From f9aafd00a76a0edcb13ee5f213596fa38e713403 Mon Sep 17 00:00:00 2001
From: Xavier Arteaga <xavier@softwareradiosystems.com>
Date: Mon, 17 May 2021 17:12:15 +0200
Subject: [PATCH] Added subcarrier spacing parsing from string

---
 lib/include/srsran/phy/common/phy_common_nr.h |  7 +++++
 lib/src/phy/common/phy_common_nr.c            | 30 +++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/lib/include/srsran/phy/common/phy_common_nr.h b/lib/include/srsran/phy/common/phy_common_nr.h
index 4db58736c..1fb15d410 100644
--- a/lib/include/srsran/phy/common/phy_common_nr.h
+++ b/lib/include/srsran/phy/common/phy_common_nr.h
@@ -594,6 +594,13 @@ SRSRAN_API int srsran_carrier_to_cell(const srsran_carrier_nr_t* carrier, srsran
  */
 SRSRAN_API uint32_t srsran_csi_meas_info(const srsran_csi_trs_measurements_t* meas, char* str, uint32_t str_len);
 
+/**
+ * @brief Converts a given string into a subcarrier spacing
+ * @param str Provides the string
+ * @return A valid subcarrier if the string is valid, srsran_subcarrier_spacing_invalid otherwise
+ */
+SRSRAN_API srsran_subcarrier_spacing_t srsran_subcarrier_spacing_from_str(const char* str);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/src/phy/common/phy_common_nr.c b/lib/src/phy/common/phy_common_nr.c
index bc829d0e6..2f206ef62 100644
--- a/lib/src/phy/common/phy_common_nr.c
+++ b/lib/src/phy/common/phy_common_nr.c
@@ -12,6 +12,7 @@
 
 #include "srsran/phy/common/phy_common_nr.h"
 #include "srsran/phy/utils/vector.h"
+#include <stdlib.h>
 #include <string.h>
 
 const char* srsran_rnti_type_str(srsran_rnti_type_t rnti_type)
@@ -321,3 +322,32 @@ uint32_t srsran_csi_meas_info(const srsran_csi_trs_measurements_t* meas, char* s
                             meas->cfo_hz,
                             meas->delay_us);
 }
+
+srsran_subcarrier_spacing_t srsran_subcarrier_spacing_from_str(const char* str)
+{
+  if (str == NULL) {
+    return srsran_subcarrier_spacing_invalid;
+  }
+
+  uint32_t scs = (uint32_t)roundf(strtof(str, NULL));
+  switch (scs) {
+    case 15:
+    case 15000:
+      return srsran_subcarrier_spacing_15kHz;
+    case 30:
+    case 30000:
+      return srsran_subcarrier_spacing_30kHz;
+    case 60:
+    case 60000:
+      return srsran_subcarrier_spacing_60kHz;
+    case 120:
+    case 120000:
+      return srsran_subcarrier_spacing_120kHz;
+    case 240:
+    case 240000:
+      return srsran_subcarrier_spacing_240kHz;
+    default:; // Do nothing
+  }
+
+  return srsran_subcarrier_spacing_invalid;
+}