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https://github.com/rtlsdrblog/rtl-sdr-blog.git
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rtl_power: apply first series of patches
* fix typos * droop compensation * improve sample rates, peak hold * direct sampling * offset tuning Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Kyle Keen
Steve Markgraf
parent
1050b96b47
commit
fca2b7d52f
155
src/rtl_power.c
155
src/rtl_power.c
@ -65,10 +65,15 @@
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#include "rtl-sdr.h"
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#define MAX(x, y) (((x) > (y)) ? (x) : (y))
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#define DEFAULT_BUF_LENGTH (1 * 16384)
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#define AUTO_GAIN -100
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#define BUFFER_DUMP (1<<12)
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#define MAXIMUM_RATE 2800000
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#define MINIMUM_RATE 1000000
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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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@ -96,6 +101,7 @@ struct tuning_state
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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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//int *comp_fir;
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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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@ -106,6 +112,8 @@ struct tuning_state tunes[MAX_TUNES];
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int tune_count = 0;
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int boxcar = 1;
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int comp_fir_size = 0;
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int peak_hold = 0;
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void usage(void)
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{
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@ -114,7 +122,7 @@ void usage(void)
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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 1Hz - 2MHz)\n"
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"\t will be used. valid range 1Hz - 2.8MHz)\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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@ -134,8 +142,13 @@ void usage(void)
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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 for bins larger than 1MHz)\n"
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"\t[-F enables low-leakage downsample filter (default: off)]\n"
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"\t (has bad roll off, try with '-c 50%%')\n"
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"\t[-F fir_size (default: disabled)]\n"
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"\t (enables low-leakage downsample filter,\n"
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"\t fir_size can be 0 or 9. 0 has bad roll off,\n"
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"\t try with '-c 50%%')\n"
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"\t[-P enables peak hold (default: off)]\n"
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"\t[-D enable direct sampling (default: off)]\n"
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"\t[-O enable offset tuning (default: off)]\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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@ -189,6 +202,23 @@ static void sighandler(int signum)
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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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/* {length, coef, coef, coef} and scaled by 2^15
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for now, only length 9, optimal way to get +85% bandwidth */
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#define CIC_TABLE_MAX 10
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int cic_9_tables[][10] = {
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{0,},
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{9, -156, -97, 2798, -15489, 61019, -15489, 2798, -97, -156},
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{9, -128, -568, 5593, -24125, 74126, -24125, 5593, -568, -128},
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{9, -129, -639, 6187, -26281, 77511, -26281, 6187, -639, -129},
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{9, -122, -612, 6082, -26353, 77818, -26353, 6082, -612, -122},
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{9, -120, -602, 6015, -26269, 77757, -26269, 6015, -602, -120},
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{9, -120, -582, 5951, -26128, 77542, -26128, 5951, -582, -120},
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{9, -119, -580, 5931, -26094, 77505, -26094, 5931, -580, -119},
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{9, -119, -578, 5921, -26077, 77484, -26077, 5921, -578, -119},
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{9, -119, -577, 5917, -26067, 77473, -26067, 5917, -577, -119},
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{9, -199, -362, 5303, -25505, 77489, -25505, 5303, -362, -199},
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};
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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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@ -379,7 +409,11 @@ void rms_power(struct tuning_state *ts)
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err = t * 2 * dc - dc * dc * buf_len;
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p -= (long)round(err);
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ts->avg[0] += p;
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if (!peak_hold) {
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ts->avg[0] += p;
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} else {
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ts->avg[0] = MAX(ts->avg[0], p);
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}
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ts->samples += 1;
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}
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@ -500,28 +534,29 @@ void frequency_range(char *arg, double crop)
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step[-1] = ':';
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downsample = 1;
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downsample_passes = 0;
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/* evenly sized ranges, as close to 2MHz as possible */
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/* evenly sized ranges, as close to MAXIMUM_RATE as possible */
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// todo, replace loop with algebra
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for (i=1; i<1500; i++) {
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bw_seen = (upper - lower) / i;
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bw_used = (int)((double)(bw_seen) / (1.0 - crop));
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if (bw_used > 2000000) {
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if (bw_used > MAXIMUM_RATE) {
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continue;}
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tune_count = i;
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break;
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}
