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levelx/common/src/lx_nor_flash_open.c
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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** LevelX Component */
/** */
/** NOR Flash */
/** */
/**************************************************************************/
/**************************************************************************/
#define LX_SOURCE_CODE
/* Disable ThreadX error checking. */
#ifndef LX_DISABLE_ERROR_CHECKING
#define LX_DISABLE_ERROR_CHECKING
#endif
/* Include necessary system files. */
#include "lx_api.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _lx_nor_flash_open PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function opens a NOR flash instance and ensures the NOR flash */
/* is in a coherent state. */
/* */
/* INPUT */
/* */
/* nor_flash NOR flash instance */
/* name Name of NOR flash instance */
/* nor_driver_initialize Driver initialize */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* (nor_driver_initialize) Driver initialize */
/* _lx_nor_flash_driver_read Driver read */
/* _lx_nor_flash_driver_write Driver write */
/* (lx_nor_flash_driver_block_erased_verify) */
/* NOR flash verify block erased */
/* _lx_nor_flash_driver_block_erase Driver block erase */
/* _lx_nor_flash_logical_sector_find Find logical sector */
/* _lx_nor_flash_system_error System error handler */
/* tx_mutex_create Create thread-safe mutex */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), */
/* resulting in version 6.1 */
/* 11-09-2020 William E. Lamie Modified comment(s), */
/* fixed compiler warnings, */
/* resulting in version 6.1.2 */
/* 12-30-2020 William E. Lamie Modified comment(s), */
/* fixed compiler warnings, */
/* resulting in version 6.1.3 */
/* 06-02-2021 Bhupendra Naphade Modified comment(s), and */
/* updated product constants */
/* resulting in version 6.1.7 */
/* 03-08-2023 Xiuwen Cai Modified comment(s), */
/* added new driver interface, */
/* resulting in version 6.2.1 */
/* 10-31-2023 Xiuwen Cai Modified comment(s), */
/* added count for minimum */
/* erased blocks, added */
/* obsolete count cache, */
/* avoided clearing user */
/* extension in flash control */
/* block, */
/* resulting in version 6.3.0 */
/* */
/**************************************************************************/
UINT _lx_nor_flash_open(LX_NOR_FLASH *nor_flash, CHAR *name, UINT (*nor_driver_initialize)(LX_NOR_FLASH *))
{
ULONG sectors_per_block;
ULONG sector_map_words;
ULONG bit_map_words;
ULONG bit_map_mask;
ULONG total_header_words;
ULONG header_sectors;
ULONG *block_word_ptr;
ULONG block_word;
ULONG temp;
ULONG free_sectors;
ULONG used_sectors;
ULONG *new_map_entry;
ULONG *new_sector_address;
ULONG erased_count, min_erased_count, max_erased_count, temp_erased_count, min_erased_blocks;
ULONG j, k, l;
UINT status;
#ifdef LX_FREE_SECTOR_DATA_VERIFY
ULONG *sector_word_ptr;
ULONG sector_word;
#endif
LX_NOR_FLASH *tail_ptr;
LX_INTERRUPT_SAVE_AREA
LX_PARAMETER_NOT_USED(name);
/* Clear the NOR flash control block. User extension is not cleared. */
LX_MEMSET(nor_flash, 0, (ULONG)((UCHAR*)&(nor_flash -> lx_nor_flash_open_previous) - (UCHAR*)nor_flash) + sizeof(nor_flash -> lx_nor_flash_open_previous));
/* Call the flash driver's initialization function. */
(nor_driver_initialize)(nor_flash);
#ifndef LX_DIRECT_READ
/* Determine if the driver supplied a RAM buffer for reading the NOR sector if direct read is not
supported. */
if (nor_flash -> lx_nor_flash_sector_buffer == LX_NULL)
{
/* Return an error. */
return(LX_NO_MEMORY);
}
#endif
/* Setup the offset to the free bit map. */
nor_flash -> lx_nor_flash_block_free_bit_map_offset = sizeof(LX_NOR_FLASH_BLOCK_HEADER)/sizeof(ULONG);
/* Calculate the number of bits we need in the free physical sector bit map. Subtract 1 to account for the
flash block header itself. The case where multiple physical sectors are needed for certain sized flash
devices is handled below. */
