mirror of
https://github.com/rtlsdrblog/rtl-sdr-blog.git
synced 2024-12-27 03:18:30 +01:00
add new tool: rtl_power
Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Kyle Keen
Steve Markgraf
parent
53775a2ebf
commit
dbc49549a0
@ -42,6 +42,9 @@ AC_CHECK_LIB(m, atan2, [LIBS="$LIBS -lm"])
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dnl libmath (for rtl_adsb)
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AC_CHECK_LIB(m, sqrt, [LIBS="$LIBS -lm"])
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dnl libmath (for rtl_power)
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AC_CHECK_LIB(m, atan2, [LIBS="$LIBS -lm"])
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dnl librealtime (for rtl_test)
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AC_CHECK_LIB(rt, clock_gettime, [LIBS="$LIBS -lrt"])
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@ -73,7 +73,8 @@ add_executable(rtl_test rtl_test.c)
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add_executable(rtl_fm rtl_fm.c)
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add_executable(rtl_eeprom rtl_eeprom.c)
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add_executable(rtl_adsb rtl_adsb.c)
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set(INSTALL_TARGETS rtlsdr_shared rtlsdr_static rtl_sdr rtl_tcp rtl_test rtl_fm rtl_eeprom rtl_adsb)
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add_executable(rtl_power rtl_power.c)
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set(INSTALL_TARGETS rtlsdr_shared rtlsdr_static rtl_sdr rtl_tcp rtl_test rtl_fm rtl_eeprom rtl_adsb rtl_power)
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target_link_libraries(rtl_sdr rtlsdr_shared
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${LIBUSB_LIBRARIES}
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@ -99,9 +100,14 @@ target_link_libraries(rtl_adsb rtlsdr_shared
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${LIBUSB_LIBRARIES}
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${CMAKE_THREAD_LIBS_INIT}
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)
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target_link_libraries(rtl_power rtlsdr_shared
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${LIBUSB_LIBRARIES}
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${CMAKE_THREAD_LIBS_INIT}
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)
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if(UNIX)
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target_link_libraries(rtl_fm m)
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target_link_libraries(rtl_adsb m)
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target_link_libraries(rtl_power m)
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if(APPLE)
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target_link_libraries(rtl_test m)
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else()
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@ -116,12 +122,14 @@ target_link_libraries(rtl_test libgetopt_static)
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target_link_libraries(rtl_fm libgetopt_static)
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target_link_libraries(rtl_eeprom libgetopt_static)
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target_link_libraries(rtl_adsb libgetopt_static)
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target_link_libraries(rtl_power libgetopt_static)
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set_property(TARGET rtl_sdr APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
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set_property(TARGET rtl_tcp APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
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set_property(TARGET rtl_test APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
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set_property(TARGET rtl_fm APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
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set_property(TARGET rtl_eeprom APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
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set_property(TARGET rtl_adsb APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
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set_property(TARGET rtl_power APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
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endif()
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########################################################################
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# Install built library files & utilities
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@ -10,7 +10,7 @@ lib_LTLIBRARIES = librtlsdr.la
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librtlsdr_la_SOURCES = librtlsdr.c tuner_e4k.c tuner_fc0012.c tuner_fc0013.c tuner_fc2580.c tuner_r820t.c
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librtlsdr_la_LDFLAGS = -version-info $(LIBVERSION)
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bin_PROGRAMS = rtl_sdr rtl_tcp rtl_test rtl_fm rtl_eeprom rtl_adsb
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bin_PROGRAMS = rtl_sdr rtl_tcp rtl_test rtl_fm rtl_eeprom rtl_adsb rtl_power
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rtl_sdr_SOURCES = rtl_sdr.c
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rtl_sdr_LDADD = librtlsdr.la
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@ -29,3 +29,6 @@ rtl_eeprom_LDADD = librtlsdr.la $(LIBM)
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rtl_adsb_SOURCES = rtl_adsb.c
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rtl_adsb_LDADD = librtlsdr.la $(LIBM)
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rtl_power_SOURCES = rtl_power.c
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rtl_power_LDADD = librtlsdr.la $(LIBM)
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870
src/rtl_power.c
Normal file
870
src/rtl_power.c
Normal file
@ -0,0 +1,870 @@
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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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* Copyright (C) 2012 by Steve Markgraf <steve@steve-m.de>
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* Copyright (C) 2012 by Hoernchen <la@tfc-server.de>
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* Copyright (C) 2012 by Kyle Keen <keenerd@gmail.com>
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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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/*
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* rtl_power: general purpose FFT integrator
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* -f low_freq:high_freq:max_bin_size
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* -i seconds
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* outputs CSV
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* time, low, high, step, db, db, db ...
