mirror of https://github.com/PentHertz/srsLTE.git
190 lines
5.4 KiB
C
190 lines
5.4 KiB
C
/*
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* Copyright 2013-2019 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 <stdio.h>
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#include <stdlib.h>
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#include <string.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 <complex.h>
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#include "srslte/phy/rf/rf.h"
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#include "srslte/srslte.h"
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uint32_t nof_prb = 25;
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uint32_t nof_frames = 20;
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int time_adv_samples = 0;
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float tone_offset_hz = 1e6;
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float rf_rx_gain=40, srslte_rf_tx_gain=40, rf_freq=2.4e9;
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char *rf_args="";
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char *output_filename = NULL;
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char *input_filename = NULL;
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void usage(char *prog) {
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printf("Usage: %s -o [rx_signal_file]\n", prog);
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printf("\t-a RF args [Default %s]\n", rf_args);
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printf("\t-f RF TX/RX frequency [Default %.2f MHz]\n", rf_freq/1e6);
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printf("\t-g RF RX gain [Default %.1f dB]\n", rf_rx_gain);
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printf("\t-G RF TX gain [Default %.1f dB]\n", srslte_rf_tx_gain);
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printf("\t-t Single tone offset (Hz) [Default %f]\n", tone_offset_hz);
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printf("\t-T Time advance samples [Default %d]\n", time_adv_samples);
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printf("\t-i File name to read signal from [Default single tone]\n");
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printf("\t-p Number of UL RB [Default %d]\n", nof_prb);
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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, "ioafgGptT")) != -1) {
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switch (opt) {
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case 'a':
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rf_args = argv[optind];
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break;
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case 'o':
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output_filename = argv[optind];
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break;
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case 'i':
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input_filename = argv[optind];
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break;
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case 't':
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tone_offset_hz = strtof(argv[optind], NULL);
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break;
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case 'T':
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time_adv_samples = (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 'g':
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rf_rx_gain = strtof(argv[optind], NULL);
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break;
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case 'G':
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srslte_rf_tx_gain = strtof(argv[optind], NULL);
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break;
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case 'p':
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nof_prb = (uint32_t)strtol(argv[optind], NULL, 10);
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if (!srslte_nofprb_isvalid(nof_prb)) {
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ERROR("Invalid number of UL RB %d\n", nof_prb);
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exit(-1);
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}
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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 (!output_filename) {
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usage(argv[0]);
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exit(-1);
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}
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if (time_adv_samples < 0) {
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printf("Time advance must be positive\n");
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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 main(int argc, char **argv) {
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parse_args(argc, argv);
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uint32_t flen = srslte_sampling_freq_hz(nof_prb)/1000;
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cf_t *rx_buffer = malloc(sizeof(cf_t)*flen*nof_frames);
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if (!rx_buffer) {
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perror("malloc");
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exit(-1);
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}
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cf_t *tx_buffer = malloc(sizeof(cf_t)*(flen+time_adv_samples));
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if (!tx_buffer) {
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perror("malloc");
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exit(-1);
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}
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bzero(tx_buffer, sizeof(cf_t)*(flen+time_adv_samples));
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cf_t *zeros = calloc(sizeof(cf_t),flen);
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if (!zeros) {
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perror("calloc");
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exit(-1);
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}
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float time_adv_sec = (float) time_adv_samples/srslte_sampling_freq_hz(nof_prb);
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// Send through RF
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srslte_rf_t rf;
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printf("Opening RF device...\n");
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if (srslte_rf_open(&rf, rf_args)) {
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ERROR("Error opening rf\n");
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exit(-1);
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}
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int srate = srslte_sampling_freq_hz(nof_prb);
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srslte_rf_set_rx_srate(&rf, (double) srate);
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srslte_rf_set_tx_srate(&rf, (double) srate);
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printf("Subframe len: %d samples\n", flen);
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printf("Time advance: %f us\n",time_adv_sec*1e6);
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printf("Set TX/RX rate: %.2f MHz\n", (float) srate / 1000000);
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printf("Set RX gain: %.1f dB\n", srslte_rf_set_rx_gain(&rf, rf_rx_gain));
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printf("Set TX gain: %.1f dB\n", srslte_rf_set_tx_gain(&rf, srslte_rf_tx_gain));
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printf("Set TX/RX freq: %.2f MHz\n", srslte_rf_set_rx_freq(&rf, 0, rf_freq) / 1000000);
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srslte_rf_set_tx_freq(&rf, 0, rf_freq);
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sleep(1);
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if (input_filename) {
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srslte_vec_load_file(input_filename, &tx_buffer[time_adv_samples], flen*sizeof(cf_t));
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} else {
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for (int i=0;i<flen-time_adv_samples;i++) {
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tx_buffer[i+time_adv_samples] = 0.3*cexpf(_Complex_I*2*M_PI*tone_offset_hz*((float) i/(float) srate));
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}
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srslte_vec_save_file("srslte_rf_txrx_tone", tx_buffer, flen*sizeof(cf_t));
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}
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srslte_timestamp_t tstamp;
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srslte_rf_start_rx_stream(&rf, false);
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uint32_t nframe=0;
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while(nframe<nof_frames) {
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printf("Rx subframe %d\n", nframe);
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srslte_rf_recv_with_time(&rf, &rx_buffer[flen*nframe], flen, true, &tstamp.full_secs, &tstamp.frac_secs);
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nframe++;
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if (nframe==9) {
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srslte_timestamp_add(&tstamp, 0, 2e-3-time_adv_sec);
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srslte_rf_send_timed2(&rf, tx_buffer, flen+time_adv_samples, tstamp.full_secs, tstamp.frac_secs, true, true);
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printf("Transmitting Signal\n");
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}
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}
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srslte_vec_save_file(output_filename, &rx_buffer[10*flen], flen*sizeof(cf_t));
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free(tx_buffer);
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free(rx_buffer);
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printf("Done\n");
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exit(0);
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}
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