Power manager module

Use the power manager module to reduce the energy consumption of battery-powered devices. The module achieves this by switching to low power modes when the device is not used for a longer period of time. The power manager module is by default enabled, along with all of the required dependencies for every nRF Desktop device.

Module events

Source Module	Input Event	This Module	Output Event	Sink Module
Bluetooth LE advertising module	wake_up_event	power_manager
Buttons module
HID forward module
Motion module
Power manager module
Wheel module
USB state power manager module	force_power_down_event
Bluetooth state power manager module	keep_alive_event
HID state power manager module
Source modules for module_state_event	module_state_event
Bluetooth state power manager module	power_manager_restrict_event
Device Firmware Upgrade module
USB state power manager module
Power manager module	power_down_event
			power_down_event	Sink modules for power_down_event
			wake_up_event	Sink modules for wake_up_event

Note

See the Overview: Firmware architecture for more information about the event-based communication in the nRF Desktop application and about how to read this table.

Configuration

nRF Desktop uses the power manager module from the Common Application Framework (CAF). The CONFIG_DESKTOP_POWER_MANAGER Kconfig option selects CONFIG_CAF_POWER_MANAGER and aligns the default module configuration to the application requirements. The CONFIG_DESKTOP_POWER_MANAGER Kconfig option is implied by the CONFIG_DESKTOP_COMMON_MODULES Kconfig option. The CONFIG_DESKTOP_COMMON_MODULES option is enabled by default and is not user-assignable.

Additionally, the CONFIG_CAF_POWER_MANAGER_STAY_ON option is automatically enabled for nRF Desktop dongles (CONFIG_DESKTOP_DESKTOP_ROLE_HID_DONGLE).

Implementation details

See the CAF power manager module page for implementation details.