Rename folder of firmware written in c

To establish a better naming convention for firmwares written in other
languages.

firmware/c/Makefile

@@ -0,0 +1,55 @@
+.SUFFIXES:
+
+MCU := atmega328p
+PROGRAMMER := usbasp
+SPEED := 8000000UL
+
+TARGET := main.hex
+EEP := main.eep
+BIN := main.elf
+OBJ := main.o
+
+LOW_FUSE := 0xE2
+HIGH_FUSE := 0xD6
+
+SHELL := sh
+CC := avr-gcc
+OBJCOPY := avr-objcopy
+SIZE := avr-size
+AVRDUDE := avrdude
+
+CFLAGS := -mmcu=$(MCU) -D F_CPU=$(SPEED) -Os -Wall -Werror -Wextra -Wpedantic
+
+all: $(TARGET) $(EEP)
+
+$(TARGET): $(BIN)
+	${OBJCOPY} -O ihex -j .text -j .data $< $@
+
+$(EEP): $(BIN)
+	${OBJCOPY} --change-section-lma .eeprom=0 -O ihex -j .eeprom $< $@
+
+$(BIN): $(OBJ)
+	$(CC) $(CFLAGS) $< -o $@
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+.PHONY: flash eeprom fuses clean check size
+
+flash: $(TARGET) size
+	$(AVRDUDE) -p $(MCU) -c $(PROGRAMMER) -U flash:w:$<:a
+
+eeprom: $(EEP) size
+	$(AVRDUDE) -p $(MCU) -c $(PROGRAMMER) -U eeprom:w:$<:a
+
+fuses:
+	$(AVRDUDE) -p $(MCU) -c $(PROGRAMMER) -U lfuse:w:$(LOW_FUSE):m -U hfuse:w:$(HIGH_FUSE):m
+
+clean:
+	$(RM) $(TARGET) $(EEP) $(BIN) $(OBJ)
+
+check:
+	cppcheck main.c
+
+size: $(BIN)
+	$(SIZE) --format=avr --mcu=$(MCU) $<