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98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/*
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* Copyright (C) 2014 INRIA
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_at86rf231
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* @{
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*
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* @file
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* @brief RX related functionality for the AT86RF231 device driver
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*
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* @author Alaeddine Weslati <alaeddine.weslati@inria.fr>
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* @author Thomas Eichinger <thomas.eichinger@fu-berlin.de>
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*
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* @}
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*/
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#include "at86rf231.h"
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#include "at86rf231_spi.h"
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#include "kernel_types.h"
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#include "transceiver.h"
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#include "msg.h"
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#define ENABLE_DEBUG (0)
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#if ENABLE_DEBUG
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#define DEBUG_ENABLED (1)
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#endif
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#include "debug.h"
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at86rf231_packet_t at86rf231_rx_buffer[AT86RF231_RX_BUF_SIZE];
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uint8_t buffer[AT86RF231_RX_BUF_SIZE][AT86RF231_MAX_PKT_LENGTH];
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volatile uint8_t rx_buffer_next;
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void at86rf231_rx_handler(void)
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{
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uint8_t lqi, fcs_rssi;
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// read packet length
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at86rf231_read_fifo(&at86rf231_rx_buffer[rx_buffer_next].length, 1);
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// read psdu, read packet with length as first byte and lqi as last byte.
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uint8_t *buf = buffer[rx_buffer_next];
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at86rf231_read_fifo(buf, at86rf231_rx_buffer[rx_buffer_next].length);
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// read lqi which is appended after the psdu
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lqi = buf[at86rf231_rx_buffer[rx_buffer_next].length - 1];
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// read fcs and rssi, from a register
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fcs_rssi = at86rf231_reg_read(AT86RF231_REG__PHY_RSSI);
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// build package
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at86rf231_rx_buffer[rx_buffer_next].lqi = lqi;
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// RSSI has no meaning here, it should be read during packet reception.
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at86rf231_rx_buffer[rx_buffer_next].rssi = fcs_rssi & 0x0F; // bit[4:0]
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// bit7, boolean, 1 FCS valid, 0 FCS not valid
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at86rf231_rx_buffer[rx_buffer_next].crc = (fcs_rssi >> 7) & 0x01;
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if (at86rf231_rx_buffer[rx_buffer_next].crc == 0) {
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DEBUG("Got packet with invalid crc.\n");
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return;
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}
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ieee802154_frame_read(&buf[1], &at86rf231_rx_buffer[rx_buffer_next].frame,
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at86rf231_rx_buffer[rx_buffer_next].length);
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if (at86rf231_rx_buffer[rx_buffer_next].frame.fcf.frame_type != 2) {
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#if DEBUG_ENABLED
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ieee802154_frame_print_fcf_frame(&at86rf231_rx_buffer[rx_buffer_next].frame);
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#endif
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/* notify transceiver thread if any */
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if (transceiver_pid != KERNEL_PID_UNDEF) {
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msg_t m;
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m.type = (uint16_t) RCV_PKT_AT86RF231;
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m.content.value = rx_buffer_next;
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msg_send_int(&m, transceiver_pid);
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}
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}
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else {
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#if DEBUG_ENABLED
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DEBUG("GOT ACK for SEQ %u\n", at86rf231_rx_buffer[rx_buffer_next].frame.seq_nr);
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ieee802154_frame_print_fcf_frame(&at86rf231_rx_buffer[rx_buffer_next].frame);
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#endif
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}
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// shift to next buffer element
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if (++rx_buffer_next == AT86RF231_RX_BUF_SIZE) {
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rx_buffer_next = 0;
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}
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// Read IRQ to clear it
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at86rf231_reg_read(AT86RF231_REG__IRQ_STATUS);
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}
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