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/** @defgroup flash_file FLASH
*
* @ingroup STM32L4xx
*
* @brief <b>libopencm3 STM32L4xx FLASH</b>
*
* @version 1.0.0
*
* Benjamin Levine <benjamin@jesco.karoo.co.uk>
*
* @date 12 February 2016
*
* This library supports the FLASH memory controller in the STM32L4
* series of ARM Cortex Microcontrollers by ST Microelectronics.
*
* For the STM32L4xx, accessing FLASH memory is described briefly in
* section 3 of the STM32L4x6 Reference Manual.
*
* LGPL License Terms @ref lgpl_license
*/
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2016 Benjamin Levine <benjamin@jesco.karoo.co.uk>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/**@{*/
#include <libopencm3/stm32/flash.h>
/** @brief Wait until Last Operation has Ended
* This loops indefinitely until an operation (write or erase) has completed
* by testing the busy flag.
*/
void flash_wait_for_last_operation(void)
{
while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
}
/** @brief Clear the Programming Sequence Error Flag
* This flag is set when incorrect programming configuration has been made.
*/
void flash_clear_pgserr_flag(void)
{
FLASH_SR |= FLASH_SR_PGSERR;
}
/** Clear programming size error flag */
void flash_clear_size_flag(void)
{
FLASH_SR |= FLASH_SR_SIZERR;
}
/** @brief Clear the Programming Alignment Error Flag
*/
void flash_clear_pgaerr_flag(void)
{
FLASH_SR |= FLASH_SR_PGAERR;
}
/** @brief Clear the Write Protect Error Flag
*/
void flash_clear_wrperr_flag(void)
{
FLASH_SR |= FLASH_SR_WRPERR;
}
/** @brief Clear the Programming Error Status Flag
*/
void flash_clear_progerr_flag(void)
{
FLASH_SR |= FLASH_SR_PROGERR;
}
/** @brief Clear All Status Flags
* Program error, end of operation, write protect error, busy.
*/
void flash_clear_status_flags(void)
{
flash_clear_pgserr_flag();
flash_clear_size_flag();
flash_clear_pgaerr_flag();
flash_clear_wrperr_flag();
flash_clear_progerr_flag();
flash_clear_eop_flag();
}
/** @brief Lock the Option Byte Access
* This disables write access to the option bytes. It is locked by default on
* reset.
*/
void flash_lock_option_bytes(void)
{
FLASH_CR |= FLASH_CR_OPTLOCK;
}
/** @brief Program a 32 bit Word to FLASH
* This performs all operations necessary to program a 32 bit word to FLASH
* memory. The program error flag should be checked separately for the event
* that memory was not properly erased.
*
* @param[in] address Starting address in Flash.
* @param[in] data word to write
*/
void flash_program_word(uint32_t address, uint32_t data)
{
/* Ensure that all flash operations are complete. */
flash_wait_for_last_operation();
/* Enable writes to flash. */
FLASH_CR |= FLASH_CR_PG;
/* Program the word. */
MMIO32(address) = data;
/* Wait for the write to complete. */
flash_wait_for_last_operation();
/* Disable writes to flash. */
FLASH_CR &= ~FLASH_CR_PG;
}
/** @brief Program a Data Block to FLASH
* This programs an arbitrary length data block to FLASH memory.
* The program error flag should be checked separately for the event that
* memory was not properly erased.
* @param[in] address Starting address in Flash.
* @param[in] data Pointer to start of data block.
* @param[in] len Length of data block.
*/
void flash_program(uint32_t address, uint8_t *data, uint32_t len)
{
/* TODO: Use dword and word size program operations where possible for
* turbo speed.
*/
uint32_t i;
for (i = 0; i < len; i++) {
flash_program_word(address+i, data[i]);
}
}
/** @brief Erase a page of FLASH
* @param[in] page (0 - 255 for bank 1, 256-511 for bank 2)
*/
void flash_erase_page(uint32_t page)
{
flash_wait_for_last_operation();
/* page and bank are contiguous bits */
FLASH_CR &= ~((FLASH_CR_PNB_MASK << FLASH_CR_PNB_SHIFT) | FLASH_CR_BKER);
FLASH_CR |= page << FLASH_CR_PNB_SHIFT;
FLASH_CR |= FLASH_CR_PER;
FLASH_CR |= FLASH_CR_START;
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_CR_PER;
}
/** @brief Erase All FLASH
* This performs all operations necessary to erase all sectors in the FLASH
* memory.
*/
void flash_erase_all_pages(void)
{
flash_wait_for_last_operation();
FLASH_CR |= FLASH_CR_MER1 | FLASH_CR_MER2;
FLASH_CR |= FLASH_CR_START;
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_CR_MER1 & ~FLASH_CR_MER2;
}
/** @brief Program the Option Bytes
* This performs all operations necessary to program the option bytes.
* The option bytes do not need to be erased first.
* @param[in] data value to be programmed.
*/
void flash_program_option_bytes(uint32_t data)
{
flash_wait_for_last_operation();
if (FLASH_CR & FLASH_CR_OPTLOCK) {
flash_unlock_option_bytes();
}
FLASH_OPTR = data & ~0x3;
FLASH_OPTR |= FLASH_CR_OPTSTRT;
flash_wait_for_last_operation();
}
/**@}*/
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