necessary to erase a sector in FLASH memory.
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The page should be checked to ensure that it was properly erased. A sector must
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first be fully erased before attempting to program it.
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See the reference manual or the FLASH programming manual for details.
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@param[in] sector (0 - 11 for some parts, 0-23 on others)
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@param program_size: 0 (8-bit), 1 (16-bit), 2 (32-bit), 3 (64-bit)
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*/
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void flash_erase_sector(uint8_t sector, uint32_t program_size)
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{
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flash_wait_for_last_operation();
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flash_set_program_size(program_size);
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/* Sector numbering is not contiguous internally! */
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if (sector >= 12) {
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sector += 4;
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}
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FLASH_CR &= ~(FLASH_CR_SNB_MASK << FLASH_CR_SNB_SHIFT);
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FLASH_CR |= (sector & FLASH_CR_SNB_MASK) << FLASH_CR_SNB_SHIFT;
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FLASH_CR |= FLASH_CR_SER;
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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_SER;
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FLASH_CR &= ~(FLASH_CR_SNB_MASK << FLASH_CR_SNB_SHIFT);
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}
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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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@param program_size: 0 (8-bit), 1 (16-bit), 2 (32-bit), 3 (64-bit)
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*/
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void flash_erase_all_sectors(uint32_t program_size)
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{
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flash_wait_for_last_operation();
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flash_set_program_size(program_size);
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FLASH_CR |= FLASH_CR_MER; /* Enable mass erase. */
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FLASH_CR |= FLASH_CR_STRT; /* Trigger the erase. */
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flash_wait_for_last_operation();
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FLASH_CR &= ~FLASH_CR_MER; /* Disable mass 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 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_OPTCR & FLASH_OPTCR_OPTLOCK) {
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flash_unlock_option_bytes();
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}
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FLASH_OPTCR = data & ~0x3;
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FLASH_OPTCR |= FLASH_OPTCR_OPTSTRT; /* Enable option byte prog. */
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flash_wait_for_last_operation();
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}
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/**@}*/
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