feat(ble): add channel assessment and enhanced connect function on ESP32-C6

(cherry picked from commit 821e587)

Co-authored-by: zwl <zhaoweiliang@espressif.com>

Author: Zhou Xiao

components/bt/controller/esp32c6/Kconfig.in

@@ -748,3 +748,48 @@ config BT_CTRL_RUN_IN_FLASH_ONLY
         Move most IRAM into flash. This will increase the usage of flash and reduce ble performance.
         Because the code is moved to the flash, the execution speed of the code is reduced.
         To have a small impact on performance, you need to enable flash suspend (SPI_FLASH_AUTO_SUSPEND).
+
+menu "BLE disconnects when Instant Passed (0x28) occurs"
+    config BT_LE_CTRL_LLCP_CONN_UPDATE
+        bool "BLE ACL connection update procedure"
+        default n
+        help
+            If this option is enabled, Controller will terminate the connection
+            when Instant Passed (0x28) error occurs during connection update procedure.
+
+    config BT_LE_CTRL_LLCP_CHAN_MAP_UPDATE
+        bool "BLE ACL channel map update procedure"
+        default n
+        help
+            If this option is enabled, Controller will terminate the connection
+            when Instant Passed (0x28) error occurs in channel map update procedure.
+
+    config BT_LE_CTRL_LLCP_PHY_UPDATE
+        bool "BLE ACL PHY update procedure"
+        default n
+        help
+            If this option is enabled, Controller will terminate the connection
+            when Instant Passed (0x28) error occurs in PHY update procedure.
+endmenu
+
+config BT_CTRL_SCAN_BACKOFF_UPPERLIMITMAX
+    int "The value of upperlimitmax during scan backoff procedure"
+    range 1 256
+    default 32
+    help
+        The value of upperlimitmax needs to be a power of 2.
+
+config BT_LE_CTRL_CHAN_ASS_EN
+    bool "Enable channel assessment"
+    default n
+    help
+        If this option is enabled, The Controller will records the communication quality
+        for each channel and then start a timer to check and update the channel map every 4 seconds.
+
+config BT_LE_CTRL_ADV_DATA_LENGTH_ZERO_AUX
+    bool "Enable aux packet when ext adv data length is zero"
+    default y
+    help
+        When this option is enabled, auxiliary packets will be present in the events of
+        'Non-Connectable and Non-Scannable' regardless of whether the advertising length is 0.
+        If this option is not enabled, auxiliary packets will only be present when the advertising length is not 0.

components/bt/controller/esp32c6/esp_bt_cfg.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -154,6 +154,44 @@ extern "C" {
 #define DEFAULT_BT_LE_CTRL_CHECK_CONNECT_IND_ACCESS_ADDRESS  (0)
 #endif
 
+#ifdef CONFIG_BT_LE_CTRL_LLCP_CONN_UPDATE
+#define BT_CTRL_BLE_LLCP_CONN_UPDATE (1<<0)
+#else
+#define BT_CTRL_BLE_LLCP_CONN_UPDATE (0<<0)
+#endif
+
+#ifdef CONFIG_BT_LE_CTRL_LLCP_CHAN_MAP_UPDATE
+#define BT_CTRL_BLE_LLCP_CHAN_MAP_UPDATE (1<<1)
+#else
+#define BT_CTRL_BLE_LLCP_CHAN_MAP_UPDATE (0<<1)
+#endif
+
+#ifdef CONFIG_BT_LE_CTRL_LLCP_PHY_UPDATE
+#define BT_CTRL_BLE_LLCP_PHY_UPDATE (1<<2)
+#else
+#define BT_CTRL_BLE_LLCP_PHY_UPDATE (0<<2)
+#endif
+
+#define BT_LE_CTRL_LLCP_DISC_FLAG (BT_CTRL_BLE_LLCP_CONN_UPDATE | BT_CTRL_BLE_LLCP_CHAN_MAP_UPDATE | BT_CTRL_BLE_LLCP_PHY_UPDATE)
+
+#ifdef CONFIG_BT_CTRL_SCAN_BACKOFF_UPPERLIMITMAX
+#define BT_CTRL_SCAN_BACKOFF_UPPERLIMITMAX          (CONFIG_BT_CTRL_SCAN_BACKOFF_UPPERLIMITMAX)
+#else
+#define BT_CTRL_SCAN_BACKOFF_UPPERLIMITMAX          (256)
+#endif
+
+#if defined(CONFIG_BT_LE_CTRL_CHAN_ASS_EN)
+#define DEFAULT_BT_LE_CTRL_CHAN_ASS_EN (CONFIG_BT_LE_CTRL_CHAN_ASS_EN)
+#else
+#define DEFAULT_BT_LE_CTRL_CHAN_ASS_EN (0)
+#endif
+
+#if defined(CONFIG_BT_LE_CTRL_ADV_DATA_LENGTH_ZERO_AUX)
+#define DEFAULT_BT_LE_CTRL_ADV_DATA_LENGTH_ZERO_AUX (CONFIG_BT_LE_CTRL_ADV_DATA_LENGTH_ZERO_AUX)
+#else
+#define DEFAULT_BT_LE_CTRL_ADV_DATA_LENGTH_ZERO_AUX (0)
+#endif
+
 #ifdef CONFIG_BT_LE_HCI_INTERFACE_USE_UART
 #define HCI_UART_EN CONFIG_BT_LE_HCI_INTERFACE_USE_UART
 #else

