Makefile-ARM

##############################################################################
#                                                                            #
# Teacup - Lean and efficient firmware for RepRap printers                   #
#                                                                            #
# by Triffid Hunter, Traumflug, jakepoz, many others.                        #
#                                                                            #
# This firmware is Copyright (c) ...                                         #
#   2009 - 2010 Michael Moon aka Triffid_Hunter                              #
#   2010 - 2013 Markus "Traumflug" Hitter <mah@jump-ing.de>                  #
#                                                                            #
# This program is free software; you can redistribute it and/or modify       #
# it under the terms of the GNU General Public License as published by       #
# the Free Software Foundation; either version 2 of the License, or          #
# (at your option) any later version.                                        #
#                                                                            #
# This program is distributed in the hope that it will be useful,            #
# but WITHOUT ANY WARRANTY; without even the implied warranty of             #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              #
# GNU General Public License for more details.                               #
#                                                                            #
# You should have received a copy of the GNU General Public License          #
# along with this program; if not, write to the Free Software                #
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA #
#                                                                            #
##############################################################################

##############################################################################
#                                                                            #
# Makefile for ARM targets. Use it with                                      #
#                                                                            #
#   make -f Makefile-ARM                                                     #
#                                                                            #
# or copy/link it to Makefile for convenience.                               #
#                                                                            #
##############################################################################

##############################################################################
#                                                                            #
# Change these to suit your hardware                                         #
#                                                                            #
##############################################################################

MCU ?= lpc1114
# MCU ?= stm32f411
# MCU ?= stm32f446

# some size parameters. Not important for flashing and compiling.
ifeq ($(MCU), lpc1114)
  FLASH_SIZE = 32
  RAM_SIZE = 4
else ifeq ($(MCU), stm32f411)
  FLASH_SIZE = 512
  RAM_SIZE = 128
else ifeq ($(MCU), stm32f446)
  FLASH_SIZE = 512
  RAM_SIZE = 128
endif

# CPU clock rate not defined here, but in the CMSIS headers.

##############################################################################
#                                                                            #
# Where to find your compiler and linker. Later, this is completed like      #
#   CC = $(TOOLCHAIN)gcc                                                     #
#                                                                            #
##############################################################################

TOOLCHAIN = arm-none-eabi-
# TOOLCHAIN = <path-to-arduino-folder>/hardware/tools/gcc-arm-none-eabi-4.8.3-2014q1/bin/arm-none-eabi-

##############################################################################
#                                                                            #
# Programmer settings for "make program"                                     #
#                                                                            #
##############################################################################

# Unlike with AVR, there is no one tool for uploading to all chips. Some
# need 'lpc21isp', others (e.g. Arduinos) need 'bossac'.
#
# To deal with this, we simply define the port here and do the rest directly
# in the rules for the 'program' target.

# Frequency of the on-chip R/C oscillator or the on-board quartz crystal.
# Not to confuse with the CPU's clock frequency, which is usually much higher.
F_CRYSTAL ?= 12000000

# This is your uploader with any option before your uploadfile $<
# and your uploadfile (hex, bin or whatelse)
ifeq ($(MCU), lpc1114)
  UPLOADER ?= lpc21isp -control
  UPLOAD_FILE = $(PROGRAM).hex
else ifeq ($(findstring stm32, $(MCU)), stm32)
  UPLOADER ?= st-flash --reset write
  UPLOAD_FILE = $(BUILDDIR)/$(PROGRAM).bin
endif

ifeq ($(MCU), lpc1114)
  UPLOADER_FLAGS = $(UPLOADER_PORT)
  UPLOADER_FLAGS += 115200
  UPLOADER_FLAGS += $(F_CRYSTAL)
else ifeq ($(findstring stm32, $(MCU)), stm32)
  UPLOADER_FLAGS = 0x8000000
endif

# Serial port the electronics is connected to.
#UPLOADER_PORT ?= /dev/ttyUSB0
UPLOADER_PORT ?= /dev/ttyACM0
#UPLOADER_PORT ?= com1

##############################################################################
#                                                                            #
# Below here, defaults should be ok.                                         #
#                                                                            #
##############################################################################

PROGRAM = teacup

# The thing we build by default, and also the thing we clean.
TARGET = $(PROGRAM).hex

# Arduino IDE takes the "compile everything available"-approach, so we have
# to keep this working and can take a shortcut:
SOURCES = $(wildcard *.c)

