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openblt/Target/Source/ARMCM3_STM32L1/flash.c

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/************************************************************************************//**
* \file Source/ARMCM3_STM32L1/flash.c
* \brief Bootloader flash driver source file.
* \ingroup Target_ARMCM3_STM32L1
* \internal
*----------------------------------------------------------------------------------------
* C O P Y R I G H T
*----------------------------------------------------------------------------------------
* Copyright (c) 2022 by Feaser http://www.feaser.com All rights reserved
*
*----------------------------------------------------------------------------------------
* L I C E N S E
*----------------------------------------------------------------------------------------
* This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* OpenBLT 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 General Public License for more details.
*
* You have received a copy of the GNU General Public License along with OpenBLT. It
* should be located in ".\Doc\license.html". If not, contact Feaser to obtain a copy.
*
* \endinternal
****************************************************************************************/
/****************************************************************************************
* Include files
****************************************************************************************/
#include "boot.h" /* bootloader generic header */
#include "stm32l1xx.h" /* STM32 CPU and HAL header */
/****************************************************************************************
* Macro definitions
****************************************************************************************/
/** \brief Value for an invalid flash address. */
#define FLASH_INVALID_ADDRESS (0xffffffff)
/** \brief Standard size of a flash block for writing. */
#define FLASH_WRITE_BLOCK_SIZE (512)
/** \brief Total numbers of segments in array flashLayout[]. */
#define FLASH_TOTAL_SEGMENTS (sizeof(flashLayout)/sizeof(flashLayout[0]))
/** \brief Index of the last segment in array flashLayout[]. */
#define FLASH_LAST_SEGMENT_IDX (FLASH_TOTAL_SEGMENTS-1)
/** \brief Start address of the bootloader programmable flash. */
#define FLASH_START_ADDRESS (flashLayout[0].sector_start)
/** \brief End address of the bootloader programmable flash. */
#define FLASH_END_ADDRESS (flashLayout[FLASH_LAST_SEGMENT_IDX].sector_start + \
flashLayout[FLASH_LAST_SEGMENT_IDX].sector_size - 1)
/** \brief Number of bytes to erase per erase operation. Usually this is set to the value
* as defined by hardware (FLASH_PAGE_SIZE). However, on the STM32L1, this value
* is less than FLASH_WRITE_BLOCK_SIZE, which would lead to problems. Therefore
* this macro was set to a value that is a multiple of bothFLASH_WRITE_BLOCK_SIZE
* and FLASH_PAGE_SIZE.
*/
#define FLASH_ERASE_BLOCK_SIZE (2048)
/** \brief Offset into the user program's vector table where the checksum is located.
* For this target it is set to the end of the vector table. Note that the
* value can be overridden in blt_conf.h, because the size of the vector table
* could vary. When changing this value, don't forget to update the location
* of the checksum in the user program accordingly. Otherwise the checksum
* verification will always fail.
*/
#ifndef BOOT_FLASH_VECTOR_TABLE_CS_OFFSET
#define BOOT_FLASH_VECTOR_TABLE_CS_OFFSET (0x13C)
#endif
/****************************************************************************************
* Plausibility checks
****************************************************************************************/
#if (BOOT_FLASH_VECTOR_TABLE_CS_OFFSET >= FLASH_WRITE_BLOCK_SIZE)
#error "BOOT_FLASH_VECTOR_TABLE_CS_OFFSET is set too high. It must be located in the first writable block."
#endif
#ifndef BOOT_FLASH_CUSTOM_LAYOUT_ENABLE
#define BOOT_FLASH_CUSTOM_LAYOUT_ENABLE (0u)
#endif
/****************************************************************************************
* Type definitions
****************************************************************************************/
/** \brief Flash sector descriptor type. */
typedef struct
{
blt_addr sector_start; /**< sector start address */
blt_int32u sector_size; /**< sector size in bytes */
} tFlashSector;
/** \brief Structure type for grouping flash block information.
* \details Programming is done per block of max FLASH_WRITE_BLOCK_SIZE. for this a
* flash block manager is implemented in this driver. this flash block manager
* depends on this flash block info structure. It holds the base address of
* the flash block and the data that should be programmed into the flash
* block. The .base_addr must be a multiple of FLASH_WRITE_BLOCK_SIZE.
