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379 lines
8.9 KiB
379 lines
8.9 KiB
/*
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* rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver
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* Copyright (C) 2012 by Steve Markgraf <steve@steve-m.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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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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#ifdef __APPLE__
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#include <sys/time.h>
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#else
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#include <time.h>
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#endif
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#ifndef _WIN32
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#include <unistd.h>
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#else
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#include <Windows.h>
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#include "getopt/getopt.h"
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#endif
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#include "rtl-sdr.h"
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#define DEFAULT_SAMPLE_RATE 2048000
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#define DEFAULT_ASYNC_BUF_NUMBER 32
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#define DEFAULT_BUF_LENGTH (16 * 16384)
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#define MINIMAL_BUF_LENGTH 512
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#define MAXIMAL_BUF_LENGTH (256 * 16384)
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#define MHZ(x) ((x)*1000*1000)
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#define PPM_DURATION 10
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static int do_exit = 0;
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static rtlsdr_dev_t *dev = NULL;
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static int ppm_benchmark = 0;
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static int64_t ppm_count = 0L;
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static int64_t ppm_total = 0L;
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#ifndef _WIN32
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static struct timespec ppm_start;
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static struct timespec ppm_recent;
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static struct timespec ppm_now;
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#endif
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#ifdef __APPLE__
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static struct timeval tv;
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#endif
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void usage(void)
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{
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fprintf(stderr,
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"rtl_test, a benchmark tool for RTL2832 based DVB-T receivers\n\n"
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"Usage:\n"
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"\t[-s samplerate (default: 2048000 Hz)]\n"
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"\t[-d device_index (default: 0)]\n"
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"\t[-t enable Elonics E4000 tuner benchmark]\n"
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#ifndef _WIN32
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"\t[-p enable PPM error measurement]\n"
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#endif
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"\t[-b output_block_size (default: 16 * 16384)]\n"
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"\t[-S force sync output (default: async)]\n");
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exit(1);
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}
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#ifdef _WIN32
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BOOL WINAPI
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sighandler(int signum)
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{
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if (CTRL_C_EVENT == signum) {
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fprintf(stderr, "Signal caught, exiting!\n");
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do_exit = 1;
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rtlsdr_cancel_async(dev);
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return TRUE;
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}
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return FALSE;
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}
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#else
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static void sighandler(int signum)
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{
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fprintf(stderr, "Signal caught, exiting!\n");
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do_exit = 1;
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rtlsdr_cancel_async(dev);
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}
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#endif
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uint8_t bcnt, uninit = 1;
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static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
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{
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uint32_t i, lost = 0;
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int64_t ns;
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if (uninit) {
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bcnt = buf[0];
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uninit = 0;
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}
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for (i = 0; i < len; i++) {
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if(bcnt != buf[i]) {
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lost += (buf[i] > bcnt) ? (buf[i] - bcnt) : (bcnt - buf[i]);
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bcnt = buf[i];
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}
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bcnt++;
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}
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if (lost)
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printf("lost at least %d bytes\n", lost);
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if (!ppm_benchmark) {
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return;
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}
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ppm_count += (int64_t)len;
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#ifndef _WIN32
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#ifndef __APPLE__
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clock_gettime(CLOCK_REALTIME, &ppm_now);
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#else
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gettimeofday(&tv, NULL);
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ppm_now.tv_sec = tv.tv_sec;
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ppm_now.tv_nsec = tv.tv_usec*1000;
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#endif
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if (ppm_now.tv_sec - ppm_recent.tv_sec > PPM_DURATION) {
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ns = 1000000000L * (int64_t)(ppm_now.tv_sec - ppm_recent.tv_sec);
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ns += (int64_t)(ppm_now.tv_nsec - ppm_recent.tv_nsec);
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printf("real sample rate: %i\n",