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* db optional? raw output might be better for noise correction
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* todo:
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* threading
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* randomized hopping
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* noise correction
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* continuous IIR
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* general astronomy usefulness
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* multiple dongles
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* multiple FFT workers
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* fft bins smaller than 61Hz
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* bandwidths smaller than 1MHz
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* check edge cropping for off-by-one and rounding errors
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*/
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#include <errno.h>
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#include <signal.h>
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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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#include <math.h>
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#include <time.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 <fcntl.h>
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#include <io.h>
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#include "getopt/getopt.h"
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#define usleep(x) Sleep(x/1000)
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#define round(x) (x > 0.0 ? floor(x + 0.5): ceil(x - 0.5))
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#endif
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#include <pthread.h>
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#include <libusb.h>
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#include "rtl-sdr.h"
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#define DEFAULT_SAMPLE_RATE 24000
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#define DEFAULT_ASYNC_BUF_NUMBER 32
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#define DEFAULT_BUF_LENGTH (1 * 16384)
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#define MAXIMUM_OVERSAMPLE 16
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#define MAXIMUM_BUF_LENGTH (MAXIMUM_OVERSAMPLE * DEFAULT_BUF_LENGTH)
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#define AUTO_GAIN -100
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#define BUFFER_DUMP (1<<12)
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static volatile int do_exit = 0;
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static rtlsdr_dev_t *dev = NULL;
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FILE *file;
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int16_t* Sinewave;
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double* power_table;
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int N_WAVE, LOG2_N_WAVE;
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int next_power;
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int16_t *fft_buf;
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int *window_coefs;
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struct tuning_state
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/* one per tuning range */
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{
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int freq;
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int rate;
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int bin_e;
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long *avg; /* length == 2^bin_e */
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int samples;
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long mega_samples;
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//pthread_rwlock_t avg_lock;
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//pthread_mutex_t avg_mutex;
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/* having the iq buffer here is wasteful, but will avoid contention */
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uint8_t *buf8;
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int buf_len;
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//pthread_rwlock_t buf_lock;
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//pthread_mutex_t buf_mutex;
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};
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/* 3000 is enough for 3GHz b/w worst case */
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#define MAX_TUNES 3000
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struct tuning_state tunes[MAX_TUNES];
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int tune_count = 0;
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void usage(void)
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{
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fprintf(stderr,
