patrick/zephyr
1
0
Fork 0
Code Issues Pull requests Actions 8 Packages Projects Releases Wiki Activity

Bluetooth: Controller: EVENT_OVERHEAD_START_US for typical usecases

Browse source 
Tune the EVENT_OVERHEAD_START_US for typical usecases on
nRF52833 SoC using the central_gatt_write and
peripheral_gatt_write samples.

Manually run the samples for over 30 mins without any
assertions and use the actual profiled value that would
otherwise be printed on assertion.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2022-09-25 14:35:16 +05:30 committed by Carles Cufí
parent a3b0ade9c6
commit 236d0351e7
1 changed files with 35 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

36
subsys/bluetooth/controller/ll_sw/nordic/lll/lll_vendor.h
View file

@ -8,14 +8,48 @@
#define EVENT_OVERHEAD_PREEMPT_US 0 /* if <= min, then dynamic preempt */
#define EVENT_OVERHEAD_PREEMPT_MIN_US 0
#define EVENT_OVERHEAD_PREEMPT_MAX_US EVENT_OVERHEAD_XTAL_US
#define EVENT_OVERHEAD_START_US 750
/* Measurement based on drifting roles that can overlap leading to collision
* resolutions that consume CPU time between radio events.
* Value include max end, start and scheduling CPU usage times.
* Measurements based on central_gatt_write and peripheral_gatt_write sample on
* nRF52833 SoC.
*/
#if defined(CONFIG_BT_CTLR_ADV_EXT)
#if defined(CONFIG_BT_OBSERVER)
#if defined(CONFIG_BT_CTLR_PHY_CODED)
/* Active connection in peripheral role with extended scanning on 1M and Coded
* PHY, scheduling and receiving auxiliary PDUs.
*/
#define EVENT_OVERHEAD_START_US 458
#else /* !CONFIG_BT_CTLR_PHY_CODED */
/* Active connection in peripheral role with extended scanning on 1M only,
* scheduling and receiving auxiliary PDUs.
*/
#define EVENT_OVERHEAD_START_US 428
#endif /* !CONFIG_BT_CTLR_PHY_CODED */
#else /* !CONFIG_BT_OBSERVER */
/* Active connection in peripheral role with legacy scanning on 1M.
*/
#define EVENT_OVERHEAD_START_US 275
#endif /* !CONFIG_BT_OBSERVER */
#else /* !CONFIG_BT_CTLR_ADV_EXT */
/* Active connection in peripheral role with additional advertising state.
*/
#define EVENT_OVERHEAD_START_US 275
#endif /* !CONFIG_BT_CTLR_ADV_EXT */
/* Worst-case time margin needed after event end-time in the air
* (done/preempt race margin + power-down/chain delay)
*/
#define EVENT_OVERHEAD_END_US 100
/* Sleep Clock Accuracy */
#define EVENT_JITTER_US 16
/* Inter-Event Space (IES) */
#define EVENT_TIES_US 625
/* Ticker resolution margin
* Needed due to the lack of fine timing resolution in ticker_start
* and ticker_update. Set to 32 us, which is ~1 tick with 32768 Hz