How to integrate the Edge Impulse SDK into an ncs3.3.0 project to run EI models

[llly]

I have installed ncs3.3.0 and want to keep ncs unaffected. According to the document docs.nordicsemi.com/.../sdk_setup.html, I should choose to import the edge impulse SDK as an additional Zephyr module into the project. Then I use git clone --branch v2.0.0 github.com/.../sdk-edge-ai to pull this project onto my computer, and add set(EXTRA_ZEPHYR_MODULES "C:/ncs/ei_sdk/sdk-edge-ai") in the project's CMakeLists.txt to specify the path for edge AI, and add

CONFIG_CPP=y

CONFIG_REQUIRES_FULL_LIBCPP=y

CONFIG_STD_CPP11=y

CONFIG_EDGE_IMPULSE_SDK=y

CONFIG_EI_WRAPPER=n

CONFIG_FP16=n

CONFIG_EDGE_IMPULSE_PATH="F:/nrf54l15_app/ei_ml_test/ei_zephyr_eon_model.zip"

in prj.conf.

Finally I started compiling, but what I got was F:/nrf54l15_app/ei_ml_test_3.3.0/prj.conf:51: warning: attempt to assign the value 'y' to the undefined symbol EDGE_IMPULSE_SDK

F:/nrf54l15_app/ei_ml_test_3.3.0/prj.conf:54: warning: attempt to assign the value '"F:/nrf54l15_app/ei_ml_test/ei_zephyr_eon_model.zip"' to the undefined symbol EDGE_IMPULSE_ PATH
These two error messages.

What is the reason for this?

[Simon D-M]

Hi,

Can you please send me the whole output of a pristine build (including the build command)?

The thing I suspect the most here is some issue with multi-drive projects. Can you maybe try to move your project and the SDK on the same drive (for example both on the C:/ drive)?

Best regards,

Simon D-M

[llly]

Hi

This is the complete log output at compile time.

Building ei_ml_test_3.3.0
west build --build-dir f:/nrf54l15_app/ei_ml_test_3.3.0/build f:/nrf54l15_app/ei_ml_test_3.3.0 --pristine --board nrf52840dk/nrf52840 -- -DDEBUG_THREAD_INFO=Off -Dei_ml_test_3.3.0_DEBUG_THREAD_INFO=On

-- west build: generating a build system
Loading Zephyr module(s) (Zephyr base): sysbuild_default
-- Found Python3: C:/ncs/toolchains/936afb6332/opt/bin/python.exe (found suitable version "3.12.4", minimum required is "3.10") found components: Interpreter
-- Cache files will be written to: C:/ncs/v3.3.0/zephyr/.cache
-- Found west (found suitable version "1.5.0", minimum required is "0.14.0")
-- Board: nrf52840dk, qualifiers: nrf52840
Parsing f:/nrf54l15_app/ei_ml_test_3.3.0/Kconfig.sysbuild
Loaded configuration 'F:/nrf54l15_app/ei_ml_test_3.3.0/build/_sysbuild/empty.conf'
Merged configuration 'F:/nrf54l15_app/ei_ml_test_3.3.0/build/_sysbuild/empty.conf'
Configuration saved to 'F:/nrf54l15_app/ei_ml_test_3.3.0/build/zephyr/.config'
Kconfig header saved to 'F:/nrf54l15_app/ei_ml_test_3.3.0/build/_sysbuild/autoconf.h'
-- 
   **************************************
   * Running CMake for ei_ml_test_3.3.0 *
   **************************************
Loading Zephyr default modules (Zephyr base).
-- Application: F:/nrf54l15_app/ei_ml_test_3.3.0
-- CMake version: 4.2.1
-- Found Python3: C:/ncs/toolchains/936afb6332/opt/bin/python.exe (found suitable version "3.12.4", minimum required is "3.10") found components: Interpreter
-- Cache files will be written to: C:/ncs/v3.3.0/zephyr/.cache
-- Zephyr version: 4.3.99 (C:/ncs/v3.3.0/zephyr)
-- Found west (found suitable version "1.5.0", minimum required is "0.14.0")
-- Board: nrf52840dk, qualifiers: nrf52840
-- Found host-tools: zephyr 0.17.0 (C:/ncs/toolchains/936afb6332/opt/zephyr-sdk)
-- Found toolchain: zephyr 0.17.0 (C:/ncs/toolchains/936afb6332/opt/zephyr-sdk)
-- Found Dtc: C:/ncs/toolchains/936afb6332/opt/bin/dtc.exe (found suitable version "1.4.7", minimum required is "1.4.6")
-- Found BOARD.dts: C:/ncs/v3.3.0/zephyr/boards/nordic/nrf52840dk/nrf52840dk_nrf52840.dts
-- Generated zephyr.dts: F:/nrf54l15_app/ei_ml_test_3.3.0/build/ei_ml_test_3.3.0/zephyr/zephyr.dts
-- Generated pickled edt: F:/nrf54l15_app/ei_ml_test_3.3.0/build/ei_ml_test_3.3.0/zephyr/edt.pickle
-- Generated devicetree_generated.h: F:/nrf54l15_app/ei_ml_test_3.3.0/build/ei_ml_test_3.3.0/zephyr/include/generated/zephyr/devicetree_generated.h