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"rtl_power, a simple FFT logger for RTL2832 based DVB-T receivers\n\n"
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"Use:\trtl_power -f freq_range [-options] [filename]\n"
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"\t-f lower:upper:bin_size [Hz]\n"
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"\t (bin size is a maximum, smaller more convenient bins\n"
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"\t will be used. valid range 61-2M)\n"
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"\t[-i integration_interval (default: 10 seconds)]\n"
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"\t (buggy if a full sweep takes longer than the interval)\n"
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"\t[-1 enables single-shot mode (default: off)]\n"
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"\t[-e exit_timer (default: off/0)]\n"
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//"\t[-s avg/iir smoothing (default: avg)]\n"
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//"\t[-t threads (default: 1)]\n"
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"\t[-d device_index (default: 0)]\n"
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"\t[-g tuner_gain (default: automatic)]\n"
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"\t[-p ppm_error (default: 0)]\n"
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"\tfilename (a '-' dumps samples to stdout)\n"
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"\t (omitting the filename also uses stdout)\n"
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"\n"
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"Experimental options:\n"
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"\t[-w window (default: rectangle)]\n"
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"\t (hamming, blackman, blackman-harris, hann-poisson, bartlett, youssef)\n"
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// kaiser
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"\t[-c crop_percent (default: 0%, recommended: 20%%-50%%)]\n"
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"\t (discards data at the edges, 100%% discards everything)\n"
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"\t (has no effect in rms bin mode)\n"
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"\n"
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"CSV FFT output columns:\n"
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"\tdate, time, Hz low, Hz high, Hz step, samples, dbm, dbm, ...\n\n"
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"Examples:\n"
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"\trtl_power -f 88M:108M:125k fm_stations.csv\n"
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"\t (creates 160 bins across the FM band,\n"
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"\t individual stations should be visible)\n"
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"\trtl_power -f 100M:1G:1M -i 5m -1 survey.csv\n"
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"\t (a five minute low res scan of nearly everything)\n"
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"\trtl_power -f ... -i 15m -1 log.csv\n"
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"\t (integrate for 15 minutes and exit afterwards)\n"
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"\trtl_power -f ... -e 1h | gzip > log.csv.gz\n"
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"\t (collect data for one hour and compress it on the fly)\n"
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"Convert CSV to a waterfall graphic with\n"
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"\thttp://kmkeen.com/tmp/heatmap.py.txt\n"
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"");
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exit(1);
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}
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#ifdef _WIN32
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BOOL WINAPI
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sighandler(int signum)
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{
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if (CTRL_C_EVENT == signum) {
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fprintf(stderr, "Signal caught, exiting!\n");
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do_exit = 1;
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return TRUE;
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}
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return FALSE;
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}
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#else
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static void sighandler(int signum)
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{
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fprintf(stderr, "Signal caught, exiting!\n");
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do_exit = 1;
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}
