mirror of
https://github.com/rtlsdrblog/rtl-sdr-blog.git
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43b257854c
This is an import of the rtl_biast command line tool from the rtlsdrblog github repository. It's easier to include it here than try to package up the separate application because they both wish to install dynamic libraries.
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*
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* rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver
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* rtl_biast, tool to set bias tee gpio output
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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 <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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#include "getopt/getopt.h"
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#endif
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#include "rtl-sdr.h"
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#include "convenience/convenience.h"
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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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fprintf(stderr,
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"rtl_biast, a tool for turning the RTL-SDR.com \n"
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"bias tee or any GPIO ON and OFF. Example to turn on the \n"
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"bias tee: rtl_biast -d 0 -b 1\n"
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"Any GPIO: rtl_biast -d 0 -g 1 -b 1\n\n"
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"Usage:\n"
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"\t[-d device_index (default: 0)]\n"
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"\t[-b bias_on (default: 0)]\n"
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"\t[-g GPIO select (default: 0)]\n");
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int i, r, opt;
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int dev_index = 0;
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int dev_given = 0;
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uint32_t bias_on = 0;
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uint32_t gpio_pin = 0;
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int device_count;
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while ((opt = getopt(argc, argv, "d:b:g:h?")) != -1) {
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switch (opt) {
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case 'd':
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dev_index = verbose_device_search(optarg);
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dev_given = 1;
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break;
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case 'b':
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bias_on = atoi(optarg);
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break;
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case 'g':
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gpio_pin = atoi(optarg);
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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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if (!dev_given) {
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dev_index = verbose_device_search("0");
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}
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if (dev_index < 0) {
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exit(1);
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}
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r = rtlsdr_open(&dev, dev_index);
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rtlsdr_set_bias_tee_gpio(dev, gpio_pin, bias_on);
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exit:
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/*
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* Note - rtlsdr_close() in this tree does not clear the bias tee
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* GPIO line, so it leaves the bias tee enabled if a client program
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* doesn't explictly disable it.
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*
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* If that behaviour changes then another rtlsdr_close() will be
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* needed that takes some extension flags, and one of them should
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* be to either explicitly close the biast or leave it alone.
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*/
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rtlsdr_close(dev);
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return r >= 0 ? r : -r;
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}
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