2017-07-06 06:17:24 +00:00
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/*
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* OsmocomBB <-> SDR connection bridge
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* TDMA scheduler: handlers for DL / UL bursts on logical channels
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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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2017-07-13 18:38:48 +00:00
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#include <osmocom/core/linuxlist.h>
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2017-07-06 06:17:24 +00:00
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#include <osmocom/core/logging.h>
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#include <osmocom/core/bits.h>
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2017-07-07 00:11:26 +00:00
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#include <osmocom/gsm/gsm_utils.h>
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2017-07-06 06:17:24 +00:00
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#include <osmocom/coding/gsm0503_coding.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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2017-07-08 11:58:51 +00:00
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#include "l1ctl.h"
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2017-07-06 06:17:24 +00:00
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int rx_data_fn(struct trx_instance *trx, struct trx_ts *ts,
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2017-07-31 07:27:30 +00:00
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struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid,
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2017-07-31 08:03:51 +00:00
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sbit_t *bits, int8_t rssi, float toa)
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2017-07-06 06:17:24 +00:00
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{
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2017-07-31 07:27:30 +00:00
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const struct trx_lchan_desc *lchan_desc;
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2017-07-06 06:17:24 +00:00
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int n_errors, n_bits_total, rc;
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uint8_t *rssi_num, *toa_num;
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float *rssi_sum, *toa_sum;
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sbit_t *buffer, *offset;
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uint8_t l2[23], *mask;
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uint32_t *first_fn;
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/* Set up pointers */
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2017-07-31 07:27:30 +00:00
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lchan_desc = &trx_lchan_desc[lchan->type];
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2017-07-06 06:17:24 +00:00
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first_fn = &lchan->rx_first_fn;
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mask = &lchan->rx_burst_mask;
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buffer = lchan->rx_bursts;
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rssi_sum = &lchan->rssi_sum;
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rssi_num = &lchan->rssi_num;
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toa_sum = &lchan->toa_sum;
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toa_num = &lchan->toa_num;
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2017-08-19 06:38:24 +00:00
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LOGP(DSCHD, LOGL_DEBUG, "Data received on %s: fn=%u ts=%u bid=%u\n",
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2017-07-31 07:27:30 +00:00
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lchan_desc->name, fn, ts->index, bid);
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2017-07-06 06:17:24 +00:00
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/* Clear buffer & store frame number of first burst */
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if (bid == 0) {
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memset(buffer, 0, 464);
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*first_fn = fn;
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*mask = 0x0;
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*rssi_sum = 0;
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*rssi_num = 0;
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*toa_sum = 0;
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*toa_num = 0;
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}
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/* Update mask and RSSI */
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*mask |= (1 << bid);
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*rssi_sum += rssi;
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(*rssi_num)++;
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*toa_sum += toa;
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(*toa_num)++;
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/* Copy burst to buffer of 4 bursts */
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offset = buffer + bid * 116;
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memcpy(offset, bits + 3, 58);
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memcpy(offset + 58, bits + 87, 58);
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/* Wait until complete set of bursts */
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if (bid != 3)
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return 0;
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/* Check for complete set of bursts */
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if ((*mask & 0xf) != 0xf) {
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2017-08-19 06:38:24 +00:00
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LOGP(DSCHD, LOGL_DEBUG, "Received incomplete data frame at "
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2017-07-06 06:17:24 +00:00
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"fn=%u (%u/%u) for %s\n", *first_fn,
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(*first_fn) % ts->mf_layout->period,
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ts->mf_layout->period,
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2017-07-31 07:27:30 +00:00
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lchan_desc->name);
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2017-07-06 06:17:24 +00:00
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2017-07-28 10:03:05 +00:00
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return -1;
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2017-07-06 06:17:24 +00:00
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}
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/* Attempt to decode */
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rc = gsm0503_xcch_decode(l2, buffer, &n_errors, &n_bits_total);
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if (rc) {
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2017-08-19 06:38:24 +00:00
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LOGP(DSCHD, LOGL_DEBUG, "Received bad data frame at fn=%u "
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2017-07-06 06:17:24 +00:00
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"(%u/%u) for %s\n", *first_fn,
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(*first_fn) % ts->mf_layout->period,
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ts->mf_layout->period,
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2017-07-31 07:27:30 +00:00
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lchan_desc->name);
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2017-07-06 06:17:24 +00:00
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return rc;
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}
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2017-07-31 11:24:27 +00:00
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/* Send a L2 frame to the higher layers */
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sched_send_data_ind(trx, ts, lchan, l2, 23);
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2017-07-06 06:17:24 +00:00
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/* TODO: AGC, TA loops */
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return 0;
