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rtl-sdr/src/rtl_test.c

380 lines
8.9 KiB

/*
* rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver
* Copyright (C) 2012 by Steve Markgraf <steve@steve-m.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#ifdef __APPLE__
#include <sys/time.h>
#else
#include <time.h>
#endif
#ifndef _WIN32
#include <unistd.h>
#else
#include <Windows.h>
#include "getopt/getopt.h"
#endif
#include "rtl-sdr.h"
#define DEFAULT_SAMPLE_RATE 2048000
#define DEFAULT_ASYNC_BUF_NUMBER 32
#define DEFAULT_BUF_LENGTH (16 * 16384)
#define MINIMAL_BUF_LENGTH 512
#define MAXIMAL_BUF_LENGTH (256 * 16384)
#define MHZ(x) ((x)*1000*1000)
#define PPM_DURATION 10
static int do_exit = 0;
static rtlsdr_dev_t *dev = NULL;
static int ppm_benchmark = 0;
static int64_t ppm_count = 0L;
static int64_t ppm_total = 0L;
#ifndef _WIN32
static struct timespec ppm_start;
static struct timespec ppm_recent;
static struct timespec ppm_now;
#endif
#ifdef __APPLE__
static struct timeval tv;
#endif
void usage(void)
{
fprintf(stderr,
"rtl_test, a benchmark tool for RTL2832 based DVB-T receivers\n\n"
"Usage:\n"
"\t[-s samplerate (default: 2048000 Hz)]\n"
"\t[-d device_index (default: 0)]\n"
"\t[-t enable Elonics E4000 tuner benchmark]\n"
#ifndef _WIN32
"\t[-p enable PPM error measurement]\n"
#endif
"\t[-b output_block_size (default: 16 * 16384)]\n"
"\t[-S force sync output (default: async)]\n");
exit(1);
}
#ifdef _WIN32
BOOL WINAPI
sighandler(int signum)
{
if (CTRL_C_EVENT == signum) {
fprintf(stderr, "Signal caught, exiting!\n");
do_exit = 1;
rtlsdr_cancel_async(dev);
return TRUE;
}
return FALSE;
}
#else
static void sighandler(int signum)
{
fprintf(stderr, "Signal caught, exiting!\n");
do_exit = 1;
rtlsdr_cancel_async(dev);
}
#endif
uint8_t bcnt, uninit = 1;
static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
{
uint32_t i, lost = 0;
int64_t ns;
if (uninit) {
bcnt = buf[0];
uninit = 0;
}
for (i = 0; i < len; i++) {
if(bcnt != buf[i]) {
lost += (buf[i] > bcnt) ? (buf[i] - bcnt) : (bcnt - buf[i]);
bcnt = buf[i];
}
bcnt++;
}
if (lost)
printf("lost at least %d bytes\n", lost);
if (!ppm_benchmark) {
return;
}
ppm_count += (int64_t)len;
#ifndef _WIN32
#ifndef __APPLE__
clock_gettime(CLOCK_REALTIME, &ppm_now);
#else
gettimeofday(&tv, NULL);
ppm_now.tv_sec = tv.tv_sec;
ppm_now.tv_nsec = tv.tv_usec*1000;
#endif
if (ppm_now.tv_sec - ppm_recent.tv_sec > PPM_DURATION) {
ns = 1000000000L * (int64_t)(ppm_now.tv_sec - ppm_recent.tv_sec);
ns += (int64_t)(ppm_now.tv_nsec - ppm_recent.tv_nsec);
printf("real sample rate: %i\n",
(int)((1000000000L * ppm_count / 2L) / ns));
#ifndef __APPLE__
clock_gettime(CLOCK_REALTIME, &ppm_recent);
#else
gettimeofday(&tv, NULL);
ppm_recent.tv_sec = tv.tv_sec;
ppm_recent.tv_nsec = tv.tv_usec*1000;
#endif
ppm_total += ppm_count / 2L;
ppm_count = 0L;
}
#endif
}
void e4k_benchmark(void)
{
uint32_t freq, gap_start = 0, gap_end = 0;
uint32_t range_start = 0, range_end = 0;
fprintf(stderr, "Benchmarking E4000 PLL...\n");
/* find tuner range start */
for (freq = MHZ(70); freq > MHZ(1); freq -= MHZ(1)) {
if (rtlsdr_set_center_freq(dev, freq) < 0) {
range_start = freq;
break;
}
}
/* find tuner range end */
for (freq = MHZ(2000); freq < MHZ(2300UL); freq += MHZ(1)) {
if (rtlsdr_set_center_freq(dev, freq) < 0) {
range_end = freq;
break;
}
}
/* find start of L-band gap */
for (freq = MHZ(1000); freq < MHZ(1300); freq += MHZ(1)) {
if (rtlsdr_set_center_freq(dev, freq) < 0) {
gap_start = freq;
break;
}
}
/* find end of L-band gap */
for (freq = MHZ(1300); freq > MHZ(1000); freq -= MHZ(1)) {
if (rtlsdr_set_center_freq(dev, freq) < 0) {
gap_end = freq;
break;
}
}
fprintf(stderr, "E4K range: %i to %i MHz\n",
range_start/MHZ(1) + 1, range_end/MHZ(1) - 1);
fprintf(stderr, "E4K L-band gap: %i to %i MHz\n",
gap_start/MHZ(1), gap_end/MHZ(1));
}
int main(int argc, char **argv)
{
#ifndef _WIN32
struct sigaction sigact;
#endif
int n_read;
int r, opt;
int i, tuner_benchmark = 0;
int sync_mode = 0;
uint8_t *buffer;
