102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
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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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* 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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