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#endif
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/* more cond dumbness */
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#define safe_cond_signal(n, m) pthread_mutex_lock(m); pthread_cond_signal(n); pthread_mutex_unlock(m)
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#define safe_cond_wait(n, m) pthread_mutex_lock(m); pthread_cond_wait(n, m); pthread_mutex_unlock(m)
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/* FFT based on fix_fft.c by Roberts, Slaney and Bouras
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http://www.jjj.de/fft/fftpage.html
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16 bit ints for everything
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-32768..+32768 maps to -1.0..+1.0
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*/
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void sine_table(int size)
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{
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int i;
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double d;
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LOG2_N_WAVE = size;
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N_WAVE = 1 << LOG2_N_WAVE;
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Sinewave = malloc(sizeof(int16_t) * N_WAVE*3/4);
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power_table = malloc(sizeof(double) * N_WAVE);
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for (i=0; i<N_WAVE*3/4; i++)
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{
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d = (double)i * 2.0 * M_PI / N_WAVE;
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Sinewave[i] = (int)round(32767*sin(d));
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//printf("%i\n", Sinewave[i]);
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}
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}
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inline int16_t FIX_MPY(int16_t a, int16_t b)
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/* fixed point multiply and scale */
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{
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int c = ((int)a * (int)b) >> 14;
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b = c & 0x01;
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return (c >> 1) + b;
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}
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int fix_fft(int16_t iq[], int16_t m)
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/* interleaved iq[], 0 <= n < 2**m, changes in place */
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{
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int mr, nn, i, j, l, k, istep, n, shift;
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int16_t qr, qi, tr, ti, wr, wi;
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n = 1 << m;
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if (n > N_WAVE)
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{return -1;}
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mr = 0;
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nn = n - 1;
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/* decimation in time - re-order data */
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for (m=1; m<=nn; ++m) {
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l = n;
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do
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{l >>= 1;}
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while (mr+l > nn);
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mr = (mr & (l-1)) + l;
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if (mr <= m)
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{continue;}
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// real = 2*m, imag = 2*m+1
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tr = iq[2*m];
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iq[2*m] = iq[2*mr];
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iq[2*mr] = tr;
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ti = iq[2*m+1];
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iq[2*m+1] = iq[2*mr+1];
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iq[2*mr+1] = ti;
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}
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l = 1;
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k = LOG2_N_WAVE-1;
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while (l < n) {
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shift = 1;
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istep = l << 1;
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for (m=0; m<l; ++m) {
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j = m << k;
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wr = Sinewave[j+N_WAVE/4];
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wi = -Sinewave[j];
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if (shift) {
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wr >>= 1; wi >>= 1;}
