:orphan:

.. title:: BT_CTLR_LOW_LAT

.. option:: CONFIG_BT_CTLR_LOW_LAT

*Low latency non-negotiating event preemption*

Type: ``bool``

Help
====

.. code-block:: none

    Use low latency non-negotiating event preemption. This reduces
    Radio ISR latencies by the controller event scheduling framework.
    Consequently, this reduces on-air radio utilization due to redundant
    radio state switches.

Direct dependencies
===================

\ :option:`BT_LL_SW_SPLIT <CONFIG_BT_LL_SW_SPLIT>` && \ :option:`BT_CTLR <CONFIG_BT_CTLR>` && \ :option:`BT_HCI <CONFIG_BT_HCI>` && \ :option:`BT <CONFIG_BT>`

*(Includes any dependencies from ifs and menus.)*

Default
=======

- y if \ :option:`SOC_SERIES_NRF51X <CONFIG_SOC_SERIES_NRF51X>`

Symbols selected by this symbol
===============================

- \ :option:`BT_CTLR_LOW_LAT_ULL_DONE <CONFIG_BT_CTLR_LOW_LAT_ULL_DONE>`

Kconfig definition
==================



At ``<Zephyr Subsystem>/bluetooth/controller/Kconfig.ll_sw_split:313``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:34`` → ``<Zephyr Subsystem>/Kconfig:9`` → ``<Zephyr Subsystem>/bluetooth/Kconfig:307`` → ``<Zephyr Subsystem>/bluetooth/controller/Kconfig:633``

Menu path: (Top) → Sub Systems and OS Services → Bluetooth → Bluetooth Controller → Advanced features

.. code-block:: kconfig

    config BT_CTLR_LOW_LAT
    	bool "Low latency non-negotiating event preemption" if BT_CTLR_ADVANCED_FEATURES
    	default y if SOC_SERIES_NRF51X
    	select BT_CTLR_LOW_LAT_ULL_DONE
    	depends on BT_LL_SW_SPLIT && BT_CTLR && BT_HCI && BT
    	help
    	  Use low latency non-negotiating event preemption. This reduces
    	  Radio ISR latencies by the controller event scheduling framework.
    	  Consequently, this reduces on-air radio utilization due to redundant
    	  radio state switches.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*