npdsch: use r14 bcch sequence when encoding SIB

lib/src/phy/phch/npdsch.c

@@ -570,8 +570,14 @@ int srslte_npdsch_encode_rnti(srslte_npdsch_t*        q,
                               cf_t*                   sf_symbols[SRSLTE_MAX_PORTS])
 {
   if (rnti != q->rnti) {
-    srslte_sequence_t seq;
     // TODO: skip sequence init if cfg->is_encoded==true
+    srslte_sequence_t seq;
+    if (q->cell.is_r14 && rnti == SRSLTE_SIRNTI) {
+      if (srslte_sequence_npdsch_bcch_r14(
+              &seq, cfg->grant.start_sfn, q->cell.n_id_ncell, cfg->grant.nof_sf * cfg->nbits.nof_bits)) {
+        return SRSLTE_ERROR;
+      }
+    } else {
       if (srslte_sequence_npdsch(&seq,
                                  rnti,
                                  0,
@@ -581,6 +587,7 @@ int srslte_npdsch_encode_rnti(srslte_npdsch_t*        q,
                                  cfg->nbits.nof_bits * cfg->grant.nof_sf)) {
         return SRSLTE_ERROR;
       }
+    }
     int r = srslte_npdsch_encode_seq(q, cfg, softbuffer, data, &seq, sf_symbols);
     srslte_sequence_free(&seq);
     return r;