[FL-1952] BLE bonding fix (#805)

* furi-hal-bt: add mutex guarding core2 state
* ble-glue: configure ble keys storage in SRAM2
* bt: add load and save ble keys in internal storage
* bt: improve work furi_hal_bt API
* bt: rework app_entry -> ble_glue
* bt: apply changes for f6 target
* desktop: remove furi check
* ble-glue: comment NVM in SRAM2 configuration
* FuriHal: fix flash controller state corruption, fix incorrect semaphore release, implement C1-C2 flash controller access according to spec. Gui: change logging level.
* Libs: better lfs integration with lfs_config.
* Ble: switch C2 NVM to RAM.
* FuriHalCrypto: ensure that core2 is alive before sending shci commands
* Ble: fix incorrect nvm buffer size

Co-authored-by: あく <alleteam@gmail.com>

applications/bt/bt_service/bt.c

@@ -1,5 +1,6 @@
 #include "bt_i.h"
 #include "battery_service.h"
+#include "bt_keys_storage.h"
 
 #define BT_SERVICE_TAG "BT"
 
@@ -161,6 +162,14 @@ static void bt_on_gap_event_callback(BleEvent event, void* context) {
     }
 }
 
+static void bt_on_key_storage_change_callback(uint8_t* addr, uint16_t size, void* context) {
+    furi_assert(context);
+    Bt* bt = context;
+    FURI_LOG_I(BT_SERVICE_TAG, "Changed addr start: %08lX, size changed: %d", addr, size);
+    BtMessage message = {.type = BtMessageTypeKeysStorageUpdated};
+    furi_check(osMessageQueuePut(bt->message_queue, &message, 0, osWaitForever) == osOK);
+}
+
 static void bt_statusbar_update(Bt* bt) {
     if(bt->status == BtStatusAdvertising) {
         view_port_set_width(bt->statusbar_view_port, icon_get_width(&I_Bluetooth_5x8));
@@ -177,7 +186,12 @@ int32_t bt_srv() {
     Bt* bt = bt_alloc();
     furi_record_create("bt", bt);
 
-    if(!furi_hal_bt_wait_startup()) {
+    // Read keys
+    if(!bt_load_key_storage(bt)) {
+        FURI_LOG_W(BT_SERVICE_TAG, "Failed to load saved bonding keys");
+    }
+    // Start 2nd core
+    if(!furi_hal_bt_start_core2()) {
         FURI_LOG_E(BT_SERVICE_TAG, "Core2 startup failed");
     } else {
         view_port_enabled_set(bt->statusbar_view_port, true);
@@ -190,6 +204,8 @@ int32_t bt_srv() {
             FURI_LOG_E(BT_SERVICE_TAG, "BT App start failed");
         }
     }
+    furi_hal_bt_set_key_storage_change_callback(bt_on_key_storage_change_callback, bt);
+
     // Update statusbar
     bt_statusbar_update(bt);
 
@@ -207,6 +223,8 @@ int32_t bt_srv() {
         } else if(message.type == BtMessageTypePinCodeShow) {
             // Display PIN code
             bt_pin_code_show_event_handler(bt, message.data.pin_code);
+        } else if(message.type == BtMessageTypeKeysStorageUpdated) {
+            bt_save_key_storage(bt);
         }
     }
     return 0;

applications/bt/bt_service/bt_i.h

@@ -25,6 +25,7 @@ typedef enum {
     BtMessageTypeUpdateStatusbar,
     BtMessageTypeUpdateBatteryLevel,
     BtMessageTypePinCodeShow,
+    BtMessageTypeKeysStorageUpdated,
 } BtMessageType;
 
 typedef union {
@@ -38,6 +39,8 @@ typedef struct {
 } BtMessage;
 
 struct Bt {
+    uint8_t* bt_keys_addr_start;
+    uint16_t bt_keys_size;
     BtSettings bt_settings;
     BtStatus status;
     osMessageQueueId_t message_queue;

applications/bt/bt_service/bt_keys_storage.c

@@ -0,0 +1,41 @@
+#include "bt_keys_storage.h"
+#include <furi.h>
+#include <file-worker.h>
+
+#define BT_KEYS_STORAGE_TAG "bt keys storage"
+#define BT_KEYS_STORAGE_PATH "/int/bt.keys"
+
+bool bt_load_key_storage(Bt* bt) {
+    furi_assert(bt);
+
+    bool file_loaded = false;
+    furi_hal_bt_get_key_storage_buff(&bt->bt_keys_addr_start, &bt->bt_keys_size);
+
+    FileWorker* file_worker = file_worker_alloc(true);
+    if(file_worker_open(file_worker, BT_KEYS_STORAGE_PATH, FSAM_READ, FSOM_OPEN_EXISTING)) {
+        furi_hal_bt_nvm_sram_sem_acquire();
+        if(file_worker_read(file_worker, bt->bt_keys_addr_start, bt->bt_keys_size)) {
+            file_loaded = true;
+        }
+        furi_hal_bt_nvm_sram_sem_release();
+    }
+    file_worker_free(file_worker);
+    return file_loaded;
+}
+
+bool bt_save_key_storage(Bt* bt) {
+    furi_assert(bt);
+    furi_assert(bt->bt_keys_addr_start);
+
+    bool file_saved = false;
+    FileWorker* file_worker = file_worker_alloc(true);
+    if(file_worker_open(file_worker, BT_KEYS_STORAGE_PATH, FSAM_WRITE, FSOM_OPEN_ALWAYS)) {
+        furi_hal_bt_nvm_sram_sem_acquire();
+        if(file_worker_write(file_worker, bt->bt_keys_addr_start, bt->bt_keys_size)) {
+            file_saved = true;
+        }
+        furi_hal_bt_nvm_sram_sem_release();
+    }
+    file_worker_free(file_worker);
+    return file_saved;
+}

applications/bt/bt_service/bt_keys_storage.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include "bt_i.h"
+
+bool bt_load_key_storage(Bt* bt);
+
+bool bt_save_key_storage(Bt* bt);