:orphan:

.. title:: BT_CTLR_SW_SWITCH_SINGLE_TIMER

.. option:: CONFIG_BT_CTLR_SW_SWITCH_SINGLE_TIMER

*Single TIMER tIFS Trx SW switching*

Type: ``bool``

Help
====

Implement the tIFS Trx SW switch with the same TIMER
instance, as the one used for BLE event timing. Requires
SW switching be enabled. Using a single TIMER:
(+) frees up one TIMER instance
(+) removes jitter for HCTO implementation
(-) introduces drifting to the absolute time inside BLE
events, that increases linearly with the number of
packets exchanged in the event
(-) makes it impossible to use most of the pre-programmed
PPI channels for the controller, resulting in 4 channels
less left for other uses

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

!\ :option:`BT_CTLR_TIFS_HW <CONFIG_BT_CTLR_TIFS_HW>` && (\ :option:`SOC_COMPATIBLE_NRF52X <CONFIG_SOC_COMPATIBLE_NRF52X>` || \ :option:`SOC_SERIES_NRF53X <CONFIG_SOC_SERIES_NRF53X>`) && \ :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.)*

Defaults
========

No defaults. Implicitly defaults to ``n``.

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

.. highlight:: kconfig

At ``subsys/bluetooth/controller/Kconfig.ll_sw_split:350``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:34`` → ``subsys/Kconfig:9`` → ``subsys/bluetooth/Kconfig:240`` → ``subsys/bluetooth/controller/Kconfig:594``

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

.. parsed-literal::

    config BT_CTLR_SW_SWITCH_SINGLE_TIMER
    	bool "Single TIMER tIFS Trx SW switching" if \ :option:`BT_CTLR_ADVANCED_FEATURES <CONFIG_BT_CTLR_ADVANCED_FEATURES>`
    	depends on !\ :option:`BT_CTLR_TIFS_HW <CONFIG_BT_CTLR_TIFS_HW>` && (\ :option:`SOC_COMPATIBLE_NRF52X <CONFIG_SOC_COMPATIBLE_NRF52X>` || \ :option:`SOC_SERIES_NRF53X <CONFIG_SOC_SERIES_NRF53X>`) && \ :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>`
    	help
    	  Implement the tIFS Trx SW switch with the same TIMER
    	  instance, as the one used for BLE event timing. Requires
    	  SW switching be enabled. Using a single TIMER:
    	  (+) frees up one TIMER instance
    	  (+) removes jitter for HCTO implementation
    	  (-) introduces drifting to the absolute time inside BLE
    	  events, that increases linearly with the number of
    	  packets exchanged in the event
    	  (-) makes it impossible to use most of the pre-programmed
    	  PPI channels for the controller, resulting in 4 channels
    	  less left for other uses

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