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));
}
