lora-car/libopencm3/lib/stm32/common/flash_common_l01.c
Arti Zirk 054740c5de git subrepo clone https://github.com/libopencm3/libopencm3.git
subrepo:
  subdir:   "libopencm3"
  merged:   "88e91c9a7cce"
upstream:
  origin:   "https://github.com/libopencm3/libopencm3.git"
  branch:   "master"
  commit:   "88e91c9a7cce"
git-subrepo:
  version:  "0.4.3"
  origin:   "???"
  commit:   "???"
2023-01-21 21:54:42 +02:00

165 lines
4.2 KiB
C

/** @addtogroup flash_file
*
*/
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
* Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
* Copyright (C) 2012-13 Karl Palsson <karlp@tweak.net.au>
*
* 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/>.
*/
/* Flash routines shared by L0/L1. L4 has a different flash controller */
/**@{*/
#include <libopencm3/stm32/flash.h>
/**
* Unlock primary access to the flash control/erase block
* You must call this before using any of the low level routines
* yourself.
* @sa flash_unlock
*/
void flash_unlock_pecr(void)
{
FLASH_PEKEYR = FLASH_PEKEYR_PEKEY1;
FLASH_PEKEYR = FLASH_PEKEYR_PEKEY2;
}
void flash_lock_pecr(void)
{
FLASH_PECR |= FLASH_PECR_PELOCK;
}
/**
* Unlock program memory itself.
* Writes the magic sequence to unlock the program memory
* you must have already unlocked access to this register!
* @sa flash_unlock_pecr
*/
void flash_unlock_progmem(void)
{
FLASH_PRGKEYR = FLASH_PRGKEYR_PRGKEY1;
FLASH_PRGKEYR = FLASH_PRGKEYR_PRGKEY2;
}
void flash_lock_progmem(void)
{
FLASH_PECR |= FLASH_PECR_PRGLOCK;
}
void flash_lock_option_bytes(void)
{
FLASH_PECR |= FLASH_PECR_OPTLOCK;
}
/** @brief Unlock all segments of flash
*
*/
void flash_unlock(void)
{
flash_unlock_pecr();
flash_unlock_progmem();
flash_unlock_option_bytes();
}
/** @brief Lock all segments of flash
*
*/
void flash_lock(void)
{
flash_lock_option_bytes();
flash_lock_progmem();
flash_lock_pecr();
}
/** @brief Unlock RUN_PD bit from FLASH_ACR register.
*/
void flash_unlock_acr(void)
{
FLASH_PDKEYR = FLASH_PDKEYR_PDKEY1;
FLASH_PDKEYR = FLASH_PDKEYR_PDKEY2;
}
void flash_erase_page(uint32_t page_address)
{
FLASH_PECR |= FLASH_PECR_ERASE | FLASH_PECR_PROG;
MMIO32(page_address) = 0;
while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
FLASH_PECR &= ~(FLASH_PECR_ERASE | FLASH_PECR_PROG);
}
/* Must be run from RAM (per ref manual), and because it's in ram, more
* than 64MB away from flash address space, must be a long_call. */
__attribute__ ((long_call, section (".ramtext")))
void flash_program_half_page(uint32_t *dst, void *buf)
{
uint32_t *src = buf;
/* Enable half page writes to program memory */
FLASH_PECR |= FLASH_PECR_FPRG | FLASH_PECR_PROG;
while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
for (int i = 0; i < FLASH_HALF_PAGE_SIZE; i++) {
*dst++ = *src++;
}
while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
FLASH_PECR &= ~(FLASH_PECR_FPRG | FLASH_PECR_PROG);
}
/** @brief Write a word to eeprom
*
* @param address assumed to be in the eeprom space, no checking
* @param data word to write
*/
void eeprom_program_word(uint32_t address, uint32_t data)
{
flash_unlock_pecr();
/* erase only if needed */
FLASH_PECR &= ~FLASH_PECR_FTDW;
MMIO32(address) = data;
flash_lock_pecr();
}
/** @brief Write a block of words to eeprom
*
* Writes a block of words to EEPROM at the requested address, erasing if
* necessary, and locking afterwards. Only wordwise writing is safe for
* writing any value
*
* @param[in] address must point to EEPROM space, no checking!
* @param[in] data pointer to data to write
* @param[in] length_in_words size of of data in WORDS!
*/
void eeprom_program_words(uint32_t address, uint32_t *data, int length_in_words)
{
int i;
flash_unlock_pecr();
while (FLASH_SR & FLASH_SR_BSY);
/* erase only if needed */
FLASH_PECR &= ~FLASH_PECR_FTDW;
for (i = 0; i < length_in_words; i++) {
MMIO32(address + (i * sizeof(uint32_t))) = *(data+i);
while (FLASH_SR & FLASH_SR_BSY);
}
flash_lock_pecr();
}
/**@}*/