pbio/sys/storage_settings: Use bit flags instead of bit fields.

Bit fields are not guaranteed to have the same order if we write them to disk and read them back with another firmware build.

lib/pbio/include/pbsys/storage_settings.h

@@ -19,15 +19,20 @@
 #include <pbsys/config.h>
 
 /**
- * System settings. All data types are little-endian.
+ * System setting flags
  */
-typedef struct _pbsys_storage_settings_t {
-    #if PBSYS_CONFIG_BLUETOOTH_TOGGLE
+typedef enum {
     /**
-     * User has enabled Bluetooth Low Energy.
+     * Bluetooth is enabled by the user (defaults to true).
      */
-    bool bluetooth_ble_user_enabled : 1;
-    #endif // PBSYS_CONFIG_BLUETOOTH_TOGGLE
+    PBSYS_STORAGE_SETTINGS_FLAGS_BLUETOOTH_ENABLED = (1 << 0),
+} pbsys_storage_settings_flags_t;
+
+/**
+ * System settings. All data types are little-endian.
+ */
+typedef struct _pbsys_storage_settings_t {
+    uint32_t flags;
 } pbsys_storage_settings_t;
 
 #if PBSYS_CONFIG_STORAGE

lib/pbio/sys/storage_settings.c

@@ -25,7 +25,7 @@
  */
 void pbsys_storage_set_default_settings(pbsys_storage_settings_t *settings) {
     #if PBSYS_CONFIG_BLUETOOTH_TOGGLE
-    settings->bluetooth_ble_user_enabled = true;
+    settings->flags |= PBSYS_STORAGE_SETTINGS_FLAGS_BLUETOOTH_ENABLED;
     #endif
 }
 
@@ -35,7 +35,7 @@ bool pbsys_storage_settings_bluetooth_enabled(void) {
     if (!settings) {
         return true;
     }
-    return settings->bluetooth_ble_user_enabled;
+    return settings->flags & PBSYS_STORAGE_SETTINGS_FLAGS_BLUETOOTH_ENABLED;
     #else
     return true;
     #endif // PBSYS_CONFIG_BLUETOOTH_TOGGLE
@@ -55,13 +55,13 @@ void pbsys_storage_settings_bluetooth_enabled_request_toggle(void) {
         || pbdrv_bluetooth_is_connected(PBDRV_BLUETOOTH_CONNECTION_LE)
         || pbdrv_bluetooth_is_connected(PBDRV_BLUETOOTH_CONNECTION_PERIPHERAL)
         // Ignore if last request not yet finished processing.
-        || settings->bluetooth_ble_user_enabled != pbdrv_bluetooth_is_ready()
+        || pbsys_storage_settings_bluetooth_enabled() != pbdrv_bluetooth_is_ready()
         ) {
         return;
     }
 
     // Toggle the user enabled state and poll process to take action.
-    settings->bluetooth_ble_user_enabled = !settings->bluetooth_ble_user_enabled;
+    settings->flags ^= PBSYS_STORAGE_SETTINGS_FLAGS_BLUETOOTH_ENABLED;
     pbsys_storage_request_write();
     pbsys_bluetooth_process_poll();
     #endif