C++ (Cpp) cuhd_recv_with_time Examples

Example #1

File: cuhd_imp.cpp Project: sdnnfv/srsLTE

int cuhd_recv(void *h, void *data, uint32_t nsamples, bool blocking)
{
  return cuhd_recv_with_time(h, data, nsamples, blocking, NULL, NULL);
}

Example #2

File: prach_test_usrp.c Project: xuancaishaun/srsLTE

int main(int argc, char **argv) {
  parse_args(argc, argv);

  srslte_prach_t *p = (srslte_prach_t*)malloc(sizeof(srslte_prach_t));

  bool high_speed_flag      = false;

  cf_t preamble[MAX_LEN];
  memset(preamble, 0, sizeof(cf_t)*MAX_LEN);

  srslte_prach_init(p,
             srslte_symbol_sz(nof_prb),
             preamble_format,
             root_seq_idx,
             high_speed_flag,
             zero_corr_zone);

  uint32_t flen = srslte_sampling_freq_hz(nof_prb)/1000;

  printf("Generating PRACH\n");
  bzero(preamble, flen*sizeof(cf_t));
  srslte_prach_gen(p,
            seq_idx,
            frequency_offset,
            preamble);
  
  
  uint32_t prach_len = p->N_seq;
  
  srslte_vec_save_file("generated",preamble,prach_len*sizeof(cf_t));
  
  cf_t *buffer = malloc(sizeof(cf_t)*flen*nof_frames);
  
  // Send through UHD 
  void *uhd; 
  printf("Opening UHD device...\n");
  if (cuhd_open(uhd_args, &uhd)) {
    fprintf(stderr, "Error opening uhd\n");
    exit(-1);
  }
  printf("Subframe len:   %d samples\n", flen);
  printf("Set TX/RX rate: %.2f MHz\n", cuhd_set_rx_srate(uhd, srslte_sampling_freq_hz(nof_prb)) / 1000000);
  printf("Set RX gain: %.1f dB\n", cuhd_set_rx_gain(uhd, uhd_gain));
  printf("Set TX gain: %.1f dB\n", cuhd_set_tx_gain(uhd, uhd_gain));
  printf("Set TX/RX freq: %.2f MHz\n", cuhd_set_rx_freq(uhd, uhd_freq) / 1000000);
  cuhd_set_tx_srate(uhd, srslte_sampling_freq_hz(nof_prb));
  cuhd_set_tx_freq_offset(uhd, uhd_freq, 8e6);  
  sleep(1);
  
  cf_t *zeros = calloc(sizeof(cf_t),flen);
  
  FILE *f = NULL; 
  if (output_filename) {        
    f = fopen(output_filename, "w");
  }
  
  srslte_timestamp_t tstamp; 
  
  cuhd_start_rx_stream(uhd);
  uint32_t nframe=0;
  
  while(nframe<nof_frames) {
    printf("Rx subframe %d\n", nframe);
    cuhd_recv_with_time(uhd, &buffer[flen*nframe], flen, true, &tstamp.full_secs, &tstamp.frac_secs);
    nframe++;
    if (nframe==9 || nframe==8) {
      srslte_timestamp_add(&tstamp, 0, 2e-3);
      if (nframe==8) {
        cuhd_send_timed2(uhd, zeros, flen, tstamp.full_secs, tstamp.frac_secs, true, false);      
        printf("Transmitting zeros\n");        
      } else {
        cuhd_send_timed2(uhd, preamble, flen, tstamp.full_secs, tstamp.frac_secs, true, true);      
        printf("Transmitting PRACH\n");      
      }
    }

  }
  if (f) {
    fwrite(&buffer[10*flen], flen*sizeof(cf_t), 1, f);
  }
  if (f) {
    fclose(f);
  }

  srslte_prach_free(p);
  free(p);

  printf("Done\n");
  exit(0);
}