diff --git a/Core/App/global.c b/Core/App/global.c
index d726a08..637ca2a 100644
--- a/Core/App/global.c
+++ b/Core/App/global.c
@@ -2,8 +2,8 @@
 #include "global.h"
 
 GlobalData global_data = {
-    901, // freq
-    0, // freq_float
+    901 * 2, // freq
+    G_RF_MODE_FM, //rf_mode
     16, // volumn
     97 //signal
 };
diff --git a/Core/App/global.h b/Core/App/global.h
index 947ee83..ecf0f43 100644
--- a/Core/App/global.h
+++ b/Core/App/global.h
@@ -1,10 +1,12 @@
 /** Global Data Define */
 #pragma once
 #include <stdint.h>
+#define G_RF_MODE_FM 0x00
+#define G_RF_MODE_AM 0x01
 
 typedef struct GlobalData {
-    uint32_t freq;
-    uint8_t freq_float;
+    uint16_t freq; // FM x50kHz AM x1kHz
+    uint8_t rf_mode;
     uint8_t volumn;
     uint8_t signal;
 } GlobalData;
diff --git a/Makefile b/Makefile
index 81614c8..8b63699 100644
--- a/Makefile
+++ b/Makefile
@@ -20,9 +20,13 @@ TARGET = radio-gnumake
 # building variables
 ######################################
 # debug build?
-DEBUG = 1
+DEBUG ?= 1
 # optimization
-OPT = -Og
+ifeq ($(DEBUG), 1)
+	OPT = -Og
+else
+	OPT = -O3
+endif
 
 
 #######################################