feat(ble): Support for putting code in flash on ESP32-C2

(cherry picked from commit 192f13135488a2f8a386ace2dad69da59e81f5b5)

Co-authored-by: Shen Weilong <shenweilong@espressif.com>

Author: ShenWeilong

components/bt/CMakeLists.txt

@@ -85,6 +85,9 @@ if(CONFIG_BT_ENABLED)
         elseif(CONFIG_IDF_TARGET_ESP32S3)
             list(APPEND ldscripts "linker_rw_bt_controller.lf")
         elseif(CONFIG_IDF_TARGET_ESP32C2)
+            if(CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY)
+                list(APPEND srcs "controller/esp32c2/dummy.c")
+            endif()
             set(ldscripts "linker_esp32c2.lf")
         else()
             list(APPEND ldscripts "linker_esp_ble_controller.lf")
@@ -886,8 +889,13 @@ if(CONFIG_BT_ENABLED)
             add_prebuilt_library(libble_app
                 "${CMAKE_CURRENT_LIST_DIR}/controller/lib_esp32c6/esp32c6-bt-lib/esp32c61/libble_app.a")
         else()
-            add_prebuilt_library(libble_app
-                 "controller/lib_${target_name}/${target_name}-bt-lib/libble_app.a")
+            if(CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY)
+                add_prebuilt_library(libble_app
+                    "controller/lib_${target_name}/${target_name}-bt-lib/libble_app_flash.a")
+            else()
+                add_prebuilt_library(libble_app
+                    "controller/lib_${target_name}/${target_name}-bt-lib/libble_app.a")
+            endif()
         endif()
         target_link_libraries(${COMPONENT_LIB} PRIVATE libble_app)
     endif()

components/bt/controller/esp32c2/Kconfig.in

@@ -109,85 +109,99 @@ menuconfig BT_LE_50_FEATURE_SUPPORT
     help
         Enable BLE 5 feature
 
-config BT_LE_LL_CFG_FEAT_LE_2M_PHY
-    bool "Enable 2M Phy"
-    depends on BT_LE_50_FEATURE_SUPPORT
-    default y
-    help
-        Enable 2M-PHY
-
-config BT_LE_LL_CFG_FEAT_LE_CODED_PHY
-    bool "Enable coded Phy"
-    depends on BT_LE_50_FEATURE_SUPPORT
-    default y
-    help
-        Enable coded-PHY
-
-config BT_LE_EXT_ADV
-    bool "Enable extended advertising"
-    depends on BT_LE_50_FEATURE_SUPPORT
-    default y
-    help
-        Enable this option to do extended advertising. Extended advertising
-        will be supported from BLE 5.0 onwards.
-
-if BT_LE_EXT_ADV
-    config BT_LE_MAX_EXT_ADV_INSTANCES
-        int "Maximum number of extended advertising instances."
-        range 0 4
-        default 1
-        depends on BT_LE_EXT_ADV
-        help
-            Change this option to set maximum number of extended advertising
-            instances. Minimum there is always one instance of
-            advertising. Enter how many more advertising instances you
-            want.
-            Each extended advertising instance will take about 0.5k DRAM.
-
-    config BT_LE_EXT_ADV_MAX_SIZE
-        int "Maximum length of the advertising data."
-        range 0 1650
-        default 1650
-        depends on BT_LE_EXT_ADV
+if BT_LE_50_FEATURE_SUPPORT
+    config BT_LE_LL_CFG_FEAT_LE_2M_PHY
+        bool "Enable 2M Phy"
+        depends on BT_LE_50_FEATURE_SUPPORT
+        default y
         help
-            Defines the length of the extended adv data. The value should not
-            exceed 1650.
+            Enable 2M-PHY
 
-    config BT_LE_ENABLE_PERIODIC_ADV
-        bool "Enable periodic advertisement."
+    config BT_LE_LL_CFG_FEAT_LE_CODED_PHY
+        bool "Enable coded Phy"
+        depends on BT_LE_50_FEATURE_SUPPORT
         default y
-        depends on BT_LE_EXT_ADV
         help
-            Enable this option to start periodic advertisement.
+            Enable coded-PHY
 
