mirror of https://github.com/pvnis/srsRAN_4G.git
Added usrp_capture_sync example
ismagom
10 years ago
parent
8274370d3d
commit
f253321ebb
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/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2014 The srsLTE Developers. See the
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* COPYRIGHT file at the top-level directory of this distribution.
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE 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 Lesser General Public License for more details.
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*
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* A copy of the GNU Lesser General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include <stdio.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include <math.h>
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#include <time.h>
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#include <stdbool.h>
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#include "srslte/srslte.h"
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#include "srslte/cuhd/cuhd.h"
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static bool keep_running = true;
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char *output_file_name = NULL;
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char *uhd_args="";
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float uhd_gain=40.0, uhd_freq=-1.0;
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int nof_prb = 6;
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int nof_subframes = -1;
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int N_id_2 = -1;
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void int_handler(int dummy) {
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keep_running = false;
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}
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void usage(char *prog) {
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printf("Usage: %s [agrnv] -l N_id_2 -f rx_frequency_hz -o output_file\n", prog);
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printf("\t-a UHD args [Default %s]\n", uhd_args);
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printf("\t-g UHD Gain [Default %.2f dB]\n", uhd_gain);
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printf("\t-p nof_prb [Default %d]\n", nof_prb);
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printf("\t-n nof_subframes [Default %d]\n", nof_subframes);
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printf("\t-v srslte_verbose\n");
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}
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void parse_args(int argc, char **argv) {
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int opt;
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while ((opt = getopt(argc, argv, "agpnvfol")) != -1) {
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switch (opt) {
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case 'o':
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output_file_name = argv[optind];
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break;
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case 'a':
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uhd_args = argv[optind];
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break;
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case 'g':
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uhd_gain = atof(argv[optind]);
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break;
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case 'p':
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nof_prb = atoi(argv[optind]);
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break;
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case 'f':
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uhd_freq = atof(argv[optind]);
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break;
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case 'n':
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nof_subframes = atoi(argv[optind]);
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break;
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case 'l':
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N_id_2 = atoi(argv[optind]);
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break;
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case 'v':
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srslte_verbose++;
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break;
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default:
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usage(argv[0]);
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exit(-1);
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}
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}
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if (uhd_freq < 0 || N_id_2 == -1 || output_file_name == NULL) {
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usage(argv[0]);
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exit(-1);
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}
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}
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int cuhd_recv_wrapper(void *h, void *data, uint32_t nsamples, srslte_timestamp_t *t) {
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DEBUG(" ---- Receive %d samples ---- \n", nsamples);
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return cuhd_recv(h, data, nsamples, 1);
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}
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enum receiver_state { DECODE_MIB, SAVE_FILE} state;
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int main(int argc, char **argv) {
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cf_t *buffer;
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int subframe_count, n;
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void *uhd;
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srslte_filesink_t sink;
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srslte_ue_mib_t ue_mib;
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srslte_ue_sync_t ue_sync;
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srslte_cell_t cell;
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enum receiver_state state;
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uint8_t bch_payload[BCH_PAYLOAD_LEN];
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signal(SIGINT, int_handler);
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parse_args(argc, argv);
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subframe_count = 0;
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srslte_filesink_init(&sink, output_file_name, SRSLTE_COMPLEX_FLOAT_BIN);
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printf("Opening UHD device...\n");
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if (cuhd_open(uhd_args, &uhd)) {
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fprintf(stderr, "Error opening uhd\n");
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exit(-1);
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}
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printf("Set RX freq: %.6f MHz\n", cuhd_set_rx_freq(uhd, uhd_freq) / 1000000);
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printf("Set RX gain: %.1f dB\n", cuhd_set_rx_gain(uhd, uhd_gain));
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printf("Set RX rate: %.6f MHz\n", cuhd_set_rx_srate(uhd, srslte_sampling_freq_hz(nof_prb)) / 1000000);
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cuhd_rx_wait_lo_locked(uhd);
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cuhd_start_rx_stream(uhd);
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cell.cp = SRSLTE_CP_NORM;
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cell.id = N_id_2;
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cell.nof_prb = nof_prb;
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cell.nof_ports = 1;
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if (srslte_ue_sync_init(&ue_sync, cell, cuhd_recv_wrapper, uhd)) {
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fprintf(stderr, "Error initiating ue_sync\n");
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exit(-1);
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}
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if (srslte_ue_mib_init(&ue_mib, cell)) {
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fprintf(stderr, "Error initaiting UE MIB decoder\n");
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exit(-1);
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}
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state = DECODE_MIB;
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bool decoded_mib = false;
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uint32_t sfn, sfn_offset;
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printf("Waiting for SFN=0\n");
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while((subframe_count < nof_subframes || nof_subframes == -1)
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&& keep_running)
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{
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n = srslte_ue_sync_get_buffer(&ue_sync, &buffer);
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if (n < 0) {
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fprintf(stderr, "Error receiving samples\n");
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exit(-1);
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}
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if (n == 1) {
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switch (state) {
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case DECODE_MIB:
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if (srslte_ue_sync_get_sfidx(&ue_sync) == 0) {
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srslte_pbch_decode_reset(&ue_mib.pbch);
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n = srslte_ue_mib_decode(&ue_mib, buffer, bch_payload, NULL, &sfn_offset);
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if (n < 0) {
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fprintf(stderr, "Error decoding UE MIB\n");
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exit(-1);
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} else if (n == SRSLTE_UE_MIB_FOUND) {
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srslte_pbch_mib_unpack(bch_payload, &cell, &sfn);
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sfn = (sfn + sfn_offset)%1024;
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decoded_mib = true;
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}
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}
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if (decoded_mib && srslte_ue_sync_get_sfidx(&ue_sync) == 9 && sfn == 1023) {
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srslte_pbch_mib_fprint(stdout, &cell, sfn, cell.id);
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printf("Decoded MIB. SFN: %d\n", sfn);
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state = SAVE_FILE;
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}
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break;
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case SAVE_FILE:
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printf("Writing to file %4d subframes...\r", subframe_count);
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srslte_filesink_write(&sink, buffer, SRSLTE_SF_LEN_PRB(nof_prb));
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subframe_count++;
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break;
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}
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if (srslte_ue_sync_get_sfidx(&ue_sync) == 9) {
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sfn++;
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if (sfn == 1024) {
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sfn = 0;
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}
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}
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}
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}
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srslte_filesink_free(&sink);
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cuhd_close(uhd);
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srslte_ue_sync_free(&ue_sync);
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printf("Ok - wrote %d subframes\n", subframe_count);
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exit(0);
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}
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