-
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¶
!BT_CTLR_TIFS_HW
&& (SOC_COMPATIBLE_NRF52X
|| SOC_SERIES_NRF53X
) && BT_LL_SW_SPLIT
&& BT_CTLR
&& BT_HCI
&& BT
(Includes any dependencies from ifs and menus.)
Defaults¶
No defaults. Implicitly defaults to n
.
Kconfig definition¶
At <Zephyr>/subsys/bluetooth/controller/Kconfig.ll_sw_split:337
Included via <Zephyr>/Kconfig:8
→ <Zephyr>/Kconfig.zephyr:34
→ <Zephyr>/subsys/Kconfig:9
→ <Zephyr>/subsys/bluetooth/Kconfig:240
→ <Zephyr>/subsys/bluetooth/controller/Kconfig:595
Menu path: (Top) → Sub Systems and OS Services → Bluetooth → Bluetooth Controller → Advanced features
config BT_CTLR_SW_SWITCH_SINGLE_TIMER bool "Single TIMER tIFS Trx SW switching" ifBT_CTLR_ADVANCED_FEATURES
depends on !BT_CTLR_TIFS_HW
&& (SOC_COMPATIBLE_NRF52X
||SOC_SERIES_NRF53X
) &&BT_LL_SW_SPLIT
&&BT_CTLR
&&BT_HCI
&&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.)