Initial commit

Makefile

@@ -0,0 +1,143 @@
+.DELETE_ON_ERROR:
+.SUFFIXES:
+
+# Makefile                                                                      
+# Written by Leon Krieg <info@madcow.dev>
+
+# ==============================================================================
+# GENERAL SETTINGS
+# ==============================================================================
+
+VERBOSE   := false
+ARCH      := m1284
+MCU       := atmega1284p
+FREQ      := 8000000UL
+ISP       := usbasp
+CC        := avr-gcc
+LD        := $(CC)
+OBJCOPY   := avr-objcopy
+AVD       := avrdude
+SIM       := simavr
+MKDIR     := mkdir -p
+RMR       := rm -rf
+GIT       := git
+
+LFUSE     := 0xC2
+HFUSE     := 0xD7
+EFUSE     := 0xFF
+LOCK      := 0xFF
+
+SRCDIR    := src
+BINDIR    := bin
+TMPDIR    := $(BINDIR)/build
+TARGET    := $(BINDIR)/core.hex
+ELFFILE   := $(BINDIR)/core.elf
+LOGFILE   := $(BINDIR)/core.log
+
+CPPFLAGS  := -DF_CPU=$(FREQ) -I$(SRCDIR)
+CFLAGS    := -mmcu=$(MCU) -Os -std=c99 -Wall -Wextra -Werror
+OCFLAGS   := -j .text -j .data -O ihex
+LDFLAGS   := -mmcu=$(MCU) -Wl,-u,vfprintf -lprintf_flt
+LDLIBS    := -lm
+
+# ==============================================================================
+# TARGET FILE LISTS (DERIVED FROM SOURCE TREE)
+# ==============================================================================
+
+PATHS     := $(shell find "$(SRCDIR)" -type d -printf '%P ' 2>/dev/null)
+FILES     := $(shell find "$(SRCDIR)" -type f -name "*.c" -printf '%P ' 2>/dev/null)
+TMPDIRS   := $(BINDIR) $(TMPDIR) $(PATHS:%=$(TMPDIR)/%)
+OBJECTS   := $(FILES:%.c=$(TMPDIR)/%.o)
+DEPENDS   := $(FILES:%.c=$(TMPDIR)/%.d)
+
+# ==============================================================================
+# AUXILIARY TARGETS
+# ==============================================================================
+
+.PHONY: all
+all: flash
+
+.PHONY: flash
+flash: $(TARGET)
+	$(E) "[AVD] Flashing..."
+	$(Q) $(AVD)                   \
+	       -l$(LOGFILE) -B375kHz  \
+	       -c $(ISP) -p $(ARCH)   \
+	       -U lfuse:w:$(LFUSE):m  \
+	       -U hfuse:w:$(HFUSE):m  \
+	       -U efuse:w:$(EFUSE):m  \
+	       -U lock:w:$(LOCK):m    \
+	       -U flash:w:$<
+
+.PHONY: simulate
+simulate: $(TARGET)
+	$(E) "[SIM] $<"
+	$(Q) $(SIM) -m $(MCU) -f $(FREQ) $<
+
+.PHONY: clean
+clean:
+	$(E) "[REM] $(TARGET)"
+	$(Q) $(RMR) $(TARGET)
+	$(E) "[REM] $(ELFFILE)"
+	$(Q) $(RMR) $(ELFFILE)
+	$(E) "[REM] $(LOGFILE)"
+	$(Q) $(RMR) $(LOGFILE)
+	$(E) "[REM] $(TMPDIR)"
+	$(Q) $(RMR) $(TMPDIR)
+
+.PHONY: distclean
+distclean: clean
+	$(E) "[REM] $(BINDIR)"
+	$(Q) $(RMR) $(BINDIR)
+
+$(TMPDIRS):
+	$(E) "[DIR] $@"
+	$(Q) $(MKDIR) $@
+
+# ==============================================================================
+# PRIMARY BUILD TARGET AND PATTERN RULES
+# ==============================================================================
+
+# We must expand the prerequisite lists a second time to resolve path variable
+# $(@D). This means folders can be set as explicit dependencies and created in
+# the $TMPDIRS rule. This is better than relying on Make to honor the order of
+# prerequisites for the primary target and we will not have to call mkdir for
+# each build step preemptively.
+
+.SECONDEXPANSION:
+
+$(TARGET): $(ELFFILE) | $$(@D)
+	$(E) "[HEX] $@"
+	$(Q) $(OBJCOPY) $(OCFLAGS) $< $@
+
+$(ELFFILE): $(OBJECTS) $(DEPENDS) | $$(@D)
+	$(E) "[ELF] $@"
+	$(Q) $(LD) -o $@ $(LDFLAGS) $(OBJECTS) $(LDLIBS)
+
+$(TMPDIR)/%.o: $(SRCDIR)/%.c | $$(@D)
+	$(E) "[OBJ] $@"
+	$(Q) $(CC) -c -o $@ $(CFLAGS) $(CPPFLAGS) $<
+
+$(TMPDIR)/%.d: $(SRCDIR)/%.c | $$(@D)
+	$(E) "[DEP] $@"
+	$(Q) $(CC) -c -o $@ $(CFLAGS) $(CPPFLAGS) -MM -MT $(@:.d=.o) $<
+
+# ==============================================================================
+# MAKE PREPROCESSOR INCLUDES AND CONDITIONALS
+# ==============================================================================
+
+# Load header dependency rules
+include $(wildcard $(DEPENDS))
+
+# Sanity check
+ifeq ($(strip $(OBJECTS)),)
+$(error No sources found in '$(SRCDIR)/')
+endif
+
+# Handle verbosity setting
+ifneq ($(VERBOSE), false)
+E = @true
+else
+E = @echo
+Q = @
+endif