*/
typedef struct
{
blt_addr base_addr;
blt_int8u data[FLASH_WRITE_BLOCK_SIZE];
} tFlashBlockInfo;
/****************************************************************************************
* Hook functions
****************************************************************************************/
#if (BOOT_FLASH_CRYPTO_HOOKS_ENABLE > 0)
extern blt_bool FlashCryptoDecryptDataHook(blt_addr address, blt_int8u * data,
blt_int32u size);
#endif
/****************************************************************************************
* Function prototypes
****************************************************************************************/
static blt_bool FlashInitBlock(tFlashBlockInfo *block, blt_addr address);
static tFlashBlockInfo *FlashSwitchBlock(tFlashBlockInfo *block, blt_addr base_addr);
static blt_bool FlashAddToBlock(tFlashBlockInfo *block, blt_addr address,
blt_int8u *data, blt_int32u len);
static blt_bool FlashWriteBlock(tFlashBlockInfo *block);
/****************************************************************************************
* Local constant declarations
****************************************************************************************/
/** \brief If desired, it is possible to set BOOT_FLASH_CUSTOM_LAYOUT_ENABLE to > 0
* in blt_conf.h and then implement your own version of the flashLayout[] table
* in a source-file with the name flash_layout.c. This way you customize the
* flash memory size reserved for the bootloader, without having to modify
* the flashLayout[] table in this file directly. This file will then include
* flash_layout.c so there is no need to compile it additionally with your
* project.
*/
#if (BOOT_FLASH_CUSTOM_LAYOUT_ENABLE == 0)
/** \brief Array wit the layout of the flash memory.
* \details Also controls what part of the flash memory is reserved for the bootloader.
* If the bootloader size changes, the reserved sectors for the bootloader
* might need adjustment to make sure the bootloader doesn't get overwritten.
* The current flash layout does not reflect the minimum sector size of the
* physical flash (128 bytes), because this would make the table quit long and
* a waste of ROM. The minimum sector size is only really needed when erasing
* the flash. This can still be done in combination with macro
* FLASH_ERASE_BLOCK_SIZE.
*/
static const tFlashSector flashLayout[] =
{
/* space is reserved for a bootloader configuration with all supported communication
* interfaces enabled. when for example only UART is needed, than the space required
* for the bootloader can be made a lot smaller here.
*/
/* { 0x08000000, 0x00800 }, flash sector 0 - reserved for bootloader */
/* { 0x08000800, 0x00800 }, flash sector 1 - reserved for bootloader */
/* { 0x08001000, 0x00800 }, flash sector 2 - reserved for bootloader */
/* { 0x08001800, 0x00800 }, flash sector 3 - reserved for bootloader */
{ 0x08002000, 0x00800 }, /* flash sector 4 - 2kb */
{ 0x08002800, 0x00800 }, /* flash sector 5 - 2kb */
{ 0x08003000, 0x00800 }, /* flash sector 6 - 2kb */
{ 0x08003800, 0x00800 }, /* flash sector 7 - 2kb */
{ 0x08004000, 0x00800 }, /* flash sector 8 - 2kb */
{ 0x08004800, 0x00800 }, /* flash sector 9 - 2kb */
{ 0x08005000, 0x00800 }, /* flash sector 10 - 2kb */
{ 0x08005800, 0x00800 }, /* flash sector 11 - 2kb */
{ 0x08006000, 0x00800 }, /* flash sector 12 - 2kb */
{ 0x08006800, 0x00800 }, /* flash sector 13 - 2kb */
{ 0x08007000, 0x00800 }, /* flash sector 14 - 2kb */
{ 0x08007800, 0x00800 }, /* flash sector 15 - 2kb */
#if (BOOT_NVM_SIZE_KB > 32)
{ 0x08008000, 0x08000 }, /* flash sector 16-31 - 32kb */
#endif
#if (BOOT_NVM_SIZE_KB > 64)
{ 0x08010000, 0x08000 }, /* flash sector 32-47 - 32kb */
{ 0x08018000, 0x08000 }, /* flash sector 48-63 - 32kb */
#endif
#if (BOOT_NVM_SIZE_KB > 128)
{ 0x08020000, 0x08000 }, /* flash sector 64-79 - 32kb */
{ 0x08028000, 0x08000 }, /* flash sector 80-95 - 32kb */
#endif
#if (BOOT_NVM_SIZE_KB > 192)
{ 0x08030000, 0x08000 }, /* flash sector 96-111 - 32kb */
{ 0x08038000, 0x08000 }, /* flash sector 112-127 - 32kb */
#endif
#if (BOOT_NVM_SIZE_KB > 256)
{ 0x08040000, 0x08000 }, /* flash sector 128-143 - 32kb */
{ 0x08048000, 0x08000 }, /* flash sector 144-159 - 32kb */
{ 0x08050000, 0x08000 }, /* flash sector 160-175 - 32kb */
{ 0x08058000, 0x08000 }, /* flash sector 176-191 - 32kb */
#endif
#if (BOOT_NVM_SIZE_KB > 384)
{ 0x08060000, 0x08000 }, /* flash sector 192-207 - 32kb */
{ 0x08068000, 0x08000 }, /* flash sector 208-223 - 32kb */
{ 0x08070000, 0x08000 }, /* flash sector 224-239 - 32kb */
{ 0x08078000, 0x08000 }, /* flash sector 240-255 - 32kb */
#endif
#if (BOOT_NVM_SIZE_KB > 512)
#error "BOOT_NVM_SIZE_KB > 512 is currently not supported."
