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rules.mk
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rules.mk
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# 'make V=1' will show all compiler calls.
V ?= 0
ifeq ($(V),0)
Q := @
NULL := 2>/dev/null
endif
PREFIX ?= $(ARM_TOOCHAIN)/arm-none-eabi-
CC = $(PREFIX)gcc
AS = $(PREFIX)as
LD = $(PREFIX)ld
OBJCOPY = $(PREFIX)objcopy
# `$(shell pwd)` or `.`, both works
TOP = $(shell pwd)
BDIR = $(TOP)/$(BUILD_DIR)
# For each direcotry, add it to csources
CSOURCES := $(foreach dir, $(CDIRS), $(shell find $(TOP)/$(dir) -maxdepth 1 -name '*.c'))
# Add single c source files to csources
CSOURCES += $(addprefix $(TOP)/, $(CFILES))
# Then assembly source folders and files
ASOURCES := $(foreach dir, $(ADIRS), $(shell find $(TOP)/$(dir) -maxdepth 1 -name '*.s'))
ASOURCES += $(addprefix $(TOP)/, $(AFILES))
# Fill object files with c and asm files (keep source directory structure)
OBJS = $(CSOURCES:$(TOP)/%.c=$(BDIR)/%.o)
OBJS += $(ASOURCES:$(TOP)/%.s=$(BDIR)/%.o)
# d files for detecting h file changes
DEPS=$(CSOURCES:$(TOP)/%.c=$(BDIR)/%.d)
# Arch and target specified flags
ARCH_FLAGS := -mthumb -mcpu=cortex-m4
# Debug options, -gdwarf-2 for debug, -g0 for release
# https://gcc.gnu.org/onlinedocs/gcc-12.2.0/gcc/Debugging-Options.html
# -g: system’s native format, -g0:off, -g/g1,-g2,-g3 -> more verbosely
# -ggdb: for gdb, -ggdb0:off, -ggdb/ggdb1,-ggdb2,-ggdb3 -> more verbosely
# -gdwarf: in DWARF format, -gdwarf-2,-gdwarf-3,-gdwarf-4,-gdwarf-5
DEBUG_FLAGS ?= -gdwarf-3
# c flags
OPT ?= -O0
CSTD ?= -std=c99
TGT_CFLAGS += $(ARCH_FLAGS) $(DEBUG_FLAGS) $(OPT) $(CSTD) $(addprefix -D, $(LIB_FLAGS)) -Wall -ffunction-sections -fdata-sections
# asm flags
TGT_ASFLAGS += $(ARCH_FLAGS) $(DEBUG_FLAGS) $(OPT) -Wa,--warn
# ld flags
TGT_LDFLAGS += $(ARCH_FLAGS) -specs=nano.specs -specs=nosys.specs -static -lc -lm \
-Wl,-Map=$(BDIR)/$(PROJECT).map \
-Wl,--gc-sections \
-Wl,--print-memory-usage \
-Wl,--no-warn-rwx-segments
ifeq ($(ENABLE_PRINTF_FLOAT),y)
TGT_LDFLAGS += -u _printf_float
endif
# include paths
TGT_INCFLAGS := $(addprefix -I $(TOP)/, $(INCLUDES))
.PHONY: all clean flash echo
all: $(BDIR)/$(PROJECT).elf $(BDIR)/$(PROJECT).bin $(BDIR)/$(PROJECT).hex
# for debug
echo:
$(info 1. $(AFILES))
$(info 2. $(ASOURCES))
$(info 3. $(CSOURCES))
$(info 4. $(OBJS))
$(info 5. $(TGT_INCFLAGS))
# include d files without non-exist warning
-include $(DEPS)
# Compile c to obj -- should be `$(BDIR)/%.o: $(TOP)/%.c`, but since $(TOP) is base folder so non-path also works
$(BDIR)/%.o: %.c
@printf " CC\t$<\n"
@mkdir -p $(dir $@)
$(Q)$(CC) $(TGT_CFLAGS) $(TGT_INCFLAGS) -o $@ -c $< -MD -MF $(BDIR)/$*.d -MP
$(BDIR)/%.o: %.s
@printf " AS\t$<\n"
@mkdir -p $(dir $@)
$(Q)$(CC) $(TGT_ASFLAGS) -o $@ -c $<
$(BDIR)/$(PROJECT).elf: $(OBJS) $(TOP)/$(LDSCRIPT)
@printf " LD\t$@\n"
$(Q)$(CC) $(TGT_LDFLAGS) -T$(TOP)/$(LDSCRIPT) $(OBJS) -o $@
%.bin: %.elf
@printf " OBJCP\t$@\n"
$(Q)$(OBJCOPY) -O binary $< $@
%.hex: %.elf
@printf " OBJCP\t$@\n"
$(Q)$(OBJCOPY) -O ihex $< $@
clean:
rm -rf $(BDIR)/*
flash:
ifeq ($(FLASH_PROGRM),jlink)
$(JLINKEXE) -device $(JLINK_DEVICE) -if swd -speed 4000 -CommanderScript $(TOP)/Misc/flash.jlink
else ifeq ($(FLASH_PROGRM),pyocd)
$(PYOCD_EXE) erase -c -t $(PYOCD_DEVICE) --config $(TOP)/Misc/pyocd.yaml
$(PYOCD_EXE) load $(BDIR)/$(PROJECT).hex -t $(PYOCD_DEVICE) --config $(TOP)/Misc/pyocd.yaml
else
@echo "FLASH_PROGRM is invalid\n"
endif