249 lines
7.3 KiB
C
249 lines
7.3 KiB
C
/*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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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 Affero 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 Affero General Public License for more details.
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*
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* A copy of the GNU Affero 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 <math.h>
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#include <signal.h>
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#include <stdio.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 <time.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include "srslte/phy/rf/rf.h"
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#include "srslte/srslte.h"
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static bool keep_running = true;
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char* output_file_name = NULL;
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static char rf_devname[64] = "";
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static char rf_args[64] = "auto";
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float rf_gain = 60.0, rf_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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uint32_t nof_rx_antennas = 1;
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bool use_standard_lte_rates = false;
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srslte_ue_sync_mode_t sync_mode = SYNC_MODE_PSS;
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void int_handler(int dummy)
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{
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keep_running = false;
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}
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void usage(char* prog)
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{
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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 RF args [Default %s]\n", rf_args);
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printf("\t-d RF devicename [Default %s]\n", rf_devname);
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printf("\t-e use_standard_lte_rates [Default %i]\n", use_standard_lte_rates);
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printf("\t-g RF Gain [Default %.2f dB]\n", rf_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-m Use GPS sync mode [Default %s]\n", sync_mode == SYNC_MODE_PSS ? "false" : "true");
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printf("\t-A nof_rx_antennas [Default %d]\n", nof_rx_antennas);
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printf("\t-v verbose\n");
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}
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void parse_args(int argc, char** argv)
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{
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int opt;
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while ((opt = getopt(argc, argv, "adegpnmvfolA")) != -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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strncpy(rf_args, argv[optind], 63);
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rf_args[63] = '\0';
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break;
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case 'd':
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strncpy(rf_devname, argv[optind], 63);
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rf_devname[63] = '\0';
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break;
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case 'e':
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use_standard_lte_rates = true;
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break;
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case 'g':
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rf_gain = strtof(argv[optind], NULL);
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break;
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case 'p':
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nof_prb = (int)strtol(argv[optind], NULL, 10);
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break;
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case 'f':
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rf_freq = strtof(argv[optind], NULL);
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break;
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case 'n':
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nof_subframes = (int)strtol(argv[optind], NULL, 10);
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break;
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case 'm':
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sync_mode = SYNC_MODE_GNSS;
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break;
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case 'l':
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N_id_2 = (int)strtol(argv[optind], NULL, 10);
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break;
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case 'A':
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nof_rx_antennas = (uint32_t)strtol(argv[optind], NULL, 10);
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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 (&rf_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 srslte_rf_recv_wrapper(void* h, cf_t* data[SRSLTE_MAX_PORTS], uint32_t nsamples, srslte_timestamp_t* t)
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{
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DEBUG(" ---- Receive %d samples ---- \n", nsamples);
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void* ptr[SRSLTE_MAX_PORTS];
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for (int i = 0; i < SRSLTE_MAX_PORTS; i++) {
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ptr[i] = data[i];
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}
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return srslte_rf_recv_with_time_multi(h, ptr, nsamples, true, &t->full_secs, &t->frac_secs);
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}
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int main(int argc, char** argv)
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{
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cf_t* buffer[SRSLTE_MAX_PORTS] = {NULL};
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int n;
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srslte_rf_t rf;
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srslte_filesink_t sink;
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srslte_ue_sync_t ue_sync;
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srslte_cell_t cell;
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signal(SIGINT, int_handler);
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parse_args(argc, argv);
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srslte_use_standard_symbol_size(use_standard_lte_rates);
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srslte_filesink_init(&sink, output_file_name, SRSLTE_COMPLEX_FLOAT_BIN);
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printf("Opening RF device...\n");
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if (srslte_rf_open_multi(&rf, rf_args, nof_rx_antennas)) {
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ERROR("Error opening rf\n");
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exit(-1);
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}
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uint32_t max_num_samples = 3 * SRSLTE_SF_LEN_MAX;
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for (int i = 0; i < nof_rx_antennas; i++) {
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buffer[i] = srslte_vec_cf_malloc(max_num_samples);
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}
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sigset_t sigset;
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sigemptyset(&sigset);
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sigaddset(&sigset, SIGINT);
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sigprocmask(SIG_UNBLOCK, &sigset, NULL);
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printf("Set RX freq: %.6f MHz\n", srslte_rf_set_rx_freq(&rf, nof_rx_antennas, rf_freq) / 1000000);
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printf("Set RX gain: %.1f dB\n", srslte_rf_set_rx_gain(&rf, rf_gain));
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int srate = srslte_sampling_freq_hz(nof_prb);
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if (srate != -1) {
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printf("Setting sampling rate %.2f MHz\n", (float)srate / 1000000);
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float srate_rf = srslte_rf_set_rx_srate(&rf, (double)srate);
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if (srate_rf != srate) {
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ERROR("Could not set sampling rate\n");
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exit(-1);
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}
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} else {
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ERROR("Invalid number of PRB %d\n", nof_prb);
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exit(-1);
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}
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srslte_rf_start_rx_stream(&rf, false);
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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_multi_decim_mode(
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&ue_sync, cell.nof_prb, cell.id == 1000, srslte_rf_recv_wrapper, nof_rx_antennas, (void*)&rf, 1, sync_mode)) {
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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_sync_set_cell(&ue_sync, cell)) {
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ERROR("Error initiating ue_sync\n");
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exit(-1);
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}
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uint32_t subframe_count = 0;
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bool start_capture = false;
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bool stop_capture = false;
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srslte_timestamp_t ts_rx_start = {};
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while ((subframe_count < nof_subframes || nof_subframes == -1) && !stop_capture) {
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n = srslte_ue_sync_zerocopy(&ue_sync, buffer, max_num_samples);
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if (n < 0) {
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ERROR("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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if (!start_capture) {
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if (srslte_ue_sync_get_sfidx(&ue_sync) == 9) {
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start_capture = true;
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}
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} else {
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printf("Writing to file %6d subframes...\r", subframe_count);
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srslte_filesink_write_multi(&sink, (void**)buffer, SRSLTE_SF_LEN_PRB(nof_prb), nof_rx_antennas);
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// store time stamp of first subframe
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if (subframe_count == 0) {
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srslte_ue_sync_get_last_timestamp(&ue_sync, &ts_rx_start);
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}
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subframe_count++;
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}
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}
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if (!keep_running) {
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if (!start_capture || (start_capture && srslte_ue_sync_get_sfidx(&ue_sync) == 9)) {
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stop_capture = true;
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}
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}
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}
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srslte_filesink_free(&sink);
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srslte_rf_close(&rf);
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srslte_ue_sync_free(&ue_sync);
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for (int i = 0; i < nof_rx_antennas; i++) {
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if (buffer[i]) {
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free(buffer[i]);
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}
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}
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printf("\nOk - wrote %d subframes\n", subframe_count);
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srslte_ue_sync_set_tti_from_timestamp(&ue_sync, &ts_rx_start);
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printf("Start of capture at %ld+%.3f. TTI=%d.%d\n",
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ts_rx_start.full_secs,
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ts_rx_start.frac_secs,
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srslte_ue_sync_get_sfn(&ue_sync),
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srslte_ue_sync_get_sfidx(&ue_sync));
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return SRSLTE_SUCCESS;
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}
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