/**
* Called from interrupt context when the transmit ends
*
*/
static void
ble_phy_tx_end_isr(void)
{
uint8_t was_encrypted;
uint8_t transition;
uint8_t txlen;
uint32_t wfr_time;
uint32_t txstart;
/*
* Read captured tx start time. This is not the actual transmit start
* time but it is the time at which the address event occurred
* (after transmission of access address)
*/
txstart = NRF_TIMER0->CC[1];
/* If this transmission was encrypted we need to remember it */
was_encrypted = g_ble_phy_data.phy_encrypted;
/* Better be in TX state! */
assert(g_ble_phy_data.phy_state == BLE_PHY_STATE_TX);
/* Log the event */
ble_ll_log(BLE_LL_LOG_ID_PHY_TXEND, g_ble_phy_data.phy_tx_pyld_len,
was_encrypted, txstart);
/* Clear events and clear interrupt on disabled event */
NRF_RADIO->EVENTS_DISABLED = 0;
NRF_RADIO->INTENCLR = RADIO_INTENCLR_DISABLED_Msk;
NRF_RADIO->EVENTS_END = 0;
wfr_time = NRF_RADIO->SHORTS;
#if (MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION) == 1)
/*
* XXX: not sure what to do. We had a HW error during transmission.
* For now I just count a stat but continue on like all is good.
*/
if (was_encrypted) {
if (NRF_CCM->EVENTS_ERROR) {
STATS_INC(ble_phy_stats, tx_hw_err);
NRF_CCM->EVENTS_ERROR = 0;
}
}
#endif
/* Call transmit end callback */
if (g_ble_phy_data.txend_cb) {
g_ble_phy_data.txend_cb(g_ble_phy_data.txend_arg);
}
transition = g_ble_phy_data.phy_transition;
if (transition == BLE_PHY_TRANSITION_TX_RX) {
/* Packet pointer needs to be reset. */
ble_phy_rx_xcvr_setup();
/*
* Enable the wait for response timer. Note that cc #1 on
* timer 0 contains the transmit start time
*/
txlen = g_ble_phy_data.phy_tx_pyld_len;
if (txlen && was_encrypted) {
txlen += BLE_LL_DATA_MIC_LEN;
}
wfr_time = BLE_LL_WFR_USECS - BLE_TX_LEN_USECS_M(NRF_RX_START_OFFSET);
wfr_time += BLE_TX_DUR_USECS_M(txlen);
wfr_time = os_cputime_usecs_to_ticks(wfr_time);
ble_ll_wfr_enable(txstart + wfr_time);
} else {
/* Disable automatic TXEN */
NRF_PPI->CHENCLR = PPI_CHEN_CH20_Msk;
assert(transition == BLE_PHY_TRANSITION_NONE);
}
}
static void
ble_phy_isr(void)
{
int rc;
uint8_t transition;
uint8_t crcok;
uint32_t irq_en;
uint32_t state;
uint32_t wfr_time;
struct os_mbuf *rxpdu;
struct ble_mbuf_hdr *ble_hdr;
/* Read irq register to determine which interrupts are enabled */
irq_en = NRF_RADIO->INTENCLR;
/* Check for disabled event. This only happens for transmits now */
if ((irq_en & RADIO_INTENCLR_DISABLED_Msk) && NRF_RADIO->EVENTS_DISABLED) {
/* Better be in TX state! */
assert(g_ble_phy_data.phy_state == BLE_PHY_STATE_TX);
ble_ll_log(BLE_LL_LOG_ID_PHY_TXEND, g_ble_phy_txrx_buf[1], 0,
NRF_TIMER0->CC[2]);
/* Clear events and clear interrupt on disabled event */
NRF_RADIO->EVENTS_DISABLED = 0;
NRF_RADIO->INTENCLR = RADIO_INTENCLR_DISABLED_Msk;
NRF_RADIO->EVENTS_END = 0;
state = NRF_RADIO->SHORTS;
transition = g_ble_phy_data.phy_transition;
if (transition == BLE_PHY_TRANSITION_TX_RX) {
/* Clear the rx started flag */
g_ble_phy_data.phy_rx_started = 0;
/* Packet pointer needs to be reset. */
if (g_ble_phy_data.rxpdu != NULL) {
NRF_RADIO->PACKETPTR = (uint32_t)g_ble_phy_data.rxpdu->om_data;
/* I want to know when 1st byte received (after address) */
NRF_RADIO->BCC = 8; /* in bits */
NRF_RADIO->EVENTS_ADDRESS = 0;
NRF_RADIO->EVENTS_DEVMATCH = 0;
NRF_RADIO->EVENTS_BCMATCH = 0;
NRF_RADIO->EVENTS_RSSIEND = 0;