F:/nrf54l15_app/ei_ml_test_3.3.0/prj.conf:51: warning: attempt to assign the value 'y' to the undefined symbol EDGE_IMPULSE_SDK
Parsing F:/nrf54l15_app/ei_ml_test_3.3.0/Kconfig
Loaded configuration 'C:/ncs/v3.3.0/zephyr/boards/nordic/nrf52840dk/nrf52840dk_nrf52840_defconfig'
Merged configuration 'F:/nrf54l15_app/ei_ml_test_3.3.0/prj.conf'
Merged configuration 'F:/nrf54l15_app/ei_ml_test_3.3.0/build/ei_ml_test_3.3.0/zephyr/.config.sysbuild'

F:/nrf54l15_app/ei_ml_test_3.3.0/prj.conf:54: warning: attempt to assign the value '"F:/nrf54l15_app/ei_ml_test_3.3.0/ei_zephyr_eon_model.zip"' to the undefined symbol EDGE_IMPULSE_PATH

error: Aborting due to Kconfig warnings

CMake Error at C:/ncs/v3.3.0/zephyr/cmake/modules/kconfig.cmake:409 (message):
  command failed with return code: 1
Call Stack (most recent call first):
  C:/ncs/v3.3.0/zephyr/cmake/modules/zephyr_default.cmake:129 (include)
  C:/ncs/v3.3.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:66 (include)
  C:/ncs/v3.3.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:92 (include_boilerplate)
  CMakeLists.txt:11 (find_package)


-- Configuring incomplete, errors occurred!
CMake Error at cmake/modules/sysbuild_extensions.cmake:740 (message):
  CMake configure failed for Zephyr project: ei_ml_test_3.3.0

  Location: F:/nrf54l15_app/ei_ml_test_3.3.0
Call Stack (most recent call first):
  cmake/modules/sysbuild_images.cmake:43 (ExternalZephyrProject_Cmake)
  cmake/modules/sysbuild_default.cmake:21 (include)
  C:/ncs/v3.3.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:75 (include)
  C:/ncs/v3.3.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:92 (include_boilerplate)
  C:/ncs/v3.3.0/zephyr/share/sysbuild-package/cmake/SysbuildConfig.cmake:8 (include)
  template/CMakeLists.txt:10 (find_package)


-- Configuring incomplete, errors occurred!
FATAL ERROR: command exited with status 1: 'C:\ncs\toolchains\936afb6332\opt\bin\cmake.EXE' -DWEST_PYTHON=C:/ncs/toolchains/936afb6332/opt/bin/python.exe '-Bf:\nrf54l15_app\ei_ml_test_3.3.0\build' -GNinja -DBOARD=nrf52840dk/nrf52840 -DDEBUG_THREAD_INFO=Off -Dei_ml_test_3.3.0_DEBUG_THREAD_INFO=On '-SC:\ncs\v3.3.0\zephyr\share\sysbuild'