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}
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2017-07-07 00:11:26 +00:00
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2017-07-15 15:46:54 +00:00
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int tx_data_fn(struct trx_instance *trx, struct trx_ts *ts,
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2017-07-31 08:03:51 +00:00
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struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid)
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2017-07-15 15:46:54 +00:00
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{
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2017-07-31 07:27:30 +00:00
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const struct trx_lchan_desc *lchan_desc;
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2017-07-15 15:46:54 +00:00
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struct trx_ts_prim *prim;
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ubit_t burst[GSM_BURST_LEN];
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ubit_t *buffer, *offset;
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uint8_t *mask, *l2;
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2017-07-16 09:52:57 +00:00
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const uint8_t *tsc;
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2017-07-15 15:46:54 +00:00
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int rc;
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/* Set up pointers */
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2017-07-31 07:27:30 +00:00
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lchan_desc = &trx_lchan_desc[lchan->type];
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2017-07-15 15:46:54 +00:00
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mask = &lchan->tx_burst_mask;
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buffer = lchan->tx_bursts;
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if (bid > 0) {
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/* If we have encoded bursts */
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if (*mask)
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goto send_burst;
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else
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return 0;
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}
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/* Encode payload if not yet */
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/* Get a message from TX queue */
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prim = llist_entry(ts->tx_prims.next, struct trx_ts_prim, list);
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2017-08-12 19:20:19 +00:00
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l2 = (uint8_t *) prim->payload;
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2017-07-15 15:46:54 +00:00
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/* Encode bursts */
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rc = gsm0503_xcch_encode(buffer, l2);
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if (rc) {
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2017-08-19 06:38:24 +00:00
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LOGP(DSCHD, LOGL_ERROR, "Failed to encode L2 payload\n");
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2017-07-15 15:46:54 +00:00
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/* Remove primitive from queue and free memory */
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llist_del(&prim->list);
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talloc_free(prim);
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return -EINVAL;
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}
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send_burst:
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/* Determine which burst should be sent */
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offset = buffer + bid * 116;
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/* Update mask */
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*mask |= (1 << bid);
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2017-07-16 09:52:57 +00:00
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/* Choose proper TSC */
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2017-08-16 07:36:20 +00:00
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tsc = sched_nb_training_bits[trx->tsc];
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2017-07-16 09:52:57 +00:00
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2017-07-15 15:46:54 +00:00
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/* Compose a new burst */
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memset(burst, 0, 3); /* TB */
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memcpy(burst + 3, offset, 58); /* Payload 1/2 */
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2017-07-16 09:52:57 +00:00
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memcpy(burst + 61, tsc, 26); /* TSC */
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2017-07-15 15:46:54 +00:00
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memcpy(burst + 87, offset + 58, 58); /* Payload 2/2 */
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memset(burst + 145, 0, 3); /* TB */
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2017-08-19 06:38:24 +00:00
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LOGP(DSCHD, LOGL_DEBUG, "Transmitting %s fn=%u ts=%u burst=%u\n",
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2017-07-31 07:27:30 +00:00
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lchan_desc->name, fn, ts->index, bid);
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2017-07-15 15:46:54 +00:00
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/* Send burst to transceiver */
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2017-08-04 20:22:12 +00:00
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rc = trx_if_tx_burst(trx, ts->index, fn, trx->tx_power, burst);
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2017-07-15 15:46:54 +00:00
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if (rc) {
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2017-08-19 06:38:24 +00:00
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LOGP(DSCHD, LOGL_ERROR, "Could not send burst to transceiver\n");
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2017-07-16 10:13:34 +00:00
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/* Remove primitive from queue and free memory */
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prim = llist_entry(ts->tx_prims.next, struct trx_ts_prim, list);
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llist_del(&prim->list);
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talloc_free(prim);
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/* Reset mask */
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*mask = 0x00;
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2017-07-15 15:46:54 +00:00
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return rc;
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}
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2017-07-16 10:13:34 +00:00
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/* If we have sent the last (4/4) burst */
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if ((*mask & 0x0f) == 0x0f) {
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/* Remove primitive from queue and free memory */
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prim = llist_entry(ts->tx_prims.next, struct trx_ts_prim, list);
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llist_del(&prim->list);
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talloc_free(prim);
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/* Reset mask */
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*mask = 0x00;
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/* Confirm data sending */
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2017-08-15 10:03:02 +00:00
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sched_send_data_conf(trx, ts, lchan, fn, 23);
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2017-07-16 10:13:34 +00:00
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}
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2017-07-15 15:46:54 +00:00
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return 0;
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}
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