-    config BT_LE_PERIODIC_ADV_SYNC_TRANSFER
-        bool "Enable Transfer Sync Events"
-        depends on BT_LE_ENABLE_PERIODIC_ADV
+    config BT_LE_EXT_ADV
+        bool "Enable extended advertising"
+        depends on BT_LE_50_FEATURE_SUPPORT
         default y
         help
-            This enables controller transfer periodic sync events to host
+            Enable this option to do extended advertising. Extended advertising
+            will be supported from BLE 5.0 onwards.
+
+    if BT_LE_EXT_ADV
+        config BT_LE_MAX_EXT_ADV_INSTANCES
+            int "Maximum number of extended advertising instances."
+            range 0 4
+            default 1
+            depends on BT_LE_EXT_ADV
+            help
+                Change this option to set maximum number of extended advertising
+                instances. Minimum there is always one instance of
+                advertising. Enter how many more advertising instances you
+                want.
+                Each extended advertising instance will take about 0.5k DRAM.
+
+        config BT_LE_EXT_ADV_MAX_SIZE
+            int "Maximum length of the advertising data."
+            range 0 1650
+            default 1650
+            depends on BT_LE_EXT_ADV
+            help
+                Defines the length of the extended adv data. The value should not
+                exceed 1650.
 
-endif
+        config BT_LE_ENABLE_PERIODIC_ADV
+            bool "Enable periodic advertisement."
+            default y
+            depends on BT_LE_EXT_ADV
+            help
+                Enable this option to start periodic advertisement.
 
-config BT_LE_MAX_PERIODIC_SYNCS
-    int "Maximum number of periodic advertising syncs"
-    depends on BT_LE_50_FEATURE_SUPPORT && !BT_NIMBLE_ENABLED
+        config BT_LE_PERIODIC_ADV_SYNC_TRANSFER
+            bool "Enable Transfer Sync Events"
+            depends on BT_LE_ENABLE_PERIODIC_ADV
+            default y
+            help
+                This enables controller transfer periodic sync events to host
+    endif
 
-    range 0 3
-    default 1 if BT_LE_ENABLE_PERIODIC_ADV
-    default 0
-    help
-        Set this option to set the upper limit for number of periodic sync
-        connections. This should be less than maximum connections allowed by
-        controller.
+    config BT_LE_EXT_SCAN
+        bool "Enable extended scanning"
+        depends on BT_LE_50_FEATURE_SUPPORT && BT_LE_ROLE_OBSERVER_ENABLE
+        default y
+        help
+            Enable this option to do extended scanning.
 
-config BT_LE_MAX_PERIODIC_ADVERTISER_LIST
-    int "Maximum number of periodic advertiser list"
-    depends on BT_LE_50_FEATURE_SUPPORT && !BT_NIMBLE_ENABLED
-    range 1 5
-    default 5
-    help
-        Set this option to set the upper limit for number of periodic advertiser list.
+    config BT_LE_ENABLE_PERIODIC_SYNC
+        bool "Enable periodic sync"
+        default y
+        depends on BT_LE_EXT_SCAN
+        help
+            Enable this option to receive periodic advertisement.
+
+    if BT_LE_ENABLE_PERIODIC_SYNC
+        config BT_LE_MAX_PERIODIC_SYNCS
+            int "Maximum number of periodic advertising syncs"
+            range 0 3
+            default 1 if BT_LE_ENABLE_PERIODIC_ADV
+            default 0
+            help
+                Set this option to set the upper limit for number of periodic sync
+                connections. This should be less than maximum connections allowed by
+                controller.
+
+        config BT_LE_MAX_PERIODIC_ADVERTISER_LIST
+            int "Maximum number of periodic advertiser list"
+            range 1 5
+            default 5
+            help
+                Set this option to set the upper limit for number of periodic advertiser list.
+    endif
+endif
 
 menu "Memory Settings"
     depends on !BT_NIMBLE_ENABLED
@@ -523,6 +537,10 @@ config BT_LE_TX_CCA_ENABLED
     help
         Enable CCA feature to cancel sending the packet if the signal power is stronger than CCA threshold.
 
+config BT_LE_DTM_ENABLED
+    bool "Enable Direct Test Mode (DTM) feature"
+    default n
+
 config BT_LE_CCA_RSSI_THRESH
     int "CCA RSSI threshold value"
     depends on BT_LE_TX_CCA_ENABLED
@@ -531,6 +549,10 @@ config BT_LE_CCA_RSSI_THRESH
     help
         Power threshold of CCA in unit of -1 dBm.
 
