HID state power manager module
The HID state power manager module is a minor module that prevents suspending the device when HID reports are exchanged with the host.
Module events
Source Module |
Input Event |
This Module |
Output Event |
Sink Module |
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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
The module is enabled by CONFIG_DESKTOP_HID_STATE_PM_ENABLE Kconfig option.
The option depends on CONFIG_CAF_POWER_MANAGER and it is enabled by default.
Implementation details
The module relies on hid_report_event to detect HID report exchange.
Note
In the nRF Desktop application, most of the HID reports are broadcasted as hid_report_event, but there are exceptions.
For example, the Configuration channel uses HID feature reports or HID output reports as transport and the configuration channel data is broadcasted using config_event in the application.
Hence, the HID state power manager module does not prevent suspending the device when the configuration channel is in use.