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for (i=m; i<n; i+=istep) {
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j = i + l;
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tr = FIX_MPY(wr,iq[2*j]) - FIX_MPY(wi,iq[2*j+1]);
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ti = FIX_MPY(wr,iq[2*j+1]) + FIX_MPY(wi,iq[2*j]);
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qr = iq[2*i];
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qi = iq[2*i+1];
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if (shift) {
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qr >>= 1; qi >>= 1;}
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iq[2*j] = qr - tr;
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iq[2*j+1] = qi - ti;
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iq[2*i] = qr + tr;
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iq[2*i+1] = qi + ti;
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}
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}
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--k;
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l = istep;
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}
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return 0;
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}
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double rectangle(int i, int length)
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{
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return 1.0;
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}
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double hamming(int i, int length)
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{
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double a, b, w, N1;
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a = 25.0/46.0;
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b = 21.0/46.0;
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N1 = (double)(length-1);
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w = a - b*cos(2*i*M_PI/N1);
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return w;
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}
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double blackman(int i, int length)
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{
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double a0, a1, a2, w, N1;
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a0 = 7938.0/18608.0;
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a1 = 9240.0/18608.0;
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a2 = 1430.0/18608.0;
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N1 = (double)(length-1);
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w = a0 - a1*cos(2*i*M_PI/N1) + a2*cos(4*i*M_PI/N1);
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return w;
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}
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double blackman_harris(int i, int length)
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{
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double a0, a1, a2, a3, w, N1;
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a0 = 0.35875;
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a1 = 0.48829;
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a2 = 0.14128;
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a3 = 0.01168;
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N1 = (double)(length-1);
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w = a0 - a1*cos(2*i*M_PI/N1) + a2*cos(4*i*M_PI/N1) - a3*cos(6*i*M_PI/N1);
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return w;
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}
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double hann_poisson(int i, int length)
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{
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double a, N1, w;
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a = 2.0;
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N1 = (double)(length-1);
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w = 0.5 * (1 - cos(2*M_PI*i/N1)) * \
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pow(M_E, (-a*(double)abs((int)(N1-1-2*i)))/N1);
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return w;
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}
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double youssef(int i, int length)
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/* really a blackman-harris-poisson window, but that is a mouthful */
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{
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double a, a0, a1, a2, a3, w, N1;
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a0 = 0.35875;
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a1 = 0.48829;
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a2 = 0.14128;
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a3 = 0.01168;
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N1 = (double)(length-1);
