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

101 lines
2.5 KiB

/*
* rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver
* rtl_biast, tool to set bias tee gpio output
* 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 <string.h>
#include <stdio.h>
#include <stdlib.h>
#ifndef _WIN32
#include <unistd.h>
#else
#include <windows.h>
#include "getopt/getopt.h"
#endif
#include "rtl-sdr.h"
#include "convenience/convenience.h"
static rtlsdr_dev_t *dev = NULL;
void usage(void)
{
fprintf(stderr,
"rtl_biast, a tool for turning the RTL-SDR.com \n"
"bias tee or any GPIO ON and OFF. Example to turn on the \n"
"bias tee: rtl_biast -d 0 -b 1\n"
"Any GPIO: rtl_biast -d 0 -g 1 -b 1\n\n"
"Usage:\n"
"\t[-d device_index (default: 0)]\n"
"\t[-b bias_on (default: 0)]\n"
"\t[-g GPIO select (default: 0)]\n");
exit(1);
}
int main(int argc, char **argv)
{
int i, r, opt;
int dev_index = 0;
int dev_given = 0;
uint32_t bias_on = 0;
uint32_t gpio_pin = 0;
int device_count;
while ((opt = getopt(argc, argv, "d:b:g:h?")) != -1) {
switch (opt) {
case 'd':
dev_index = verbose_device_search(optarg);
dev_given = 1;
break;
case 'b':
bias_on = atoi(optarg);
break;
case 'g':
gpio_pin = atoi(optarg);
break;
default:
usage();
break;
}
}
if (!dev_given) {
dev_index = verbose_device_search("0");
}
if (dev_index < 0) {
exit(1);
}
r = rtlsdr_open(&dev, dev_index);
rtlsdr_set_bias_tee_gpio(dev, gpio_pin, bias_on);
exit:
/*
* Note - rtlsdr_close() in this tree does not clear the bias tee
* GPIO line, so it leaves the bias tee enabled if a client program
* doesn't explictly disable it.
*
* If that behaviour changes then another rtlsdr_close() will be
* needed that takes some extension flags, and one of them should
* be to either explicitly close the biast or leave it alone.
*/
rtlsdr_close(dev);
return r >= 0 ? r : -r;
}