diff --git a/74C922.h b/74C922.h
index a7ac22c..cda3d20 100644
--- a/74C922.h
+++ b/74C922.h
@@ -1,6 +1,7 @@
 #ifndef H74C922_H
 #define H74C922_H
 #include <stdint.h>
+#include <stdbool.h>
 
 // Pin Definitions
 #define ENCODER_A_PIN  PD6
diff --git a/GDM1602K.c b/GDM1602K.c
index b642f70..8c442ff 100644
--- a/GDM1602K.c
+++ b/GDM1602K.c
@@ -58,10 +58,10 @@ void lcd_init() {
     lcd_4bit_init();
 
     // lcd_send(1, 0b01111000);
-    lcd_send(0, 0x01);       // Clear screen
-    lcd_send(0, 0x02);       // Return home
-    lcd_send(0, 0b00001100); // Display on, no cursor
-    lcd_send(0, 0b00101000);
+    lcd_send(0, 0x01); // Clear screen
+    lcd_send(0, 0x02); // Return home
+    lcd_send(0, 0xC);  // Display on, no cursor
+    lcd_send(0, 0x28);
 }
 
 void lcd_clear() { lcd_send(0, 0x01); }
diff --git a/makefile b/Makefile
similarity index 82%
rename from makefile
rename to Makefile
index 0503c93..e45edf9 100644
--- a/makefile
+++ b/Makefile
@@ -9,7 +9,11 @@ MCU = atmega1284p
 QEMU_MACHINE_NAME = mega
 
 # Compiler flags
-CFLAGS = -std=c2x -Wall -Wno-array-bounds -mmcu=$(MCU) -DF_CPU=16000000UL -O3
+CFLAGS = -std=c99 -Wall -Wextra -Wpedantic -Wno-array-bounds -mmcu=$(MCU) \
+		 -DF_CPU=16000000UL -O2 -fno-common -ffunction-sections -fdata-sections
+
+# For debug
+CFLAGS += -g3 -DDEBUG
 
 # Source files
 SRCS = $(wildcard *.c)
@@ -34,6 +38,7 @@ $(TARGET).elf: $(OBJS)
 # Convert ELF to HEX
 $(TARGET).hex: $(TARGET).elf
 	avr-objcopy -O ihex -R .eeprom $(TARGET).elf $(TARGET).hex
+	avr-size $<
 
 # Flash the program
 flash: $(TARGET).hex