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w = a0 - a1*cos(2*i*M_PI/N1) + a2*cos(4*i*M_PI/N1) - a3*cos(6*i*M_PI/N1);
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a = 0.0025;
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w *= pow(M_E, (-a*(double)abs((int)(N1-1-2*i)))/N1);
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return w;
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}
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double kaiser(int i, int length)
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// todo, become more smart
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{
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return 1.0;
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}
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double bartlett(int i, int length)
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{
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double N1, L, w;
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L = (double)length;
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N1 = L - 1;
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w = (i - N1/2) / (L/2);
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if (w < 0) {
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w = -w;}
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w = 1 - w;
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return w;
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}
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void rms_power(struct tuning_state *ts)
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/* for bins between 1MHz and 2MHz */
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{
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int i, s;
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uint8_t *buf = ts->buf8;
|
||||
int buf_len = ts->buf_len;
|
||||
long p, t;
|
||||
int ln, lp;
|
||||
double dc, err;
|
||||
|
||||
p = t = 0L;
|
||||
for (i=0; i<buf_len; i++) {
|
||||
s = (int)buf[i] - 127;
|
||||
t += (long)s;
|
||||
p += (long)(s * s);
|
||||
}
|
||||
/* correct for dc offset in squares */
|
||||
dc = (double)t / (double)buf_len;
|
||||
err = t * 2 * dc - dc * dc * buf_len;
|
||||
p -= (long)round(err);
|
||||
|
||||
ts->avg[0] += p;
|
||||
ts->samples += 1;
|
||||
/* complex pairs, half length */
|
||||
ts->mega_samples += (long)(buf_len/2);
|
||||
}
|
||||
|
||||
double atofs(char *f)
|
||||
/* standard suffixes */
|
||||
{
|
||||
char last;
|
||||
int len;
|
||||
double suff = 1.0;
|
||||
len = strlen(f);
|
||||
last = f[len-1];
|
||||
f[len-1] = '\0';
|
||||
switch (last) {
|
||||
case 'g':
|
||||
case 'G':
|
||||
suff *= 1e3;
|
||||
case 'm':
|
||||
case 'M':
|
||||
suff *= 1e3;
|
||||
case 'k':
|
||||
case 'K':
|
||||
suff *= 1e3;
|
||||
suff *= atof(f);
|
||||
f[len-1] = last;
|
||||
return suff;
|
||||
}
|
||||
f[len-1] = last;
|
||||
return atof(f);
|
||||
}
|
||||
|
||||
double atoft(char *f)
|
||||
/* time suffixes */
|
||||
{
|
||||
char last;
|
||||
int len;
|
||||
double suff = 1.0;
|
||||
len = strlen(f);
|
||||
last = f[len-1];
|
||||
f[len-1] = '\0';
|
||||
switch (last) {
|
||||
case 'h':
|
||||
case 'H':
|
||||
suff *= 60;
|
||||
case 'm':
|
||||
case 'M':
|
||||
suff *= 60;
|
||||
case 's':
|
||||
case 'S':
|
||||
suff *= atof(f);
|
||||
f[len-1] = last;
|
||||
return suff;
|
||||
}
|
||||
f[len-1] = last;
|
||||
return atof(f);
|
||||
}
|
||||
|
||||
double atofp(char *f)
|
||||
/* percent suffixes */
|
||||
{
|
||||
char last;
|
||||
int len;
|
||||
double suff = 1.0;
|
||||
len = strlen(f);
|
||||
last = f[len-1];
|
||||
f[len-1] = '\0';
|
||||
switch (last) {
|
||||
case '%':
|
||||
suff *= 0.01;
|
||||
suff *= atof(f);
|
||||
f[len-1] = last;
|
||||
return suff;
|
||||
}
|
||||
f[len-1] = last;
|
||||
return atof(f);
|
||||
}
|
||||
|
||||
int nearest_gain(int target_gain)
|
||||
{
|
||||
int i, err1, err2, count, close_gain;
|
||||
int* gains;
|
||||
count = rtlsdr_get_tuner_gains(dev, NULL);
|
||||
if (count <= 0) {
|
||||
return 0;
|
||||
}
|
||||
gains = malloc(sizeof(int) * count);
|
||||
count = rtlsdr_get_tuner_gains(dev, gains);
|
||||
close_gain = gains[0];
|
||||
for (i=0; i<count; i++) {
|
||||
err1 = abs(target_gain - close_gain);
|
||||
err2 = abs(target_gain - gains[i]);
|
||||
if (err2 < err1) {
|
||||
close_gain = gains[i];
|
||||
}
|
||||
}
|
||||
free(gains);
|
||||
return close_gain;
|
||||
}
|
||||
|
||||
void frequency_range(char *arg, double crop)
|
||||
/* flesh out the tunes[] for scanning */
|
||||
// do we want the fewest ranges (easy) or the fewest bins (harder)?
|
||||
{
|
||||
char *start, *stop, *step;
|
||||
int i, j, upper, lower, max_size, bw_seen, bw_used, bin_size, bin_e, buf_len;
|
||||
struct tuning_state *ts;
|
||||
/* hacky string parsing */
|
||||
start = arg;
|
||||
stop = strchr(start, ':') + 1;
|
||||
stop[-1] = '\0';
|
||||
step = strchr(stop, ':') + 1;
|
||||
step[-1] = '\0';
|
||||
lower = (int)atofs(start);
|
||||
upper = (int)atofs(stop);
|
||||
max_size = (int)atofs(step);
|
||||
stop[-1] = ':';
|
||||
step[-1] = ':';
|
||||
/* evenly sized ranges, as close to 2MHz as possible */
|
||||
for (i=1; i<1500; i++) {
|
||||
