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Bluetooth: controller: nRF5: Back-to-Back Radio Tx interface
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Add Radio interface to perform back-to-back transmit of PDU
with a configurable inter frame spacing.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
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@cvinayak @carlescufi
cvinayak authored and carlescufi committed Apr 22, 2021
1 parent 377d168 commit a379196
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Showing 4 changed files with 96 additions and 16 deletions.
85 changes: 69 additions & 16 deletions subsys/bluetooth/controller/ll_sw/nordic/hal/nrf5/radio/radio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -489,28 +489,55 @@ void *radio_pkt_decrypt_get(void)
#endif

#if !defined(CONFIG_BT_CTLR_TIFS_HW)

#define SW_SWITCH_PREV_RX 0
#define SW_SWITCH_NEXT_RX 0
#define SW_SWITCH_PREV_TX 1
#define SW_SWITCH_NEXT_TX 1
#define SW_SWITCH_PREV_PHY_1M 0
#define SW_SWITCH_PREV_FLAGS_DONTCARE 0
#define SW_SWITCH_NEXT_FLAGS_DONTCARE 0

static uint8_t sw_tifs_toggle;

static void sw_switch(uint8_t dir, uint8_t phy_curr, uint8_t flags_curr, uint8_t phy_next,
uint8_t flags_next)
static inline void sw_switch(uint8_t dir_curr, uint8_t dir_next,
uint8_t phy_curr, uint8_t flags_curr,
uint8_t phy_next, uint8_t flags_next)
{
uint8_t ppi = HAL_SW_SWITCH_RADIO_ENABLE_PPI(sw_tifs_toggle);
uint8_t cc = SW_SWITCH_TIMER_EVTS_COMP(sw_tifs_toggle);
uint32_t delay;

hal_radio_sw_switch_setup(cc, ppi, sw_tifs_toggle);

if (dir) {
/* NOTE: As constants are passed to dir_curr and dir_next, the
* compiler should optimize out the redundant code path as
* this is an inline function.
*/
if (dir_next) {
/* TX */

/* Calculate delay with respect to current (RX) and next
* (TX) PHY. If RX PHY is LE Coded, assume S8 coding scheme.
/* Calculate delay with respect to current and next PHY.
*/
delay = HAL_RADIO_NS2US_ROUND(
hal_radio_tx_ready_delay_ns_get(phy_next, flags_next) +
hal_radio_rx_chain_delay_ns_get(phy_curr, 1));

hal_radio_txen_on_sw_switch(ppi);
if (dir_curr) {
delay = HAL_RADIO_NS2US_ROUND(
hal_radio_tx_ready_delay_ns_get(phy_next,
flags_next) +
hal_radio_tx_chain_delay_ns_get(phy_curr,
flags_curr));

hal_radio_b2b_txen_on_sw_switch(ppi);
} else {
/* If RX PHY is LE Coded, calculate for S8 coding.
* Assumption being, S8 has higher delay.
*/
delay = HAL_RADIO_NS2US_ROUND(
hal_radio_tx_ready_delay_ns_get(phy_next,
flags_next) +
hal_radio_rx_chain_delay_ns_get(phy_curr, 1));

hal_radio_txen_on_sw_switch(ppi);
}

#if defined(CONFIG_BT_CTLR_PHY_CODED)
#if defined(CONFIG_HAS_HW_NRF_RADIO_BLE_CODED)
Expand All @@ -520,7 +547,7 @@ static void sw_switch(uint8_t dir, uint8_t phy_curr, uint8_t flags_curr, uint8_t
HAL_SW_SWITCH_GROUP_TASK_DISABLE_PPI(
sw_tifs_toggle);

if (phy_curr & PHY_CODED) {
if (!dir_curr && (phy_curr & PHY_CODED)) {
/* Switching to TX after RX on LE Coded PHY. */

uint8_t cc_s2 =
Expand All @@ -544,7 +571,8 @@ static void sw_switch(uint8_t dir, uint8_t phy_curr, uint8_t flags_curr, uint8_t

hal_radio_sw_switch_coded_tx_config_set(ppi_en, ppi_dis,
cc_s2, sw_tifs_toggle);
} else {

} else if (!dir_curr) {
/* Switching to TX after RX on LE 1M/2M PHY */

hal_radio_sw_switch_coded_config_clear(ppi_en,
Expand Down Expand Up @@ -613,12 +641,19 @@ void radio_switch_complete_and_rx(uint8_t phy_rx)
#else /* !CONFIG_BT_CTLR_TIFS_HW */
NRF_RADIO->SHORTS = RADIO_SHORTS_READY_START_Msk |
RADIO_SHORTS_END_DISABLE_Msk;
sw_switch(0, 0, 0, phy_rx, 0);

