works but color is wrong

Makefile

@@ -12,6 +12,14 @@ PROGRAMMER_ID = arduino
 # original firmware dump
 DUMP_ORI = ../../ressources/dump_atmega328p_ori.hex
 
+# Find all C source files in the current directory
+SRC = $(wildcard *.c)
+# Generate object file names from source file names
+OBJ = $(SRC:.c=.o)
+
+# Compiler flags
+CFLAGS = -mmcu=$(AVRGCC_MCU_TYPE) -D F_CPU=$(F_CPU) $(INCLUDES) -Os
+
 # Detect OS
 OS := $(shell uname -s)
 
@@ -30,13 +38,19 @@ all: hex flash
 
 hex: $(TARGET).hex
 
+# Compile each .c file to corresponding .o file
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+# Link all object files to create the binary
 # avr-gcc : compiler for AVR microcontrollers, https://gcc.gnu.org/wiki/avr-gcc#Using_avr-gcc, https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html
 #	-mmcu : the target microcontrolle (ATmega328P)
 #	-D : defines a preprocessor macro (#define F_CPU <value>)
 #	-o : output filename
-$(TARGET).bin: $(TARGET).c
-	$(CC) -mmcu=$(AVRGCC_MCU_TYPE) -D F_CPU=$(F_CPU) $(INCLUDES) $(TARGET).c -Os -o $(TARGET).bin
+$(TARGET).bin: $(OBJ)
+	$(CC) -mmcu=$(AVRGCC_MCU_TYPE) $(OBJ) -o $(TARGET).bin
 
+# Convert binary to hex for flashing
 # avr-objcopy : man avr-jobcopy, https://linux.die.net/man/1/avr-objcopy
 #	-O : specifies output format, Intel HEX
 #		some formats (list not found in any doc) :
@@ -46,6 +60,7 @@ $(TARGET).bin: $(TARGET).c
 $(TARGET).hex: $(TARGET).bin
 	avr-objcopy -O ihex $(TARGET).bin $(TARGET).hex
 
+# Flash the hex file to the microcontroller
 # avr-dude : AVR Downloader/UploaDEr, upload firmware, https://avrdudes.github.io/avrdude, v6.3 https://download-mirror.savannah.gnu.org/releases/avrdude/avrdude-doc-6.3.pdf
 #	-p : specifies the microcontroller -> m328p
 #	-c : programmer-id
@@ -60,6 +75,6 @@ restore:
 	avrdude -p $(AVRDUDE_MCU_TYPE) -c $(PROGRAMMER_ID) -b $(BAUD_RATE) -P $(SERIAL_PORT) -U flash:w:$(DUMP_ORI)
 
 clean:
-	rm -f main.hex main.bin
+	rm -f main.hex main.bin $(OBJ)
 
 .PHONY : all clean hex flash restore