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Merge pull request #1157 from martinling/standardise-dbfs

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Standardise dBFS level
This commit is contained in:
Michael Ossmann
2022-09-15 04:59:45 -04:00
committed by GitHub
parent 75e3137d55 f1e34b7cea
commit 2b1aa545f8
1 changed files with 9 additions and 7 deletions
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16
host/hackrf-tools/src/hackrf_transfer.c
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@ -506,8 +506,10 @@ int tx_callback(hackrf_transfer* transfer)
bytes_to_xfer -= bytes_to_read;
}
for (i = 0; i < bytes_to_read; i++)
transfer->buffer[i] = -(uint8_t) amplitude;
for (i = 0; i < bytes_to_read; i += 2) {
transfer->buffer[i] = amplitude;
transfer->buffer[i + 1] = 0;
}
if (limit_num_samples && (bytes_to_xfer == 0)) {
stop_main_loop();
@ -629,7 +631,7 @@ static void usage()
printf("\t[-S buf_size] # Enable receive streaming with buffer size buf_size.\n");
#endif
printf("\t[-B] # Print buffer statistics during transfer\n");
printf("\t[-c amplitude] # CW signal source mode, amplitude 0-128 (DC value to DAC).\n");
printf("\t[-c amplitude] # CW signal source mode, amplitude 0-127 (DC value to DAC).\n");
printf("\t[-R] # Repeat TX mode (default is off) \n");
printf("\t[-b baseband_filter_bw_hz] # Set baseband filter bandwidth in Hz.\n");
printf("\tPossible values: 1.75/2.5/3.5/5/5.5/6/7/8/9/10/12/14/15/20/24/28MHz, default <= 0.75 * sample_rate_hz.\n");
@ -1019,9 +1021,9 @@ int main(int argc, char** argv)
if (signalsource) {
transceiver_mode = TRANSCEIVER_MODE_SS;
if (amplitude > 128) {
if (amplitude > 127) {
fprintf(stderr,
"argument error: amplitude must be between 0 and 128.\n");
"argument error: amplitude must be between 0 and 127.\n");
usage();
return EXIT_FAILURE;
}
@ -1355,8 +1357,8 @@ int main(int argc, char** argv)
fprintf(stderr, "Waiting for sync...\n");
} else {
double full_scale_ratio = (double) stream_power_now /
(byte_count_now * 128 * 128);
double dB_full_scale = 10 * log10(full_scale_ratio);
(byte_count_now * 127 * 127);
double dB_full_scale = 10 * log10(full_scale_ratio) + 3.0;
fprintf(stderr,
"%4.1f MiB / %5.3f sec = %4.1f MiB/second, average power %3.1f dBfs",
(byte_count_now / 1e6f),