mirror of https://github.com/PentHertz/srsLTE.git
612 lines
16 KiB
C
612 lines
16 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2014 The libLTE 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 libLTE library.
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*
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* libLTE 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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* libLTE 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 <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 <sys/select.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include "liblte/phy/phy.h"
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#include "liblte/rrc/rrc.h"
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#ifndef DISABLE_UHD
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#include "liblte/cuhd/cuhd.h"
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void *uhd;
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#endif
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char *output_file_name = NULL;
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#define LEFT_KEY 68
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#define RIGHT_KEY 67
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#define UP_KEY 65
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#define DOWN_KEY 66
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lte_cell_t cell = {
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6, // nof_prb
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1, // nof_ports
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1, // cell_id
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CPNORM, // cyclic prefix
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R_1, // PHICH resources
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PHICH_NORM // PHICH length
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};
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int net_port = -1; // -1 generates random data
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uint32_t cfi=1;
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uint32_t mcs_idx = 1, last_mcs_idx = 1;
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int nof_frames = -1;
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char *uhd_args = "";
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float uhd_amp = 0.1, uhd_gain = 70.0, uhd_freq = 2400000000;
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bool null_file_sink=false;
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filesink_t fsink;
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lte_fft_t ifft;
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pbch_t pbch;
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pcfich_t pcfich;
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pdcch_t pdcch;
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pdsch_t pdsch;
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pdsch_harq_t harq_process;
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regs_t regs;
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ra_pdsch_t ra_dl;
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cf_t *sf_buffer = NULL, *output_buffer = NULL;
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int sf_n_re, sf_n_samples;
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pthread_t net_thread;
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void *net_thread_fnc(void *arg);
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sem_t net_sem;
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bool net_packet_ready = false;
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netsource_t net_source;
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netsink_t net_sink;
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int prbset_num = 1, last_prbset_num = 1;
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int prbset_orig = 0;
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void usage(char *prog) {
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printf("Usage: %s [agmfoncvpu]\n", prog);
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#ifndef DISABLE_UHD
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printf("\t-a UHD args [Default %s]\n", uhd_args);
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printf("\t-l UHD amplitude [Default %.2f]\n", uhd_amp);
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printf("\t-g UHD TX gain [Default %.2f dB]\n", uhd_gain);
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printf("\t-f UHD TX frequency [Default %.1f MHz]\n", uhd_freq / 1000000);
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#else
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printf("\t UHD is disabled. CUHD library not available\n");
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#endif
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printf("\t-o output_file [Default USRP]\n");
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printf("\t-m MCS index [Default %d]\n", mcs_idx);
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printf("\t-n number of frames [Default %d]\n", nof_frames);
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printf("\t-c cell id [Default %d]\n", cell.id);
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printf("\t-p nof_prb [Default %d]\n", cell.nof_prb);
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printf("\t-u listen UDP port for input data (-1 is random) [Default %d]\n", net_port);
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printf("\t-v [set verbose to debug, default none]\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, "aglfmoncpvu")) != -1) {
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switch (opt) {
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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 'l':
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uhd_amp = atof(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 'o':
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output_file_name = argv[optind];
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break;
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case 'm':
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mcs_idx = atoi(argv[optind]);
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break;
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case 'u':
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net_port = atoi(argv[optind]);
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break;
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case 'n':
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nof_frames = atoi(argv[optind]);