 *  终端进程已终止，退出代码: 1。 
 *  终端将被任务重用，按任意键关闭。

This is the log after copying the project folder to the root directory of the C drive

Building ei_ml_test_3.3.0
west build --build-dir c:/ei_ml_test_3.3.0/build c:/ei_ml_test_3.3.0 --pristine --board nrf52840dk/nrf52840 -- -DCONFIG_DEBUG_THREAD_INFO=y

-- west build: generating a build system
Loading Zephyr module(s) (Zephyr base): sysbuild_default
-- Found Python3: C:/ncs/toolchains/936afb6332/opt/bin/python.exe (found suitable version "3.12.4", minimum required is "3.10") found components: Interpreter
-- Cache files will be written to: C:/ncs/v3.3.0/zephyr/.cache
-- Found west (found suitable version "1.5.0", minimum required is "0.14.0")
-- Board: nrf52840dk, qualifiers: nrf52840
Parsing c:/ei_ml_test_3.3.0/Kconfig.sysbuild
Loaded configuration 'C:/ei_ml_test_3.3.0/build/_sysbuild/empty.conf'
Merged configuration 'C:/ei_ml_test_3.3.0/build/_sysbuild/empty.conf'
Configuration saved to 'C:/ei_ml_test_3.3.0/build/zephyr/.config'
Kconfig header saved to 'C:/ei_ml_test_3.3.0/build/_sysbuild/autoconf.h'
-- 
   **************************************
   * Running CMake for ei_ml_test_3.3.0 *
   **************************************
Loading Zephyr default modules (Zephyr base).
-- Application: C:/ei_ml_test_3.3.0
-- CMake version: 4.2.1
-- Found Python3: C:/ncs/toolchains/936afb6332/opt/bin/python.exe (found suitable version "3.12.4", minimum required is "3.10") found components: Interpreter
-- Cache files will be written to: C:/ncs/v3.3.0/zephyr/.cache
-- Zephyr version: 4.3.99 (C:/ncs/v3.3.0/zephyr)
-- Found west (found suitable version "1.5.0", minimum required is "0.14.0")
-- Board: nrf52840dk, qualifiers: nrf52840
-- Found host-tools: zephyr 0.17.0 (C:/ncs/toolchains/936afb6332/opt/zephyr-sdk)
-- Found toolchain: zephyr 0.17.0 (C:/ncs/toolchains/936afb6332/opt/zephyr-sdk)
-- Found Dtc: C:/ncs/toolchains/936afb6332/opt/bin/dtc.exe (found suitable version "1.4.7", minimum required is "1.4.6")
-- Found BOARD.dts: C:/ncs/v3.3.0/zephyr/boards/nordic/nrf52840dk/nrf52840dk_nrf52840.dts
-- Generated zephyr.dts: C:/ei_ml_test_3.3.0/build/ei_ml_test_3.3.0/zephyr/zephyr.dts
-- Generated pickled edt: C:/ei_ml_test_3.3.0/build/ei_ml_test_3.3.0/zephyr/edt.pickle
-- Generated devicetree_generated.h: C:/ei_ml_test_3.3.0/build/ei_ml_test_3.3.0/zephyr/include/generated/zephyr/devicetree_generated.h

C:/ei_ml_test_3.3.0/prj.conf:51: warning: attempt to assign the value 'y' to the undefined symbol EDGE_IMPULSE_SDK

