Changing microcontroller to correct one (ATmega328p).

Changing frequency to 16 MHz.
Adding make target "flash" for flashing produced .hex file.

Makefile

@@ -3,8 +3,8 @@ BUILDFOLDER = ./build/
 TARGET = $(BUILDFOLDER)$(TARGETNAME)
 
 INC = -Isrc/include -I/usr/lib/avr/include/
-CFLAGS = -Wall -Wpedantic -Wextra -g -Os -mmcu=atmega32u4
-CPPFLAGS = -DF_CPU=8000000UL
+CFLAGS = -Wall -Wpedantic -Wextra -g -Os -mmcu=atmega328p
+CPPFLAGS = -DF_CPU=16000000UL
 
 SRC = $(wildcard src/*.c)
 
@@ -14,6 +14,10 @@ $(TARGET): $(SRC)
 	mkdir -p build
 	avr-gcc -o $@.elf $^ $(CPPFLAGS) $(CFLAGS) $(INC)
 	avr-objcopy -j .text -j .data -O ihex $@.elf $@.hex
+	rm $@.elf
+
+flash:
+	avrdude -p m328p -P /dev/ttyUSB0 -c arduino -b 57600 -Uflash:w:"$(TARGET).hex":i
 
 clean:
 	rm -fr ./src/*.o ./build/