sectors_per_block = (nor_flash -> lx_nor_flash_words_per_block / LX_NOR_SECTOR_SIZE) - 1;
/* Calculate the number of words required for the sector map array. */
sector_map_words = sectors_per_block;
/* Calculate the number of words we need for the free physical sector bit map. */
bit_map_words = (sectors_per_block + 31)/ 32;
/* Save the number of bit map words. */
nor_flash -> lx_nor_flash_block_bit_map_words = bit_map_words;
/* Setup the offset (in words) to the array of physical sector mapping. */
nor_flash -> lx_nor_flash_block_physical_sector_mapping_offset = nor_flash -> lx_nor_flash_block_free_bit_map_offset + bit_map_words;
/* Calculate the total number of words required for the flash block header. */
total_header_words = sizeof(LX_NOR_FLASH_BLOCK_HEADER)/sizeof(ULONG) + bit_map_words + sector_map_words;
/* Determine if more physical sectors are needed, which can happen on large devices. */
if (total_header_words <= LX_NOR_SECTOR_SIZE)
{
/* Round up to the size of 1 physical sector. */
total_header_words = LX_NOR_SECTOR_SIZE;
}
else
{
/* Otherwise calculate how many header sectors are necessary. */
header_sectors = (total_header_words-1)/LX_NOR_SECTOR_SIZE;
/* Round up to the next sector. */
header_sectors++;
/* Compute the total header words, rounding to the next sector. */
total_header_words = header_sectors * LX_NOR_SECTOR_SIZE;
/* Adjust the number of sectors per block. */
sectors_per_block = sectors_per_block - (header_sectors - 1);
}
/* Save the offset to the sector area. */
nor_flash -> lx_nor_flash_block_physical_sector_offset = total_header_words;
/* Save the physical sectors per block and total physical sectors. */
nor_flash -> lx_nor_flash_physical_sectors_per_block = sectors_per_block;
nor_flash -> lx_nor_flash_total_physical_sectors = nor_flash -> lx_nor_flash_total_blocks * sectors_per_block;
/* Build the free bit map mask, for the portion of the bit map that is less than 32 bits. */
if ((sectors_per_block % 32) != 0)
{
bit_map_mask = (ULONG)(1 << (sectors_per_block % 32));
bit_map_mask = bit_map_mask - 1;
}
else
{
/* Exactly 32 sectors for the bit map mask. */
bit_map_mask = LX_ALL_ONES;
}
/* Save the free bit map mask in the control block. */
nor_flash -> lx_nor_flash_block_bit_map_mask = bit_map_mask;
/* Setup default values for the max/min erased counts. */
min_erased_count = LX_ALL_ONES;
min_erased_blocks = 0;
max_erased_count = 0;
/* Setup the block word pointer to the first word of the first block, which is effectively the
flash base address. */
block_word_ptr = nor_flash -> lx_nor_flash_base_address;
/* Loop through the blocks to determine the minimum and maximum erase count. */
for (l = 0; l < nor_flash -> lx_nor_flash_total_blocks; l++)
{
/* Pickup the first word of the block. If the flash manager has executed before, this word contains the
erase count for the block. Otherwise, if the word is 0xFFFFFFFF, this flash block was either erased
or this is the first time it was used. */
#ifdef LX_DIRECT_READ
/* Read the word directly. */
block_word = *block_word_ptr;
#else
status = _lx_nor_flash_driver_read(nor_flash, block_word_ptr, &block_word, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
#endif
/* Is the block erased? */
if (((block_word & LX_BLOCK_ERASED) != LX_BLOCK_ERASED) && (block_word != LX_BLOCK_ERASE_STARTED))
{
/* No, valid block. Isolate the erased count. */
erased_count = (block_word & LX_BLOCK_ERASE_COUNT_MASK);
/* Is the erased count the minimum? */
if (erased_count == min_erased_count)
{
/* Yes, increment the minimum erased block count. */
min_erased_blocks++;
}
/* Is this the new minimum? */
if (erased_count < min_erased_count)
{
/* Yes, remember the new minimum. */
min_erased_count = erased_count;
/* Reset the minimum erased block count. */
min_erased_blocks = 1;
}
/* Is this the new maximum? */
if (erased_count > max_erased_count)
{
/* Yes, remember the new maximum. */
max_erased_count = erased_count;
}
}
/* Move to the next flash block. */
