/* Receive samples from the USRP or read from file */
int iodev_receive(iodev_t *q, cf_t **buffer) {
int n;
if (q->mode == FILESOURCE) {
INFO(" ----- READING %d SAMPLES ---- \n", q->sf_len);
n = filesource_read(&q->fsrc, q->input_buffer_file, q->sf_len);
*buffer = q->input_buffer_file;
if (n == -1) {
fprintf(stderr, "Error reading file\n");
/* wrap file if arrive to end */
} else if (n < q->sf_len) {
DEBUG("Read %d from file. Seeking to 0\n",n);
filesource_seek(&q->fsrc, 0);
n = filesource_read(&q->fsrc, q->input_buffer_file, q->sf_len);
if (n == -1) {
fprintf(stderr, "Error reading file\n");
/* wrap file if arrive to end */
} else {
n = 1;
}
} else {
n = 1;
}
q->sf_idx++;
if (q->sf_idx == 10) {
q->sf_idx = 0;
}
usleep(5000);
} else {
/* Use ue_sync_work which returns a synchronized buffer of subframe samples */
#ifndef DISABLE_UHD
n = ue_sync_get_buffer(&q->sframe, buffer);
if (n < 0) {
fprintf(stderr, "Error calling ue_sync_work()\n");
}
#endif
}
return n;
}
int main(int argc, char **argv) {
cf_t *input_buffer, *sf_symbols = NULL;
int frame_cnt;
ue_sync_t s;
int pos;
pss_synch_t pss;
float peak;
struct timeval t[3];
float mean_ce_time=0;
bool signal_detected;
lte_fft_t fft;
lte_cell_t cell;
bzero(&cell, sizeof(lte_cell_t));
parse_args(argc, argv);
#ifndef DISABLE_GRAPHICS
if (!disable_plots) {
init_plots();
}
#endif
input_init();
if (ue_sync_init(&s, cuhd_set_rx_srate, cuhd_recv_wrapper, uhd)) {
fprintf(stderr, "Error initiating UE sync module\n");
exit(-1);
}
ue_sync_pbch_enable(&s, true);
signal_detected = true;
frame_cnt = 0;
mean_ce_time=0;
uint32_t valid_frames=0;
//uint32_t unaligned = 0;
while (frame_cnt < nof_frames || nof_frames == -1) {
int n = ue_sync_get_buffer(&s, &input_buffer);
if (n < 0) {
fprintf(stderr, "Error calling sync work()\n");
exit(-1);
}
if (n == 1 && ue_sync_get_sfidx(&s) == 0) {
if (signal_detected) {
cell = ue_sync_get_cell(&s);
pss_synch_init_fft(&pss,
SF_LEN(lte_symbol_sz(cell.nof_prb), cell.cp),
lte_symbol_sz(cell.nof_prb));
pss_synch_set_N_id_2(&pss, cell.id%3);
sf_symbols = vec_malloc(SLOT_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
if (!sf_symbols) {
perror("malloc");
exit(-1);
}
lte_fft_init(&fft, cell.cp, cell.nof_prb);
signal_detected = false;
}
mean_ce_time = (float) (mean_ce_time + (float) t[0].tv_usec * valid_frames) / (valid_frames+1);
valid_frames++;
#ifndef DISABLE_GRAPHICS
if (!disable_plots && !(valid_frames % 5) && sf_symbols) {
/* Run FFT for the second slot */
lte_fft_run_slot(&fft, input_buffer, sf_symbols);
int i;
int nof_re = SLOT_LEN_RE(cell.nof_prb, cell.cp);
for (i = 0; i < nof_re; i++) {
tmp_plot[i] = 10 * log10f(cabsf(sf_symbols[i]));
if (isinf(tmp_plot[i])) {
tmp_plot[i] = -80;
}
}
plot_real_setNewData(&poutfft, tmp_plot, nof_re);
}
#endif
pos = pss_synch_find_pss(&pss, input_buffer, &peak, NULL);
/*if (pos > 962 || pos < 958) {
unaligned++;
}
*/
printf("CELL_ID: %3d CFO: %+.4f KHz, SFO: %+.4f Khz, TimeOffset: %4d, Exec: %3.2f\r",
cell.id, ue_sync_get_cfo(&s)/1000, ue_sync_get_sfo(&s)/1000, pos,
s.mean_exec_time);
fflush(stdout);
if (VERBOSE_ISINFO()) {
printf("\n");
}
}
frame_cnt++;
}
printf("\nBye\n");
exit(0);
}