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/* unless small bandwidth */
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if (bw_used < 1000000) {
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tune_count = 1;}
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if (boxcar && bw_used < 1000000) {
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downsample = 2000000 / bw_used;
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if (bw_used < MINIMUM_RATE) {
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tune_count = 1;
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downsample = MAXIMUM_RATE / bw_used;
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bw_used = bw_used * downsample;
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}
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while (bw_used < 1000000) { /* not boxcar */
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downsample_passes++;
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if (!boxcar && downsample > 1) {
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downsample_passes = (int)log2(downsample);
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downsample = 1 << downsample_passes;
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bw_used = (int)((double)(bw_seen * downsample) / (1.0 - crop));
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}
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/* number of bins is power-of-two, bin size is under limit */
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// todo, replace loop with log2
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for (i=1; i<=21; i++) {
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bin_e = i;
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bin_size = (double)bw_used / (double)((1<<i) * downsample);
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@ -529,7 +564,7 @@ void frequency_range(char *arg, double crop)
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break;}
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}
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/* unless giant bins */
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if (max_size >= 1000000) {
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if (max_size >= MINIMUM_RATE) {
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bw_seen = max_size;
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bw_used = max_size;
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tune_count = (upper - lower) / bw_seen;
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@ -624,7 +659,7 @@ void remove_dc(int16_t *data, int length)
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/* works on interleaved data */
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{
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int i;
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int16_t ave;
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int16_t ave;
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long sum = 0L;
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for (i=0; i < length; i+=2) {
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sum += data[i];
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@ -637,6 +672,36 @@ void remove_dc(int16_t *data, int length)
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}
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}
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void generic_fir(int16_t *data, int length, int *fir)
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/* Okay, not at all generic. Assumes length 9, fix that eventually. */
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{
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int d, f, temp, sum;
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int hist[9] = {0,};
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/* cheat on the beginning, let it go unfiltered */
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for (d=0; d<18; d+=2) {
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hist[d/2] = data[d];
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}
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for (d=18; d<length; d+=2) {
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temp = data[d];
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sum = 0;
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sum += (hist[0] + hist[8]) * fir[1];
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sum += (hist[1] + hist[7]) * fir[2];
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sum += (hist[2] + hist[6]) * fir[3];
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sum += (hist[3] + hist[5]) * fir[4];
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sum += hist[4] * fir[5];
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data[d] = (int16_t)(sum >> 15) ;
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hist[0] = hist[1];
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hist[1] = hist[2];
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hist[2] = hist[3];
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hist[3] = hist[4];
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hist[4] = hist[5];
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hist[5] = hist[6];
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hist[6] = hist[7];
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hist[7] = hist[8];
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hist[8] = temp;
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}
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}
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void downsample_iq(int16_t *data, int length)
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{
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fifth_order(data, length);
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@ -647,7 +712,7 @@ void downsample_iq(int16_t *data, int length)
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void scanner(void)
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{
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int i, j, j2, f, n_read, offset, bin_e, bin_len, buf_len, ds;
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int i, j, j2, f, n_read, offset, bin_e, bin_len, buf_len, ds, ds_p;
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int32_t w;
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struct tuning_state *ts;
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bin_e = tunes[0].bin_e;
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@ -673,22 +738,30 @@ void scanner(void)
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fft_buf[j] = (int16_t)ts->buf8[j] - 127;
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}
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ds = ts->downsample;
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if (boxcar) {
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ds_p = ts->downsample_passes;
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if (boxcar && ds > 1) {
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j=2, j2=0;
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while (j < buf_len) {
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fft_buf[j2] += fft_buf[j];
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fft_buf[j2+1] += fft_buf[j+1];
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fft_buf[j] = 0;
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fft_buf[j+1] = 0;
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j += 2;