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(int)((1000000000L * ppm_count / 2L) / ns));
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#ifndef __APPLE__
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clock_gettime(CLOCK_REALTIME, &ppm_recent);
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#else
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gettimeofday(&tv, NULL);
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ppm_recent.tv_sec = tv.tv_sec;
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ppm_recent.tv_nsec = tv.tv_usec*1000;
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#endif
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ppm_total += ppm_count / 2L;
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ppm_count = 0L;
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}
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#endif
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}
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void e4k_benchmark(void)
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{
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uint32_t freq, gap_start = 0, gap_end = 0;
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uint32_t range_start = 0, range_end = 0;
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fprintf(stderr, "Benchmarking E4000 PLL...\n");
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/* find tuner range start */
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for (freq = MHZ(70); freq > MHZ(1); freq -= MHZ(1)) {
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if (rtlsdr_set_center_freq(dev, freq) < 0) {
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range_start = freq;
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break;
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}
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}
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/* find tuner range end */
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for (freq = MHZ(2000); freq < MHZ(2300UL); freq += MHZ(1)) {
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if (rtlsdr_set_center_freq(dev, freq) < 0) {
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range_end = freq;
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break;
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}
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}
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/* find start of L-band gap */
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for (freq = MHZ(1000); freq < MHZ(1300); freq += MHZ(1)) {
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if (rtlsdr_set_center_freq(dev, freq) < 0) {
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gap_start = freq;
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break;
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}
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}
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/* find end of L-band gap */
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for (freq = MHZ(1300); freq > MHZ(1000); freq -= MHZ(1)) {
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if (rtlsdr_set_center_freq(dev, freq) < 0) {
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gap_end = freq;
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break;
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}
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}
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fprintf(stderr, "E4K range: %i to %i MHz\n",
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range_start/MHZ(1) + 1, range_end/MHZ(1) - 1);
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fprintf(stderr, "E4K L-band gap: %i to %i MHz\n",
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gap_start/MHZ(1), gap_end/MHZ(1));
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}
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int main(int argc, char **argv)
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{
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#ifndef _WIN32
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struct sigaction sigact;
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#endif
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int n_read;
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int r, opt;
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int i, tuner_benchmark = 0;
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int sync_mode = 0;
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uint8_t *buffer;
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uint32_t dev_index = 0;
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uint32_t samp_rate = DEFAULT_SAMPLE_RATE;
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uint32_t out_block_size = DEFAULT_BUF_LENGTH;
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int device_count;
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int count;
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int gains[100];
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int real_rate;
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int64_t ns;
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while ((opt = getopt(argc, argv, "d:s:b:tpS::")) != -1) {
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switch (opt) {
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case 'd':
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dev_index = atoi(optarg);
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break;
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case 's':
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samp_rate = (uint32_t)atof(optarg);
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break;
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case 'b':
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out_block_size = (uint32_t)atof(optarg);
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break;
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case 't':
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tuner_benchmark = 1;
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break;
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case 'p':
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ppm_benchmark = PPM_DURATION;
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break;
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case 'S':
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sync_mode = 1;
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break;
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default:
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usage();
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break;
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}
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}
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if(out_block_size < MINIMAL_BUF_LENGTH ||
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out_block_size > MAXIMAL_BUF_LENGTH ){
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fprintf(stderr,
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"Output block size wrong value, falling back to default\n");
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fprintf(stderr,
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"Minimal length: %u\n", MINIMAL_BUF_LENGTH);
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fprintf(stderr,
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"Maximal length: %u\n", MAXIMAL_BUF_LENGTH);
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out_block_size = DEFAULT_BUF_LENGTH;
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}
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buffer = malloc(out_block_size * sizeof(uint8_t));
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device_count = rtlsdr_get_device_count();
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if (!device_count) {
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fprintf(stderr, "No supported devices found.\n");