bw_seen = (upper - lower) / i;
|
||||
bw_used = (int)((double)(bw_seen) / (1.0 - crop));
|
||||
if (bw_used > 2000000) {
|
||||
continue;}
|
||||
tune_count = i;
|
||||
break;
|
||||
}
|
||||
/* number of bins is power-of-two, bin size is under limit */
|
||||
for (i=1; i<=21; i++) {
|
||||
bin_e = i;
|
||||
bin_size = bw_used / (1<<i);
|
||||
if (bin_size <= max_size) {
|
||||
break;}
|
||||
}
|
||||
/* unless giant bins */
|
||||
if (max_size >= 1000000) {
|
||||
bw_seen = max_size;
|
||||
bw_used = max_size;
|
||||
tune_count = (upper - lower) / bw_seen;
|
||||
bin_e = 0;
|
||||
}
|
||||
if (tune_count > MAX_TUNES) {
|
||||
fprintf(stderr, "Error: bandwidth too wide.\n");
|
||||
exit(1);
|
||||
}
|
||||
buf_len = DEFAULT_BUF_LENGTH;
|
||||
if ((2<<bin_e) > buf_len) {
|
||||
buf_len = (2<<bin_e);
|
||||
}
|
||||
/* build the array */
|
||||
for (i=0; i<tune_count; i++) {
|
||||
ts = &tunes[i];
|
||||
ts->freq = lower + i*bw_seen + bw_seen/2;
|
||||
ts->rate = bw_used;
|
||||
ts->bin_e = bin_e;
|
||||
ts->samples = 0;
|
||||
ts->mega_samples = 0L;
|
||||
ts->avg = (long*)malloc((1<<bin_e) * sizeof(long));
|
||||
if (!ts->avg) {
|
||||
fprintf(stderr, "Error: malloc.\n");
|
||||
exit(1);
|
||||
}
|
||||
for (j=0; j<(1<<bin_e); j++) {
|
||||
ts->avg[j] = 0L;
|
||||
}
|
||||
ts->buf8 = (uint8_t*)malloc(buf_len * sizeof(uint8_t));
|
||||
if (!ts->buf8) {
|
||||
fprintf(stderr, "Error: malloc.\n");
|
||||
exit(1);
|
||||
}
|
||||
ts->buf_len = buf_len;
|
||||
}
|
||||
/* report */
|
||||
fprintf(stderr, "Number of frequency hops: %i\n", tune_count);
|
||||
fprintf(stderr, "Dongle bandwidth: %iHz\n", bw_used);
|
||||
fprintf(stderr, "Total FFT bins: %i\n", tune_count * (1<<bin_e));
|
||||
fprintf(stderr, "Logged FFT bins: %i\n", \
|
||||
(int)((double)(tune_count * (1<<bin_e)) * (1.0-crop)));
|
||||
fprintf(stderr, "FFT bin size: %iHz\n", bin_size);
|
||||
fprintf(stderr, "Buffer size: %0.2fms\n", 1000 * 0.5 * (float)buf_len / (float)bw_used);
|
||||
}
|
||||
|
||||
void retune(rtlsdr_dev_t *d, int freq)
|
||||
{
|
||||
uint8_t dump[BUFFER_DUMP];
|
||||
int n_read;
|
||||
rtlsdr_set_center_freq(d, (uint32_t)freq);
|
||||
/* wait for settling and flush buffer */
|
||||
usleep(5000);
|
||||
rtlsdr_read_sync(d, &dump, BUFFER_DUMP, &n_read);
|
||||
if (n_read != BUFFER_DUMP) {
|
||||
fprintf(stderr, "Error: bad retune.\n");}
|
||||
}
|
||||
|
||||
void scanner(void)
|
||||
{
|
||||
int i, j, f, n_read, offset, bin_e, bin_len, buf_len;
|
||||
struct tuning_state *ts;
|
||||
bin_e = tunes[0].bin_e;
|
||||
bin_len = 1 << bin_e;
|
||||
buf_len = tunes[0].buf_len;
|
||||
for (i=0; i<tune_count; i++) {
|
||||
if (do_exit) {
|
||||
break;}
|
||||
ts = &tunes[i];
|
||||
f = (int)rtlsdr_get_center_freq(dev);
|
||||
if (f != ts->freq) {
|
||||
retune(dev, ts->freq);}
|
||||
rtlsdr_read_sync(dev, ts->buf8, buf_len, &n_read);
|
||||
if (n_read != buf_len) {
|
||||
fprintf(stderr, "Error: dropped samples.\n");}
|
||||
/* rms */
|
||||
if (bin_len == 1) {
|
||||
rms_power(ts);
|
||||
continue;
|
||||
}
|
||||
/* fft */
|
||||
for (j=0; j<buf_len; j++) {
|
||||
fft_buf[j] = (int16_t)ts->buf8[j] - 127;
|
||||
}
|
||||
for (offset=0; offset<buf_len; offset+=(2*bin_len)) {
|
||||
// todo, let rect skip this
|
||||
for (j=0; j<bin_len; j++) {
|
||||
fft_buf[offset+j*2] *= window_coefs[j];
|
||||
fft_buf[offset+j*2+1] *= window_coefs[j];
|
||||
}
|
||||
fix_fft(fft_buf+offset, bin_e);
|
||||
for (j=0; j<bin_len; j++) {
|
||||
ts->avg[j] += (long) abs(fft_buf[offset+j*2]);
|
||||
}
|
||||
ts->samples += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void csv_dbm(struct tuning_state *ts, double crop)
|
||||
{
|
||||
int i, len, i1, i2, bw2;
|
||||
long tmp;
|
||||
double dbm;
|
||||
len = 1 << ts->bin_e;
|
||||
/* fix FFT stuff quirks */
|
||||
if (ts->bin_e > 0) {
|
||||
/* nuke DC component (not effective for all windows) */
|
||||
ts->avg[0] = ts->avg[1];
|
||||
/* FFT is translated by 180 degrees */
|
||||
for (i=0; i<len/2; i++) {
|
||||
tmp = ts->avg[i];
|
||||
ts->avg[i] = ts->avg[i+len/2];
|
||||
ts->avg[i+len/2] = tmp;
|
||||
}
|
||||
}
|
||||
/* Hz low, Hz high, Hz step, samples, dbm, dbm, ... */
|
||||
bw2 = (int)((double)ts->rate * (1.0-crop) * 0.5);
|
||||
fprintf(file, "%i, %i, %.2f, %i, ", ts->freq - bw2, ts->freq + bw2,
|
||||
(double)ts->rate / (double)len, ts->samples);
|
||||
// something seems off with the dbm math
|
||||
i1 = 0 + (int)((double)len * crop * 0.5);
|
||||
i2 = (len-1) - (int)((double)len * crop * 0.5);
|
||||
for (i=i1; i<i2; i++) {
|
||||
dbm = (double)ts->avg[i];
|
||||
dbm /= (double)ts->rate;
|
||||
dbm /= (double)ts->samples;
|
||||
dbm = 10 * log10(dbm);
|
||||
fprintf(file, "%.2f, ", dbm);
|
||||
}
|
||||
dbm = (double)ts->avg[i2] / ((double)ts->rate * (double)ts->samples);
|
||||
if (ts->bin_e == 0) {
|
||||
dbm = ((double)ts->avg[0] / \
|
||||
((double)ts->rate * (double)ts->samples));}
|
||||
dbm = 10 * log10(dbm);
|
||||
fprintf(file, "%.2f\n", dbm);
|
||||
for (i=0; i<len; i++) {
|
||||
ts->avg[i] = 0L;
|
||||
}
|
||||
ts->samples = 0;
|
||||
ts->mega_samples = 0L;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
#ifndef _WIN32
|
||||
struct sigaction sigact;
|
||||
#endif
|
