/*
* \brief Parses received frame and create the frame_info_t structure
*
* This function parses the received frame and creates the frame_info_t
* structure to be sent to the MAC as a parameter of tal_rx_frame_cb().
*
* \param buf Pointer to the buffer containing the received frame
*/
void process_incoming_frame(buffer_t *buf_ptr)
{
#ifndef TRX_REG_RAW_VALUE
uint8_t frame_len;
uint8_t *frame_ptr;
uint8_t ed_level;
uint8_t lqi;
#endif
frame_info_t *receive_frame = (frame_info_t *)BMM_BUFFER_POINTER(buf_ptr);
/* The frame is present towards the end of the buffer. */
#ifndef TRX_REG_RAW_VALUE
/*
* Store the last frame length for IFS handling.
* Substract LQI and length fields.
*/
frame_len = last_frame_length = receive_frame->mpdu[0];
#else
last_frame_length = receive_frame->mpdu[0];
#endif
#ifdef PROMISCUOUS_MODE
if (tal_pib.PromiscuousMode)
{
#ifndef TRX_REG_RAW_VALUE
frame_ptr = &(receive_frame->mpdu[frame_len + LQI_LEN]);
/*
* The LQI is stored after the FCS.
* The ED value is stored after the LQI.
*/
lqi = *frame_ptr++;
ed_level = *frame_ptr;
/*
* The LQI normalization is done using the ED level measured during
* the frame reception.
*/
#ifdef RSSI_TO_LQI_MAPPING
lqi = normalize_lqi(ed_level);
#else
lqi = normalize_lqi(lqi, ed_level);
#endif
/* Store normalized LQI value again. */
frame_ptr--;
*frame_ptr = lqi;
#endif /* #ifndef TRX_REG_RAW_VALUE */
receive_frame->buffer_header = buf_ptr;
/* The callback function implemented by MAC is invoked. */
tal_rx_frame_cb(receive_frame);
return;
}
#endif /* #ifdef PROMISCUOUS_MODE */
#ifdef BEACON_SUPPORT
/*
* Are we waiting for a beacon for slotted CSMA?
* Check if received frame is a beacon.
*/
if ((receive_frame->mpdu[PL_POS_FCF_1] & FCF_FRAMETYPE_MASK) == FCF_FRAMETYPE_BEACON)
{
/* Debug pin to switch on: define ENABLE_DEBUG_PINS, pal_config.h */
PIN_BEACON_START();
if (tal_csma_state == BACKOFF_WAITING_FOR_BEACON)
{
/* Debug pin to switch on: define ENABLE_DEBUG_PINS, pal_config.h */
PIN_WAITING_FOR_BEACON_END();
tal_pib.BeaconTxTime = TAL_CONVERT_US_TO_SYMBOLS(receive_frame->time_stamp);
tal_csma_state = CSMA_HANDLE_BEACON;
}
/* Debug pin to switch on: define ENABLE_DEBUG_PINS, pal_config.h */
PIN_BEACON_END();
}
#endif /* BEACON_SUPPORT */
#ifndef TRX_REG_RAW_VALUE
/*
* The LQI is stored after the FCS.
* The ED value is stored after the LQI.
*/
frame_ptr = &(receive_frame->mpdu[frame_len + LQI_LEN]);
lqi = *frame_ptr++;
ed_level = *frame_ptr;
/*
* The LQI normalization is done using the ED level measured during
* the frame reception.
*/
#ifdef RSSI_TO_LQI_MAPPING
lqi = normalize_lqi(ed_level);
#else
lqi = normalize_lqi(lqi, ed_level);
#endif
/* Store normalized LQI value again. */
frame_ptr--;
*frame_ptr = lqi;
#endif /* #ifndef TRX_REG_RAW_VALUE */
receive_frame->buffer_header = buf_ptr;
#ifdef ENABLE_RTB
/* The callback function implemented by RTB is invoked. */
rtb_rx_frame_cb(receive_frame);
#else
/* The callback function implemented by MAC is invoked. */
tal_rx_frame_cb(receive_frame);
#endif
} /* process_incoming_frame() */
void tal_tx_beacon(frame_info_t *tx_frame)
{
tal_trx_status_t trx_status;
/* Set pointer to actual mpdu to be downloaded to the transceiver. */
uint8_t *tal_beacon_to_tx = tx_frame->mpdu;
/*
* Avoid that the beacon is transmitted while transmitting
* a frame using slotted CSMA.
*/
if ((tal_csma_state == FRAME_SENDING_WITH_ACK) ||
(tal_csma_state == FRAME_SENDING_NO_ACK) ||
(tal_csma_state == WAITING_FOR_ACK)) {
Assert(
"trying to transmit beacon while ongoing transmission" ==
0);
return;
}
/* Send the pre-created beacon frame to the transceiver. */
/* debug pin to switch on: define ENABLE_DEBUG_PINS, pal_config.h */
PIN_BEACON_START();
/* \TODO wait for talbeaconTxTime */
do {
trx_status = set_trx_state(CMD_FORCE_PLL_ON);
#if (_DEBUG_ > 1)
if (trx_status != PLL_ON) {
Assert("PLL_ON failed for beacon transmission" == 0);
}
#endif
} while (trx_status != PLL_ON);
pal_trx_irq_dis();
/* Toggle the SLP_TR pin triggering transmission. */
PAL_SLP_TR_HIGH();
PAL_WAIT_65_NS();
PAL_SLP_TR_LOW();
/*
* Send the frame to the transceiver.
* Note: The PhyHeader is the first byte of the frame to
* be sent to the transceiver and this contains the frame
* length.
* The actual length of the frame to be downloaded
* (parameter two of pal_trx_frame_write)
* is
* 1 octet frame length octet
* + n octets frame (i.e. value of frame_tx[0])
* - 2 octets FCS
*/
pal_trx_frame_write(tal_beacon_to_tx, tal_beacon_to_tx[0] - 1);
#ifndef NON_BLOCKING_SPI
pal_trx_irq_en();
#endif
tal_state = TAL_TX_BEACON;
}