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exit(1);
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}
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fprintf(stderr, "Found %d device(s):\n", device_count);
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for (i = 0; i < device_count; i++)
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fprintf(stderr, " %d: %s\n", i, rtlsdr_get_device_name(i));
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fprintf(stderr, "\n");
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fprintf(stderr, "Using device %d: %s\n",
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dev_index,
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rtlsdr_get_device_name(dev_index));
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r = rtlsdr_open(&dev, dev_index);
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if (r < 0) {
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fprintf(stderr, "Failed to open rtlsdr device #%d.\n", dev_index);
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exit(1);
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}
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#ifndef _WIN32
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sigact.sa_handler = sighandler;
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = 0;
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sigaction(SIGINT, &sigact, NULL);
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sigaction(SIGTERM, &sigact, NULL);
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sigaction(SIGQUIT, &sigact, NULL);
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sigaction(SIGPIPE, &sigact, NULL);
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#else
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SetConsoleCtrlHandler( (PHANDLER_ROUTINE) sighandler, TRUE );
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#endif
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count = rtlsdr_get_tuner_gains(dev, NULL);
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fprintf(stderr, "Supported gain values (%d): ", count);
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count = rtlsdr_get_tuner_gains(dev, gains);
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for (i = 0; i < count; i++)
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fprintf(stderr, "%.1f ", gains[i] / 10.0);
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fprintf(stderr, "\n");
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/* Set the sample rate */
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r = rtlsdr_set_sample_rate(dev, samp_rate);
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if (r < 0)
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fprintf(stderr, "WARNING: Failed to set sample rate.\n");
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if (tuner_benchmark) {
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if (rtlsdr_get_tuner_type(dev) == RTLSDR_TUNER_E4000)
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e4k_benchmark();
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else
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fprintf(stderr, "No E4000 tuner found, aborting.\n");
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goto exit;
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}
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/* Enable test mode */
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r = rtlsdr_set_testmode(dev, 1);
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/* Reset endpoint before we start reading from it (mandatory) */
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r = rtlsdr_reset_buffer(dev);
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if (r < 0)
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fprintf(stderr, "WARNING: Failed to reset buffers.\n");
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if (ppm_benchmark && !sync_mode) {
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fprintf(stderr, "Reporting PPM error measurement every %i seconds...\n", ppm_benchmark);
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fprintf(stderr, "Press ^C after a few minutes.\n");
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#ifdef __APPLE__
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gettimeofday(&tv, NULL);
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ppm_recent.tv_sec = tv.tv_sec;
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ppm_recent.tv_nsec = tv.tv_usec*1000;
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ppm_start.tv_sec = tv.tv_sec;
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ppm_start.tv_nsec = tv.tv_usec*1000;
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#elif __unix__
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clock_gettime(CLOCK_REALTIME, &ppm_recent);
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clock_gettime(CLOCK_REALTIME, &ppm_start);
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#endif
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}
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if (sync_mode) {
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fprintf(stderr, "Reading samples in sync mode...\n");
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while (!do_exit) {
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r = rtlsdr_read_sync(dev, buffer, out_block_size, &n_read);
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if (r < 0) {
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fprintf(stderr, "WARNING: sync read failed.\n");
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break;
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}
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if ((uint32_t)n_read < out_block_size) {
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fprintf(stderr, "Short read, samples lost, exiting!\n");
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break;
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}
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}
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} else {
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fprintf(stderr, "Reading samples in async mode...\n");
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r = rtlsdr_read_async(dev, rtlsdr_callback, NULL,
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DEFAULT_ASYNC_BUF_NUMBER, out_block_size);
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}
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if (do_exit) {
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fprintf(stderr, "\nUser cancel, exiting...\n");
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if (ppm_benchmark) {
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#ifndef _WIN32
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ns = 1000000000L * (int64_t)(ppm_recent.tv_sec - ppm_start.tv_sec);
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ns += (int64_t)(ppm_recent.tv_nsec - ppm_start.tv_nsec);
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real_rate = (int)(ppm_total * 1000000000L / ns);
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printf("Cumulative PPM error: %i\n",
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(int)round((double)(1000000 * (real_rate - (int)samp_rate)) / (double)samp_rate));
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#endif
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}
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}
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else
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fprintf(stderr, "\nLibrary error %d, exiting...\n", r);
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exit:
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rtlsdr_close(dev);
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free (buffer);
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return r >= 0 ? r : -r;
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}
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