+++ /dev/null
-/*
- * 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>
-
-#ifndef _WIN32
-#include <unistd.h>
-#else
-#include <Windows.h>
-#include <io.h>
-#include <fcntl.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)
-
-static int do_exit = 0;
-static uint32_t bytes_to_read = 0;
-static rtlsdr_dev_t *dev = NULL;
-
-void usage(void)
-{
- fprintf(stderr,
- "rtl_sdr, an I/Q recorder for RTL2832 based DVB-T receivers\n\n"
- "Usage:\t -f frequency_to_tune_to [Hz]\n"
- "\t[-s samplerate (default: 2048000 Hz)]\n"
- "\t[-d device_index (default: 0)]\n"
- "\t[-g gain (default: 0 for auto)]\n"
- "\t[-b output_block_size (default: 16 * 16384)]\n"
- "\t[-n number of samples to read (default: 0, infinite)]\n"
- "\t[-S force sync output (default: async)]\n"
- "\tfilename (a '-' dumps samples to stdout)\n\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
-
-static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
-{
- if (ctx) {
- if (do_exit)
- return;
-
- if ((bytes_to_read > 0) && (bytes_to_read < len)) {
- len = bytes_to_read;
- do_exit = 1;
- rtlsdr_cancel_async(dev);
- }
-
- if (fwrite(buf, 1, len, (FILE*)ctx) != len) {
- fprintf(stderr, "Short write, samples lost, exiting!\n");
- rtlsdr_cancel_async(dev);
- }
-
- if (bytes_to_read > 0)
- bytes_to_read -= len;
- }
-}
-
-int main(int argc, char **argv)
-{
-#ifndef _WIN32
- struct sigaction sigact;
-#endif
- char *filename = NULL;
- int n_read;
- int r, opt;
- int i, gain = 0;
- int sync_mode = 0;
- FILE *file;
- uint8_t *buffer;
- uint32_t dev_index = 0;
- uint32_t frequency = 100000000;
- uint32_t samp_rate = DEFAULT_SAMPLE_RATE;
- uint32_t out_block_size = DEFAULT_BUF_LENGTH;
- int device_count;
- char vendor[256], product[256], serial[256];
-
- while ((opt = getopt(argc, argv, "d:f:g:s:b:n:S::")) != -1) {
- switch (opt) {
- case 'd':
- dev_index = atoi(optarg);
- break;
- case 'f':
- frequency = (uint32_t)atof(optarg);
- break;
- case 'g':
- gain = (int)(atof(optarg) * 10); /* tenths of a dB */
- break;
- case 's':
- samp_rate = (uint32_t)atof(optarg);
- break;
- case 'b':
- out_block_size = (uint32_t)atof(optarg);
- break;
- case 'n':
- bytes_to_read = (uint32_t)atof(optarg) * 2;
- break;
- case 'S':
- sync_mode = 1;
- break;
- default:
- usage();
- break;
- }
- }
-
- if (argc <= optind) {
- usage();
- } else {
- filename = argv[optind];
- }
-
- 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++) {
- rtlsdr_get_device_usb_strings(i, vendor, product, serial);
- fprintf(stderr, " %d: %s, %s, SN: %s\n", i, vendor, product, serial);
- }
- 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
- /* Set the sample rate */
- r = rtlsdr_set_sample_rate(dev, samp_rate);
- if (r < 0)
- fprintf(stderr, "WARNING: Failed to set sample rate.\n");
-
- /* Set the frequency */
- r = rtlsdr_set_center_freq(dev, frequency);
- if (r < 0)
- fprintf(stderr, "WARNING: Failed to set center freq.\n");
- else
- fprintf(stderr, "Tuned to %u Hz.\n", frequency);
-
- if (0 == gain) {
- /* Enable automatic gain */
- r = rtlsdr_set_tuner_gain_mode(dev, 0);
- if (r < 0)
- fprintf(stderr, "WARNING: Failed to enable automatic gain.\n");
- } else {
- /* Enable manual gain */
- r = rtlsdr_set_tuner_gain_mode(dev, 1);
- if (r < 0)
- fprintf(stderr, "WARNING: Failed to enable manual gain.\n");
-
- /* Set the tuner gain */
- r = rtlsdr_set_tuner_gain(dev, gain);
- if (r < 0)
- fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
- else
- fprintf(stderr, "Tuner gain set to %f dB.\n", gain/10.0);
- }
-
- if(strcmp(filename, "-") == 0) { /* Write samples to stdout */
- file = stdout;
-#ifdef _WIN32
- _setmode(_fileno(stdin), _O_BINARY);
-#endif
- } else {
- file = fopen(filename, "wb");
- if (!file) {
- fprintf(stderr, "Failed to open %s\n", filename);
- goto out;
- }
- }
-
- /* 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 (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 ((bytes_to_read > 0) && (bytes_to_read < (uint32_t)n_read)) {
- n_read = bytes_to_read;
- do_exit = 1;
- }
-
- if (fwrite(buffer, 1, n_read, file) != (size_t)n_read) {
- fprintf(stderr, "Short write, samples lost, exiting!\n");
- break;
- }
-
- if ((uint32_t)n_read < out_block_size) {
- fprintf(stderr, "Short read, samples lost, exiting!\n");
- break;
- }
-
- if (bytes_to_read > 0)
- bytes_to_read -= n_read;
- }
- } else {
- fprintf(stderr, "Reading samples in async mode...\n");
- r = rtlsdr_read_async(dev, rtlsdr_callback, (void *)file,
- DEFAULT_ASYNC_BUF_NUMBER, out_block_size);
- }
-
- if (do_exit)
- fprintf(stderr, "\nUser cancel, exiting...\n");
- else
- fprintf(stderr, "\nLibrary error %d, exiting...\n", r);
-
- if (file != stdout)
- fclose(file);
-
- rtlsdr_close(dev);
- free (buffer);
-out:
- return r >= 0 ? r : -r;
-}
projects / rtl-433.git / blobdiff