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Bluetooth: controller: Scanning with unreserved window

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Added a Kconfig option to enable scanner with unreserved
scan window when in continuous scan mode. This will permit
scanner to be always pre-empted by other roles, making it
the lowest in priority when it comes to using the radio.

Fixes #27414.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2020-09-07 13:54:30 +05:30 • committed by Carles Cufí
commit 61b6534727
2 changed files with 16 additions and 4 deletions
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8
subsys/bluetooth/controller/Kconfig.ll_sw_split
View file

@ -413,6 +413,14 @@ config BT_CTLR_SCAN_INDICATION
help
Generate events indicating on air scanner events.
config BT_CTLR_SCAN_UNRESERVED
bool "Unreserved scan window"
depends on BT_OBSERVER
default y if BT_MESH
help
Scanner will not use time space reservation for scan window when in
continuous scan mode.
config BT_MAYFLY_YIELD_AFTER_CALL
bool "Yield from mayfly thread after first call"
default y

12
subsys/bluetooth/controller/ll_sw/ull_scan.c
View file

@ -294,10 +294,14 @@ uint8_t ull_scan_enable(struct ll_scan_set *scan)
(lll->ticks_window +
HAL_TICKER_US_TO_TICKS(EVENT_OVERHEAD_START_US));
} else {
scan->evt.ticks_slot =
(ticks_interval -
HAL_TICKER_US_TO_TICKS(EVENT_OVERHEAD_XTAL_US));
lll->ticks_window = 0;
if (IS_ENABLED(CONFIG_BT_CTLR_SCAN_UNRESERVED)) {
scan->evt.ticks_slot = 0U;
} else {
scan->evt.ticks_slot = ticks_interval -
HAL_TICKER_US_TO_TICKS(EVENT_OVERHEAD_XTAL_US);
}
lll->ticks_window = 0U;
}
if (IS_ENABLED(CONFIG_BT_CTLR_LOW_LAT)) {