# Other target MCU specific adjustments:
ifeq ($(MCU), lpc1114)
  STARTUP_FILE = cmsis-startup_lpc11xx.S
else ifeq ($(findstring stm32, $(MCU)), stm32)
  STARTUP_FILE = cmsis-startup_stm32f4xx.S
endif

# Link time optimization is on by default
ifeq ($(USE_FLTO),)
  USE_FLTO=yes
endif
# Startup definitions. Not target MCU specific.
CFLAGS  = -D__STARTUP_CLEAR_BSS -D__START=main
ifeq ($(MCU), lpc1114)
  CFLAGS += -mthumb -mcpu=cortex-m0
  CFLAGS += -mtune=cortex-m0
  CFLAGS += -D__ARM_LPC1114__
else ifeq ($(findstring stm32, $(MCU)), stm32)
  CFLAGS += -mthumb -mcpu=cortex-m4
  CFLAGS += -mtune=cortex-m4
  CFLAGS += -D__ARM_STM32__
  CFLAGS += -mfpu=fpv4-sp-d16
  CFLAGS += -mfloat-abi=hard
  CFLAGS += -mlittle-endian
  CFLAGS += -D__FPU_PRESENT=1
  CFLAGS += -fomit-frame-pointer
  CFLAGS += -nostartfiles
endif
ifeq ($(MCU), stm32f411)
  CFLAGS += -DSTM32F411xE
  CFLAGS += -D__SYSTEM_CLOCK=100000000
else ifeq ($(MCU), stm32f446)
  CFLAGS += -DSTM32F446xx
  CFLAGS += -D__SYSTEM_CLOCK=180000000
endif
# Other options ...
CFLAGS += -Wall
CFLAGS += -Wstrict-prototypes
CFLAGS += -Os
ifeq ($(USE_FLTO),yes)
  CFLAGS += -flto
endif
CFLAGS += -ffunction-sections
CFLAGS += -fdata-sections
#CFLAGS += -dM -E # To list all predefined macros into the .o file.

LDFLAGS  = --specs=nano.specs
LDFLAGS += --specs=nosys.specs
ifeq ($(MCU), lpc1114)
  LDFLAGS += -T cmsis-lpc1114.ld
else ifeq ($(findstring stm32, $(MCU)), stm32)
  LDFLAGS += -T cmsis-stm32f4xx.ld
endif
LDFLAGS += -Wl,--as-needed
LDFLAGS += -Wl,--gc-sections

LIBS  = -lm

-include Makefile-common

# Architecture specific targets

.PHONY: all program size

all: $(PROGRAM).hex $(BUILDDIR)/$(PROGRAM).lst $(BUILDDIR)/$(PROGRAM).sym size

ifeq ($(MCU), lpc1114)
define upload_echo
	@echo
	@echo "To let the bootloader complete his work, connect now PIO0_1 to GND,"
	@echo "then press Reset for a moment. The bootloader should begin uploading."
	@echo "After being done, disconnect PIO0_1 and press reset again. On a"
	@echo "Gen7-ARM, PIO0_1 is the Step pin of the Z stepper driver."
	@echo
endef
else ifeq ($(findstring stm32, $(MCU)), stm32)
define upload_echo
	@echo
	@echo "Starting upload..."
	@echo
endef
endif

program: $(UPLOAD_FILE) config.h
	$(call upload_echo)
	$(UPLOADER) $< $(UPLOADER_FLAGS)

$(BUILDDIR)/teacup.elf: $(BUILDDIR)/startup.o $(OBJ)
	@echo "  LINK      $@"
	@$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)

$(BUILDDIR)/startup.o: $(STARTUP_FILE) | $(BUILDDIR)
	@echo "  CC        $@"
	@$(CC) -c $(CFLAGS) -o $@ $<

## Interpret TARGET section sizes wrt different ARM chips
## Usage:  $(call show_size,section-name,section-regex,lpc1114-size-in-k)
define show_size
	@$(OBJDUMP) -h $^ | \
		perl -MPOSIX -ne \
		'/.($2)\s+([0-9a-f]+)/ && do { $$a += eval "0x$$2" }; \
		END { printf "    %-7s: %5d bytes         %3d%%\n", "$1", $$a, \
			ceil($$a * 100 / ($3 * 1024)), \
		}'
endef

size: $(BUILDDIR)/$(PROGRAM).elf
	@echo "    SIZES          ARM...     $(MCU)"
	$(call show_size,FLASH,text,$(FLASH_SIZE))
	$(call show_size,RAM,data|bss,$(RAM_SIZE))
	$(call show_size,EEPROM,eeprom,0.0001)