Increased power consumption after start up

[Michal]

Hi,

I am trying to optimize my nrf52840 application for power consumption. If I run simple

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while(1) { WFE__());

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while(1) { WFE__());

loop using nrf5 SDK i get ~1.2mA. However with similiar code on Zephyr:

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for (;;) {

k_sleep(K_MSEC(1000));

}

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for (;;) {
    k_sleep(K_MSEC(1000));
}

I get ~1.7mA. I understand that Zephyr kernel configures some peripherals even before entering the main, but can you help me understand which in my case and how does it work exactly? Here is my prj.conf:

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#

# Copyright (c) 2018 Nordic Semiconductor

#

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

#

CONFIG_NCS_SAMPLES_DEFAULTS=y

CONFIG_BT_DEBUG_LOG=y

CONFIG_USE_SEGGER_RTT=y

CONFIG_RTT_CONSOLE=y

CONFIG_UART_CONSOLE=n

CONFIG_BT=y

CONFIG_BT_PERIPHERAL=y

CONFIG_BT_DEVICE_NAME="Sensor_board"

CONFIG_BT_BAS=y

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# I2C

CONFIG_I2C=y

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

CONFIG_BT_DEBUG_LOG=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y
CONFIG_UART_CONSOLE=n

CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="Sensor_board"
CONFIG_BT_BAS=y

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# I2C
CONFIG_I2C=y

# RTC
CONFIG_COUNTER=y
CONFIG_COUNTER_MICROCHIP_MCP7940N=y
CONFIG_COUNTER_INIT_PRIORITY=65

# LSM6DSO
CONFIG_LSM6DSO_TRIGGER_GLOBAL_THREAD=y

# Sensor
CONFIG_SENSOR=y
CONFIG_CBPRINTF_FP_SUPPORT=y

# ADC
CONFIG_ADC=y

# MAXIM
CONFIG_FUEL_GAUGE=y

CONFIG_GPIO=y

I am using NCS 2.7

Btw - I know >1mA is still too much , but this is a different issue I need to solve on hw side.

Best regards,

Michal