||||
char *filename = NULL;
|
||||
int i, length, n_read, r, opt, wb_mode = 0;
|
||||
int gain = AUTO_GAIN; // tenths of a dB
|
||||
uint8_t *buffer;
|
||||
uint32_t dev_index = 0;
|
||||
int device_count;
|
||||
int ppm_error = 0;
|
||||
int interval = 10;
|
||||
int fft_threads = 1;
|
||||
int smoothing = 0;
|
||||
int single = 0;
|
||||
double crop = 0.1;
|
||||
char vendor[256], product[256], serial[256];
|
||||
char *freq_optarg;
|
||||
time_t next_tick;
|
||||
time_t time_now;
|
||||
time_t exit_time = 0;
|
||||
char t_str[50];
|
||||
struct tm *cal_time;
|
||||
double (*window_fn)(int, int) = rectangle;
|
||||
|
||||
while ((opt = getopt(argc, argv, "f:i:s:t:d:g:p:e:w:c:1h")) != -1) {
|
||||
switch (opt) {
|
||||
case 'f': // lower:upper:bin_size
|
||||
freq_optarg = strdup(optarg);
|
||||
break;
|
||||
case 'd':
|
||||
dev_index = atoi(optarg);
|
||||
break;
|
||||
case 'g':
|
||||
gain = (int)(atof(optarg) * 10);
|
||||
break;
|
||||
case 'c':
|
||||
crop = atofp(optarg);
|
||||
break;
|
||||
case 'i':
|
||||
interval = (int)round(atoft(optarg));
|
||||
break;
|
||||
case 'e':
|
||||
exit_time = (time_t)((int)round(atoft(optarg)));
|
||||
break;
|
||||
case 's':
|
||||
if (strcmp("avg", optarg) == 0) {
|
||||
smoothing = 0;}
|
||||
if (strcmp("iir", optarg) == 0) {
|
||||
smoothing = 1;}
|
||||
break;
|
||||
case 'w':
|
||||
if (strcmp("rectangle", optarg) == 0) {
|
||||
window_fn = rectangle;}
|
||||
if (strcmp("hamming", optarg) == 0) {
|
||||
window_fn = hamming;}
|
||||
if (strcmp("blackman", optarg) == 0) {
|
||||
window_fn = blackman;}
|
||||
if (strcmp("blackman-harris", optarg) == 0) {
|
||||
window_fn = blackman_harris;}
|
||||
if (strcmp("hann-poisson", optarg) == 0) {
|
||||
window_fn = hann_poisson;}
|
||||
if (strcmp("youssef", optarg) == 0) {
|
||||
window_fn = youssef;}
|
||||
if (strcmp("kaiser", optarg) == 0) {
|
||||
window_fn = kaiser;}
|
||||
if (strcmp("bartlett", optarg) == 0) {
|
||||
window_fn = bartlett;}
|
||||
break;
|
||||
case 't':
|
||||
fft_threads = atoi(optarg);
|
||||
break;
|
||||
case 'p':
|
||||
ppm_error = atoi(optarg);
|
||||
break;
|
||||
case '1':
|
||||
single = 1;
|
||||
break;
|
||||
case 'h':
|
||||
default:
|
||||
usage();
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
frequency_range(freq_optarg, crop);
|
||||
|
||||
if (tune_count == 0) {
|
||||
usage();}
|
||||
|
||||
if (argc <= optind) {
|
||||
filename = "-";
|
||||
} else {
|
||||
filename = argv[optind];
|
||||
}
|
||||
|
||||
if (interval < 1) {
|
||||
interval = 1;}
|
||||
|
||||
fprintf(stderr, "Reporting every %i seconds\n", interval);
|
||||
|
||||
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 tuner gain */
|
||||
if (gain == AUTO_GAIN) {
|
||||
r = rtlsdr_set_tuner_gain_mode(dev, 0);
|
||||
} else {
|
||||
r = rtlsdr_set_tuner_gain_mode(dev, 1);
|
||||
gain = nearest_gain(gain);
|
||||
r = rtlsdr_set_tuner_gain(dev, gain);
|
||||
}
|
||||
if (r != 0) {
|
||||
fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
|
||||
} else if (gain == AUTO_GAIN) {
|
||||
fprintf(stderr, "Tuner gain set to automatic.\n");
|
||||
} else {
|
||||
fprintf(stderr, "Tuner gain set to %0.2f dB.\n", gain/10.0);
|
||||
}
|
||||
r = rtlsdr_set_freq_correction(dev, ppm_error);
|
||||
|
||||
if (strcmp(filename, "-") == 0) { /* Write log to stdout */
|
||||
file = stdout;
|
||||
#ifdef _WIN32
|
||||
_setmode(_fileno(file), _O_BINARY);
|
||||
#endif
|
||||
} else {
|
||||
file = fopen(filename, "wb");
|
||||
if (!file) {
|
||||
fprintf(stderr, "Failed to open %s\n", filename);
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
/* 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");}
|
||||
|
||||
/* actually do stuff */
|
||||
rtlsdr_set_sample_rate(dev, (uint32_t)tunes[0].rate);
|
||||
sine_table(tunes[0].bin_e);
|
||||
next_tick = time(NULL) + interval;
|
||||
if (exit_time) {
|
||||
exit_time = time(NULL) + exit_time;}
|
||||
fft_buf = malloc(tunes[0].buf_len * sizeof(int16_t));
|
||||
length = 1 << tunes[0].bin_e;
|
||||
window_coefs = malloc(length * sizeof(int));
|
||||
for (i=0; i<length; i++) {
|
||||
window_coefs[i] = (int)(256*window_fn(i, length));
|
||||
}
|
||||
while (!do_exit) {
|
||||
scanner();
|
||||
time_now = time(NULL);
|
||||
if (time_now <= next_tick) {
|
||||
continue;}
|
||||
// time, Hz low, Hz high, Hz step, samples, dbm, dbm, ...
|
||||
cal_time = localtime(&time_now);
|
||||
strftime(t_str, 50, "%Y-%m-%d, %H:%M:%S", cal_time);
|
||||
for (i=0; i<tune_count; i++) {
|
||||
fprintf(file, "%s, ", t_str);
|
||||
csv_dbm(&tunes[i], crop);
|
||||
}
|
||||
fflush(file);
|
||||
while (time(NULL) >= next_tick) {
|
||||
next_tick += interval;}
|
||||
if (single) {
|
||||
do_exit = 1;}
|
||||
if (exit_time && time(NULL) >= exit_time) {
|
||||
do_exit = 1;}
|
||||
}
|
||||
|
||||
/* clean up */
|
||||
|
||||
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(fft_buf);
|
||||
free(window_coefs);
|
||||
//for (i=0; i<tune_count; i++) {
|
||||
// free(tunes[i].avg);
|
||||
// free(tunes[i].buf8);
|
||||
//}
|
||||
return r >= 0 ? r : -r;
|
||||
}
|
||||
|
||||
// vim: tabstop=8:softtabstop=8:shiftwidth=8:noexpandtab
|
||||
Loading…
Reference in New Issue
Block a user