void at86rf231_rx_handler(void)
{
uint8_t lqi, fcs_rssi;
// read packet length
at86rf231_read_fifo(&at86rf231_rx_buffer[rx_buffer_next].length, 1);
// read psdu, read packet with length as first byte and lqi as last byte.
uint8_t *buf = buffer[rx_buffer_next];
at86rf231_read_fifo(buf, at86rf231_rx_buffer[rx_buffer_next].length);
// read lqi which is appended after the psdu
lqi = buf[at86rf231_rx_buffer[rx_buffer_next].length - 1];
// read fcs and rssi, from a register
fcs_rssi = at86rf231_reg_read(AT86RF231_REG__PHY_RSSI);
// build package
at86rf231_rx_buffer[rx_buffer_next].lqi = lqi;
// RSSI has no meaning here, it should be read during packet reception.
at86rf231_rx_buffer[rx_buffer_next].rssi = fcs_rssi & 0x0F; // bit[4:0]
// bit7, boolean, 1 FCS valid, 0 FCS not valid
at86rf231_rx_buffer[rx_buffer_next].crc = (fcs_rssi >> 7) & 0x01;
if (at86rf231_rx_buffer[rx_buffer_next].crc == 0) {
DEBUG("Got packet with invalid crc.\n");
return;
}
ieee802154_frame_read(&buf[1], &at86rf231_rx_buffer[rx_buffer_next].frame,
at86rf231_rx_buffer[rx_buffer_next].length);
if (at86rf231_rx_buffer[rx_buffer_next].frame.fcf.frame_type != 2) {
#if DEBUG_ENABLED
ieee802154_frame_print_fcf_frame(&at86rf231_rx_buffer[rx_buffer_next].frame);
#endif
/* notify transceiver thread if any */
if (transceiver_pid) {
msg_t m;
m.type = (uint16_t) RCV_PKT_AT86RF231;
m.content.value = rx_buffer_next;
msg_send_int(&m, transceiver_pid);
}
}
else {
#if DEBUG_ENABLED
DEBUG("GOT ACK for SEQ %u\n", at86rf231_rx_buffer[rx_buffer_next].frame.seq_nr);
ieee802154_frame_print_fcf_frame(&at86rf231_rx_buffer[rx_buffer_next].frame);
#endif
}
// shift to next buffer element
if (++rx_buffer_next == AT86RF231_RX_BUF_SIZE) {
rx_buffer_next = 0;
}
// Read IRQ to clear it
at86rf231_reg_read(AT86RF231_REG__IRQ_STATUS);
}
void at86rf231_rx_handler(void)
{
uint8_t lqi, fcs_rssi;
/* read packet length */
at86rf231_read_fifo(&at86rf231_rx_buffer[rx_buffer_next].length, 1);
/* read psdu, read packet with length as first byte and lqi as last byte. */
uint8_t *buf = buffer[rx_buffer_next];
at86rf231_read_fifo(buf, at86rf231_rx_buffer[rx_buffer_next].length);
/* read lqi which is appended after the psdu */
lqi = buf[at86rf231_rx_buffer[rx_buffer_next].length - 1];
/* read fcs and rssi, from a register */
fcs_rssi = at86rf231_reg_read(AT86RF231_REG__PHY_RSSI);
/* build package */
at86rf231_rx_buffer[rx_buffer_next].lqi = lqi;
/* RSSI has no meaning here, it should be read during packet reception. */
at86rf231_rx_buffer[rx_buffer_next].rssi = fcs_rssi & 0x0F; // bit[4:0]
/* bit7, boolean, 1 FCS valid, 0 FCS not valid */
at86rf231_rx_buffer[rx_buffer_next].crc = (fcs_rssi >> 7) & 0x01;
if (at86rf231_rx_buffer[rx_buffer_next].crc == 0) {
DEBUG("at86rf231: Got packet with invalid crc.\n");
return;
}
#ifdef DEBUG_ENABLED
DEBUG("pkg: ");
for (int i = 1; i < at86rf231_rx_buffer[rx_buffer_next].length; i++) {
DEBUG("%x ", buf[i]);
}
DEBUG("\n");
#endif
/* read buffer into ieee802154_frame */
ieee802154_frame_read(&buf[1], &at86rf231_rx_buffer[rx_buffer_next].frame,
