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CONFIG_BT_CTLR_XTAL_ADVANCED
¶
Advanced event preparation
Type: bool
Help¶
Enables advanced event preparation offset ahead of radio tx/rx, taking into account predictive processing time requirements in preparation to the event, like control procedure handling and CPU execution speeds. Crystal oscillator is retained between closely spaced consecutive radio events to reduce the overall number of crystal settling current consumptions.
This feature maximizes radio utilization in an average role event timeslice when they are closely spaced by using a reduced offset between preparation and radio event.
By disabling this feature, the controller will use a constant offset between the preparation and radio event. The controller will toggle crystal oscillator between two closely spaced radio events leading to higher average current due to increased number of crystal settling current consumptions.
Direct dependencies¶
BT_CTLR_XTAL_ADVANCED_SUPPORT
&& BT_LL_SW_SPLIT
&& BT_CTLR
&& BT_HCI
&& BT
(Includes any dependencies from ifs and menus.)
Default¶
y
Kconfig definition¶
At <Zephyr>/subsys/bluetooth/controller/Kconfig.ll_sw_split:207
Included via <Zephyr>/Kconfig:8
→ <Zephyr>/Kconfig.zephyr:34
→ <Zephyr>/subsys/Kconfig:8
→ <Zephyr>/subsys/bluetooth/Kconfig:240
→ <Zephyr>/subsys/bluetooth/controller/Kconfig:554
Menu path: (Top) → Sub Systems and OS Services → Bluetooth → Bluetooth Controller → Advanced features
config BT_CTLR_XTAL_ADVANCED bool "Advanced event preparation" ifBT_CTLR_ADVANCED_FEATURES
default y depends onBT_CTLR_XTAL_ADVANCED_SUPPORT
&&BT_LL_SW_SPLIT
&&BT_CTLR
&&BT_HCI
&&BT
help Enables advanced event preparation offset ahead of radio tx/rx, taking into account predictive processing time requirements in preparation to the event, like control procedure handling and CPU execution speeds. Crystal oscillator is retained between closely spaced consecutive radio events to reduce the overall number of crystal settling current consumptions. This feature maximizes radio utilization in an average role event timeslice when they are closely spaced by using a reduced offset between preparation and radio event. By disabling this feature, the controller will use a constant offset between the preparation and radio event. The controller will toggle crystal oscillator between two closely spaced radio events leading to higher average current due to increased number of crystal settling current consumptions.
(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)