#endif
};
#else
#include "flash_layout.c"
#endif /* BOOT_FLASH_CUSTOM_LAYOUT_ENABLE == 0 */
/****************************************************************************************
* Local data declarations
****************************************************************************************/
/** \brief Local variable with information about the flash block that is currently
* being operated on.
* \details The smallest amount of flash that can be programmed is
* FLASH_WRITE_BLOCK_SIZE. A flash block manager is implemented in this driver
* and stores info in this variable. Whenever new data should be flashed, it
* is first added to a RAM buffer, which is part of this variable. Whenever
* the RAM buffer, which has the size of a flash block, is full or data needs
* to be written to a different block, the contents of the RAM buffer are
* programmed to flash. The flash block manager requires some software
* overhead, yet results is faster flash programming because data is first
* harvested, ideally until there is enough to program an entire flash block,
* before the flash device is actually operated on.
*/
static tFlashBlockInfo blockInfo;
/** \brief Local variable with information about the flash boot block.
* \details The first block of the user program holds the vector table, which on the
* STM32 is also the where the checksum is written to. Is it likely that
* the vector table is first flashed and then, at the end of the programming
* sequence, the checksum. This means that this flash block need to be written
* to twice. Normally this is not a problem with flash memory, as long as you
* write the same values to those bytes that are not supposed to be changed
* and the locations where you do write to are still in the erased 0xFF state.
* Unfortunately, writing twice to flash this way, does not work reliably on
* all micros. This is why we need to have an extra block, the bootblock,
* placed under the management of the block manager. This way is it possible
* to implement functionality so that the bootblock is only written to once
* at the end of the programming sequence.
*/
static tFlashBlockInfo bootBlockInfo;
/************************************************************************************//**
** \brief Initializes the flash driver.
** \return none.
**
****************************************************************************************/
void FlashInit(void)
{
/* configuration checks. the flash organization of the STM32L1 is a bit unusual as
* the minimum size to erase as defined by hardware (FLASH_PAGE_SIZE), is smaller than
* the write block size (FLASH_WRITE_BLOCK_SIZE). this leads to problems because it
* is then possible to erase a chunk that is less than FLASH_WRITE_BLOCK_SIZE, but
* write operations will always write at least FLASH_WRITE_BLOCK_SIZE. This can lead
* to a situation where unerased flash gets written, which will not work.
*
* Therefore FLASH_ERASE_BLOCK_SIZE was set to a higher value than both FLASH_PAGE_SIZE
* and FLASH_WRITE_BLOCK_SIZE. Just verify that its configuration is actually valid.
