esp-idf/components/nvs_flash/project_include.cmake

# nvs_create_partition_image
#
# Create a NVS image of the specified CSV on the host during build and
# optionally have the created image flashed using `idf.py flash`
function(nvs_create_partition_image partition csv)
    set(options FLASH_IN_PROJECT)
    set(one VERSION)
    set(multi DEPENDS)
    cmake_parse_arguments(arg "${options}" "${one}" "${multi}" "${ARGN}")

    # Default to version 2
    if(NOT DEFINED arg_VERSION)
        set(arg_VERSION 2)
    endif()

    idf_build_get_property(idf_path IDF_PATH)
    set(nvs_partition_gen_py
        ${PYTHON}
        ${idf_path}/components/nvs_flash/nvs_partition_generator/nvs_partition_gen.py
       )

    get_filename_component(csv_full_path ${csv} ABSOLUTE)

    partition_table_get_partition_info(size "--partition-name ${partition}" "size")
    partition_table_get_partition_info(offset "--partition-name ${partition}" "offset")

    if("${size}" AND "${offset}")
        set(image_file ${CMAKE_BINARY_DIR}/${partition}.bin)

        add_custom_command(
            OUTPUT ${image_file}
            COMMAND ${nvs_partition_gen_py} generate --version ${arg_VERSION} ${csv_full_path} ${image_file} ${size}
            MAIN_DEPENDENCY ${csv_full_path}
            DEPENDS ${arg_DEPENDS}
            COMMENT "Generating NVS partition image for ${partition} from ${csv}"
           )

        add_custom_target(nvs_${partition}_bin ALL DEPENDS ${image_file})

        set_property(
            DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
            APPEND
            PROPERTY ADDITIONAL_CLEAN_FILES ${image_file}
           )

        idf_component_get_property(main_args esptool_py FLASH_ARGS)
        idf_component_get_property(sub_args esptool_py FLASH_SUB_ARGS)
        esptool_py_flash_target(${partition}-flash "${main_args}" "${sub_args}" ALWAYS_PLAINTEXT)
        esptool_py_flash_to_partition(${partition}-flash "${partition}" "${image_file}")

        add_dependencies(${partition}-flash nvs_${partition}_bin)

        if(arg_FLASH_IN_PROJECT)
            esptool_py_flash_to_partition(flash "${partition}" "${image_file}")
            add_dependencies(flash nvs_${partition}_bin)
        endif()
    else()
        set(message
            "Failed to create NVS image for partition '${partition}'. "
            "Check project configuration if using the correct partition table file."
           )
        fail_at_build_time(nvs_${partition}_bin "${message}")
    endif()
endfunction()