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hackrf_sweep: suppress ifft output unless requested

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This commit is contained in:
Michael Ossmann
2017-02-21 12:18:41 -07:00
parent 886ba6acfb
commit 9baac39962
1 changed files with 17 additions and 13 deletions
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30
host/hackrf-tools/src/hackrf_sweep.c
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@ -231,12 +231,14 @@ int rx_callback(hackrf_transfer* transfer) {
} }
if (frequency == (uint64_t)(FREQ_ONE_MHZ*frequencies[0])) { if (frequency == (uint64_t)(FREQ_ONE_MHZ*frequencies[0])) {
if(sweep_started) { if(sweep_started) {
fftwf_execute(ifftwPlan); if(ifft_output) {
for(i=0; i < ifft_bins; i++) { fftwf_execute(ifftwPlan);
ifftwOut[i][0] *= 1.0f / ifft_bins; for(i=0; i < ifft_bins; i++) {
ifftwOut[i][1] *= 1.0f / ifft_bins; ifftwOut[i][0] *= 1.0f / ifft_bins;
fwrite(&ifftwOut[i][0], sizeof(float), 1, fd); ifftwOut[i][1] *= 1.0f / ifft_bins;
fwrite(&ifftwOut[i][1], sizeof(float), 1, fd); fwrite(&ifftwOut[i][0], sizeof(float), 1, fd);
fwrite(&ifftwOut[i][1], sizeof(float), 1, fd);
}
} }
if(one_shot) { if(one_shot) {
do_exit = true; do_exit = true;
@ -274,9 +276,6 @@ int rx_callback(hackrf_transfer* transfer) {
for (i=0; i < fftSize; i++) { for (i=0; i < fftSize; i++) {
pwr[i] = logPower(fftwOut[i], 1.0f / fftSize); pwr[i] = logPower(fftwOut[i], 1.0f / fftSize);
} }
ifft_idx = round((frequency - (uint64_t)(FREQ_ONE_MHZ*frequencies[0]))
/ fft_bin_width);
ifft_idx = (ifft_idx + ifft_bins/2) % ifft_bins;
if(binary_output) { if(binary_output) {
record_length = 2 * sizeof(band_edge) record_length = 2 * sizeof(band_edge)
+ (fftSize/4) * sizeof(float); + (fftSize/4) * sizeof(float);
@ -295,6 +294,9 @@ int rx_callback(hackrf_transfer* transfer) {
fwrite(&band_edge, sizeof(band_edge), 1, fd); fwrite(&band_edge, sizeof(band_edge), 1, fd);
fwrite(&pwr[1+fftSize/8], sizeof(float), fftSize/4, fd); fwrite(&pwr[1+fftSize/8], sizeof(float), fftSize/4, fd);
} else if(ifft_output) { } else if(ifft_output) {
ifft_idx = round((frequency - (uint64_t)(FREQ_ONE_MHZ*frequencies[0]))
/ fft_bin_width);
ifft_idx = (ifft_idx + ifft_bins/2) % ifft_bins;
for(i = 0; (fftSize / 4) > i; i++) { for(i = 0; (fftSize / 4) > i; i++) {
ifftwIn[ifft_idx + i][0] = fftwOut[i + 1 + (fftSize*5)/8][0]; ifftwIn[ifft_idx + i][0] = fftwOut[i + 1 + (fftSize*5)/8][0];
ifftwIn[ifft_idx + i][1] = fftwOut[i + 1 + (fftSize*5)/8][1]; ifftwIn[ifft_idx + i][1] = fftwOut[i + 1 + (fftSize*5)/8][1];
@ -349,7 +351,7 @@ static void usage() {
fprintf(stderr, "\t[-1] # one shot mode\n"); fprintf(stderr, "\t[-1] # one shot mode\n");
fprintf(stderr, "\t[-B] # binary output\n"); fprintf(stderr, "\t[-B] # binary output\n");
fprintf(stderr, "\t[-I] # binary inverse FFT output\n"); fprintf(stderr, "\t[-I] # binary inverse FFT output\n");
fprintf(stderr, "\t-r filename # output file"); fprintf(stderr, "\t-r filename # output file\n");
fprintf(stderr, "\n"); fprintf(stderr, "\n");
fprintf(stderr, "Output fields:\n"); fprintf(stderr, "Output fields:\n");
fprintf(stderr, "\tdate, time, hz_low, hz_high, hz_bin_width, num_samples, dB, dB, . . .\n"); fprintf(stderr, "\tdate, time, hz_low, hz_high, hz_bin_width, num_samples, dB, dB, . . .\n");
@ -639,9 +641,11 @@ int main(int argc, char** argv) {
frequencies[2*i], frequencies[2*i+1]); frequencies[2*i], frequencies[2*i+1]);
} }
ifftwIn = (fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex) * fftSize * step_count); if(ifft_output) {
ifftwOut = (fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex) * fftSize * step_count); ifftwIn = (fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex) * fftSize * step_count);
ifftwPlan = fftwf_plan_dft_1d(fftSize * step_count, ifftwIn, ifftwOut, FFTW_BACKWARD, FFTW_MEASURE); ifftwOut = (fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex) * fftSize * step_count);
ifftwPlan = fftwf_plan_dft_1d(fftSize * step_count, ifftwIn, ifftwOut, FFTW_BACKWARD, FFTW_MEASURE);
}
result |= hackrf_start_rx(device, rx_callback, NULL); result |= hackrf_start_rx(device, rx_callback, NULL);
if (result != HACKRF_SUCCESS) { if (result != HACKRF_SUCCESS) {