*/
ASSERT_CT(FLASH_ERASE_BLOCK_SIZE >= FLASH_WRITE_BLOCK_SIZE);
ASSERT_CT((FLASH_ERASE_BLOCK_SIZE % FLASH_WRITE_BLOCK_SIZE == 0));
ASSERT_CT(FLASH_ERASE_BLOCK_SIZE >= FLASH_PAGE_SIZE);
ASSERT_CT((FLASH_ERASE_BLOCK_SIZE % FLASH_PAGE_SIZE) == 0);
/* init the flash block info structs by setting the address to an invalid address */
blockInfo.base_addr = FLASH_INVALID_ADDRESS;
bootBlockInfo.base_addr = FLASH_INVALID_ADDRESS;
} /*** end of FlashInit ***/
/************************************************************************************//**
** \brief Reinitializes the flash driver.
** \return none.
**
****************************************************************************************/
void FlashReinit(void)
{
/* init the flash block info structs by setting the address to an invalid address */
blockInfo.base_addr = FLASH_INVALID_ADDRESS;
bootBlockInfo.base_addr = FLASH_INVALID_ADDRESS;
} /*** end of FlashReinit ***/
/************************************************************************************//**
** \brief Writes the data to flash through a flash block manager. Note that this
** function also checks that no data is programmed outside the flash
** memory region, so the bootloader can never be overwritten.
** \param addr Start address.
** \param len Length in bytes.
** \param data Pointer to the data buffer.
** \return BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
blt_bool FlashWrite(blt_addr addr, blt_int32u len, blt_int8u *data)
{
blt_addr base_addr;
/* validate the len parameter */
if ((len - 1) > (FLASH_END_ADDRESS - addr))
{
return BLT_FALSE;
}
/* make sure the addresses are within the flash device */
if ((addr < FLASH_START_ADDRESS) || ((addr+len-1) > FLASH_END_ADDRESS))
{
return BLT_FALSE;
}
/* if this is the bootblock, then let the boot block manager handle it */
base_addr = (addr/FLASH_WRITE_BLOCK_SIZE)*FLASH_WRITE_BLOCK_SIZE;
if (base_addr == flashLayout[0].sector_start)
{
/* let the boot block manager handle it */
return FlashAddToBlock(&bootBlockInfo, addr, data, len);
}
/* let the block manager handle it */
return FlashAddToBlock(&blockInfo, addr, data, len);
} /*** end of FlashWrite ***/
/************************************************************************************//**
** \brief Erases the flash memory. Note that this function also checks that no
** data is erased outside the flash memory region, so the bootloader can
** never be erased.
** \param addr Start address.
** \param len Length in bytes.
** \return BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
blt_bool FlashErase(blt_addr addr, blt_int32u len)
{
blt_addr erase_base_addr;
blt_int32u total_erase_len;
blt_int16u nr_of_erase_pages;
blt_int32u pageError = 0;
blt_int16u sector_idx;
FLASH_EraseInitTypeDef eraseInitStruct;
blt_bool result = BLT_TRUE;
/* validate the len parameter */
if ((len - 1) > (FLASH_END_ADDRESS - addr))
{
return BLT_FALSE;
}
/* determine the base address for the erase operation, by aligning to
* FLASH_ERASE_BLOCK_SIZE.
*/
erase_base_addr = (addr/FLASH_ERASE_BLOCK_SIZE)*FLASH_ERASE_BLOCK_SIZE;
/* make sure the addresses are within the flash device */
if ((erase_base_addr < FLASH_START_ADDRESS) || ((addr+len-1) > FLASH_END_ADDRESS))
{
return BLT_FALSE;
}
/* determine number of bytes to erase from base address */
total_erase_len = len + (addr - erase_base_addr);
/* determine the number of pages to erase */
nr_of_erase_pages = (blt_int16u)(total_erase_len / FLASH_ERASE_BLOCK_SIZE);
if ((total_erase_len % FLASH_ERASE_BLOCK_SIZE) > 0)
{
nr_of_erase_pages++;
}
/* prepare the erase initialization structure. */
eraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES;
eraseInitStruct.PageAddress = erase_base_addr;
eraseInitStruct.NbPages = FLASH_ERASE_BLOCK_SIZE/FLASH_PAGE_SIZE;
/* unlock the flash peripheral to enable the flash control register access. */
HAL_FLASH_Unlock();
/* loop through all pages to erase them one by one. the HAL supports erasing multiple
* pages with one function call, but then the watchdog can't be updated in between.
