This tool allows to check for lost samples (and thus check the USB connection), as well as benchmark the Elonics E4000 tunable range. (-t switch) Signed-off-by: Steve Markgraf <steve@steve-m.de>master
Steve Markgraf
13 years ago
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73f54be2ed
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/*
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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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#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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#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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static int do_exit = 0; |
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static rtlsdr_dev_t *dev = NULL; |
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void usage(void) |
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{ |
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#ifdef _WIN32 |
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fprintf(stderr,"rtl-sdr, an I/Q recorder for RTL2832 based USB-sticks\n\n" |
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"Usage:\t rtl-sdr-win.exe [device_index] [samplerate in kHz] " |
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"[gain] [frequency in Hz] [filename]\n"); |
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#else |
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fprintf(stderr, |
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"rtl_test, librtlsdr test tool\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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"\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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#endif |
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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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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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} |
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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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#ifndef _WIN32 |
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while ((opt = getopt(argc, argv, "d:s:b:tS::")) != -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 '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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#else |
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/* TODO fix win usage */ |
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if (argc < 2) |
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usage(); |
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dev_index = atoi(argv[1]); |
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samp_rate = atoi(argv[2])*1000; |
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#endif |
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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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/* 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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e4k_benchmark(); |
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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 (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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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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out: |
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return r >= 0 ? r : -r; |
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} |
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