/**
* Stop advertising state machine
*
* Context: Link Layer task.
*
* @param advsm
*/
static void
ble_ll_adv_sm_stop(struct ble_ll_adv_sm *advsm)
{
os_sr_t sr;
if (advsm->enabled) {
/* Remove any scheduled advertising items */
ble_ll_sched_rmv_elem(&advsm->adv_sch);
/* Set to standby if we are no longer advertising */
OS_ENTER_CRITICAL(sr);
if (ble_ll_state_get() == BLE_LL_STATE_ADV) {
ble_phy_disable();
ble_ll_wfr_disable();
ble_ll_state_set(BLE_LL_STATE_STANDBY);
}
OS_EXIT_CRITICAL(sr);
os_eventq_remove(&g_ble_ll_data.ll_evq, &advsm->adv_txdone_ev);
/* If there is an event buf we need to free it */
if (advsm->conn_comp_ev) {
ble_hci_trans_buf_free(advsm->conn_comp_ev);
advsm->conn_comp_ev = NULL;
}
/* Disable advertising */
advsm->enabled = 0;
}
}
/**
* Stop advertising state machine
*
* Context: Link Layer task.
*
* @param advsm
*/
static void
ble_ll_adv_sm_stop(struct ble_ll_adv_sm *advsm)
{
os_sr_t sr;
if (advsm->enabled) {
/* Remove any scheduled advertising items */
ble_ll_sched_rmv_elem(&advsm->adv_sch);
os_eventq_remove(&g_ble_ll_data.ll_evq, &advsm->adv_txdone_ev);
/* Set to standby if we are no longer advertising */
OS_ENTER_CRITICAL(sr);
if (ble_ll_state_get() == BLE_LL_STATE_ADV) {
ble_ll_wfr_disable();
ble_ll_state_set(BLE_LL_STATE_STANDBY);
}
OS_EXIT_CRITICAL(sr);
/* Disable advertising */
advsm->enabled = 0;
}
}
/**
* Called when an advertising event is over.
*
* Context: Link Layer task.
*
* @param arg Pointer to advertising state machine.
*/
static void
ble_ll_adv_done(struct ble_ll_adv_sm *advsm)
{
uint8_t mask;
uint8_t final_adv_chan;
int32_t delta_t;
uint32_t itvl;
uint32_t start_time;
assert(advsm->enabled);
/* Remove the element from the schedule if it is still there. */
ble_ll_sched_rmv_elem(&advsm->adv_sch);
os_eventq_remove(&g_ble_ll_data.ll_evq, &advsm->adv_txdone_ev);
/*
* Check if we have ended our advertising event. If our last advertising
* packet was sent on the last channel, it means we are done with this
* event.
*/
if (advsm->adv_chanmask & 0x04) {
final_adv_chan = BLE_PHY_ADV_CHAN_START + 2;
} else if (advsm->adv_chanmask & 0x02) {
final_adv_chan = BLE_PHY_ADV_CHAN_START + 1;
} else {
final_adv_chan = BLE_PHY_ADV_CHAN_START;
}
if (advsm->adv_chan == final_adv_chan) {
/* Check if we need to resume scanning */
ble_ll_scan_chk_resume();
/* This event is over. Set adv channel to first one */
advsm->adv_chan = ble_ll_adv_first_chan(advsm);
/* Calculate start time of next advertising event */
itvl = advsm->adv_itvl_usecs;
if (advsm->adv_type != BLE_HCI_ADV_TYPE_ADV_DIRECT_IND_HD) {
itvl += rand() % (BLE_LL_ADV_DELAY_MS_MAX * 1000);
}
advsm->adv_event_start_time += os_cputime_usecs_to_ticks(itvl);
advsm->adv_pdu_start_time = advsm->adv_event_start_time;
/*
* The scheduled time better be in the future! If it is not, we will
* just keep advancing until we the time is in the future
*/
start_time = advsm->adv_pdu_start_time -
os_cputime_usecs_to_ticks(XCVR_TX_SCHED_DELAY_USECS);
delta_t = (int32_t)(start_time - os_cputime_get32());
if (delta_t < 0) {
/* Calculate start time of next advertising event */
while (delta_t < 0) {
itvl = advsm->adv_itvl_usecs;
if (advsm->adv_type != BLE_HCI_ADV_TYPE_ADV_DIRECT_IND_HD) {
itvl += rand() % (BLE_LL_ADV_DELAY_MS_MAX * 1000);
}
itvl = os_cputime_usecs_to_ticks(itvl);
advsm->adv_event_start_time += itvl;
advsm->adv_pdu_start_time = advsm->adv_event_start_time;
delta_t += (int32_t)itvl;
}
}
} else {
/*
* Move to next advertising channel. If not in the mask, just
* increment by 1. We can do this because we already checked if we
* just transmitted on the last advertising channel
*/
++advsm->adv_chan;
mask = 1 << (advsm->adv_chan - BLE_PHY_ADV_CHAN_START);
if ((mask & advsm->adv_chanmask) == 0) {
++advsm->adv_chan;
}
/*
* We will transmit right away. Set next pdu start time to now
* plus a xcvr start delay just so we dont count late adv starts
*/
advsm->adv_pdu_start_time = os_cputime_get32() +
os_cputime_usecs_to_ticks(XCVR_TX_SCHED_DELAY_USECS);
}
/*
* Stop high duty cycle directed advertising if we have been doing
* it for more than 1.28 seconds
*/
if (advsm->adv_type == BLE_HCI_ADV_TYPE_ADV_DIRECT_IND_HD) {
if (advsm->adv_pdu_start_time >= advsm->adv_dir_hd_end_time) {
/* Disable advertising */
advsm->enabled = 0;
ble_ll_conn_comp_event_send(NULL, BLE_ERR_DIR_ADV_TMO,
advsm->conn_comp_ev);
advsm->conn_comp_ev = NULL;
ble_ll_scan_chk_resume();
return;
}
}
/* We need to regenerate our RPA's if we have passed timeout */
#if (MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY) == 1)
ble_ll_adv_chk_rpa_timeout(advsm);
#endif
/* Schedule advertising transmit */
ble_ll_adv_set_sched(advsm, 0);
/*
* In the unlikely event we cant reschedule this, just post a done
* event and we will reschedule the next advertising event
*/
if (ble_ll_sched_adv_reschedule(&advsm->adv_sch)) {
os_eventq_put(&g_ble_ll_data.ll_evq, &advsm->adv_txdone_ev);
}
}
