mirror of
https://github.com/rtlsdrblog/rtl-sdr-blog.git
synced 2024-11-10 04:37:37 +01:00
rtl_test: refactoring and optimization for PPM error
Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Michael Tatarinov
Steve Markgraf
parent
2c171630fa
commit
1cc9d64d98
186
src/rtl_test.c
186
src/rtl_test.c
@ -48,28 +48,23 @@
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#define MHZ(x) ((x)*1000*1000)
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#define PPM_DURATION 10
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#define PPM_DUMP_TIME 5
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static enum {
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NO_BENCHMARK,
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TUNER_BENCHMARK,
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PPM_BENCHMARK
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} test_mode = NO_BENCHMARK;
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static int do_exit = 0;
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static rtlsdr_dev_t *dev = NULL;
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static int ppm_benchmark = 0;
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static int ppm_running = 0;
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static int64_t ppm_count = 0L;
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static int64_t ppm_total = 0L;
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uint32_t samp_rate = DEFAULT_SAMPLE_RATE;
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static uint32_t samp_rate = DEFAULT_SAMPLE_RATE;
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long total_samples;
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long dropped_samples;
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static uint32_t total_samples = 0;
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static uint32_t dropped_samples = 0;
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#ifndef _WIN32
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static struct timespec ppm_start;
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static struct timespec ppm_recent;
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static struct timespec ppm_now;
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#endif
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#ifdef __APPLE__
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static struct timeval tv;
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#endif
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static unsigned int ppm_duration = PPM_DURATION;
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void usage(void)
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{
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@ -79,9 +74,9 @@ void usage(void)
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"\t[-s samplerate (default: 2048000 Hz)]\n"
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"\t[-d device_index (default: 0)]\n"
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"\t[-t enable Elonics E4000 tuner benchmark]\n"
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#ifndef _WIN32
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"\t[-p enable PPM error measurement]\n"
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#endif
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#ifndef _WIN32
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"\t[-p[seconds] enable PPM error measurement (default: 10 seconds)]\n"
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#endif
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"\t[-b output_block_size (default: 16 * 16384)]\n"
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"\t[-S force sync output (default: async)]\n");
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exit(1);
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@ -126,8 +121,8 @@ static void underrun_test(unsigned char *buf, uint32_t len, int mute)
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bcnt++;
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}
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total_samples += (long)len;
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dropped_samples += (long)lost;
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total_samples += len;
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dropped_samples += lost;
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if (mute)
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return;
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if (lost)
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@ -135,77 +130,92 @@ static void underrun_test(unsigned char *buf, uint32_t len, int mute)
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}
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static void ppm_clock_init(void)
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#ifndef _WIN32
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static int ppm_gettime(struct timespec *ts)
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{
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#ifdef __APPLE__
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gettimeofday(&tv, NULL);
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ppm_recent.tv_sec = tv.tv_sec;
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ppm_recent.tv_nsec = tv.tv_usec*1000;
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ppm_start.tv_sec = tv.tv_sec;
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ppm_start.tv_nsec = tv.tv_usec*1000;
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#elif __unix__
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clock_gettime(CLOCK_REALTIME, &ppm_recent);
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clock_gettime(CLOCK_REALTIME, &ppm_start);
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int rv = ENOSYS;
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#ifdef __unix__
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rv = clock_gettime(CLOCK_MONOTONIC, ts);
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#elif __APPLE__
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struct timeval tv;
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rv = gettimeofday(&tv, NULL);
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ts->tv_sec = tv.tv_sec;
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ts->tv_nsec = tv.tv_usec * 1000;
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#endif
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return rv;
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}
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#ifndef _WIN32
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static int ppm_report(void)
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static int ppm_report(uint64_t nsamples, uint64_t interval)
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{
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int real_rate;
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int64_t ns;
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ns = 1000000000L * (int64_t)(ppm_recent.tv_sec - ppm_start.tv_sec);
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ns += (int64_t)(ppm_recent.tv_nsec - ppm_start.tv_nsec);
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real_rate = (int)(ppm_total * 1000000000L / ns);
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return (int)round((double)(1000000 * (real_rate - (int)samp_rate)) / (double)samp_rate);
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double real_rate, ppm;
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real_rate = nsamples * 1e9 / interval;
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ppm = 1e6 * (real_rate / (double)samp_rate - 1.);
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return (int)round(ppm);
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}
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#endif
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static void ppm_test(uint32_t len)
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{
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int64_t ns;
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static uint64_t nsamples = 0;
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static uint64_t interval = 0;
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static uint64_t nsamples_total = 0;
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static uint64_t interval_total = 0;
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struct timespec ppm_now;
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static struct timespec ppm_recent;
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static enum {
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PPM_INIT_NO,
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PPM_INIT_DUMP,
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PPM_INIT_RUN
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} ppm_init = PPM_INIT_NO;
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ppm_count += (int64_t)len;
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#ifndef _WIN32
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#ifndef __APPLE__
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clock_gettime(CLOCK_REALTIME, &ppm_now);
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#else
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gettimeofday(&tv, NULL);
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ppm_now.tv_sec = tv.tv_sec;
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ppm_now.tv_nsec = tv.tv_usec*1000;
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#endif
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if (ppm_now.tv_sec - ppm_recent.tv_sec > PPM_DURATION) {
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ns = 1000000000L * (int64_t)(ppm_now.tv_sec - ppm_recent.tv_sec);
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ns += (int64_t)(ppm_now.tv_nsec - ppm_recent.tv_nsec);
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printf("real sample rate: %i",
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(int)((1000000000L * ppm_count / 2L) / ns));
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#ifndef __APPLE__
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clock_gettime(CLOCK_REALTIME, &ppm_recent);
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#else
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gettimeofday(&tv, NULL);
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ppm_recent.tv_sec = tv.tv_sec;
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ppm_recent.tv_nsec = tv.tv_usec*1000;
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#endif
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ppm_total += ppm_count / 2L;
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ppm_count = 0L;
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printf(" cumulative ppm: %i\n", ppm_report());
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ppm_gettime(&ppm_now);
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if (ppm_init != PPM_INIT_RUN) {
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/*
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* Kyle Keen wrote:
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* PPM_DUMP_TIME throws out the first N seconds of data.
