Simplify Makefile to exclude Arduino core libraries

- Binary file is now <700 bytes, from ~5500 bytes when using Arduino
libraries and core sources
- Time to flash to MCU is decreased from ~8s to ~0.75s
- Change target object name for better clarity

src/atmega/Makefile

@@ -3,86 +3,40 @@ PROJECT = vase-control
 MCU = atmega328p
 F_CPU = 16000000UL
 
-ARDUINO_INSTALL_PATH = /usr/share/arduino
-ARDUINO_CORE_PATH = $(ARDUINO_INSTALL_PATH)/hardware/arduino/avr/cores/arduino
-ARDUINO_VARIANT_PATH = $(ARDUINO_INSTALL_PATH)/hardware/arduino/avr/variants/standard
-
 CC = avr-gcc
-CXX = avr-g++
-LD = $(CXX)
+LD = $(CC)
 OC = avr-objcopy
-AR = avr-ar
 RM = rm -f
 
-AVRDUDE = avrdude
-AVRDUDE_FLAGS = -v -p m328p -c usbasp
-
 BUILD_DIR = build
 OBJ_DIR = $(BUILD_DIR)/obj
-CORE_DIR = $(BUILD_DIR)/core
-
-CFLAGS = -Wall -Os -DF_CPU=$(F_CPU) -mmcu=$(MCU) -I$(ARDUINO_CORE_PATH) -I$(ARDUINO_VARIANT_PATH) -I.
-CXXFLAGS = $(CFLAGS) -fno-exceptions -fpermissive -std=gnu++11
-
-LDFLAGS = -Wall -Os -mmcu=$(MCU) -Wl,--gc-sections
-LIBS = -lm
 
 SRCS_C = adc.c moisture.c main.c
-#SRCS_CPP = main.cpp
-HDRS = moisture.h config.h adc.h
-OBJS = $(addprefix $(OBJ_DIR)/, $(SRCS_CPP:.cpp=.o) $(SRCS_C:.c=.o))
+OBJS = $(addprefix $(OBJ_DIR)/, $(SRCS_C:.c=.o))
 
-CORE_C_SRCS = \
-	wiring.c \
-	wiring_analog.c \
-	wiring_digital.c \
-	hooks.c
+CFLAGS = -Wall -Os -DF_CPU=$(F_CPU) -mmcu=$(MCU) -I.
+LDFLAGS = -Wall -Os -mmcu=$(MCU)
+LIBS = -lm
 
-CORE_CPP_SRCS = \
-	abi.cpp \
-	new.cpp \
-	Print.cpp \
-	Stream.cpp \
-	HardwareSerial.cpp \
-	HardwareSerial0.cpp \
-
-CORE_SRCS = $(addprefix $(ARDUINO_CORE_PATH)/, $(CORE_C_SRCS) $(CORE_CPP_SRCS))
-CORE_OBJS = $(patsubst $(ARDUINO_CORE_PATH)/%.c,$(CORE_DIR)/%.o,$(filter %.c,$(CORE_SRCS))) \
-            $(patsubst $(ARDUINO_CORE_PATH)/%.cpp,$(CORE_DIR)/%.o,$(filter %.cpp,$(CORE_SRCS)))
-
-CORE_LIB = $(BUILD_DIR)/libcore.a
-
-EXEC = moisture
+EXEC = atmega
 ELF_TARGET = $(BUILD_DIR)/$(EXEC).elf
 TARGET = $(BUILD_DIR)/$(EXEC).hex
 
 all: $(TARGET)
 
-$(shell mkdir -p $(OBJ_DIR) $(CORE_DIR))
+$(shell mkdir -p $(OBJ_DIR))
 
-$(ELF_TARGET): $(OBJS) $(CORE_LIB)
-	$(LD) $(LDFLAGS) $(OBJS) -L$(BUILD_DIR) -lcore $(LIBS) -o $@
+$(ELF_TARGET): $(OBJS)
+	$(LD) $(LDFLAGS) $(OBJS) -o $@ $(LIBS)
 
-$(CORE_LIB): $(CORE_OBJS)
-	$(AR) rcs $@ $^
-
-$(OBJ_DIR)/%.o: %.c $(HDRS) Makefile
+$(OBJ_DIR)/%.o: %.c
 	$(CC) $(CFLAGS) -c $< -o $@
 
-$(OBJ_DIR)/%.o: %.cpp $(HDRS) Makefile
-	$(CXX) $(CXXFLAGS) -c $< -o $@
-
-$(CORE_DIR)/%.o: $(ARDUINO_CORE_PATH)/%.c Makefile
-	$(CC) $(CFLAGS) -c $< -o $@
-
-$(CORE_DIR)/%.o: $(ARDUINO_CORE_PATH)/%.cpp Makefile
-	$(CXX) $(CXXFLAGS) -c $< -o $@
-
 $(TARGET): $(ELF_TARGET)
 	$(OC) -O ihex -R .eeprom $< $@
 
 clean:
-	$(RM) $(TARGET) $(ELF_TARGET) $(OBJS) $(CORE_OBJS) $(CORE_LIB)
+	$(RM) $(TARGET) $(ELF_TARGET) $(OBJS)
 	$(RM) -r $(BUILD_DIR)
 
 .PHONY: all clean

src/atmega/build-atmega.sh

@@ -6,7 +6,7 @@ SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
 IMAGE_NAME="vase-control-builder"
 DOCKERFILE="$SCRIPT_DIR/Dockerfile"
 BUILD_CTX="$SCRIPT_DIR"
-DEST_HEX="$SCRIPT_DIR/build/moisture.hex"
+DEST_HEX="$SCRIPT_DIR/build/atmega.hex"
 MCU="atmega328p"; PRG="usbasp"; AVR_FLAGS="-B 10"
 
 docker build -t "$IMAGE_NAME" -f "$DOCKERFILE" "$BUILD_CTX"
@@ -14,7 +14,7 @@ docker build -t "$IMAGE_NAME" -f "$DOCKERFILE" "$BUILD_CTX"
 mkdir -p "$(dirname "$DEST_HEX")"
 
 docker run --rm "$IMAGE_NAME" \
-  cat /usr/src/build/moisture.hex > "$DEST_HEX"
+  cat /usr/src/build/atmega.hex > "$DEST_HEX"
 
 command -v avrdude >/dev/null || { echo "Install avrdude"; exit 1; }
-avrdude -v -p m328p -c usbasp -U flash:w:build/moisture.hex:i
+avrdude -v -p m328p -c usbasp -U flash:w:build/atmega.hex:i