components/bt/include/esp32c6/include/esp_bt.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -156,7 +156,7 @@ esp_err_t esp_ble_tx_power_set_enhanced(esp_ble_enhanced_power_type_t power_type
  */
 esp_power_level_t esp_ble_tx_power_get_enhanced(esp_ble_enhanced_power_type_t power_type, uint16_t handle);
 
-#define CONFIG_VERSION  0x20241121
+#define CONFIG_VERSION  0x20250104
 #define CONFIG_MAGIC    0x5A5AA5A5
 
 /**
@@ -215,6 +215,15 @@ typedef struct {
     uint8_t csa2_select;                             /*!< Select CSA#2*/
     uint8_t enable_csr;                              /*!< Enable CSR */
     uint8_t ble_aa_check;                            /*!< True if adds a verification step for the Access Address within the CONNECT_IND PDU; false otherwise. Configurable in menuconfig */
+    uint8_t ble_llcp_disc_flag;                      /*!< Flag indicating whether the Controller disconnects after Instant Passed (0x28) error occurs. Configurable in menuconfig.
+                                                        - The Controller does not disconnect after Instant Passed (0x28) by default. */
+    uint16_t scan_backoff_upperlimitmax;             /*!< The value of upperlimitmax is 2^n, The maximum value is 256 */
+    uint8_t ble_chan_ass_en;                         /*!< Enable / disable BLE channel assessment. Configurable in menuconfig.
+                                                        - 0 - Disable
+                                                        - 1 - Enable (default) */
+    uint8_t ble_data_lenth_zero_aux;                 /*!< Enable / disable auxiliary packets when the extended ADV data length is zero. Configurable in menuconfig.
+                                                        - 0 - Disable (default)
+                                                        - 1 - Enable */
     uint32_t config_magic;                           /*!< Magic number for configuration validation */
 } esp_bt_controller_config_t;
 
@@ -266,6 +275,10 @@ typedef struct {
     .csa2_select                = DEFAULT_BT_LE_50_FEATURE_SUPPORT,                     \
     .enable_csr                 = 0,                                                    \
     .ble_aa_check               = DEFAULT_BT_LE_CTRL_CHECK_CONNECT_IND_ACCESS_ADDRESS,  \
+    .ble_llcp_disc_flag         = BT_LE_CTRL_LLCP_DISC_FLAG,                            \
+    .scan_backoff_upperlimitmax = BT_CTRL_SCAN_BACKOFF_UPPERLIMITMAX,                   \
+    .ble_chan_ass_en            = DEFAULT_BT_LE_CTRL_CHAN_ASS_EN,                       \
+    .ble_data_lenth_zero_aux    = DEFAULT_BT_LE_CTRL_ADV_DATA_LENGTH_ZERO_AUX,          \
     .config_magic = CONFIG_MAGIC,                                                       \
 }
 #elif CONFIG_IDF_TARGET_ESP32C61
@@ -315,6 +328,10 @@ typedef struct {
     .csa2_select                = DEFAULT_BT_LE_50_FEATURE_SUPPORT,                     \
     .enable_csr                 = 0,                                                    \
     .ble_aa_check               = DEFAULT_BT_LE_CTRL_CHECK_CONNECT_IND_ACCESS_ADDRESS,  \
+    .ble_llcp_disc_flag         = BT_LE_CTRL_LLCP_DISC_FLAG,                            \
+    .scan_backoff_upperlimitmax = BT_CTRL_SCAN_BACKOFF_UPPERLIMITMAX,                   \
+    .ble_chan_ass_en            = DEFAULT_BT_LE_CTRL_CHAN_ASS_EN,                       \
+    .ble_data_lenth_zero_aux    = DEFAULT_BT_LE_CTRL_ADV_DATA_LENGTH_ZERO_AUX,          \
     .config_magic = CONFIG_MAGIC,                                                       \
 }
 #endif