*/
for (sector_idx = 0; sector_idx < nr_of_erase_pages; sector_idx++)
{
/* keep the watchdog happy */
CopService();
/* erase the page. */
if (HAL_FLASHEx_Erase(&eraseInitStruct, (uint32_t *)&pageError) != HAL_OK)
{
/* flag error and stop erase operation */
result = BLT_FALSE;
break;
}
/* update the page base address for the next page. */
eraseInitStruct.PageAddress += FLASH_ERASE_BLOCK_SIZE;
}
/* lock the flash peripheral to disable the flash control register access. */
HAL_FLASH_Lock();
/* Give the result back to the caller. */
return result;
} /*** end of FlashErase ***/
/************************************************************************************//**
** \brief Writes a checksum of the user program to non-volatile memory. This is
** performed once the entire user program has been programmed. Through
** the checksum, the bootloader can check if the programming session
** was completed, which indicates that a valid user programming is
** present and can be started.
** \return BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
blt_bool FlashWriteChecksum(void)
{
blt_int32u signature_checksum = 0;
/* for the STM32L1 target we defined the checksum as the One's complement value of the
* sum of the first 7 exception addresses.
*
* Layout of the vector table:
* 0x08000000 Initial stack pointer
* 0x08000004 Reset Handler
* 0x08000008 NMI Handler
* 0x0800000C Hard Fault Handler
* 0x08000010 MPU Fault Handler
* 0x08000014 Bus Fault Handler
* 0x08000018 Usage Fault Handler
*
* signature_checksum = One's complement of (SUM(exception address values))
*
* the bootloader writes this 32-bit checksum value right after the vector table
* of the user program. note that this means one extra dummy entry must be added
* at the end of the user program's vector table to reserve storage space for the
* checksum.
*/
/* first check that the bootblock contains valid data. if not, this means the
* bootblock is not part of the reprogramming this time and therefore no
* new checksum needs to be written
*/
if (bootBlockInfo.base_addr == FLASH_INVALID_ADDRESS)
{
return BLT_TRUE;
}
#if (BOOT_FLASH_CRYPTO_HOOKS_ENABLE > 0)
/* perform decryption of the bootblock, before calculating the checksum and writing it
* to flash memory.
*/
if (FlashCryptoDecryptDataHook(bootBlockInfo.base_addr, bootBlockInfo.data,
FLASH_WRITE_BLOCK_SIZE) == BLT_FALSE)
{
return BLT_FALSE;
}
#endif
/* compute the checksum. note that the user program's vectors are not yet written
* to flash but are present in the bootblock data structure at this point.
*/
signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x00]));
signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x04]));
signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x08]));
signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x0C]));
signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x10]));
signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x14]));
signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x18]));
signature_checksum = ~signature_checksum; /* one's complement */
/* write the checksum */
return FlashWrite(flashLayout[0].sector_start+BOOT_FLASH_VECTOR_TABLE_CS_OFFSET,
sizeof(blt_addr), (blt_int8u *)&signature_checksum);
} /*** end of FlashWriteChecksum ***/
/************************************************************************************//**
** \brief Verifies the checksum, which indicates that a valid user program is
** present and can be started.
** \return BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
blt_bool FlashVerifyChecksum(void)
{
blt_int32u signature_checksum = 0;
blt_int32u signature_checksum_rom;
/* verify the checksum based on how it was written by CpuWriteChecksum() */
signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start));
signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x04));
signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x08));
signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x0C));
signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x10));
signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x14));
signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x18));
signature_checksum = ~signature_checksum; /* one's complement */
/* read the checksum value from flash that was written by the bootloader at the end
* of the last firmware update
*/
signature_checksum_rom = *((blt_int32u *)(flashLayout[0].sector_start+BOOT_FLASH_VECTOR_TABLE_CS_OFFSET));
/* verify that they are both the same */
if (signature_checksum == signature_checksum_rom)
{
/* checksum okay */
return BLT_TRUE;
}
/* checksum incorrect */
return BLT_FALSE;
} /*** end of FlashVerifyChecksum ***/
/************************************************************************************//**