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break;
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case 'p':
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cell.nof_prb = atoi(argv[optind]);
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break;
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case 'c':
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cell.id = atoi(argv[optind]);
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break;
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case 'v':
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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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#ifdef DISABLE_UHD
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if (!output_file_name) {
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usage(argv[0]);
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exit(-1);
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}
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#endif
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}
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void base_init() {
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/* init memory */
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sf_buffer = malloc(sizeof(cf_t) * sf_n_re);
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if (!sf_buffer) {
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perror("malloc");
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exit(-1);
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}
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output_buffer = malloc(sizeof(cf_t) * sf_n_samples);
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if (!output_buffer) {
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perror("malloc");
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exit(-1);
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}
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/* open file or USRP */
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if (output_file_name) {
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if (strcmp(output_file_name, "NULL")) {
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if (filesink_init(&fsink, output_file_name, COMPLEX_FLOAT_BIN)) {
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fprintf(stderr, "Error opening file %s\n", output_file_name);
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exit(-1);
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}
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null_file_sink = false;
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} else {
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null_file_sink = true;
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}
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} else {
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#ifndef DISABLE_UHD
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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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#else
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printf("Error UHD not available. Select an output file\n");
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exit(-1);
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#endif
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}
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if (net_port > 0) {
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if (netsource_init(&net_source, "0.0.0.0", net_port, NETSOURCE_TCP)) {
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fprintf(stderr, "Error creating input UDP socket at port %d\n", net_port);
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exit(-1);
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}
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if (null_file_sink) {
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if (netsink_init(&net_sink, "127.0.0.1", net_port+1, NETSINK_TCP)) {
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fprintf(stderr, "Error sink\n");
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exit(-1);
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}
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}
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if (sem_init(&net_sem, 0, 1)) {
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perror("sem_init");
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exit(-1);
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}
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}
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/* create ifft object */
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if (lte_ifft_init(&ifft, CPNORM, cell.nof_prb)) {
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fprintf(stderr, "Error creating iFFT object\n");
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exit(-1);
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}
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if (pbch_init(&pbch, cell)) {
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fprintf(stderr, "Error creating PBCH object\n");
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exit(-1);
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}
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if (regs_init(®s, cell)) {
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fprintf(stderr, "Error initiating regs\n");
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exit(-1);
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}
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if (pcfich_init(&pcfich, ®s, cell)) {
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fprintf(stderr, "Error creating PBCH object\n");
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exit(-1);
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}
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if (regs_set_cfi(®s, cfi)) {
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fprintf(stderr, "Error setting CFI\n");
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exit(-1);
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}
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if (pdcch_init(&pdcch, ®s, cell)) {
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fprintf(stderr, "Error creating PDCCH object\n");
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exit(-1);
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}
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if (pdsch_init(&pdsch, cell)) {
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fprintf(stderr, "Error creating PDSCH object\n");