C:/ei_ml_test_3.3.0/prj.conf:54: warning: attempt to assign the value '"C:/ei_ml_test_3.3.0/ei_zephyr_eon_model.zip"' to the undefined symbol EDGE_IMPULSE_PATH
Parsing C:/ei_ml_test_3.3.0/Kconfig
Loaded configuration 'C:/ncs/v3.3.0/zephyr/boards/nordic/nrf52840dk/nrf52840dk_nrf52840_defconfig'
Merged configuration 'C:/ei_ml_test_3.3.0/prj.conf'
Merged configuration 'C:/ei_ml_test_3.3.0/build/ei_ml_test_3.3.0/zephyr/misc/generated/extra_kconfig_options.conf'
Merged configuration 'C:/ei_ml_test_3.3.0/build/ei_ml_test_3.3.0/zephyr/.config.sysbuild'

error: Aborting due to Kconfig warnings

CMake Error at C:/ncs/v3.3.0/zephyr/cmake/modules/kconfig.cmake:409 (message):
  command failed with return code: 1
Call Stack (most recent call first):
  C:/ncs/v3.3.0/zephyr/cmake/modules/zephyr_default.cmake:129 (include)
  C:/ncs/v3.3.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:66 (include)
  C:/ncs/v3.3.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:92 (include_boilerplate)
  CMakeLists.txt:11 (find_package)


-- Configuring incomplete, errors occurred!
CMake Error at cmake/modules/sysbuild_extensions.cmake:740 (message):
  CMake configure failed for Zephyr project: ei_ml_test_3.3.0

  Location: C:/ei_ml_test_3.3.0
Call Stack (most recent call first):
  cmake/modules/sysbuild_images.cmake:43 (ExternalZephyrProject_Cmake)
  cmake/modules/sysbuild_default.cmake:21 (include)
  C:/ncs/v3.3.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:75 (include)
  C:/ncs/v3.3.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:92 (include_boilerplate)
  C:/ncs/v3.3.0/zephyr/share/sysbuild-package/cmake/SysbuildConfig.cmake:8 (include)
  template/CMakeLists.txt:10 (find_package)


-- Configuring incomplete, errors occurred!
FATAL ERROR: command exited with status 1: 'C:\ncs\toolchains\936afb6332\opt\bin\cmake.EXE' -DWEST_PYTHON=C:/ncs/toolchains/936afb6332/opt/bin/python.exe '-Bc:\ei_ml_test_3.3.0\build' -GNinja -DBOARD=nrf52840dk/nrf52840 -DCONFIG_DEBUG_THREAD_INFO=y '-SC:\ncs\v3.3.0\zephyr\share\sysbuild'

 *  终端进程已终止，退出代码: 1。 
 *  终端将被任务重用，按任意键关闭。 

The problem has not improved

[Simon D-M]

Hi,

Sorry for the delay. I asked internally, and it seems like the doc is missing a step here.

For Edge Impulse projects, you also need to clone the Edge Impulse SDK.

git clone --branch v1.88.1 https://github.com/edgeimpulse/edge-impulse-sdk-zephyr

And then extend the EXTRA_ZEPHYR_MODULES with it.

set(EXTRA_ZEPHYR_MODULES "C:/ncs/ei_sdk/sdk-edge-ai;<path to cloned Edge Impulse SDK>")

Place the set(...) command just before find_package(Zephyr) in your CMakeLists.txt

Please tell me if that worked for you.

Best regards,

Simon D-M

[llly]

Hi

It's okay.

After adding set(EXTRA_ZEPHYR_MODULES "C:/ncs/edge-impulse-sdk-zephyr"), CONFIG_EDGE_IMPULSE_SDK did not report an error, but it still prompts that the macro CONFIG_EDGE_IMPULSE_PATH is missing

[llly]

Hi

Here's some good news, AI helped me solve this problem. However, the solution he generated didn't use CONFIG_EDGE_IMPULSE_PATH. He modified prj.conf and CMakeLists by referencing the ncs hello_ei example, so the documentation and the actual examples are inconsistent. Below is the complete prj.conf and CMakeLists.txt, which may be helpful to you.

