Added srsLTE helper for determining number of RI bits

lib/include/srslte/phy/common/phy_common.h

@@ -451,6 +451,13 @@ SRSLTE_API const char* srslte_ack_nack_feedback_mode_string(srslte_ack_nack_feed
  */
 SRSLTE_API srslte_ack_nack_feedback_mode_t srslte_string_ack_nack_feedback_mode(const char* str);
 
+/**
+ * Returns the number of bits for Rank Indicador reporting depending on the cell
+ *
+ * @param cell
+ */
+SRSLTE_API uint32_t srslte_ri_nof_bits(const srslte_cell_t* cell);
+
 #ifdef __cplusplus
 }
 #endif

lib/src/phy/common/phy_common.c

@@ -854,4 +854,17 @@ srslte_ack_nack_feedback_mode_t srslte_string_ack_nack_feedback_mode(const char*
 
   // Otherwise Normal
   return SRSLTE_PUCCH_ACK_NACK_FEEDBACK_MODE_NORMAL;
-}
+}
+
+uint32_t srslte_ri_nof_bits(const srslte_cell_t* cell)
+{
+  uint32_t ret = 0;
+
+  if (cell->nof_ports == 2) {
+    ret = 1;
+  } else if (cell->nof_ports > 2) {
+    ret = 2;
+  }
+
+  return ret;
+}