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exit(-1);
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}
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pdsch_set_rnti(&pdsch, 1234);
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if (pdsch_harq_init(&harq_process, &pdsch)) {
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fprintf(stderr, "Error initiating HARQ process\n");
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exit(-1);
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}
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}
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void base_free() {
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pdsch_harq_free(&harq_process);
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pdsch_free(&pdsch);
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pdcch_free(&pdcch);
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regs_free(®s);
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pbch_free(&pbch);
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lte_ifft_free(&ifft);
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if (sf_buffer) {
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free(sf_buffer);
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}
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if (output_buffer) {
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free(output_buffer);
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}
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if (output_file_name) {
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if (!null_file_sink) {
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filesink_free(&fsink);
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}
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} else {
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#ifndef DISABLE_UHD
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cuhd_close(&uhd);
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#endif
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}
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if (net_port > 0) {
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netsource_free(&net_source);
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sem_close(&net_sem);
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}
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}
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unsigned int
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reverse(register unsigned int x)
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{
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x = (((x & 0xaaaaaaaa) >> 1) | ((x & 0x55555555) << 1));
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x = (((x & 0xcccccccc) >> 2) | ((x & 0x33333333) << 2));
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x = (((x & 0xf0f0f0f0) >> 4) | ((x & 0x0f0f0f0f) << 4));
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x = (((x & 0xff00ff00) >> 8) | ((x & 0x00ff00ff) << 8));
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return((x >> 16) | (x << 16));
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}
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uint32_t prbset_to_bitmask() {
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uint32_t mask=0;
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for (int i=0;i<cell.nof_prb;i++) {
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if (i >= prbset_orig && i < prbset_orig + prbset_num) {
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mask = mask | (0x1<<i);
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}
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}
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return reverse(mask)>>(32-cell.nof_prb);
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}
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int update_radl() {
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ra_prb_t prb_alloc;
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bzero(&ra_dl, sizeof(ra_pdsch_t));
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ra_dl.harq_process = 0;
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ra_dl.mcs_idx = mcs_idx;
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ra_dl.ndi = 0;
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ra_dl.rv_idx = 0;
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ra_dl.alloc_type = alloc_type0;
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ra_dl.type0_alloc.rbg_bitmask = prbset_to_bitmask();
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ra_prb_get_dl(&prb_alloc, &ra_dl, cell.nof_prb);
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ra_prb_get_re_dl(&prb_alloc, cell.nof_prb, 1, cell.nof_prb<10?(cfi+1):cfi, CPNORM);
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ra_mcs_from_idx_dl(mcs_idx, cell.nof_prb, &ra_dl.mcs);
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ra_pdsch_fprint(stdout, &ra_dl, cell.nof_prb);
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if (pdsch_harq_setup(&harq_process, ra_dl.mcs, &prb_alloc)) {
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fprintf(stderr, "Error configuring HARQ process\n");
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return -1;
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}
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return 0;
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}
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/* Read new MCS from stdin */
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int update_control() {
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char input[128];
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fd_set set;
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FD_ZERO(&set);
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FD_SET(0, &set);
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struct timeval to;
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to.tv_sec = 0;
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to.tv_usec = 0;
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int n = select(1, &set, NULL, NULL, &to);
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if (n == 1) {
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// stdin ready
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if (fgets(input, sizeof(input), stdin)) {
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if(input[0] == 27) {
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switch(input[2]) {
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case RIGHT_KEY:
