Add Makefile

Makefile

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+###############################################################################
+#
+# Simple Makefile for Arduino MEGA 2560 C projects
+#
+###############################################################################
+
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+AVRDUDE = avrdude
+CODE_FORMATTER = tooling/format-code.sh
+
+BOARD = atmega2560
+
+# Use shell command export to define it
+# Example: export ARDUINO=/dev/ttyACM0
+DEVICE = $(ARDUINO)
+
+# Build artifacts
+BINDIR = bin
+TARGET = $(BINDIR)/$(BOARD)-user-code.ihx
+ELF = $(BINDIR)/$(BOARD)-user-code.elf
+
+# Source files. wildard "uses" all .c files in src directory
+SRCDIR = src
+SRC = $(wildcard $(SRCDIR)/*.c)
+
+# Define object files from .c files defined above
+OBJ=$(SRC:.c=.o)
+
+# Compiler flags
+# Note that those beginning with -D are acctually pre-processor macros
+# -Wall ... -Wfatal-errors All possible warning options
+# -Os Optimize code. The special option -Os is meant to turn on all -O2
+# optimizations that are not expected to increase code size.
+# -std=c11 use C11 standard
+CFLAGS =	-Wall \
+			-Wextra \
+			-Wpedantic \
+			-Wformat \
+			-pedantic-errors \
+			-Werror \
+			-Wfatal-errors \
+			-Os \
+			-mmcu=$(BOARD) \
+			-DF_CPU=16000000UL \
+			-DGIT_SHA=\"$(shell git describe --abbrev=6 --dirty --always --tags)\" \
+			-std=c11
+
+# Linker flags
+LDFLAGS = -mmcu=$(BOARD)
+
+OBJCOPYARGS =	-O ihex \
+				-R .eeprom
+
+AVRDUDEARGS =	-p $(BOARD) \
+				-c wiring \
+				-F \
+				-P $(DEVICE) \
+				-b 115200 \
+				-V
+
+all: $(ELF) $(TARGET)
+
+%.o : %.c
+	$(CC) -c $(CFLAGS) -o $*.o $<
+
+$(ELF): $(OBJ)
+	$(CC) $(LDFLAGS) $^ -o $@
+
+$(TARGET):
+	$(OBJCOPY) $(OBJCOPYARGS) $(ELF) $(TARGET)
+
+clean:
+	rm -f $(BINDIR)/* $(SRCDIR)/*.o
+
+install:
+	$(AVRDUDE) $(AVRDUDEARGS) -U flash:w:$(TARGET)
+
+format:
+	$(CODE_FORMATTER) $(SRC)
+
+.PHONY: clean install format