at86rf231_rx_buffer[rx_buffer_next].length);
/* if packet is no ACK */
if (at86rf231_rx_buffer[rx_buffer_next].frame.fcf.frame_type != IEEE_802154_ACK_FRAME) {
#ifdef DEBUG_ENABLED
ieee802154_frame_print_fcf_frame(&at86rf231_rx_buffer[rx_buffer_next].frame);
#endif
if (at86rf231_raw_packet_cb != NULL) {
at86rf231_raw_packet_cb(&at86rf231_netdev, (void*)buf,
at86rf231_rx_buffer[rx_buffer_next].length,
fcs_rssi, lqi, (fcs_rssi >> 7));
}
void set_ieee802154_fcf_values(ieee802154_frame_t *frame, uint8_t dest_mode,
uint8_t src_mode)
{
frame->fcf.frame_type = IEEE_802154_DATA_FRAME;
frame->fcf.sec_enb = 0;
frame->fcf.frame_pend = 0;
frame->fcf.ack_req = 0;
frame->fcf.panid_comp = 0;
frame->fcf.frame_ver = 0;
frame->fcf.src_addr_m = src_mode;
frame->fcf.dest_addr_m = dest_mode;
#if ENABLE_DEBUG
ieee802154_frame_print_fcf_frame(frame);
#endif
}
static void *recv_ieee802154_frame(void *arg)
{
(void) arg;
msg_t m;
#if (defined(MODULE_AT86RF231) | \
defined(MODULE_CC2420) | \
defined(MODULE_MC1322X))
ieee802154_packet_t *p;
#else
radio_packet_t *p;
uint8_t hdrlen;
#endif
uint8_t length;
ieee802154_frame_t frame;
net_if_eui64_t src, dst;
msg_init_queue(msg_q, RADIO_RCV_BUF_SIZE);
while (1) {
msg_receive(&m);
if (m.type == PKT_PENDING) {
#if (defined(MODULE_AT86RF231) | \
defined(MODULE_CC2420) | \
defined(MODULE_MC1322X))
p = (ieee802154_packet_t *) m.content.ptr;
memcpy(&frame, &p->frame, sizeof(ieee802154_frame_t));
length = p->frame.payload_len;
#else
p = (radio_packet_t *) m.content.ptr;
hdrlen = ieee802154_frame_read(p->data, &frame, p->length);
length = p->length - hdrlen - IEEE_802154_FCS_LEN;
#endif
#ifdef DEBUG_ENABLED
DEBUG("INFO: Received IEEE 802.15.4. packet (length = %d):\n", length);
DEBUG("INFO: FCF:\n");
ieee802154_frame_print_fcf_frame(&frame);
DEBUG("Sender:");
for (uint8_t i = 0; i < 8; i++) {
printf("%02x ", frame.src_addr[i]);
}
DEBUG("\n");
DEBUG("Receiver:");
for (size_t i = 0; i < 8; i++) {
printf("%02x ", frame.dest_addr[i]);
}
DEBUG("\n");
DEBUG("Payload:\n");
for (uint8_t i = 0; i < frame.payload_len; i++) {
printf("%02x ", frame.payload[i]);
if (!((i + 1) % 16) || i == frame.payload_len - 1) {
printf("\n");
}
}
#endif
if (frame.fcf.src_addr_m == IEEE_802154_SHORT_ADDR_M) {
mac_frame_short_to_eui64(&src, frame.src_addr);
}
else if (frame.fcf.src_addr_m == IEEE_802154_LONG_ADDR_M) {
memcpy(&src, frame.src_addr, 8);
}
else {
DEBUG("Unknown IEEE 802.15.4 source address mode.\n");
continue;
}
if (frame.fcf.dest_addr_m == IEEE_802154_SHORT_ADDR_M) {
mac_frame_short_to_eui64(&dst, frame.dest_addr);
}
else if (frame.fcf.dest_addr_m == IEEE_802154_LONG_ADDR_M) {
memcpy(&dst, frame.dest_addr, 8);
}
else {
DEBUG("Unknown IEEE 802.15.4 destination address mode.\n");
continue;
}
/* deliver packet to network(6lowpan)-layer */
lowpan_read(frame.payload, length, &src, &dst);
/* TODO: get interface ID somehow */
p->processing--;
}
else if (m.type == ENOBUFFER) {
DEBUG("Transceiver buffer full");
}
else {
DEBUG("Unknown packet received");
}
}
return NULL;
}