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Bluetooth: controller: Fix first interval to be within +/-16us

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Due to the missing remainder support in the ticker_start
function for first interval, fix implementation so as to
round the first interval/offset during master connection
setup and connection update to within +/-16us.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2017-06-29 10:22:49 +02:00 • committed by Johan Hedberg
commit b56768b626
1 changed files with 14 additions and 0 deletions
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14
subsys/bluetooth/controller/ll_sw/ctrl.c
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@ -1176,6 +1176,13 @@ static inline u32_t isr_rx_scan(u8_t irkmatch_id, u8_t rssi_ready)
(conn_space_us - conn_offset_us) / 1250; (conn_space_us - conn_offset_us) / 1250;
} }
/* Workaround: Due to the missing remainder param in
* ticker_start function for first interval; add half a
* tick in microseconds so as to restrict the offset
* within the +/- 16us jitter for the offset.
*/
conn_space_us += (30517578125UL/1000000000UL) >> 1;
pdu_adv_tx->payload.connect_ind.lldata.interval = pdu_adv_tx->payload.connect_ind.lldata.interval =
_radio.scanner.conn_interval; _radio.scanner.conn_interval;
pdu_adv_tx->payload.connect_ind.lldata.latency = pdu_adv_tx->payload.connect_ind.lldata.latency =
@ -5672,6 +5679,13 @@ static inline u32_t event_conn_update_prep(struct connection *conn,
} else { } else {
ticks_win_offset = ticks_win_offset =
TICKER_US_TO_TICKS(conn->llcp.connection_update.win_offset_us); TICKER_US_TO_TICKS(conn->llcp.connection_update.win_offset_us);
/* Workaround: Due to the missing remainder param in
* ticker_start function for first interval; add half a
* tick in microseconds so as to restrict the offset
* within the +/- 16us jitter for the offset.
*/
ticks_win_offset += (30517578125UL/1000000000UL) >> 1;
} }
conn->conn_interval = conn->llcp.connection_update.interval; conn->conn_interval = conn->llcp.connection_update.interval;
conn->latency = conn->llcp.connection_update.latency; conn->latency = conn->llcp.connection_update.latency;