** \brief Finalizes the flash driver operations. There could still be data in
** the currently active block that needs to be flashed.
** \return BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
blt_bool FlashDone(void)
{
/* check if there is still data waiting to be programmed in the boot block */
if (bootBlockInfo.base_addr != FLASH_INVALID_ADDRESS)
{
if (FlashWriteBlock(&bootBlockInfo) == BLT_FALSE)
{
return BLT_FALSE;
}
}
/* check if there is still data waiting to be programmed */
if (blockInfo.base_addr != FLASH_INVALID_ADDRESS)
{
if (FlashWriteBlock(&blockInfo) == BLT_FALSE)
{
return BLT_FALSE;
}
}
/* still here so all is okay */
return BLT_TRUE;
} /*** end of FlashDone ***/
/************************************************************************************//**
** \brief Obtains the base address of the flash memory available to the user program.
** This is basically the first address in the flashLayout table.
** \return Base address.
**
****************************************************************************************/
blt_addr FlashGetUserProgBaseAddress(void)
{
return flashLayout[0].sector_start;
} /*** end of FlashGetUserProgBaseAddress ***/
/************************************************************************************//**
** \brief Copies data currently in flash to the block->data and sets the
** base address.
** \param block Pointer to flash block info structure to operate on.
** \param address Base address of the block data.
** \return BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
static blt_bool FlashInitBlock(tFlashBlockInfo *block, blt_addr address)
{
/* check address alignment */
if ((address % FLASH_WRITE_BLOCK_SIZE) != 0)
{
return BLT_FALSE;
}
/* make sure that we are initializing a new block and not the same one */
if (block->base_addr == address)
{
/* block already initialized, so nothing to do */
return BLT_TRUE;
}
/* set the base address and copies the current data from flash */
block->base_addr = address;
CpuMemCopy((blt_addr)block->data, address, FLASH_WRITE_BLOCK_SIZE);
return BLT_TRUE;
} /*** end of FlashInitBlock ***/
/************************************************************************************//**
** \brief Switches blocks by programming the current one and initializing the
** next.
** \param block Pointer to flash block info structure to operate on.
** \param base_addr Base address of the next block.
** \return The pointer of the block info struct that is no being used, or a NULL
** pointer in case of error.
**
****************************************************************************************/
static tFlashBlockInfo *FlashSwitchBlock(tFlashBlockInfo *block, blt_addr base_addr)
{
/* check if a switch needs to be made away from the boot block. in this case the boot
* block shouldn't be written yet, because this is done at the end of the programming
* session by FlashDone(), this is right after the checksum was written.
*/
if (block == &bootBlockInfo)
{
/* switch from the boot block to the generic block info structure */
block = &blockInfo;
}
/* check if a switch back into the bootblock is needed. in this case the generic block
* doesn't need to be written here yet.
*/
else if (base_addr == flashLayout[0].sector_start)
{
/* switch from the generic block to the boot block info structure */
block = &bootBlockInfo;
base_addr = flashLayout[0].sector_start;
}
else
{
/* need to switch to a new block, so program the current one and init the next */
if (FlashWriteBlock(block) == BLT_FALSE)
{
return BLT_NULL;
}
}
/* initialize tne new block when necessary */
if (FlashInitBlock(block, base_addr) == BLT_FALSE)
{
return BLT_NULL;
}
/* still here to all is okay */
return block;
} /*** end of FlashSwitchBlock ***/
/************************************************************************************//**