block_word_ptr = block_word_ptr + (nor_flash -> lx_nor_flash_words_per_block);
}
/* If we haven't found any erased counts, we can assume the flash is completely erased and needs to
be setup for the first time. */
if (min_erased_count == LX_ALL_ONES)
{
/* Indicate that this is the initial format. */
nor_flash -> lx_nor_flash_diagnostic_initial_format = LX_TRUE;
/* Setup the block word pointer to the first word of the first block, which is effectively the
flash base address. */
block_word_ptr = nor_flash -> lx_nor_flash_base_address;
/* Loop through the blocks to setup the flash the fist time. */
for (l = 0; l < nor_flash -> lx_nor_flash_total_blocks; l++)
{
/* Setup the free bit map that corresponds to the free physical sectors in this
block. Note that we only need to setup the portion of the free bit map that doesn't
have sectors associated with it. */
status = _lx_nor_flash_driver_write(nor_flash, block_word_ptr+(nor_flash -> lx_nor_flash_block_free_bit_map_offset + (bit_map_words-1)) , &bit_map_mask, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
/* Setup the initial erase count to 1. */
block_word = ((ULONG) 1);
/* Write the initial erase count for the block. */
status = _lx_nor_flash_driver_write(nor_flash, block_word_ptr, &block_word, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
/* Update the overall minimum and maximum erase count. */
nor_flash -> lx_nor_flash_minimum_erase_count = 1;
nor_flash -> lx_nor_flash_minimum_erased_blocks = nor_flash -> lx_nor_flash_total_blocks;
nor_flash -> lx_nor_flash_maximum_erase_count = 1;
/* Update the number of free physical sectors. */
nor_flash -> lx_nor_flash_free_physical_sectors = nor_flash -> lx_nor_flash_free_physical_sectors + sectors_per_block;
/* Move to the next flash block. */
block_word_ptr = block_word_ptr + (nor_flash -> lx_nor_flash_words_per_block);
}
}
else
{
/* At this point, we have a previously managed flash structure. This needs to be traversed to prepare for the
current flash operation. */
/* Default the flash free sector search to an invalid value. */
nor_flash -> lx_nor_flash_free_block_search = nor_flash -> lx_nor_flash_total_blocks;
/* Setup the block word pointer to the first word of the first block, which is effectively the
flash base address. */
block_word_ptr = nor_flash -> lx_nor_flash_base_address;
/* Loop through the blocks. */
for (l = 0; l < nor_flash -> lx_nor_flash_total_blocks; l++)
{
/* First, determine if this block has a valid erase count. */
#ifdef LX_DIRECT_READ
/* Read the word directly. */
block_word = *block_word_ptr;
#else
status = _lx_nor_flash_driver_read(nor_flash, block_word_ptr, &block_word, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
#endif
/* Is the block erased? */
if (((block_word & LX_BLOCK_ERASED) == LX_BLOCK_ERASED) || (block_word == LX_BLOCK_ERASE_STARTED))
{
/* This can happen if we were previously in the process of erasing the flash block and a
power interruption occurs. It should only occur once though. */
/* Is this the first time? */
if (nor_flash -> lx_nor_flash_diagnostic_erased_block)
{
/* No, this is a potential format error, since this should only happen once in a given
NOR flash format. */
_lx_nor_flash_system_error(nor_flash, LX_SYSTEM_INVALID_BLOCK);
/* Return an error. */
return(LX_ERROR);
}
/* Increment the erased block diagnostic. */
nor_flash -> lx_nor_flash_diagnostic_erased_block++;
/* Check to see if the block is erased. */
#ifdef LX_NOR_ENABLE_CONTROL_BLOCK_FOR_DRIVER_INTERFACE
status = (nor_flash -> lx_nor_flash_driver_block_erased_verify)(nor_flash, l);
#else
status = (nor_flash -> lx_nor_flash_driver_block_erased_verify)(l);
#endif
/* Is the block completely erased? */
if (status != LX_SUCCESS)
{
/* Is this the first time? */
if (nor_flash -> lx_nor_flash_diagnostic_re_erase_block)
{
/* No, this is a potential format error, since this should only happen once in a given
NOR flash format. */
_lx_nor_flash_system_error(nor_flash, LX_SYSTEM_INVALID_BLOCK);
/* Return an error. */
