esp-idf/examples/storage/fatfsgen/main/CMakeLists.txt

idf_component_register(SRCS "fatfsgen_example_main.c"
                    INCLUDE_DIRS ".")

# Create a FATFS image from the contents of the 'fatfs_image' directory
# that fits the partition named 'storage'. FLASH_IN_PROJECT indicates that
# the generated image should be flashed when the entire project is flashed to
# the target with 'idf.py -p PORT flash'.
# If read-only mode is set (CONFIG_EXAMPLE_FATFS_MODE_READ_ONLY)
# the generated image will be raw without wear levelling support.
# Otherwise it will support wear levelling and thus enable read-write mounting of the image in the device.

if(CONFIG_FATFS_LFN_NONE)
    set(image ../fatfs_image)
else()
    set(image ../fatfs_long_name_image)
endif()

if(CONFIG_EXAMPLE_FATFS_MODE_READ_ONLY)
    if(CONFIG_EXAMPLE_FATFS_DEFAULT_DATETIME)
        fatfs_create_rawflash_image(storage ${image} FLASH_IN_PROJECT)
    else()
        fatfs_create_rawflash_image(storage ${image} FLASH_IN_PROJECT PRESERVE_TIME)
    endif()
else()
    if(CONFIG_EXAMPLE_FATFS_DEFAULT_DATETIME)
        fatfs_create_spiflash_image(storage ${image} FLASH_IN_PROJECT)
    else()
        fatfs_create_spiflash_image(storage ${image} FLASH_IN_PROJECT PRESERVE_TIME)
    endif()
endif()