/* NOTE: As Tx chain delays are negligible constant values (~1 us)
* across nRF5x radios, sw_switch assumes the 1M chain delay for
* calculations.
*/
sw_switch(SW_SWITCH_PREV_TX, SW_SWITCH_NEXT_RX,
SW_SWITCH_PREV_PHY_1M, SW_SWITCH_PREV_FLAGS_DONTCARE,
phy_rx, SW_SWITCH_NEXT_FLAGS_DONTCARE);
#endif /* !CONFIG_BT_CTLR_TIFS_HW */
}

void radio_switch_complete_and_tx(uint8_t phy_rx, uint8_t flags_rx, uint8_t phy_tx,
uint8_t flags_tx)
void radio_switch_complete_and_tx(uint8_t phy_rx, uint8_t flags_rx,
uint8_t phy_tx, uint8_t flags_tx)
{
#if defined(CONFIG_BT_CTLR_TIFS_HW)
NRF_RADIO->SHORTS = RADIO_SHORTS_READY_START_Msk |
Expand All @@ -627,7 +662,25 @@ void radio_switch_complete_and_tx(uint8_t phy_rx, uint8_t flags_rx, uint8_t phy_
#else /* !CONFIG_BT_CTLR_TIFS_HW */
NRF_RADIO->SHORTS = RADIO_SHORTS_READY_START_Msk |
RADIO_SHORTS_END_DISABLE_Msk;
sw_switch(1, phy_rx, flags_rx, phy_tx, flags_tx);

sw_switch(SW_SWITCH_PREV_RX, SW_SWITCH_NEXT_TX,
phy_rx, flags_rx, phy_tx, flags_tx);
#endif /* !CONFIG_BT_CTLR_TIFS_HW */
}

void radio_switch_complete_and_b2b_tx(uint8_t phy_curr, uint8_t flags_curr,
uint8_t phy_next, uint8_t flags_next)
{
#if defined(CONFIG_BT_CTLR_TIFS_HW)
NRF_RADIO->SHORTS = RADIO_SHORTS_READY_START_Msk |
RADIO_SHORTS_END_DISABLE_Msk |
RADIO_SHORTS_DISABLED_TXEN_Msk;
#else /* !CONFIG_BT_CTLR_TIFS_HW */
NRF_RADIO->SHORTS = RADIO_SHORTS_READY_START_Msk |
RADIO_SHORTS_END_DISABLE_Msk;

sw_switch(SW_SWITCH_PREV_TX, SW_SWITCH_NEXT_TX,
phy_curr, flags_curr, phy_next, flags_next);
#endif /* !CONFIG_BT_CTLR_TIFS_HW */
}

Expand Down
2 changes: 2 additions & 0 deletions subsys/bluetooth/controller/ll_sw/nordic/hal/nrf5/radio/radio.h
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,8 @@ void *radio_pkt_decrypt_get(void);
void radio_switch_complete_and_rx(uint8_t phy_rx);
void radio_switch_complete_and_tx(uint8_t phy_rx, uint8_t flags_rx, uint8_t phy_tx,
uint8_t flags_tx);
void radio_switch_complete_and_b2b_tx(uint8_t phy_curr, uint8_t flags_curr,
uint8_t phy_next, uint8_t flags_next);
void radio_switch_complete_and_disable(void);

void radio_rssi_measure(void);
Expand Down
15 changes: 15 additions & 0 deletions subsys/bluetooth/controller/ll_sw/nordic/hal/nrf5/radio/radio_nrf5_dppi.h
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Original file line number Diff line number Diff line change
Expand Up @@ -469,6 +469,21 @@ static inline void hal_radio_txen_on_sw_switch(uint8_t ppi)
nrf_radio_subscribe_set(NRF_RADIO, NRF_RADIO_TASK_TXEN, ppi);
}

static inline void hal_radio_b2b_txen_on_sw_switch(uint8_t ppi)
{
/* NOTE: Calling radio_tmr_start/radio_tmr_start_us/radio_tmr_start_now
* after the radio_switch_complete_and_b2b_tx() call would have
* changed the PPI channel to HAL_RADIO_ENABLE_ON_TICK_PPI as we
* cannot double buffer the subscribe buffer. Hence, lets have
* both DPPI channel enabled (other one was enabled by the DPPI
* group when the Radio End occurred) so that when both timer
* trigger one of the DPPI is correct in the radio tx
* subscription.
*/
nrf_radio_subscribe_set(NRF_RADIO, NRF_RADIO_TASK_TXEN, ppi);
nrf_dppi_channels_enable(NRF_DPPIC, BIT(ppi));
}

static inline void hal_radio_rxen_on_sw_switch(uint8_t ppi)
{
nrf_radio_subscribe_set(NRF_RADIO, NRF_RADIO_TASK_RXEN, ppi);
Expand Down
10 changes: 10 additions & 0 deletions subsys/bluetooth/controller/ll_sw/nordic/hal/nrf5/radio/radio_nrf5_ppi.h
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Original file line number Diff line number Diff line change
Expand Up @@ -479,6 +479,16 @@ static inline void hal_radio_txen_on_sw_switch(uint8_t ppi)
HAL_SW_SWITCH_RADIO_ENABLE_PPI_TASK_TX);
}

static inline void hal_radio_b2b_txen_on_sw_switch(uint8_t ppi)
{
/* NOTE: As independent PPI are used to trigger the Radio Tx task,
* double buffers implementation works for sw_switch using PPIs,
* simply reuse the hal_radio_txen_on_sw_switch() functon to set
* the next PPIs task to be Radio Tx enable.
*/
hal_radio_txen_on_sw_switch(ppi);
}

static inline void hal_radio_rxen_on_sw_switch(uint8_t ppi)
{
nrf_ppi_task_endpoint_setup(
Expand Down

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