return(LX_ERROR);
}
/* Increment the erased block diagnostic. */
nor_flash -> lx_nor_flash_diagnostic_re_erase_block++;
/* No, the block is not fully erased, erase it again. */
status = _lx_nor_flash_driver_block_erase(nor_flash, l, max_erased_count);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
}
/* Setup the free bit map that corresponds to the free physical sectors in this
block. Note that we only need to setup the portion of the free bit map that doesn't
have sectors associated with it. */
status = _lx_nor_flash_driver_write(nor_flash, block_word_ptr+(nor_flash -> lx_nor_flash_block_free_bit_map_offset + (bit_map_words-1)) , &bit_map_mask, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
/* Write the initial erase count for the block with upper bit set. */
temp_erased_count = (max_erased_count | LX_BLOCK_ERASED);
status = _lx_nor_flash_driver_write(nor_flash, block_word_ptr, &temp_erased_count, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
/* Write the final initial erase count for the block. */
status = _lx_nor_flash_driver_write(nor_flash, block_word_ptr, &max_erased_count, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
/* Update the number of free physical sectors. */
nor_flash -> lx_nor_flash_free_physical_sectors = nor_flash -> lx_nor_flash_free_physical_sectors + sectors_per_block;
}
else
{
/* Calculate the number of free sectors from the free sector bit map. */
free_sectors = 0;
for (j = 0; j < bit_map_words; j++)
{
/* Read this word of the free sector bit map. */
#ifdef LX_DIRECT_READ
/* Read the word directly. */
block_word = *(block_word_ptr + nor_flash -> lx_nor_flash_block_free_bit_map_offset + j);
#else
status = _lx_nor_flash_driver_read(nor_flash, (block_word_ptr + nor_flash -> lx_nor_flash_block_free_bit_map_offset + j), &block_word, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
#endif
/* Count the number of set bits (free sectors). */
for (k = 0; k < 32; k++)
{
/* Is this sector free? */
if (block_word & 1)
{
/* Yes, this sector is free, increment the free sectors count. */
free_sectors++;
/* Determine if we need to update the search pointer. */
if (nor_flash -> lx_nor_flash_free_block_search == nor_flash -> lx_nor_flash_total_blocks)
{
/* Remember the block with free sectors. */
nor_flash -> lx_nor_flash_free_block_search = l;
}
}
/* Shift down the free sector. */
block_word = block_word >> 1;
}
}
/* Update the number of free physical sectors. */
nor_flash -> lx_nor_flash_free_physical_sectors = nor_flash -> lx_nor_flash_free_physical_sectors + free_sectors;
/* We need to now examine the mapping list. */
/* Calculate how many non-free sectors there are - this includes valid and obsolete sectors. */
used_sectors = sectors_per_block - free_sectors;
/* Now walk the list of logical-physical sector mapping. */
for (j = 0; j < sectors_per_block; j++)
{
/* Read this word of the sector mapping list. */
#ifdef LX_DIRECT_READ
/* Read the word directly. */
block_word = *(block_word_ptr + nor_flash -> lx_nor_flash_block_physical_sector_mapping_offset + j);
#else
status = _lx_nor_flash_driver_read(nor_flash, (block_word_ptr + nor_flash -> lx_nor_flash_block_physical_sector_mapping_offset + j), &block_word, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
#endif
/* Determine if we are expecting to find a used sector. */
if (used_sectors)
{
/* Yes, we expect this entry to be used. */
/* Is this sector in-use? */
if ((block_word & LX_NOR_LOGICAL_SECTOR_MASK) != LX_NOR_LOGICAL_SECTOR_MASK)
{
/* Determine if the valid bit is set and the superceded bit is clear. This indicates the block was
about to become obsolete. */
if ((block_word & LX_NOR_PHYSICAL_SECTOR_VALID) && ((block_word & LX_NOR_PHYSICAL_SECTOR_SUPERCEDED) == 0))
{
/* Increment the being obsoleted count. */
nor_flash -> lx_nor_flash_diagnostic_sector_being_obsoleted++;
/* Save the currently mapped physical sectors. */
temp = nor_flash -> lx_nor_flash_mapped_physical_sectors;
