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# Copyright (c) 2016 Intel Corporation
# Copyright (c) 2020 Nordic Semiconductor ASA
# Copyright (c) 2023 Husqvarna AB
# SPDX-License-Identifier: Apache-2.0
config FAT_FILESYSTEM_ELM
bool "ELM FAT file system support"
depends on FILE_SYSTEM
select DISK_ACCESS
help
Use the ELM FAT File system implementation.
if FAT_FILESYSTEM_ELM
menu "ELM FAT file system settings"
visible if FAT_FILESYSTEM_ELM
config FS_FATFS_READ_ONLY
bool "Read-only support for all volumes"
help
Excludes write code from ELM FAT file system driver.
Select this when using FAT for read-only access to slightly
reduce code size.
This option affects FF_FS_READONLY defined in ffconf.h, inside
ELM FAT module.
config FS_FATFS_MKFS
bool
help
Adds code for creating disks with FAT file system.
This option affects FF_USE_MKFS defined in ffconf.h, inside
ELM FAT module.
config FS_FATFS_MOUNT_MKFS
bool "Allow formatting volume when mounting fails"
default y
select FS_FATFS_MKFS
help
This option adds code that allows fs_mount to attempt to format
a volume if no file system is found.
If formatting is not needed, disabling this flag will slightly
reduce application size.
Note: This option is destructive to data and will automatically
destroy your disk, if mount attempt fails. In case when your
disk can be detached from a device and recovered using other
system, it may be worth disabling this option.
When this option is disabled, disk needs to be FAT formatted
prior to connecting to a device, otherwise it will not be
mountable.
if FS_FATFS_MOUNT_MKFS
config FS_FATFS_MAX_ROOT_ENTRIES
int "Max number of entries in FAT FS root directory"
default 512
range 1 32768
help
Sets how many root directory entries will be allocated when
formatting new FAT system to a device.
Note that this should be multiply of FS_FATFS_MAX_SS / 32.
endif # FS_FATFS_MOUNT_MKFS
config FS_FATFS_EXFAT
bool "ExFAT support"
select FS_FATFS_LFN
help
Enable the exFAT format support for FatFs.
config FS_FATFS_NUM_FILES
int "Maximum number of opened files"
default 4
help
Affects how many file objects area available for parallel
use by FAT driver. Each object is of size sizeof(FIL), where
FIL is defined in ff.h of ELM FAT driver, and is pre-allocated
at compile-time.
This affects use of fs_open on FAT type mounted file systems.
config FS_FATFS_NUM_DIRS
int "Maximum number of opened directories"
default 4
help
Affects how many directory objects area available for parallel
use by FAT driver. Each object is of size sizeof(DIR), where
DIR is defined in ff.h of ELM FAT driver, and is pre-allocated
at compile-time.
This affects use of fs_opendir on FAT type mounted file systems.
config FS_FATFS_LFN
bool "Long filenames (LFN)"
help
Without long filenames enabled, file names are limited to 8.3 format.
This option increases working buffer size.
if FS_FATFS_LFN
choice FS_FATFS_LFN_MODE
prompt "LFN memory mode"
default FS_FATFS_LFN_MODE_BSS
config FS_FATFS_LFN_MODE_BSS
bool "Static buffer"
help
Enable LFN with static working buffer on the BSS. Always NOT thread-safe.
This option affects FF_USE_LFN defined in ffconf.h, inside
ELM FAT module, by setting its value to 1.
config FS_FATFS_LFN_MODE_STACK
bool "Stack buffer"
help
Enable LFN with dynamic working buffer on the STACK.
This option affects FF_USE_LFN defined in ffconf.h, inside
ELM FAT module, by setting its value to 2.
config FS_FATFS_LFN_MODE_HEAP
bool "Heap buffer"
depends on HEAP_MEM_POOL_SIZE > 0
help
Enable LFN with dynamic working buffer on the HEAP.
This option affects FF_USE_LFN defined in ffconf.h, inside
ELM FAT module, by setting its value to 3.
endchoice
config FS_FATFS_FF_USE_LFN
int
default 1 if FS_FATFS_LFN_MODE_BSS
default 2 if FS_FATFS_LFN_MODE_STACK
default 3 if FS_FATFS_LFN_MODE_HEAP
help
Translates FS_FATFS_LFN_MODE selection to FF_USE_LFN, defined in ffconf.h,
inside ELM FAT module.
config FS_FATFS_MAX_LFN
int "Max filename length"
range 12 255
default 255
help
The working buffer occupies (FS_FATFS_MAX_LFN + 1) * 2 bytes and
additional 608 bytes at exFAT enabled.
It should be set 255 to support full featured LFN operations.
endif # FS_FATFS_LFN
config FS_FATFS_CODEPAGE
int "FatFS code page (character set)"
default 437
help
Valid code page values:
437 - U.S.
720 - Arabic
737 - Greek
771 - KBL
775 - Baltic
850 - Latin 1
852 - Latin 2
855 - Cyrillic
857 - Turkish
860 - Portuguese
861 - Icelandic
862 - Hebrew
863 - Canadian French
864 - Arabic
865 - Nordic
866 - Russian
869 - Greek 2
932 - Japanese (DBCS)
936 - Simplified Chinese (DBCS)
949 - Korean (DBCS)
950 - Traditional Chinese (DBCS)
0 - Include all supported code pages
This option affects FF_CODE_PAGE defined in ffconf.h, inside
ELM FAT module.
config FS_FATFS_MAX_SS
int "Maximum supported sector size"
range 512 4096
default 512
help
Value set here will be used as maximum supported read/write
sector size, with 512 being minimum value.
Option affects write/read granularity and will increase
size of buffers used by FAT driver, which in practice affects
how much RAM each FATFS object, used with FAT mount point,
requires, which is this value plus some constant amount,
independent from this setting.
This will affect your compile time RAM allocation, when
mount point is defined as static/global life time variable,
or stack.
When this value is set to 512, all mount points will use
512 as sector size, all other values will cause FAT driver
to query device for sector size on mount.
This option affects FF_MAX_SS defined in ffconf.h, inside
ELM FAT module.
config FS_FATFS_MIN_SS
int "Minimum expected sector size"
range 512 FS_FATFS_MAX_SS
default 512
help
Specifies minimum sector size the FAT FS driver is expected to
support. Set this to FS_FATFS_MAX_FS when you have single
device with FAT FS or all connected devices use the same
sector size, to have slight reduction in code in FAT FS driver.
The reduction comes from the fact that FAT FS does not have to
query every connected device for sector size.
This option affects FF_MIN_SS defined in ffconf.h, inside
ELM FAT module.
config FS_FATFS_WINDOW_ALIGNMENT
int "Memory alignment for the member \"win\" in FATFS"
default 1
help
Specifies alignment, in bytes of FAT FS window buffer that is
used for device's read/write operations. MMC controllers may
require read/write buffer to start at memory address with
specific alignment, for example 16 or 512 bytes, the value
provided here is used as such alignment. Note that the window
buffer is internal element of FATFS structure, which means
that, in worst scenario, value provided here may cause FATFS
structure to have size of twice the value.
config FS_FATFS_REENTRANT
bool "FatFs reentrant"
depends on !FS_FATFS_LFN_MODE_BSS
help
Enable the FatFs re-entrancy (thread safe) option for file/directory
access for each volume. Will create a zephyr mutex object for each
FatFs volume and a FatFs system mutex.
endmenu
endif # FAT_FILESYSTEM_ELM