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Bluetooth: Controller: Fix ticker ticks diff calculation 

Fix ticks difference calculation to determine delayed
prepare callback. Without the use of masking by
ticker_ticks_diff_get, the diff value can be higher than
the supported 24-bit value. i.e. ticker_ticks_now_get()
rolls over in 24-bit value, whereas ticks_at_event is
free running value of 32-bits.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2022-11-10 09:55:17 +05:30 committed by Carles Cufí
parent b49b11555c
commit 13c29940bf
1 changed files with 1 additions and 1 deletions
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subsys/bluetooth/controller/ll_sw/nordic/lll/lll.c
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@ -460,7 +460,7 @@ uint32_t lll_preempt_calc(struct ull_hdr *ull, uint8_t ticker_id,
uint32_t diff;
ticks_now = ticker_ticks_now_get();
diff = ticks_now - ticks_at_event;
diff = ticker_ticks_diff_get(ticks_now, ticks_at_event);
if (diff & BIT(HAL_TICKER_CNTR_MSBIT)) {
return 0;
}