/* Indicate all the physical sectors are mapped for the purpose of this search. */
nor_flash -> lx_nor_flash_mapped_physical_sectors = nor_flash -> lx_nor_flash_total_physical_sectors;
/* Yes, this block was about to become obsolete. Perform a search for a logical sector entry that
has both of these bits set. */
_lx_nor_flash_logical_sector_find(nor_flash, (block_word & LX_NOR_LOGICAL_SECTOR_MASK), LX_TRUE, &new_map_entry, &new_sector_address);
/* Restore the number of mapped physical sectors. */
nor_flash -> lx_nor_flash_mapped_physical_sectors = temp;
/* Determine if the new logical sector entry is present. */
if (new_map_entry)
{
/* Yes, make the current entry obsolete in favor of the new entry. */
block_word = block_word & ~((ULONG) LX_NOR_PHYSICAL_SECTOR_VALID);
status = _lx_nor_flash_driver_write(nor_flash, (block_word_ptr + nor_flash -> lx_nor_flash_block_physical_sector_mapping_offset + j), &block_word, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
/* Is this the first time? */
if (nor_flash -> lx_nor_flash_diagnostic_sector_obsoleted)
{
/* No, this is a potential format error, since this should only happen once in a given
NOR flash format. */
_lx_nor_flash_system_error(nor_flash, LX_SYSTEM_INVALID_FORMAT);
/* Return an error. */
return(LX_ERROR);
}
/* Increment the obsoleted count. */
nor_flash -> lx_nor_flash_diagnostic_sector_obsoleted++;
}
}
}
/* Determine if the sector is free. */
else if (block_word == LX_NOR_PHYSICAL_SECTOR_FREE)
{
/* A free entry when there are still used sectors implies that the sector was allocated and a power interruption
took place prior to writing the new logical sector number into the list. */
/* Is this the first time? */
if (nor_flash -> lx_nor_flash_diagnostic_mapping_invalidated)
{
/* No, this is a potential format error, since this should only happen once in a given
NOR flash format. */
_lx_nor_flash_system_error(nor_flash, LX_SYSTEM_INVALID_FORMAT);
/* Return an error. */
return(LX_ERROR);
}
/* Write 0s out to this entry to invalidate the sector entry. */
block_word = 0;
status = _lx_nor_flash_driver_write(nor_flash, (block_word_ptr + nor_flash -> lx_nor_flash_block_physical_sector_mapping_offset + j), &block_word, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
/* Increment the number of mapping invalidates. */
nor_flash -> lx_nor_flash_diagnostic_mapping_invalidated++;
}
/* Yes, now determine if the sector is obsolete. */
if ((block_word & LX_NOR_PHYSICAL_SECTOR_VALID) == 0)
{
/* Increment the number of obsolete sectors. */
nor_flash -> lx_nor_flash_obsolete_physical_sectors++;
}
/* Determine if the mapping for this sector isn't yet valid. */
else if (block_word & LX_NOR_PHYSICAL_SECTOR_MAPPING_NOT_VALID)
{
/* Yes, a power interruption or reset occurred while the sector mapping entry was being written. */
/* Increment the number of obsolete sectors. */
nor_flash -> lx_nor_flash_obsolete_physical_sectors++;
/* Increment the interrupted mapping counter. */
nor_flash -> lx_nor_flash_diagnostic_mapping_write_interrupted++;
/* Invalidate this entry - clearing valid bit, superceded bit and logical sector. */
block_word = 0;
status = _lx_nor_flash_driver_write(nor_flash, (block_word_ptr + nor_flash -> lx_nor_flash_block_physical_sector_mapping_offset + j), &block_word, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
}
else
{
/* Increment the number of mapped physical sectors. */
nor_flash -> lx_nor_flash_mapped_physical_sectors++;
}
/* Decrease the number of used sectors. */
used_sectors--;
}
else
{
/* No more used sectors in this flash block. */
/* In this case the entry must be free or there is a serious NOR flash format error present. */
if (block_word != LX_NOR_PHYSICAL_SECTOR_FREE)
{
/* Increment the sector not free diagnostic. */
nor_flash -> lx_nor_flash_diagnostic_sector_not_free++;
/* NOR flash format. */
_lx_nor_flash_system_error(nor_flash, LX_SYSTEM_INVALID_FORMAT);
/* Write 0s out to this entry to invalidate the sector entry. */
block_word = 0;