NRF_RADIO->SHORTS = RADIO_SHORTS_END_DISABLE_Msk |
RADIO_SHORTS_READY_START_Msk |
RADIO_SHORTS_ADDRESS_BCSTART_Msk |
RADIO_SHORTS_ADDRESS_RSSISTART_Msk |
RADIO_SHORTS_DISABLED_RSSISTOP_Msk;
NRF_RADIO->INTENSET = RADIO_INTENSET_ADDRESS_Msk;
g_ble_phy_data.phy_state = BLE_PHY_STATE_RX;
} else {
/* Disable the phy */
++g_ble_phy_stats.no_bufs;
ble_phy_disable();
}
/*
* Enable the wait for response timer. Note that cc #2 on
* timer 0 contains the transmit end time
*/
wfr_time = NRF_TIMER0->CC[2];
wfr_time += cputime_usecs_to_ticks(BLE_LL_WFR_USECS);
ble_ll_wfr_enable(wfr_time);
} else {
/* Better not be going from rx to tx! */
assert(transition == BLE_PHY_TRANSITION_NONE);
}
/* Call transmit end callback */
if (g_ble_phy_data.txend_cb) {
g_ble_phy_data.txend_cb(g_ble_phy_data.txend_arg);
}
}
/* We get this if we have started to receive a frame */
if ((irq_en & RADIO_INTENCLR_ADDRESS_Msk) && NRF_RADIO->EVENTS_ADDRESS) {
/* Clear events and clear interrupt */
NRF_RADIO->EVENTS_ADDRESS = 0;
NRF_RADIO->INTENCLR = RADIO_INTENCLR_ADDRESS_Msk;
assert(g_ble_phy_data.rxpdu != NULL);
/* Wait to get 1st byte of frame */
while (1) {
state = NRF_RADIO->STATE;
if (NRF_RADIO->EVENTS_BCMATCH != 0) {
break;
}
/*
* If state is disabled, we should have the BCMATCH. If not,
* something is wrong!
*/
if (state == RADIO_STATE_STATE_Disabled) {
NRF_RADIO->INTENCLR = NRF52_RADIO_IRQ_MASK_ALL;
NRF_RADIO->SHORTS = 0;
goto phy_isr_exit;
}
}
/* Initialize flags, channel and state in ble header at rx start */
ble_hdr = BLE_MBUF_HDR_PTR(g_ble_phy_data.rxpdu);
ble_hdr->rxinfo.flags = ble_ll_state_get();
ble_hdr->rxinfo.channel = g_ble_phy_data.phy_chan;
ble_hdr->rxinfo.handle = 0;
/* Call Link Layer receive start function */
rc = ble_ll_rx_start(g_ble_phy_data.rxpdu, g_ble_phy_data.phy_chan);
if (rc >= 0) {
g_ble_phy_data.phy_rx_started = 1;
if (rc > 0) {
/* We need to go from disabled to TXEN */
NRF_RADIO->SHORTS = RADIO_SHORTS_END_DISABLE_Msk |
RADIO_SHORTS_READY_START_Msk |
RADIO_SHORTS_DISABLED_TXEN_Msk;
} else {
NRF_RADIO->SHORTS = RADIO_SHORTS_END_DISABLE_Msk |
RADIO_SHORTS_READY_START_Msk;
}
/* Set rx end ISR enable */
NRF_RADIO->INTENSET = RADIO_INTENSET_END_Msk;
} else {
/* Disable PHY */
ble_phy_disable();
irq_en = 0;
++g_ble_phy_stats.rx_aborts;
}
/* Count rx starts */
++g_ble_phy_stats.rx_starts;
}
/* Receive packet end (we dont enable this for transmit) */
if ((irq_en & RADIO_INTENCLR_END_Msk) && NRF_RADIO->EVENTS_END) {
/* Clear events and clear interrupt */
NRF_RADIO->EVENTS_END = 0;
NRF_RADIO->INTENCLR = RADIO_INTENCLR_END_Msk;
/* Set RSSI and CRC status flag in header */
ble_hdr = BLE_MBUF_HDR_PTR(g_ble_phy_data.rxpdu);
assert(NRF_RADIO->EVENTS_RSSIEND != 0);
ble_hdr->rxinfo.rssi = -1 * NRF_RADIO->RSSISAMPLE;
ble_hdr->end_cputime = NRF_TIMER0->CC[2];
/* Count PHY crc errors and valid packets */
crcok = (uint8_t)NRF_RADIO->CRCSTATUS;
if (!crcok) {
++g_ble_phy_stats.rx_crc_err;
} else {
++g_ble_phy_stats.rx_valid;
ble_hdr->rxinfo.flags |= BLE_MBUF_HDR_F_CRC_OK;
}
/* Call Link Layer receive payload function */
rxpdu = g_ble_phy_data.rxpdu;
g_ble_phy_data.rxpdu = NULL;
rc = ble_ll_rx_end(rxpdu, ble_hdr);
if (rc < 0) {
/* Disable the PHY. */
ble_phy_disable();
}
}
phy_isr_exit:
/* Ensures IRQ is cleared */
state = NRF_RADIO->SHORTS;
/* Count # of interrupts */
++g_ble_phy_stats.phy_isrs;
}