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* The dongle's PPM is usually very bad when first starting up,
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* typically incorrect by more than twice the final value.
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* Discarding the first few seconds allows the value to stabilize much faster.
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*/
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if (ppm_init == PPM_INIT_NO) {
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ppm_recent.tv_sec = ppm_now.tv_sec + PPM_DUMP_TIME;
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ppm_init = PPM_INIT_DUMP;
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return;
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}
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#endif
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if (ppm_init == PPM_INIT_DUMP && ppm_recent.tv_sec < ppm_now.tv_sec)
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return;
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ppm_recent.tv_sec = ppm_now.tv_sec;
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ppm_recent.tv_nsec = ppm_now.tv_nsec;
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ppm_init = PPM_INIT_RUN;
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return;
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}
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nsamples += (uint64_t)(len / 2UL);
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interval = (uint64_t)(ppm_now.tv_sec - ppm_recent.tv_sec);
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if (interval < ppm_duration)
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return;
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interval *= 1000000000UL;
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interval += (int64_t)(ppm_now.tv_nsec - ppm_recent.tv_nsec);
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nsamples_total += nsamples;
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interval_total += interval;
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printf("real sample rate: %i current PPM: %i cumulative PPM: %i\n",
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(int)((1000000000UL * nsamples) / interval),
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ppm_report(nsamples, interval),
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ppm_report(nsamples_total, interval_total));
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ppm_recent.tv_sec = ppm_now.tv_sec;
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ppm_recent.tv_nsec = ppm_now.tv_nsec;
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nsamples = 0;
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}
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#endif
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static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
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{
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underrun_test(buf, len, 0);
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if (ppm_benchmark && !ppm_running) {
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ppm_clock_init();
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ppm_running = 1;
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return;
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}
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if (ppm_benchmark) {
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#ifndef _WIN32
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if (test_mode == PPM_BENCHMARK)
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ppm_test(len);
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}
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#endif
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}
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void e4k_benchmark(void)
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@ -259,9 +269,7 @@ int main(int argc, char **argv)
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#ifndef _WIN32
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struct sigaction sigact;
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#endif
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int n_read;
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int r, opt;
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int i, tuner_benchmark = 0;
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int n_read, r, opt, i;
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int sync_mode = 0;
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uint8_t *buffer;
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int dev_index = 0;
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@ -270,7 +278,7 @@ int main(int argc, char **argv)
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int count;
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int gains[100];
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while ((opt = getopt(argc, argv, "d:s:b:tpS::")) != -1) {
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while ((opt = getopt(argc, argv, "d:s:b:tp::Sh")) != -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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@ -283,14 +291,17 @@ int main(int argc, char **argv)
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out_block_size = (uint32_t)atof(optarg);
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break;
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case 't':
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tuner_benchmark = 1;
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test_mode = TUNER_BENCHMARK;
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break;
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case 'p':
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ppm_benchmark = PPM_DURATION;
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test_mode = PPM_BENCHMARK;
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if (optarg)
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ppm_duration = atoi(optarg);
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break;
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case 'S':
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sync_mode = 1;
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break;
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case 'h':
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default:
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usage();
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break;
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@ -345,7 +356,7 @@ int main(int argc, char **argv)
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/* Set the sample rate */
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verbose_set_sample_rate(dev, samp_rate);
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if (tuner_benchmark) {
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if (test_mode == TUNER_BENCHMARK) {
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if (rtlsdr_get_tuner_type(dev) == RTLSDR_TUNER_E4000)
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e4k_benchmark();
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else
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@ -360,12 +371,12 @@ int main(int argc, char **argv)
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/* Reset endpoint before we start reading from it (mandatory) */
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verbose_reset_buffer(dev);
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if (ppm_benchmark && !sync_mode) {
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fprintf(stderr, "Reporting PPM error measurement every %i seconds...\n", ppm_benchmark);
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if ((test_mode == PPM_BENCHMARK) && !sync_mode) {
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fprintf(stderr, "Reporting PPM error measurement every %i seconds...\n", ppm_duration);
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fprintf(stderr, "Press ^C after a few minutes.\n");
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}
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if (!ppm_benchmark) {
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if (test_mode == NO_BENCHMARK) {
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fprintf(stderr, "\nInfo: This tool will continuously"
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" read from the device, and report if\n"
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"samples get lost. If you observe no "
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@ -397,11 +408,6 @@ int main(int argc, char **argv)
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if (do_exit) {
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fprintf(stderr, "\nUser cancel, exiting...\n");
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fprintf(stderr, "Samples per million lost (minimum): %i\n", (int)(1000000L * dropped_samples / total_samples));
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#ifndef _WIN32
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if (ppm_benchmark) {
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printf("Cumulative PPM error: %i\n", ppm_report());
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}
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#endif
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}
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else
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fprintf(stderr, "\nLibrary error %d, exiting...\n", r);
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