Bluetooth: controller: Fix error when max ant. pattern len not defined

Fix compilation error if CONFIG_BT_CTLR_DF is not defined.
If DF was not enabled, there was missing CONFIG_BT_CTLR_DF_MAX_-
ANT_SW_PATTERN_LEN and undeclared symbol was found.

Split ll_df.h into two parts:
- ll_df.h that is generally includeable and allows to successfully
  compile sources when DF is not enabled.
- ll_df_internal.h to be used in soucres that are compiled when
  DF is enabled.

Signed-off-by: Piotr Pryga <[email protected]>

Author: ppryga-nordic

subsys/bluetooth/controller/ll_sw/lll_df.h

@@ -4,26 +4,5 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-/* @brief Configuration of Constant Tone Extension for connectionless
- * transmission.
- */
-struct lll_df_adv_cfg {
-	uint8_t is_enabled:1;
-	uint8_t cte_length:6;   /* Length of CTE in 8us units */
-	uint8_t cte_type:2;
-	uint8_t cte_count:6;
-	uint8_t ant_sw_len:6;
-	uint8_t ant_ids[CONFIG_BT_CTLR_DF_MAX_ANT_SW_PATTERN_LEN];
-};
-
-/* @brief Min supported length of antenna switching pattern */
-#define LLL_DF_MIN_ANT_PATTERN_LEN 3
-
-/* @brief Max supported CTE length in 8us units */
-#define LLL_DF_MAX_CTE_LEN 20
-
 int lll_df_init(void);
 int lll_df_reset(void);
-
-/* Provides number of available antennas for Direction Finding */
-uint8_t lll_df_ant_num_get(void);

subsys/bluetooth/controller/ll_sw/lll_df_internal.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2020 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* @brief Configuration of Constant Tone Extension for connectionless
+ * transmission.
+ */
+struct lll_df_adv_cfg {
+	uint8_t is_enabled:1;
+	uint8_t is_started:1;
+	uint8_t cte_length:6;   /* Length of CTE in 8us units */
+	uint8_t cte_type:2;
+	uint8_t cte_count:6;
+	uint8_t ant_sw_len:6;
+	uint8_t ant_ids[CONFIG_BT_CTLR_DF_MAX_ANT_SW_PATTERN_LEN];
+};
+
+/* @brief Max supported CTE length in 8us units */
+#define LLL_DF_MAX_CTE_LEN 20
+/* @brief Min supported CTE length in 8us units */
+#define LLL_DF_MIN_CTE_LEN 2
+
+/* @brief Min supported length of antenna switching pattern */
+#define LLL_DF_MIN_ANT_PATTERN_LEN 3
+
+/* Provides number of available antennae for Direction Finding */
+uint8_t lll_df_ant_num_get(void);

subsys/bluetooth/controller/ll_sw/ull_df.c

@@ -25,7 +25,7 @@
 #include "ull_adv_internal.h"
 
 #include "ull_df.h"
-#include "lll_df.h"
+#include "lll_df_internal.h"
 
 #define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_HCI_DRIVER)
 #define LOG_MODULE_NAME bt_ctlr_ull_df