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if (j % (ds*2) == 0) {
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j2 += 2;}
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}
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} else { /* recursive */
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for (j=0; j < ts->downsample_passes; j++) {
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} else if (ds_p) { /* recursive */
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for (j=0; j < ds_p; j++) {
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downsample_iq(fft_buf, buf_len >> j);
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}
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/* droop compensation */
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if (comp_fir_size == 9 && ds_p <= CIC_TABLE_MAX) {
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generic_fir(fft_buf, buf_len >> j, cic_9_tables[ds_p]);
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generic_fir(fft_buf+1, (buf_len >> j)-1, cic_9_tables[ds_p]);
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}
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}
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remove_dc(fft_buf, buf_len >> j);
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remove_dc(fft_buf+1, (buf_len >> j) - 1);
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remove_dc(fft_buf, buf_len / ds);
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remove_dc(fft_buf+1, (buf_len / ds) - 1);
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/* window function and fft */
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for (offset=0; offset<(buf_len/ds); offset+=(2*bin_len)) {
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// todo, let rect skip this
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@ -703,8 +776,14 @@ void scanner(void)
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fft_buf[offset+j*2+1] = (int16_t)w;
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}
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fix_fft(fft_buf+offset, bin_e);
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for (j=0; j<bin_len; j++) {
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ts->avg[j] += (long) abs(fft_buf[offset+j*2]);
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if (!peak_hold) {
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for (j=0; j<bin_len; j++) {
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ts->avg[j] += (long) abs(fft_buf[offset+j*2]);
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}
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} else {
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for (j=0; j<bin_len; j++) {
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ts->avg[j] = MAX((long) abs(fft_buf[offset+j*2]), ts->avg[j]);
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}
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}
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ts->samples += ds;
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}
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@ -773,6 +852,8 @@ int main(int argc, char **argv)
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int fft_threads = 1;
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int smoothing = 0;
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int single = 0;
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int direct_sampling = 0;
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int offset_tuning = 0;
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double crop = 0.0;
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char vendor[256], product[256], serial[256];
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char *freq_optarg;
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@ -784,7 +865,7 @@ int main(int argc, char **argv)
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double (*window_fn)(int, int) = rectangle;
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freq_optarg = "";
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while ((opt = getopt(argc, argv, "f:i:s:t:d:g:p:e:w:c:1Fh")) != -1) {
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while ((opt = getopt(argc, argv, "f:i:s:t:d:g:p:e:w:c:F:1PDOh")) != -1) {
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switch (opt) {
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case 'f': // lower:upper:bin_size
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freq_optarg = strdup(optarg);
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@ -838,8 +919,18 @@ int main(int argc, char **argv)
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case '1':
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single = 1;
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break;
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case 'P':
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peak_hold = 1;
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break;
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case 'D':
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direct_sampling = 1;
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break;
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case 'O':
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offset_tuning = 1;
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break;
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case 'F':
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boxcar = 0;
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comp_fir_size = atoi(optarg);
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break;
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case 'h':
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default:
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@ -907,6 +998,24 @@ int main(int argc, char **argv)
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SetConsoleCtrlHandler( (PHANDLER_ROUTINE) sighandler, TRUE );
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#endif
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if (direct_sampling) {
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r = rtlsdr_set_direct_sampling(dev, 1);
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if (r != 0) {
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fprintf(stderr, "WARNING: Failed to set direct sampling mode.\n");
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} else {
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fprintf(stderr, "Direct sampling mode enabled.\n");
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}
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}
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if (offset_tuning) {
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r = rtlsdr_set_offset_tuning(dev, 1);
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if (r != 0) {
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fprintf(stderr, "WARNING: Failed to set offset tuning.\n");
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} else {
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fprintf(stderr, "Offset tuning mode enabled.\n");
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}
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}
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/* Set the tuner gain */
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if (gain == AUTO_GAIN) {
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r = rtlsdr_set_tuner_gain_mode(dev, 0);
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