mirror of https://github.com/PentHertz/srsLTE.git
80 lines
1.9 KiB
C
80 lines
1.9 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 <math.h>
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#include <unistd.h>
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#include "cuhd.h"
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#include "lte/utils/vector.h"
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#include "lte/utils/debug.h"
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int cuhd_rssi_scan(void *uhd, float *freqs, float *rssi, int nof_bands, double fs, int nsamp) {
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int i, j;
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int ret = -1;
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_Complex float *buffer;
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double f;
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buffer = calloc(nsamp, sizeof(_Complex float));
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if (!buffer) {
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goto free_and_exit;
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}
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cuhd_set_rx_gain(uhd, 0.0);
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cuhd_set_rx_srate(uhd, fs);
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for (i=0;i<nof_bands;i++) {
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cuhd_stop_rx_stream(uhd);
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f = (double) freqs[i];
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cuhd_set_rx_freq(uhd, f);
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cuhd_rx_wait_lo_locked(uhd);
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cuhd_start_rx_stream(uhd);
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/* discard first samples */
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for (j=0;j<2;j++) {
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if (cuhd_recv(uhd, buffer, nsamp, 1) != nsamp) {
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goto free_and_exit;
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}
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}
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rssi[i] = vec_avg_power_cf(buffer, nsamp);
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printf("[%3d]: Freq %4.1f Mhz - RSSI: %3.2f dBm\r", i, f/1000000, 10*log10f(rssi[i]) + 30); fflush(stdout);
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if (VERBOSE_ISINFO()) {
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printf("\n");
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}
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}
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cuhd_stop_rx_stream(uhd);
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ret = 0;
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free_and_exit:
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free(buffer);
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return ret;
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}
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