Exemple #1
0
/**
 * @brief Start CCA.
 *
 * @param parameter Pointer to trx_id
 */
static void cca_start(void *parameter)
{
	trx_id_t trx_id = *(trx_id_t *)parameter;

	/* Check if trx is currently detecting a frame ota */
	if (trx_state[trx_id] == RF_RX) {
		uint16_t reg_offset = RF_BASE_ADDR_OFFSET * trx_id;
		uint8_t agc_freeze
			= trx_bit_read(reg_offset + SR_RF09_AGCC_FRZS);
		if (agc_freeze) {
			csma_continue(trx_id);
		} else {
#ifdef SUPPORT_MODE_SWITCH
			if (tal_pib[trx_id].ModeSwitchEnabled) {
				trigger_cca_meaurement(trx_id);
			} else
#endif
			{
				transmit_frame(trx_id, WITH_CCA);
			}
		}
	} else {
#ifdef SUPPORT_MODE_SWITCH
		if (tal_pib[trx_id].ModeSwitchEnabled) {
			trigger_cca_meaurement(trx_id);
		} else
#endif
		{
			transmit_frame(trx_id, WITH_CCA);
		}
	}
}
Exemple #2
0
/**
 * @brief Callback function for CCA completion.
 *
 * @param trx_id Transceiver identifier
 */
void cca_done_handling(trx_id_t trx_id)
{
	switch_to_txprep(trx_id); /* Leave state Rx */

	/* Switch BB on again */
	uint16_t reg_offset = RF_BASE_ADDR_OFFSET * trx_id;
	trx_bit_write(reg_offset + SR_BBC0_PC_BBEN, 1);

	/* Determine if channel is idle */
	if (tal_current_ed_val[trx_id] < tal_pib[trx_id].CCAThreshold) {
		/* Idle */
		tx_ms_ppdu(trx_id);
	} else {
		/* Busy */
		csma_continue(trx_id);
	}
}
/*
 * \brief TAL task handling
 *
 * This function
 * - Checks and allocates the receive buffer.
 * - Processes the TAL incoming frame queue.
 * - Implements the TAL state machine.
 */
void tal_task(void)
{
	/* Check if the receiver needs to be switched on. */
	if (tal_rx_on_required && (tal_state == TAL_IDLE)) {
		/* Check if a receive buffer has not been available before. */
		if (tal_rx_buffer == NULL) {
			tal_rx_buffer = bmm_buffer_alloc(LARGE_BUFFER_SIZE);
		}

		/* Check if buffer could be allocated */
		if (NULL != tal_rx_buffer) {
			/*
			 * Note:
			 * This flag needs to be reset BEFORE the received is
			 * switched on.
			 */
			tal_rx_on_required = false;

#ifdef PROMISCUOUS_MODE
			if (tal_pib.PromiscuousMode) {
				set_trx_state(CMD_RX_ON);
			} else {
				set_trx_state(CMD_RX_AACK_ON);
			}

#else   /* Normal operation */
			set_trx_state(CMD_RX_AACK_ON);
#endif
		}
	} else {
		/* no free buffer is available; try next time again */
	}

	/*
	 * If the transceiver has received a frame and it has been placed
	 * into the queue of the TAL, the frame needs to be processed further.
	 */
	if (tal_incoming_frame_queue.size > 0) {
		buffer_t *rx_frame;

		/* Check if there are any pending data in the
		 * incoming_frame_queue. */
		rx_frame = qmm_queue_remove(&tal_incoming_frame_queue, NULL);
		if (NULL != rx_frame) {
			process_incoming_frame(rx_frame);
		}
	}

	/* Handle the TAL state machines */
	switch (tal_state) {
	case TAL_IDLE:
	/* Do nothing, but fall through... */
	case TAL_TX_AUTO:

		/* Wait until state is changed to TAL_TX_DONE inside tx end ISR
		**/
		break;

#ifdef SW_CONTROLLED_CSMA
	case TAL_BACKOFF:
	/* Do nothing, but fall through... */
	case TAL_CCA:
		/* Do nothing */
		break;

	case TAL_CSMA_CONTINUE:
		csma_continue();
		break;

	case TAL_CCA_DONE:
		cca_done_handling();
		break;
#endif
	case TAL_TX_DONE:
		tx_done_handling(); /* see tal_tx.c */
		break;

#ifdef BEACON_SUPPORT
	case TAL_SLOTTED_CSMA:
		slotted_csma_state_handling(); /* see tal_slotted_csma.c */
		break;
#endif  /* BEACON_SUPPORT */

#if (MAC_SCAN_ED_REQUEST_CONFIRM == 1)
	case TAL_ED_RUNNING:
		/* Do nothing here. Wait until ED is completed. */
		break;

	case TAL_ED_DONE:
		ed_scan_done();
		break;
#endif /* (MAC_SCAN_ED_REQUEST_CONFIRM == 1) */
	default:
		Assert("tal_state is not handled" == 0);
		break;
	}
} /* tal_task() */