115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*
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* OsmocomBB <-> SDR connection bridge
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* TDMA scheduler: common routines for lchan handlers
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*
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* (C) 2017 by Vadim Yanitskiy <axilirator@gmail.com>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <errno.h>
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#include <string.h>
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#include <talloc.h>
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#include <stdint.h>
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#include <arpa/inet.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/bits.h>
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#include "l1ctl_proto.h"
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#include "scheduler.h"
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#include "sched_trx.h"
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#include "logging.h"
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#include "trx_if.h"
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#include "trxcon.h"
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#include "l1ctl.h"
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/* GSM 05.02 Chapter 5.2.3 Normal Burst (NB) */
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const uint8_t nb_training_bits[8][26] = {
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{
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0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0,
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0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1,
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},
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{
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0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1,
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1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1,
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},
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{
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0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1,
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0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0,
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},
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{
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0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0,
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1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0,
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},
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{
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0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0,
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1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1,
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},
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{
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0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0,
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0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0,
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},
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{
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1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1,
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0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1,
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},
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{
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1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0,
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0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0,
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},
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};
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int sched_send_data_ind(struct trx_instance *trx, struct trx_ts *ts,
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struct trx_lchan_state *lchan, uint8_t *l2, size_t l2_len)
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{
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const struct trx_lchan_desc *lchan_desc;
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struct l1ctl_info_dl *data;
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/* Allocate memory */
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data = talloc_zero_size(ts, sizeof(struct l1ctl_info_dl) + l2_len);
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if (data == NULL)
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return -ENOMEM;
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/* Set up pointers */
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lchan_desc = &trx_lchan_desc[lchan->type];
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/* Fill in known downlink info */
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data->chan_nr = lchan_desc->chan_nr | ts->index;
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data->link_id = lchan_desc->link_id;
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data->band_arfcn = htons(trx->band_arfcn);
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data->frame_nr = htonl(lchan->rx_first_fn);
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data->rx_level = -(lchan->rssi_sum / lchan->rssi_num);
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/* FIXME: set proper values */
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data->num_biterr = 0;
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data->fire_crc = 0;
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data->snr = 0;
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/* Fill in the payload */
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memcpy(data->payload, l2, l2_len);
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/* Put a packet to higher layers */
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l1ctl_tx_data_ind(trx->l1l, data, l2_len == 23 ?
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L1CTL_DATA_IND : L1CTL_TRAFFIC_IND);
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talloc_free(data);
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return 0;
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}
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