uint32_t dev_index = 0;
uint32_t samp_rate = DEFAULT_SAMPLE_RATE;
uint32_t out_block_size = DEFAULT_BUF_LENGTH;
int device_count;
int count;
int gains[100];
int real_rate;
int64_t ns;
while ((opt = getopt(argc, argv, "d:s:b:tpS::")) != -1) {
switch (opt) {
case 'd':
dev_index = atoi(optarg);
break;
case 's':
samp_rate = (uint32_t)atof(optarg);
break;
case 'b':
out_block_size = (uint32_t)atof(optarg);
break;
case 't':
tuner_benchmark = 1;
break;
case 'p':
ppm_benchmark = PPM_DURATION;
break;
case 'S':
sync_mode = 1;
break;
default:
usage();
break;
}
}
if(out_block_size < MINIMAL_BUF_LENGTH ||
out_block_size > MAXIMAL_BUF_LENGTH ){
fprintf(stderr,
"Output block size wrong value, falling back to default\n");
fprintf(stderr,
"Minimal length: %u\n", MINIMAL_BUF_LENGTH);
fprintf(stderr,
"Maximal length: %u\n", MAXIMAL_BUF_LENGTH);
out_block_size = DEFAULT_BUF_LENGTH;
}
buffer = malloc(out_block_size * sizeof(uint8_t));
device_count = rtlsdr_get_device_count();
if (!device_count) {
fprintf(stderr, "No supported devices found.\n");
exit(1);
}
fprintf(stderr, "Found %d device(s):\n", device_count);
for (i = 0; i < device_count; i++)
fprintf(stderr, " %d: %s\n", i, rtlsdr_get_device_name(i));
fprintf(stderr, "\n");
fprintf(stderr, "Using device %d: %s\n",
dev_index,
rtlsdr_get_device_name(dev_index));
r = rtlsdr_open(&dev, dev_index);
if (r < 0) {
fprintf(stderr, "Failed to open rtlsdr device #%d.\n", dev_index);
exit(1);
}
#ifndef _WIN32
sigact.sa_handler = sighandler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = 0;
sigaction(SIGINT, &sigact, NULL);
sigaction(SIGTERM, &sigact, NULL);
sigaction(SIGQUIT, &sigact, NULL);
sigaction(SIGPIPE, &sigact, NULL);
#else
SetConsoleCtrlHandler( (PHANDLER_ROUTINE) sighandler, TRUE );
#endif
count = rtlsdr_get_tuner_gains(dev, NULL);
fprintf(stderr, "Supported gain values (%d): ", count);
count = rtlsdr_get_tuner_gains(dev, gains);
for (i = 0; i < count; i++)
fprintf(stderr, "%.1f ", gains[i] / 10.0);
fprintf(stderr, "\n");
/* Set the sample rate */
r = rtlsdr_set_sample_rate(dev, samp_rate);
if (r < 0)
fprintf(stderr, "WARNING: Failed to set sample rate.\n");
if (tuner_benchmark) {
if (rtlsdr_get_tuner_type(dev) == RTLSDR_TUNER_E4000)
e4k_benchmark();
else
fprintf(stderr, "No E4000 tuner found, aborting.\n");
goto exit;
}
/* Enable test mode */
r = rtlsdr_set_testmode(dev, 1);
/* Reset endpoint before we start reading from it (mandatory) */
r = rtlsdr_reset_buffer(dev);
if (r < 0)
fprintf(stderr, "WARNING: Failed to reset buffers.\n");
if (ppm_benchmark && !sync_mode) {
fprintf(stderr, "Reporting PPM error measurement every %i seconds...\n", ppm_benchmark);
fprintf(stderr, "Press ^C after a few minutes.\n");
#ifdef __APPLE__
gettimeofday(&tv, NULL);
ppm_recent.tv_sec = tv.tv_sec;
ppm_recent.tv_nsec = tv.tv_usec*1000;
ppm_start.tv_sec = tv.tv_sec;
ppm_start.tv_nsec = tv.tv_usec*1000;
#elif __unix__
clock_gettime(CLOCK_REALTIME, &ppm_recent);
clock_gettime(CLOCK_REALTIME, &ppm_start);
#endif
}
if (sync_mode) {
fprintf(stderr, "Reading samples in sync mode...\n");
while (!do_exit) {
r = rtlsdr_read_sync(dev, buffer, out_block_size, &n_read);
if (r < 0) {
fprintf(stderr, "WARNING: sync read failed.\n");
break;
}
if ((uint32_t)n_read < out_block_size) {
fprintf(stderr, "Short read, samples lost, exiting!\n");
break;
}
}
} else {
fprintf(stderr, "Reading samples in async mode...\n");
r = rtlsdr_read_async(dev, rtlsdr_callback, NULL,
DEFAULT_ASYNC_BUF_NUMBER, out_block_size);
}
if (do_exit) {
fprintf(stderr, "\nUser cancel, exiting...\n");
if (ppm_benchmark) {
#ifndef _WIN32
ns = 1000000000L * (int64_t)(ppm_recent.tv_sec - ppm_start.tv_sec);
ns += (int64_t)(ppm_recent.tv_nsec - ppm_start.tv_nsec);
real_rate = (int)(ppm_total * 1000000000L / ns);
printf("Cumulative PPM error: %i\n",
(int)round((double)(1000000 * (real_rate - (int)samp_rate)) / (double)samp_rate));
#endif
}
}
else
fprintf(stderr, "\nLibrary error %d, exiting...\n", r);
exit:
rtlsdr_close(dev);
free (buffer);
return r >= 0 ? r : -r;
}