#
# Copyright (c) 2018 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# Enable the UART driver
CONFIG_UART_ASYNC_API=y
CONFIG_NRFX_UARTE=y
CONFIG_SERIAL=y

CONFIG_GPIO=y

# Make sure printk is printing to the UART console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y

CONFIG_HEAP_MEM_POOL_SIZE=16384

CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="Nordic_UART_Service"
CONFIG_BT_MAX_CONN=1
CONFIG_BT_MAX_PAIRED=1

# Enable the NUS service
CONFIG_BT_NUS=y

# Enable bonding
CONFIG_BT_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y

# Enable DK LED and Buttons library
CONFIG_DK_LIBRARY=y

# Config logger
CONFIG_LOG=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_PRINTK=n

CONFIG_ASSERT=y

# Edge Impulse SDK configuration
CONFIG_CBPRINTF_FP_SUPPORT=y
CONFIG_FPU=y

# Increase stack sizes for ML inference
CONFIG_MAIN_STACK_SIZE=8192
CONFIG_BT_NUS_THREAD_STACK_SIZE=2048
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096

CONFIG_CPP=y
CONFIG_REQUIRES_FULL_LIBCPP=y
CONFIG_STD_CPP11=y
CONFIG_EDGE_IMPULSE_SDK=y
CONFIG_EI_WRAPPER=n
CONFIG_FP16=n
# CONFIG_EDGE_IMPULSE_PATH="F:/nrf54l15_app/ei_ml_test_3.3.0/ei_zephyr_eon_model.zip"

#
# Copyright (c) 2018 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#
cmake_minimum_required(VERSION 3.20.0)

set(EXTRA_ZEPHYR_MODULES "C:/ncs/edge-impulse-sdk-zephyr" "C:/ncs/sdk-edge-ai")

find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
project(ei_ml_test_3.3.0)

# NORDIC SDK APP START
target_sources(app PRIVATE
  src/main.c
)

# NORDIC SDK APP END

# ============================================================
# Edge Impulse model integration
# ============================================================
set(EDGE_IMPULSE_MODEL_PATH "${CMAKE_CURRENT_SOURCE_DIR}/ei_zephyr_eon_model.zip")

include(FetchContent)

FetchContent_Declare(
    edge_impulse_model
    URL ${EDGE_IMPULSE_MODEL_PATH}
)

FetchContent_MakeAvailable(edge_impulse_model)

# Add model include directories so generated headers can be found
zephyr_include_directories(${edge_impulse_model_SOURCE_DIR})

# Enable C linkage for calling Edge Impulse from C code
zephyr_compile_definitions(
  EI_C_LINKAGE=1
  EIDSP_SIGNAL_C_FN_POINTER=1
)

# Suppress warnings generated by Edge Impulse SDK
zephyr_compile_options(
  -Wno-double-promotion
  -Wno-unused
  -Wno-sign-compare
  -Wno-maybe-uninitialized
)

[Simon D-M]

Hi,

It is normal that "CONFIG_EDGE_IMPULSE_PATH" is not recognized as this is a custom Kconfig added from the sample "hell_ei". It is used in the "CMakeLists.txt" to specify a local file path of an archive containing the Edge Impulse library. So not exactly what you used it for.

If you want to implement "CONFIG_EDGE_IMPULSE_PATH", you can add this to your "Kconfig" file:

config EDGE_IMPULSE_PATH
	string "Edge Impulse library path"
	default 'ei_model_nrf_accel_sim_cpu_v55.zip'
	help
	  Specifies local file path of an archive containing Edge Impulse library.

and this to your "CMakeLists.txt":

# Expand any ${VARIABLES} in the path
string(CONFIGURE ${CONFIG_EDGE_IMPULSE_PATH} CONFIG_EDGE_IMPULSE_PATH)

# Convert relative paths to absolute paths
if(NOT IS_ABSOLUTE ${CONFIG_EDGE_IMPULSE_PATH})
  # Using application source directory as base directory for relative path
  set(CONFIG_EDGE_IMPULSE_PATH ${APPLICATION_SOURCE_DIR}/${CONFIG_EDGE_IMPULSE_PATH})
endif()

set(FETCH_CONTENT_NAME edge_impulse)

include(FetchContent)

FetchContent_Declare(
    ${FETCH_CONTENT_NAME}
    URL ${CONFIG_EDGE_IMPULSE_PATH}
)

FetchContent_MakeAvailable(${FETCH_CONTENT_NAME})

Best regards,

Simon D-M