status = _lx_nor_flash_driver_write(nor_flash, (block_word_ptr + nor_flash -> lx_nor_flash_block_physical_sector_mapping_offset + j), &block_word, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
}
#ifdef LX_FREE_SECTOR_DATA_VERIFY
/* Pickup address of the free sector data area. */
sector_word_ptr = block_word_ptr + (nor_flash -> lx_nor_flash_block_physical_sector_offset) + (j * LX_NOR_SECTOR_SIZE);
/* Determine if the data for this sector is free. */
for (k = 0; k < LX_NOR_SECTOR_SIZE; k++)
{
#ifdef LX_DIRECT_READ
/* Read the word directly. */
sector_word = *(sector_word_ptr);
#else
status = _lx_nor_flash_driver_read(nor_flash, (sector_word_ptr), &sector_word, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Return an error. */
return(LX_ERROR);
}
#endif
/* Determine if this word is not available. */
if (sector_word != LX_NOR_PHYSICAL_SECTOR_FREE)
{
/* Increment the sector data not free diagnostic. */
nor_flash -> lx_nor_flash_diagnostic_sector_data_not_free++;
/* This is a format error. */
_lx_nor_flash_system_error(nor_flash, LX_SYSTEM_INVALID_BLOCK);
/* Return an error. */
return(LX_ERROR);
}
/* Move to the next word in the sector. */
sector_word_ptr++;
}
#endif
}
}
}
/* Move to the next flash block. */
block_word_ptr = block_word_ptr + (nor_flash -> lx_nor_flash_words_per_block);
}
/* Update the overall minimum and maximum erase count. */
nor_flash -> lx_nor_flash_minimum_erase_count = min_erased_count;
nor_flash -> lx_nor_flash_minimum_erased_blocks = min_erased_blocks;
nor_flash -> lx_nor_flash_maximum_erase_count = max_erased_count;
/* Determine if we need to update the free sector search pointer. */
if (nor_flash -> lx_nor_flash_free_block_search == nor_flash -> lx_nor_flash_total_blocks)
{
/* Just start at the beginning. */
nor_flash -> lx_nor_flash_free_block_search = 0;
}
}
#ifdef LX_THREAD_SAFE_ENABLE
/* If the thread safe option is enabled, create a ThreadX mutex that will be used in all external APIs
in order to provide thread-safe operation. */
status = tx_mutex_create(&nor_flash -> lx_nor_flash_mutex, "NOR Flash Mutex", TX_NO_INHERIT);
/* Determine if the mutex creation encountered an error. */
if (status != LX_SUCCESS)
{
/* Call system error handler, since this should not happen. */
_lx_nor_flash_system_error(nor_flash, LX_SYSTEM_MUTEX_CREATE_FAILED);
/* Return error to caller. */
return(LX_ERROR);
}
#endif
/* Enable the sector mapping cache. */
nor_flash -> lx_nor_flash_sector_mapping_cache_enabled = LX_TRUE;
/* Initialize the last found block and sector markers. */
nor_flash -> lx_nor_flash_found_block_search = 0;
nor_flash -> lx_nor_flash_found_sector_search = 0;
/* Lockout interrupts. */
LX_DISABLE
/* At this point, the NOR flash has been opened successfully. Place the
NOR flash control block on the linked list of currently opened NOR flashes. */
/* Set the NOR flash state to open. */
nor_flash -> lx_nor_flash_state = LX_NOR_FLASH_OPENED;
/* Place the NOR flash control block on the list of opened NOR flashes. First,
check for an empty list. */
if (_lx_nor_flash_opened_count)
{
/* List is not empty - other NOR flashes are open. */
/* Pickup tail pointer. */
tail_ptr = _lx_nor_flash_opened_ptr -> lx_nor_flash_open_previous;
/* Place the new NOR flash control block in the list. */
_lx_nor_flash_opened_ptr -> lx_nor_flash_open_previous = nor_flash;
tail_ptr -> lx_nor_flash_open_next = nor_flash;
/* Setup this NOR flash's opened links. */
nor_flash -> lx_nor_flash_open_previous = tail_ptr;
nor_flash -> lx_nor_flash_open_next = _lx_nor_flash_opened_ptr;
}
else
{
/* The opened NOR flash list is empty. Add the NOR flash to empty list. */
_lx_nor_flash_opened_ptr = nor_flash;
nor_flash -> lx_nor_flash_open_next = nor_flash;
nor_flash -> lx_nor_flash_open_previous = nor_flash;
}
/* Increment the opened NOR flash counter. */
_lx_nor_flash_opened_count++;
/* Restore interrupts. */
LX_RESTORE
/* Return a successful completion. */
return(LX_SUCCESS);
}
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