CC      = arm-none-eabi-gcc
CPP     = arm-none-eabi-cpp
LD      = arm-none-eabi-gcc
AR      = arm-none-eabi-ar
OBJCOPY = arm-none-eabi-objcopy
NM      = arm-none-eabi-nm

LDSCRIPT = $(OBJECTDIR)/cc2538.ld

CFLAGS += -O2 -mcpu=cortex-m3 -mthumb -mlittle-endian
CFLAGS += -fshort-enums -fomit-frame-pointer -fno-strict-aliasing
CFLAGS += -Wall
LDFLAGS += -mcpu=cortex-m3 -mthumb -nostartfiles
LDFLAGS += -T $(LDSCRIPT)
LDFLAGS += -Wl,-Map=$(@:.elf=-$(TARGET).map),--cref,--no-warn-mismatch
OBJCOPY_FLAGS += -O binary --gap-fill 0xff

### Are we building with code size optimisations?
ifeq ($(SMALL),1)
  CFLAGS += -ffunction-sections -fdata-sections
  LDFLAGS += -Wl,--gc-sections
endif

### If the user-specified a Node ID, pass a define
ifdef NODEID
  CFLAGS += -DIEEE_ADDR_NODE_ID=$(NODEID)
endif

### CPU-dependent cleanup files
CLEAN += symbols.c symbols.h *.d *.elf

### CPU-dependent directories
CONTIKI_CPU_DIRS = . dev usb

### Use the existing debug I/O in cpu/arm/common
CONTIKI_CPU_DIRS += ../arm/common/dbg-io

### Use usb core from cpu/cc253x/usb/common
CONTIKI_CPU_DIRS += ../cc253x/usb/common ../cc253x/usb/common/cdc-acm

### CPU-dependent source files
CONTIKI_CPU_SOURCEFILES += clock.c rtimer-arch.c uart.c watchdog.c
CONTIKI_CPU_SOURCEFILES += nvic.c cpu.c sys-ctrl.c gpio.c ioc.c
CONTIKI_CPU_SOURCEFILES += cc2538-rf.c udma.c lpm.c
CONTIKI_CPU_SOURCEFILES += dbg.c ieee-addr.c
CONTIKI_CPU_SOURCEFILES += slip-arch.c slip.c

DEBUG_IO_SOURCEFILES += dbg-printf.c dbg-snprintf.c dbg-sprintf.c strformat.c

USB_CORE_SOURCEFILES += usb-core.c cdc-acm.c
USB_ARCH_SOURCEFILES += usb-arch.c usb-serial.c cdc-acm-descriptors.c

CONTIKI_SOURCEFILES += $(CONTIKI_CPU_SOURCEFILES) $(DEBUG_IO_SOURCEFILES)
CONTIKI_SOURCEFILES += $(USB_CORE_SOURCEFILES) $(USB_ARCH_SOURCEFILES)

### Don't treat the .elf as intermediate
.PRECIOUS: %.elf %.bin

### Always re-build ieee-addr.o in case the command line passes a new NODEID
FORCE:

$(OBJECTDIR)/ieee-addr.o: ieee-addr.c FORCE | $(OBJECTDIR)
	$(CC) $(CFLAGS) -c $< -o $@

### Compilation rules
CUSTOM_RULE_LINK=1

%.elf: $(TARGET_STARTFILES) %.co $(PROJECT_OBJECTFILES) $(PROJECT_LIBRARIES) contiki-$(TARGET).a $(LDSCRIPT)
	$(LD) $(LDFLAGS) ${filter-out $(LDSCRIPT) %.a,$^} ${filter %.a,$^} -o $@

%.bin: %.elf
	$(OBJCOPY) $(OBJCOPY_FLAGS) $< $@

### We don't really need the .bin for the .$(TARGET) but let's make sure it
### gets built
%.$(TARGET): %.elf %.bin
	cp $< $@

### This rule is used to generate the correct linker script
LDGENFLAGS += $(addprefix -D,$(subst $(COMMA), ,$(DEFINES)))
LDGENFLAGS += $(addprefix -I,$(SOURCEDIRS))
LDGENFLAGS += -imacros "contiki-conf.h"
LDGENFLAGS += -P -E

# NB: Assumes LDSCRIPT was not overridden and is in $(OBJECTDIR)
$(LDSCRIPT): $(CONTIKI_CPU)/cc2538.lds FORCE | $(OBJECTDIR)
	$(CPP) $(LDGENFLAGS) $< -o $@