diff --git a/firmware/application/src/rfid/nfctag/tag_emulation.h b/firmware/application/src/rfid/nfctag/tag_emulation.h
index 1be4573..789424f 100644
--- a/firmware/application/src/rfid/nfctag/tag_emulation.h
+++ b/firmware/application/src/rfid/nfctag/tag_emulation.h
@@ -5,12 +5,11 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+#include "utils.h"
 #include "tag_base_type.h"
 
 // 最多八张卡槽
 #define TAG_MAX_SLOT_NUM    8
-// u32 size align.
-#define ALIGN_U32  __attribute__((aligned(4)))
 
 extern bool g_is_tag_emulating;
 
diff --git a/firmware/application/src/settings.c b/firmware/application/src/settings.c
index 52db9bf..73cd281 100644
--- a/firmware/application/src/settings.c
+++ b/firmware/application/src/settings.c
@@ -53,11 +53,10 @@ uint8_t settings_save_config(void)
 
 uint8_t settings_get_animation_config()
 {
-    return config & 0x3;
+    return config.animation_config;
 }
 
 void settings_set_animation_config(uint8_t value)
 {
-    config &= ~(0x3);
-    config |= value;
+    config.animation_config = value;
 }
diff --git a/firmware/application/src/settings.h b/firmware/application/src/settings.h
index a42baa3..b0dcadd 100644
--- a/firmware/application/src/settings.h
+++ b/firmware/application/src/settings.h
@@ -3,15 +3,17 @@
 
 #include <stdint.h>
 
+#include "utils.h"
+
 #define SETTINGS_ANIMATION_FULL 0
 #define SETTINGS_ANIMATION_MINIMAL 1
 #define SETTINGS_ANIMATION_NONE 2
 
-/*
- * bits [0-1]: animation config
- * bits [2-31]: reserved
- */
-typedef uint32_t settings_data_t;
+
+typedef struct ALIGN_U32 {
+    uint16_t version;
+    uint16_t animation_config : 2;
+} settings_data_t;
 
 void settings_load_config(void);
 uint8_t settings_save_config(void);
diff --git a/firmware/common/utils.h b/firmware/common/utils.h
new file mode 100644
index 0000000..00ecf46
--- /dev/null
+++ b/firmware/common/utils.h
@@ -0,0 +1,7 @@
+#ifndef UTILS_H_
+#define UTILS_H_
+
+// u32 size align.
+#define ALIGN_U32  __attribute__((aligned(4)))
+
+#endif
\ No newline at end of file