diff --git a/Makefile b/Makefile
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+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library 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 Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+## this file is based on Makefile from libopencm3 examples
+## available at https://github.com/libopencm3/libopencm3-examples
+
+# be silent per default, but 'make V=1' will show all compiler calls.
+ifneq ($(V),1)
+Q := @
+endif
+
+# the final binary name (without extension)
+BINARY = main
+
+# source files
+OBJS += $(BINARY).o
+
+# executables
+PREFIX ?= arm-none-eabi
+CC := $(PREFIX)-gcc
+CXX := $(PREFIX)-g++
+LD := $(PREFIX)-gcc
+AR := $(PREFIX)-ar
+AS := $(PREFIX)-as
+OBJCOPY := $(PREFIX)-objcopy
+OBJDUMP := $(PREFIX)-objdump
+GDB := $(PREFIX)-gdb
+
+# opencm3 libraries
+OPENCM3_DIR := libopencm3
+INCLUDE_DIR = $(OPENCM3_DIR)/include
+LIB_DIR = $(OPENCM3_DIR)/lib
+SCRIPT_DIR = $(OPENCM3_DIR)/scripts
+
+# verify if libopencm3 has been downloaded
+OPENCM3_DIR_EXISTS = $(shell [ -d $(OPENCM3_DIR) ] && echo 1 || echo 0 )
+ifeq ($(OPENCM3_DIR_EXISTS), 0)
+$(info run "git submodule init" and "git submodule update" before runnig make)
+$(error libopencm3 repository is not initialized)
+endif
+
+# device flag
+DEFS += -DSTM32F1
+
+# C flags
+CFLAGS += -Os -g
+CFLAGS += -Wall -Wundef -Wextra -Wshadow -Wimplicit-function-declaration
+CFLAGS += -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes
+CFLAGS += -fno-common -ffunction-sections -fdata-sections
+CFLAGS += -MD
+CFLAGS += -I$(INCLUDE_DIR) $(DEFS)
+
+# linker script
+LDSCRIPT = stm32f103x8-dfu.ld
+
+# linker flags
+LDFLAGS += --static -nostartfiles
+LDFLAGS += -L$(LIB_DIR)
+LDFLAGS += -T$(LDSCRIPT)
+LDFLAGS += -Wl,-Map=$(*).map
+LDFLAGS += -Wl,--gc-sections
+ifeq ($(V),99)
+LDFLAGS += -Wl,--print-gc-sections
+endif
+
+# used libraries
+LIBNAME = opencm3_stm32f1
+LDLIBS += -l$(LIBNAME)
+LDLIBS += -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
+
+# device specific flags
+FP_FLAGS ?= -msoft-float
+ARCH_FLAGS = -mthumb -mcpu=cortex-m3 $(FP_FLAGS) -mfix-cortex-m3-ldrd
+
+# OpenOCD configuration
+OOCD ?= openocd
+OOCD_INTERFACE ?= stlink-v2
+OOCD_TARGET ?= stm32f1x
+
+# board specific USB DFU bootloader
+BOOTLOADERS = STM32duino-bootloader
+BOOTLOADER = $(BOOTLOADERS)/STM32F1/binaries/generic_boot20_pa1.bin
+
+# verify if STM32duino-bootloader has been downloaded
+BOOTLOADER_EXISTS = $(shell [ -f $(BOOTLOADER) ] && echo 1 || echo 0 )
+ifeq ($(BOOTLOADER_EXISTS), 0)
+$(info run "git submodule init" and "git submodule update" before runnig make)
+$(error STM32duino-bootloader repository is not initialized)
+endif
+
+# compile target rules
+all: elf
+
+elf: $(BINARY).elf
+bin: $(BINARY).bin
+hex: $(BINARY).hex
+srec: $(BINARY).srec
+list: $(BINARY).list
+
+%.bin: %.elf
+	$(Q)$(OBJCOPY) -Obinary $(<) $(@)
+
+%.hex: %.elf
+	$(Q)$(OBJCOPY) -Oihex $(<) $(@)
+
+%.srec: %.elf
+	$(Q)$(OBJCOPY) -Osrec $(<) $(@)
+
+%.list: %.elf
+	$(Q)$(OBJDUMP) -S $(<) > $(@)
+
+%.map: %.elf
+	@# it's generated along with the elf
+
+%.elf: $(OBJS) $(LDSCRIPT) $(LIB_DIR)/lib$(LIBNAME).a
+	$(info compiling $(@))
+	$(Q)$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJS) $(LDLIBS) -o $(@)
+
+%.o: %.c
+	@#printf "  CC      $(*).c\n"
+	$(Q)$(CC) $(CFLAGS) $(ARCH_FLAGS) -o $(@) -c $(<)
+
+clean:
+	$(Q)$(RM) *.o *.d *.elf *.bin *.hex *.srec *.list *.map
+
+# make libopencm3 if not done
+$(LIB_DIR)/lib$(LIBNAME).a:
+	$(info compiling libopencm3 library)
+	$(Q)$(MAKE) -C $(OPENCM3_DIR)
+
+bootloader: $(BOOTLOADER)
+	$(info flashing USB DFU bootloader $(<))
+	$(Q)$(OOCD) --file interface/$(OOCD_INTERFACE).cfg --file target/$(OOCD_TARGET).cfg --command "init" --command "reset init" --command "flash write_image erase $(<) 0x08000000" --command "reset" --command "shutdown" 2> /dev/null
+
+flash: flash-swd
+
+flash-swd: $(BINARY).hex
+	$(info flashing $(<) using SWD)
+	$(Q)$(OOCD) --file interface/$(OOCD_INTERFACE).cfg --file target/$(OOCD_TARGET).cfg --command "init" --command "reset init" --command "flash write_image erase $(<)" --command "reset" --command "shutdown" 2> /dev/null
+
+flash-dfu: $(BINARY).bin
+	$(info flashing $(<) using DFU)
+	$(Q)dfu-util --device 1eaf:0003 --cfg 1 --intf 0 --alt 2 --reset --download $(<)
+
+.PHONY: clean elf bin hex srec list bootloader flash flash-swd flash-dfu
+
+-include $(OBJS:.o=.d)