+config BT_LE_FEAT_LL_ENCRYPTION
+    bool "Enable controller ACL encryption"
+    default y
+
 config BT_LE_ROLE_CENTROL_ENABLE
     bool "Enable BLE Centrol role function"
     depends on !BT_NIMBLE_ENABLED
@@ -617,3 +639,23 @@ config BT_LE_DFT_TX_POWER_LEVEL_DBM_EFF
     default 18 if BT_LE_DFT_TX_POWER_LEVEL_P18
     default 20 if BT_LE_DFT_TX_POWER_LEVEL_P20
     default 0
+
+config BT_CTRL_RUN_IN_FLASH_ONLY
+    bool "Reduce BLE IRAM usage (READ DOCS FIRST) (EXPERIMENTAL)"
+    default n
+    help
+        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).
+
+        - Only one Tx-Rx can be performed in each connection interval. Therefore, reduce the connection interval
+          as much as possible to improve the throughput. If you want higher connection performance, you can
+          enable BT_LE_PLACE_CONN_RELATED_INTO_IRAM to put the connection-related code into iram.
+        - For HCI_LE_Extended_Create_Connection command, only 1M phy's connection parameters will be applied.
+          Other phys' will be ignored.
+        - For extended scanning, we may be unable to receive the extended adv with 300us MAFS.
+
+config BT_LE_PLACE_CONN_RELATED_INTO_IRAM
+    bool "Place the connection-related code into IRAM"
+    depends on BT_CTRL_RUN_IN_FLASH_ONLY
+    default n

components/bt/controller/esp32c2/bt.c

@@ -156,6 +156,10 @@ extern int ble_get_npl_element_info(esp_bt_controller_config_t *cfg, ble_npl_cou
 extern void bt_track_pll_cap(void);
 extern char *ble_controller_get_compile_version(void);
 extern const char *r_ble_controller_get_rom_compile_version(void);
+#if CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
+extern void ble_ll_supported_features_init(void);
+#endif //CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
+
 #if CONFIG_BT_RELEASE_IRAM
 extern uint32_t _iram_bt_text_start;
 extern uint32_t _bss_bt_end;
@@ -534,7 +538,12 @@ static int esp_ecc_gen_dh_key(const uint8_t *peer_pub_key_x, const uint8_t *peer
 
 static int esp_intr_alloc_wrapper(int source, int flags, intr_handler_t handler, void *arg, void **ret_handle_in)
 {
+#if CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
+    int rc = esp_intr_alloc(source, flags, handler, arg, (intr_handle_t *)ret_handle_in);
+#else
     int rc = esp_intr_alloc(source, flags | ESP_INTR_FLAG_IRAM, handler, arg, (intr_handle_t *)ret_handle_in);
+#endif
+
     return rc;
 }
 
@@ -743,6 +752,8 @@ esp_err_t esp_bt_controller_init(esp_bt_controller_config_t *cfg)
         return ret;
     }
 
+    /* If we place the ble code into flash, don't need to initialize ROM. */
+#if !CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
 #if DEFAULT_BT_LE_50_FEATURE_SUPPORT || DEFAULT_BT_LE_ROLE_CENTROL || DEFAULT_BT_LE_ROLE_OBSERVER
     extern int esp_ble_rom_func_ptr_init_all(void);
     esp_ble_rom_func_ptr_init_all();
@@ -751,6 +762,7 @@ esp_err_t esp_bt_controller_init(esp_bt_controller_config_t *cfg)
     extern int esp_ble_rom_func_ptr_init_legacy_adv_and_slave(void);
     esp_ble_rom_func_ptr_init_legacy_adv_and_slave();
 #endif
+#endif //!CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
 
     /* Initialize the function pointers for OS porting */
     npl_freertos_funcs_init();
@@ -800,6 +812,11 @@ esp_err_t esp_bt_controller_init(esp_bt_controller_config_t *cfg)
 #if CONFIG_SW_COEXIST_ENABLE
     coex_init();
 #endif
+
+#if CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
+    ble_ll_supported_features_init();
+#endif //CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
+
     ret = ble_controller_init(cfg);
     if (ret != ESP_OK) {
         ESP_LOGW(NIMBLE_PORT_LOG_TAG, "ble_controller_init failed %d", ret);