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if (prbset_orig + prbset_num < cell.nof_prb)
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prbset_orig++;
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break;
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case LEFT_KEY:
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if (prbset_orig > 0)
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prbset_orig--;
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break;
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case UP_KEY:
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if (prbset_num < cell.nof_prb)
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prbset_num++;
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break;
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case DOWN_KEY:
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last_prbset_num = prbset_num;
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if (prbset_num > 0)
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prbset_num--;
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break;
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}
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} else {
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last_mcs_idx = mcs_idx;
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mcs_idx = atoi(input);
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}
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bzero(input,sizeof(input));
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if (update_radl()) {
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printf("Trying with last known MCS index\n");
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mcs_idx = last_mcs_idx;
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prbset_num = last_prbset_num;
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return update_radl();
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}
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}
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return 0;
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} else if (n < 0) {
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// error
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perror("select");
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return -1;
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} else {
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return 0;
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}
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}
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#define DATA_BUFF_SZ 1000
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uint8_t data[8*DATA_BUFF_SZ], data_unpacked[DATA_BUFF_SZ];
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uint8_t data_tmp[DATA_BUFF_SZ];
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/** Function run in a separate thread to receive UDP data */
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void *net_thread_fnc(void *arg) {
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int n;
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int rpm = 0, wpm=0;
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do {
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n = netsource_read(&net_source, &data_unpacked[rpm], DATA_BUFF_SZ-rpm);
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if (n > 0) {
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int nbytes = 1+(ra_dl.mcs.tbs-1)/8;
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rpm += n;
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printf("received %d bytes. rpm=%d/%d\n",n,rpm,nbytes);
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wpm = 0;
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while (rpm >= nbytes) {
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// wait for packet to be transmitted
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sem_wait(&net_sem);
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bit_pack_vector(&data_unpacked[wpm], data, nbytes*8);
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INFO("Sent %d/%d bytes ready\n", nbytes, rpm);
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rpm -= nbytes;
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wpm += nbytes;
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net_packet_ready = true;
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}
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if (wpm > 0) {
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INFO("%d bytes left in buffer for next packet\n", rpm);
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memcpy(data_unpacked, &data_unpacked[wpm], rpm * sizeof(uint8_t));
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}
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} else if (n < 0) {
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fprintf(stderr, "Error receiving from network\n");
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exit(-1);
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}
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} while(n >= 0);
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return NULL;
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}
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int main(int argc, char **argv) {
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int nf, sf_idx, N_id_2;
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cf_t pss_signal[PSS_LEN];
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float sss_signal0[SSS_LEN]; // for subframe 0
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float sss_signal5[SSS_LEN]; // for subframe 5
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uint8_t bch_payload[BCH_PAYLOAD_LEN], bch_payload_packed[BCH_PAYLOAD_LEN/8];
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int i;
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cf_t *sf_symbols[MAX_PORTS];
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cf_t *slot1_symbols[MAX_PORTS];
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dci_msg_t dci_msg;
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dci_location_t locations[NSUBFRAMES_X_FRAME][10];
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uint32_t sfn;
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chest_dl_t est;
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#ifdef DISABLE_UHD
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if (argc < 3) {
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usage(argv[0]);
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exit(-1);
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}
