| /* |
| * Copyright (c) 2018-2019 Nordic Semiconductor ASA |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define EVENT_OVERHEAD_XTAL_US 1500 |
| #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 |
| |
| /* 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 733 /* 24 RTC ticks */ |
| #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 /* 14 RTC ticks */ |
| #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 /* 9 RTC ticks */ |
| #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 /* 9 RTC ticks */ |
| #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 40 |
| |
| /* 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 |
| * clock. |
| */ |
| #define EVENT_TICKER_RES_MARGIN_US 32 |
| |
| #define EVENT_RX_JITTER_US(phy) 16 /* Radio Rx timing uncertainty */ |
| #define EVENT_RX_TO_US(phy) ((((((phy)&0x03) + 4)<<3)/BIT((((phy)&0x3)>>1))) + \ |
| EVENT_RX_JITTER_US(phy)) |
| |
| /* Turnaround time between RX and TX is based on CPU execution speed. It also |
| * includes radio ramp up time. The value must meet hard deadline of `150 us` |
| * imposed by BT Core spec for inter frame spacing (IFS). To include CPUs with |
| * slow clock, the conservative approach was taken to use IFS value for all |
| * cases. |
| */ |
| #define EVENT_RX_TX_TURNAROUND(phy) 150 |
| |
| /* Sub-microsecond conversion macros. With current timer resolution of ~30 us |
| * per tick, conversion factor is 1, and macros map 1:1 between us_frac and us. |
| * On sub-microsecond tick resolution architectures, a number of bits may be |
| * used to represent fractions of a microsecond, to allow higher precision in |
| * window widening. |
| */ |
| #define EVENT_US_TO_US_FRAC(us) (us) |
| #define EVENT_US_FRAC_TO_US(us_frac) (us_frac) |
| #define EVENT_TICKS_TO_US_FRAC(ticks) HAL_TICKER_TICKS_TO_US(ticks) |
| #define EVENT_US_FRAC_TO_TICKS(us_frac) HAL_TICKER_US_TO_TICKS(us_frac) |
| #define EVENT_US_FRAC_TO_REMAINDER(us_frac) HAL_TICKER_REMAINDER(us_frac) |
| |
| /* Time needed to set up a CIS from ACL instant to prepare (incl. radio). Used |
| * for CIS_Offset_Min. |
| */ |
| #define EVENT_OVERHEAD_CIS_SETUP_US MAX(EVENT_OVERHEAD_START_US, 500U) |
