/*
* stm-flash.c
* -----------
* Functions for writing/erasing the STM32 internal flash memory.
* The flash is memory mapped, so no code is needed here to read it.
*
* Copyright (c) 2016, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "stm32f4xx_hal.h"
#include "stm-flash.h"
#include "stm-init.h"
/* Flash sector offsets from RM0090, Table 6. Flash module - 2 Mbyte dual bank organization */
#define FLASH_NUM_SECTORS 24
uint32_t flash_sector_offsets[FLASH_NUM_SECTORS + 1] = {
/* Bank 1 */
0x08000000, /* #0, 16 KBytes */
0x08004000, /* #1, 16 Kbytes */
0x08008000, /* #2, 16 Kbytes */
0x0800C000, /* #3, 16 Kbytes */
0x08010000, /* #4, 64 Kbytes */
0x08020000, /* #5, 128 Kbytes */
0x08040000, /* #6, 128 Kbytes */
0x08060000, /* #7, 128 Kbytes */
0x08080000, /* #8, 128 Kbytes */
0x080A0000, /* #9, 128 Kbytes */
0x080C0000, /* #10, 128 Kbytes */
0x080E0000, /* #11, 128 Kbytes */
/* Bank 2 */
0x08100000, /* #12, 16 Kbytes */
0x08104000, /* #13, 16 Kbytes */
0x08108000, /* #14, 16 Kbytes */
0x0810C000, /* #15, 16 Kbytes */
0x08110000, /* #16, 64 Kbytes */
0x08120000, /* #17, 128 Kbytes */
0x08140000, /* #18, 128 Kbytes */
0x08160000, /* #19, 128 Kbytes */
0x08180000, /* #20, 128 Kbytes */
0x081A0000, /* #21, 128 Kbytes */
0x081C0000, /* #22, 128 Kbytes */
0x081E0000, /* #23, 128 Kbytes */
0x08200000 /* first address *after* flash */
};
static int stm_flash_sector_num(const uint32_t offset)
{
int i;
if (offset < flash_sector_offsets[0])
return -1;
for (i = 0; i < FLASH_NUM_SECTORS; ++i)
if (offset < flash_sector_offsets[i + 1])
return i;
return -1;
}
int stm_flash_erase_sectors(const uint32_t start_offset, const uint32_t end_offset)
{
uint32_t start_sector = stm_flash_sector_num(start_offset);
uint32_t end_sector = stm_flash_sector_num(end_offset);
FLASH_EraseInitTypeDef FLASH_EraseInitStruct;
uint32_t SectorError = 0;
if (start_sector > end_sector) return -1;
if (start_sector < 0 || end_sector > FLASH_NUM_SECTORS) return -2;
FLASH_EraseInitStruct.Sector = start_sector;
FLASH_EraseInitStruct.NbSectors = (end_sector - start_sector) + 1;
FLASH_EraseInitStruct.TypeErase = TYPEERASE_SECTORS;
FLASH_EraseInitStruct.VoltageRange = VOLTAGE_RANGE_3;
HAL_FLASH_Unlock();
if (HAL_FLASHEx_Erase(&FLASH_EraseInitStruct, &SectorError) != HAL_OK) {
return -3;
}
HAL_FLASH_Lock();
if (SectorError == 0xFFFFFFFF) return 0;
return -3;
}
int stm_flash_write32(uint32_t offset, const uint32_t *buf, const uint32_t elements)
{
uint32_t sector = stm_flash_sector_num(offset);
uint32_t i, j;
if (offset == flash_sector_offsets[sector]) {
/* Request to write to beginning of a flash sector, erase it first. */
if (stm_flash_erase_sectors(offset, offset) != 0) {
return -1;
}
}
HAL_FLASH_Unlock();
for (i = 0; i < elements; i++) {
if ((j = HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, offset, buf[i])) != HAL_OK) {
return -2;
}
offset += 4;
}
HAL_FLASH_Lock();
return 1;
}
