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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 && BT_CTLR && BT_HCI && BT
(Includes any dependencies from if’s and menus.)
Defaults¶
No defaults. Implicitly defaults to n.
Kconfig definition¶
At subsys/bluetooth/controller/Kconfig:532
Included via Kconfig:10 → Kconfig.zephyr:39 → subsys/Kconfig:8 → subsys/bluetooth/Kconfig:145
Menu path: (top menu) → Bluetooth → Advanced features
config BT_CTLR_SW_SWITCH_SINGLE_TIMER
bool
prompt "Single TIMER tIFS Trx SW switching" if !BT_CTLR_TIFS_HW && SOC_COMPATIBLE_NRF52X && BT_CTLR && BT_HCI && BT && BT_CTLR_ADVANCED_FEATURES
depends on !BT_CTLR_TIFS_HW && SOC_COMPATIBLE_NRF52X && 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
(Definitions include propagated dependencies, including from if’s and menus.)