/**
* \brief Sends the frame at the next backoff boundary
*/
static void send_frame_at_next_backoff_boundary(void)
{
uint8_t ack_is_requested;
uint32_t now_time_us;
/*
* Locate the next backoff boundary for the frame transmissiom;
* this backoff boundary is the starttime for the frame fransmission.
* Use a blocking approach, since next backoff boundary should be close.
*/
do {
pal_get_current_time(&now_time_us);
} while (pal_add_time_us(now_time_us, PRE_TX_DURATION_US) <
cca_starttime_us);
/* re-programm the interrupt handler */
pal_trx_irq_init((FUNC_PTR)ack_reception_handler_cb);
pal_trx_irq_en();
/* debug pin to switch on: define ENABLE_DEBUG_PINS, pal_config.h */
PIN_TX_START();
/* Check if an acknowledgement is requested for this frame. */
ack_is_requested = *(tal_frame_to_tx + 1) & FCF_ACK_REQUEST;
if (ack_is_requested > 0) {
tal_csma_state = FRAME_SENDING_WITH_ACK;
} else {
tal_csma_state = FRAME_SENDING_NO_ACK;
}
/* download and send frame, no CSMA and no frame_retry */
send_frame(NO_CSMA_NO_IFS, false);
}
/**
* \brief Sends the frame at the next backoff boundary
*/
static void send_frame_at_next_backoff_boundary(void)
{
uint32_t now_time_us;
/*
* Locate the next backoff boundary for the frame transmissiom;
* this backoff boundary is the starttime for the frame fransmission.
* Use a blocking approach, since next backoff boundary should be close.
*/
do {
pal_get_current_time(&now_time_us);
} while (pal_add_time_us(now_time_us, PRE_TX_DURATION_US) <
cca_starttime_us);
/* debug pin to switch on: define ENABLE_DEBUG_PINS, pal_config.h */
PIN_TX_START();
tal_csma_state = FRAME_SENDING;
/* download and send frame, no CSMA and no frame_retry */
send_frame(NO_CSMA_NO_IFS, false);
}
