nRF5340 Sleep power consumption in Matter over Thread light switch example with SED

[Pau R]

Hello,

I am currently doing my end of career project about the performance of Matter over Thread. I have a working scenario which implies a nRF52840 DK working as a light bulb and a nRF5340 as a light switch. I am measuring the consumption of the devices with an Agilent Power Analyzer and the results of the SED mode that the light switch matter example provides are not what I was expecting.

The current consumption in 3v is about 8.3 mA

I would like to know if it is possible to have a lower consumption for this specific case and if I could change or add some values to the Kconfig file in order to get lower values. I attach my current Kconfig file

#

# Copyright (c) 2022 Project CHIP Authors

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# www.apache.org/.../LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

#

mainmenu "Matter nRF Connect Light Switch Example Application"

config STATE_LEDS

bool "Use LEDs to indicate the device state"

default y

help

Use LEDs to render the current state of the device such as the progress of commissioning of

the device into a network or the factory reset initiation. Note that setting this option to

'n' does not disable the LED indicating the state of the simulated bolt.

# Sample configuration used for Thread networking

if NET_L2_OPENTHREAD

choice OPENTHREAD_NORDIC_LIBRARY_CONFIGURATION

default OPENTHREAD_NORDIC_LIBRARY_MTD

endchoice

choice OPENTHREAD_DEVICE_TYPE

default OPENTHREAD_MTD

endchoice

config CHIP_ENABLE_SLEEPY_END_DEVICE_SUPPORT

bool

default y

endif # NET_L2_OPENTHREAD

if MPSL_FEM

config OPENTHREAD_DEFAULT_TX_POWER

int "Set the default 802.15.4 output power (dBm) for device with FEM"

range -40 20

default -40

help

Use this setting to set the default Thread (802.15.4) output power for device that

uses FEM. This value has a unit in dBm and represents the Tx power at Antenna port of FEM device.

# override FEM GAIN to 20 dB as a default

# see subsys/mpsl/fem/Kconfig

# Leave MPSL_FEM_NRF21540_TX_GAIN_DB unchanged when OPENTHREAD_DEFAULT_TX_POWER=0

# to set the output power to a similar value as for nRF52840DK.

config MPSL_FEM_NRF21540_TX_GAIN_DB

default 20 if OPENTHREAD_DEFAULT_TX_POWER != 0

endif # MPSL_FEM

source "${ZEPHYR_BASE}/../modules/lib/matter/config/nrfconnect/chip-module/Kconfig.features"

source "${ZEPHYR_BASE}/../modules/lib/matter/config/nrfconnect/chip-module/Kconfig.defaults"

source "Kconfig.zephyr"

Finally this is my first post so please if any further information is required do not hesitate to ask me.

I am hopefully waiting for your recomendations.

Thanks in advance,

Pau

[Charlie]

Hi Pau,

Did you build with prj_release.conf? It has some configurations to disable RTT, log system and so on to save power for formal release products.

Best regards,

Charlie

[Pau R]

Hi Charlie,

I am running Toolchain Manager to execute nRF Connect SDK v2.1.1 with Visual Studio Code.

There is a prj_release.conf file indeed that I believe it is used when I build the project configuration with the nRF Connect extension from VSC.

I will try to apply the changes in the configuration file you are mentioning and hopefully this week I will go to the place where I can measure the current and tell you about the results.

May I ask what disabling the RTT does to the build, if it makes the scenario of light-bulb light-switch stop working or simply it reduces the response from the bulb. It may have nothing to do with what I just said so I would like to know surely.

I can also attach my current prj_release.conf without applying the changes just to have the logs.

• #

  # Copyright (c) 2022 Nordic Semiconductor ASA

  #

  # SPDX-License-Identifier: LicenseRef-Nordic-5-Clause

  #

  
  

  # Enable CHIP

  CONFIG_CHIP=y

  CONFIG_CHIP_PROJECT_CONFIG="src/chip_project_config.h"

  # 32773 == 0x8005 (example lighting-app)

  CONFIG_CHIP_DEVICE_PRODUCT_ID=32773

  CONFIG_STD_CPP14=y

  
  

  # Enable CHIP pairing automatically on application start.

  CONFIG_CHIP_ENABLE_PAIRING_AUTOSTART=y

  
  

  # Add support for LEDs and buttons on Nordic development kits

  CONFIG_DK_LIBRARY=y

  CONFIG_PWM=y

  
  

  # General networking settings

  CONFIG_NET_IF_MCAST_IPV6_ADDR_COUNT=14

  
  

  # OpenThread configs

  CONFIG_OPENTHREAD_NORDIC_LIBRARY_FTD=y

  
  

  # Bluetooth Low Energy configuration

  CONFIG_BT_DEVICE_NAME="MatterLight"

  
  

  # Enable system reset on fatal error

  CONFIG_RESET_ON_FATAL_ERROR=y

  
  

  # Stack size settings

  CONFIG_IEEE802154_NRF5_RX_STACK_SIZE=1024

  
  

  # Disable all debug features

  CONFIG_SHELL=n

  CONFIG_OPENTHREAD_SHELL=n

  CONFIG_CONSOLE=n

  CONFIG_UART_CONSOLE=n

  CONFIG_SERIAL=n

  CONFIG_LOG=n

  CONFIG_LOG_MODE_MINIMAL=n

  CONFIG_ASSERT_VERBOSE=n

  CONFIG_ASSERT_NO_FILE_INFO=y

  CONFIG_PRINTK=n

  CONFIG_PRINTK_SYNC=n

  CONFIG_THREAD_NAME=n

Thank you for your time,

Pau

[Pau R]

• The actual light switch prj_release.conf, I copied the ligth bulb above by error
  
  
  #

  # Copyright (c) 2021 Nordic Semiconductor ASA

  #

  # SPDX-License-Identifier: LicenseRef-Nordic-5-Clause

  #

  
  

  # Enable CHIP

  CONFIG_CHIP=y

  CONFIG_CHIP_PROJECT_CONFIG="src/chip_project_config.h"

  # 32772 == 0x8004 (example light-switch-app)

  CONFIG_CHIP_DEVICE_PRODUCT_ID=32772

  CONFIG_STD_CPP14=y

  
  

  # Add support for LEDs and buttons on Nordic development kits

  CONFIG_DK_LIBRARY=y

  
  

  # General networking settings

  CONFIG_NET_IF_MCAST_IPV6_ADDR_COUNT=14

  
  

  # Bluetooth Low Energy configuration

  CONFIG_BT_DEVICE_NAME="MatterSwitch"

  
  

  # Enable system reset on fatal error

  CONFIG_RESET_ON_FATAL_ERROR=y

  
  

  # Suspend devices when the CPU goes into sleep

  CONFIG_PM_DEVICE=y

  
  

  # Disable all debug features

  CONFIG_SHELL=n

  CONFIG_OPENTHREAD_SHELL=n

  CONFIG_CONSOLE=n

  CONFIG_UART_CONSOLE=n

  CONFIG_SERIAL=n

  CONFIG_LOG=n

  CONFIG_LOG_MODE_MINIMAL=n

  CONFIG_ASSERT_VERBOSE=n

  CONFIG_ASSERT_NO_FILE_INFO=y

  CONFIG_PRINTK=n

  CONFIG_PRINTK_SYNC=n

  CONFIG_THREAD_NAME=n