** \brief Programming is done per block. This function adds data to the block
** that is currently collecting data to be written to flash. If the
** address is outside of the current block, the current block is written
** to flash an a new block is initialized.
** \param block Pointer to flash block info structure to operate on.
** \param address Flash destination address.
** \param data Pointer to the byte array with data.
** \param len Number of bytes to add to the block.
** \return BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
static blt_bool FlashAddToBlock(tFlashBlockInfo *block, blt_addr address,
blt_int8u *data, blt_int32u len)
{
blt_addr current_base_addr;
blt_int8u *dst;
blt_int8u *src;
/* determine the current base address */
current_base_addr = (address/FLASH_WRITE_BLOCK_SIZE)*FLASH_WRITE_BLOCK_SIZE;
/* make sure the blockInfo is not uninitialized */
if (block->base_addr == FLASH_INVALID_ADDRESS)
{
/* initialize the blockInfo struct for the current block */
if (FlashInitBlock(block, current_base_addr) == BLT_FALSE)
{
return BLT_FALSE;
}
}
/* check if the new data fits in the current block */
if (block->base_addr != current_base_addr)
{
/* need to switch to a new block, so program the current one and init the next */
block = FlashSwitchBlock(block, current_base_addr);
if (block == BLT_NULL)
{
return BLT_FALSE;
}
}
/* add the data to the current block, but check for block overflow */
dst = &(block->data[address - block->base_addr]);
src = data;
do
{
/* keep the watchdog happy */
CopService();
/* buffer overflow? */
if ((blt_addr)(dst-&(block->data[0])) >= FLASH_WRITE_BLOCK_SIZE)
{
/* need to switch to a new block, so program the current one and init the next */
block = FlashSwitchBlock(block, current_base_addr+FLASH_WRITE_BLOCK_SIZE);
if (block == BLT_NULL)
{
return BLT_FALSE;
}
/* reset destination pointer */
dst = &(block->data[0]);
}
/* write the data to the buffer */
*dst = *src;
/* update pointers */
dst++;
src++;
/* decrement byte counter */
len--;
}
while (len > 0);
/* still here so all is good */
return BLT_TRUE;
} /*** end of FlashAddToBlock ***/
/************************************************************************************//**
** \brief Programs FLASH_WRITE_BLOCK_SIZE bytes to flash from the block->data
** array.
** \param block Pointer to flash block info structure to operate on.
** \return BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
static blt_bool FlashWriteBlock(tFlashBlockInfo *block)
{
blt_bool result = BLT_TRUE;
blt_addr half_page_addr;
blt_int32u * half_page_data_ptr;
blt_int32u half_page_cnt;
blt_int32u const half_page_size = FLASH_PAGE_SIZE/2U;
blt_addr word_addr;
blt_int32u word_data;
blt_int32u word_cnt;
#if (BOOT_FLASH_CRYPTO_HOOKS_ENABLE > 0)
#if (BOOT_NVM_CHECKSUM_HOOKS_ENABLE == 0)
/* note that the bootblock is already decrypted in FlashWriteChecksum(), if the
* internal checksum mechanism is used. Therefore don't decrypt it again.
*/
if (block != &bootBlockInfo)
#endif
{
/* perform decryption of the program data before writing it to flash memory. */
if (FlashCryptoDecryptDataHook(block->base_addr, block->data,
FLASH_WRITE_BLOCK_SIZE) == BLT_FALSE)
{
return BLT_FALSE;
}
}
#endif
/* unlock the flash peripheral to enable the flash control register access. */
HAL_FLASH_Unlock();
/* sanity check. make sure the block's destination address is aligned to a half page
* size.
*/
ASSERT_RT((block->base_addr % half_page_size) == 0);
/* program the block in chunks of half a page (128 bytes) with the help of function
* HAL_FLASHEx_HalfPageProgram() that runs from RAM. Alternatively, you could use
* function HAL_FLASH_Program() that runs from flash and programs 4 bytes at a time.
* However, it turns out that this one runs really slow on the STM32L1.
*/
for (half_page_cnt=0; half_page_cnt<(FLASH_WRITE_BLOCK_SIZE/half_page_size); half_page_cnt++)
{
half_page_addr = block->base_addr + (half_page_cnt * half_page_size);
half_page_data_ptr = (blt_int32u *)(&block->data[half_page_cnt * half_page_size]);
/* keep the watchdog happy */
CopService();
/* program the half page */
if (HAL_FLASHEx_HalfPageProgram(half_page_addr, (uint32_t *)half_page_data_ptr) != HAL_OK)
{
result = BLT_FALSE;
break;
}
}
/* only continue with the data verification, if no error was detected so far. */
if (result == BLT_TRUE)
{
/* verify all words in the block one by one. */
for (word_cnt=0; word_cnt<(FLASH_WRITE_BLOCK_SIZE/sizeof(blt_int32u)); word_cnt++)
{
word_addr = block->base_addr + (word_cnt * sizeof(blt_int32u));
word_data = *(volatile blt_int32u *)(&block->data[word_cnt * sizeof(blt_int32u)]);
/* keep the watchdog happy. */
CopService();
/* verify that the written data is actually there. */
if (*(volatile blt_int32u *)word_addr != word_data)
{
result = BLT_FALSE;
break;
}
}
}
/* lock the flash peripheral to disable the flash control register access. */
HAL_FLASH_Lock();
/* Give the result back to the caller. */
return result;
} /*** end of FlashWriteBlock ***/
/*********************************** end of flash.c ************************************/
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