Software to turn the RTL2832U into a SDR receiver
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rtl-sdr/src/convenience/convenience.c

308 lines
6.9 KiB

/*
* Copyright (C) 2014 by Kyle Keen <keenerd@gmail.com>
*
* 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/>.
*/
/* a collection of user friendly tools
* todo: use strtol for more flexible int parsing
* */
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#ifndef _WIN32
#include <unistd.h>
#else
#include <windows.h>
#include <fcntl.h>
#include <io.h>
#define _USE_MATH_DEFINES
#endif
#include <math.h>
#include "rtl-sdr.h"
double atofs(char *s)
/* standard suffixes */
{
char last;
int len;
double suff = 1.0;
len = strlen(s);
last = s[len-1];
s[len-1] = '\0';
switch (last) {
case 'g':
case 'G':
suff *= 1e3;
/* fall-through */
case 'm':
case 'M':
suff *= 1e3;
/* fall-through */
case 'k':
case 'K':
suff *= 1e3;
suff *= atof(s);
s[len-1] = last;
return suff;
}
s[len-1] = last;
return atof(s);
}
double atoft(char *s)
/* time suffixes, returns seconds */
{
char last;
int len;
double suff = 1.0;
len = strlen(s);
last = s[len-1];
s[len-1] = '\0';
switch (last) {
case 'h':
case 'H':
suff *= 60;
/* fall-through */
case 'm':
case 'M':
suff *= 60;
/* fall-through */
case 's':
case 'S':
suff *= atof(s);
s[len-1] = last;
return suff;
}
s[len-1] = last;
return atof(s);
}
double atofp(char *s)
/* percent suffixes */
{
char last;
int len;
double suff = 1.0;
len = strlen(s);
last = s[len-1];
s[len-1] = '\0';
switch (last) {
case '%':
suff *= 0.01;
suff *= atof(s);
s[len-1] = last;
return suff;
}
s[len-1] = last;
return atof(s);
}
int nearest_gain(rtlsdr_dev_t *dev, int target_gain)
{
int i, r, err1, err2, count, nearest;
int* gains;
r = rtlsdr_set_tuner_gain_mode(dev, 1);
if (r < 0) {
fprintf(stderr, "WARNING: Failed to enable manual gain.\n");
return r;
}
count = rtlsdr_get_tuner_gains(dev, NULL);
if (count <= 0) {
return 0;
}
gains = malloc(sizeof(int) * count);
count = rtlsdr_get_tuner_gains(dev, gains);
nearest = gains[0];
for (i=0; i<count; i++) {
err1 = abs(target_gain - nearest);
err2 = abs(target_gain - gains[i]);
if (err2 < err1) {
nearest = gains[i];
}
}
free(gains);
return nearest;
}
int verbose_set_frequency(rtlsdr_dev_t *dev, uint32_t frequency)
{
int r;
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);
}
return r;
}
int verbose_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate)
{
int r;
r = rtlsdr_set_sample_rate(dev, samp_rate);
if (r < 0) {
fprintf(stderr, "WARNING: Failed to set sample rate.\n");
} else {
fprintf(stderr, "Sampling at %u S/s.\n", samp_rate);
}
return r;
}
int verbose_direct_sampling(rtlsdr_dev_t *dev, int on)
{
int r;
r = rtlsdr_set_direct_sampling(dev, on);
if (r != 0) {
fprintf(stderr, "WARNING: Failed to set direct sampling mode.\n");
return r;
}
if (on == 0) {
fprintf(stderr, "Direct sampling mode disabled.\n");}
if (on == 1) {
fprintf(stderr, "Enabled direct sampling mode, input 1/I.\n");}
if (on == 2) {
fprintf(stderr, "Enabled direct sampling mode, input 2/Q.\n");}
return r;
}
int verbose_offset_tuning(rtlsdr_dev_t *dev)
{
int r;
r = rtlsdr_set_offset_tuning(dev, 1);
if (r != 0) {
fprintf(stderr, "WARNING: Failed to set offset tuning.\n");
} else {
fprintf(stderr, "Offset tuning mode enabled.\n");
}
return r;
}
int verbose_auto_gain(rtlsdr_dev_t *dev)
{
int r;
r = rtlsdr_set_tuner_gain_mode(dev, 0);
if (r != 0) {
fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
} else {
fprintf(stderr, "Tuner gain set to automatic.\n");
}
return r;
}
int verbose_gain_set(rtlsdr_dev_t *dev, int gain)
{
int r;
r = rtlsdr_set_tuner_gain_mode(dev, 1);
if (r < 0) {
fprintf(stderr, "WARNING: Failed to enable manual gain.\n");
return r;
}
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 %0.2f dB.\n", gain/10.0);
}
return r;
}
int verbose_ppm_set(rtlsdr_dev_t *dev, int ppm_error)
{
int r;
if (ppm_error == 0) {
return 0;}
r = rtlsdr_set_freq_correction(dev, ppm_error);
if (r < 0) {
fprintf(stderr, "WARNING: Failed to set ppm error.\n");
} else {
fprintf(stderr, "Tuner error set to %i ppm.\n", ppm_error);
}
return r;
}
int verbose_reset_buffer(rtlsdr_dev_t *dev)
{
int r;
r = rtlsdr_reset_buffer(dev);
if (r < 0) {
fprintf(stderr, "WARNING: Failed to reset buffers.\n");}
return r;
}
int verbose_device_search(char *s)
{
int i, device_count, device, offset;
char *s2;
char vendor[256], product[256], serial[256];
device_count = rtlsdr_get_device_count();
if (!device_count) {
fprintf(stderr, "No supported devices found.\n");
return -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");
/* does string look like raw id number */
device = (int)strtol(s, &s2, 0);
if (s2[0] == '\0' && device >= 0 && device < device_count) {
fprintf(stderr, "Using device %d: %s\n",
device, rtlsdr_get_device_name((uint32_t)device));
return device;
}
/* does string exact match a serial */
for (i = 0; i < device_count; i++) {
rtlsdr_get_device_usb_strings(i, vendor, product, serial);
if (strcmp(s, serial) != 0) {
continue;}
device = i;
fprintf(stderr, "Using device %d: %s\n",
device, rtlsdr_get_device_name((uint32_t)device));
return device;
}
/* does string prefix match a serial */
for (i = 0; i < device_count; i++) {
rtlsdr_get_device_usb_strings(i, vendor, product, serial);
if (strncmp(s, serial, strlen(s)) != 0) {
continue;}
device = i;
fprintf(stderr, "Using device %d: %s\n",
device, rtlsdr_get_device_name((uint32_t)device));
return device;
}
/* does string suffix match a serial */
for (i = 0; i < device_count; i++) {
rtlsdr_get_device_usb_strings(i, vendor, product, serial);
offset = strlen(serial) - strlen(s);
if (offset < 0) {
continue;}
if (strncmp(s, serial+offset, strlen(s)) != 0) {
continue;}
device = i;
fprintf(stderr, "Using device %d: %s\n",
device, rtlsdr_get_device_name((uint32_t)device));
return device;
}
fprintf(stderr, "No matching devices found.\n");
return -1;
}
// vim: tabstop=8:softtabstop=8:shiftwidth=8:noexpandtab