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#endif
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parse_args(argc, argv);
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N_id_2 = cell.id % 3;
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sf_n_re = 2 * CPNORM_NSYMB * cell.nof_prb * RE_X_RB;
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sf_n_samples = 2 * SLOT_LEN(lte_symbol_sz(cell.nof_prb));
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cell.phich_length = PHICH_NORM;
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cell.phich_resources = R_1;
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sfn = 0;
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prbset_num = cell.nof_prb;
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last_prbset_num = cell.nof_prb;
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/* this *must* be called after setting slot_len_* */
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base_init();
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/* Generate PSS/SSS signals */
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pss_generate(pss_signal, N_id_2);
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sss_generate(sss_signal0, sss_signal5, cell.id);
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/* Generate CRS signals */
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if (chest_dl_init(&est, cell)) {
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fprintf(stderr, "Error initializing equalizer\n");
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exit(-1);
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}
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for (i = 0; i < MAX_PORTS; i++) { // now there's only 1 port
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sf_symbols[i] = sf_buffer;
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slot1_symbols[i] = &sf_buffer[SLOT_LEN_RE(cell.nof_prb, cell.cp)];
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}
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#ifndef DISABLE_UHD
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if (!output_file_name) {
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printf("Set TX rate: %.2f MHz\n",
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cuhd_set_tx_srate(uhd, lte_sampling_freq_hz(cell.nof_prb)) / 1000000);
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printf("Set TX gain: %.1f dB\n", cuhd_set_tx_gain(uhd, uhd_gain));
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printf("Set TX freq: %.2f MHz\n",
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cuhd_set_tx_freq(uhd, uhd_freq) / 1000000);
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}
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#endif
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if (update_radl()) {
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exit(-1);
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}
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if (net_port > 0) {
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if (pthread_create(&net_thread, NULL, net_thread_fnc, NULL)) {
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perror("pthread_create");
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exit(-1);
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}
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}
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/* Initiate valid DCI locations */
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for (i=0;i<NSUBFRAMES_X_FRAME;i++) {
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pdcch_ue_locations(&pdcch, locations[i], 10, i, cfi, 1234);
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}
|
|
|
|
nf = 0;
|
|
|
|
bool send_data = false;
|
|
|
|
while (nf < nof_frames || nof_frames == -1) {
|
|
for (sf_idx = 0; sf_idx < NSUBFRAMES_X_FRAME && (nf < nof_frames || nof_frames == -1); sf_idx++) {
|
|
bzero(sf_buffer, sizeof(cf_t) * sf_n_re);
|
|
|
|
if (sf_idx == 0 || sf_idx == 5) {
|
|
pss_put_slot(pss_signal, sf_buffer, cell.nof_prb, CPNORM);
|
|
sss_put_slot(sf_idx ? sss_signal5 : sss_signal0, sf_buffer, cell.nof_prb,
|
|
CPNORM);
|
|
}
|
|
|
|
refsignal_cs_put_sf(cell, 0, est.csr_signal.pilots[0][sf_idx], sf_buffer);
|
|
|
|
bcch_bch_pack(&cell, sfn, bch_payload_packed, BCH_PAYLOAD_LEN/8);
|
|
bit_pack_vector(bch_payload_packed, bch_payload, BCH_PAYLOAD_LEN);
|
|
if (sf_idx == 0) {
|
|
pbch_encode(&pbch, bch_payload, slot1_symbols);
|
|
}
|
|
|
|
pcfich_encode(&pcfich, cfi, sf_symbols, sf_idx);
|
|
|
|
/* Update DL resource allocation from control port */
|
|
if (update_control(&ra_dl)) {
|
|
fprintf(stderr, "Error updating parameters from control port\n");
|
|
}
|
|
|
|
/* Transmit PDCCH + PDSCH only when there is data to send */
|
|
if (sf_idx != 0 && sf_idx != 5) {
|
|
if (net_port > 0) {
|
|
send_data = net_packet_ready;
|
|
if (net_packet_ready) {
|
|
INFO("Transmitting packet\n",0);
|
|
}
|
|
} else {
|
|
INFO("SF: %d, Generating %d random bits\n", sf_idx, ra_dl.mcs.tbs);
|
|
for (i=0;i<ra_dl.mcs.tbs;i++) {
|
|
data[i] = rand()%2;
|
|
}
|
|
send_data = true;
|
|
}
|
|
} else {
|
|
send_data = false;
|
|
}
|
|
|
|
if (send_data) {
|
|
dci_msg_pack_pdsch(&ra_dl, &dci_msg, Format1, cell.nof_prb, false);
|
|
INFO("Putting DCI to location: n=%d, L=%d\n", locations[sf_idx][0].ncce, locations[sf_idx][0].L);
|
|
if (pdcch_encode(&pdcch, &dci_msg, locations[sf_idx][0], 1234, sf_symbols, sf_idx, cfi)) {
|
|
fprintf(stderr, "Error encoding DCI message\n");
|
|
exit(-1);
|
|
}
|
|
|
|
if (pdsch_encode(&pdsch, data, sf_symbols, sf_idx, &harq_process, ra_dl.rv_idx)) {
|
|
fprintf(stderr, "Error encoding PDSCH\n");
|
|
exit(-1);
|
|
}
|
|
if (net_port > 0 && net_packet_ready) {
|
|
if (null_file_sink) {
|
|
bit_unpack_vector(data, data_tmp, ra_dl.mcs.tbs);
|
|
if (netsink_write(&net_sink, data_tmp, 1+(ra_dl.mcs.tbs-1)/8) < 0) {
|
|
fprintf(stderr, "Error sending data through UDP socket\n");
|
|
}
|
|
}
|
|
net_packet_ready = false;
|
|
sem_post(&net_sem);
|
|
}
|
|
}
|
|
|
|
/* Transform to OFDM symbols */
|
|
lte_ifft_run_sf(&ifft, sf_buffer, output_buffer);
|
|
|
|
/* send to file or usrp */
|
|
if (output_file_name) {
|
|
if (!null_file_sink) {
|
|
filesink_write(&fsink, output_buffer, sf_n_samples);
|
|
}
|
|
usleep(1000);
|
|
} else {
|
|
#ifndef DISABLE_UHD
|
|
vec_sc_prod_cfc(output_buffer, uhd_amp, output_buffer, sf_n_samples);
|
|
cuhd_send(uhd, output_buffer, sf_n_samples, true);
|
|
#endif
|
|
}
|
|
nf++;
|
|
}
|
|
sfn = (sfn + 1) % 1024;
|
|
printf("SFN: %4d\tType new MCS index and press Enter\r", sfn);
|
|
fflush(stdout);
|
|
}
|
|
|
|
base_free();
|
|
|
|
printf("Done\n");
|
|
exit(0);
|
|
}
|
|
|
|
|