add ability to flash bootloader and compile for maple mini

Makefile

@@ -12,8 +12,8 @@
 ## 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
+## the make file provide rule to compile and flash firmware for STM32F1 micro-controllers
+## it uses libopencm3 and STM32duino-bootloader
 
 # be silent per default, but 'make V=1' will show all compiler calls.
 ifneq ($(V),1)
@@ -24,6 +24,10 @@ endif
 # the final binary name (without extension)
 BINARY = firmware
 
+# which development board is used
+# supported are: SYSTEM_BOARD, MAPLE_MINI
+BOARD = MAPLE_MINI
+
 # source files
 LIBS = lib
 CSRC = $(wildcard *.c)
@@ -67,7 +71,11 @@ CFLAGS += -I. -I$(INCLUDE_DIR) $(patsubst %,-I%,$(LIBS))
 CFLAGS += $(DEFS)
 
 # linker script
+ifeq ($(BOARD),SYSTEM_BOARD)
 LDSCRIPT = stm32f103x8-dfu.ld
+else ifeq ($(BOARD),MAPLE_MINI)
+LDSCRIPT = stm32f103xb-dfu.ld
+endif
 
 # linker flags
 LDFLAGS += --static -nostartfiles
@@ -99,7 +107,11 @@ ACMPORT = /dev/ttyACM0
 
 # board specific USB DFU bootloader
 BOOTLOADERS = STM32duino-bootloader
+ifeq ($(BOARD),SYSTEM_BOARD)
 BOOTLOADER = $(BOOTLOADERS)/STM32F1/binaries/generic_boot20_pa1.bin
+else ifeq ($(BOARD),MAPLE_MINI)
+BOOTLOADER = $(BOOTLOADERS)/STM32F1/binaries/maple_mini_boot20.bin
+endif
 
 # verify if STM32duino-bootloader has been downloaded
 BOOTLOADER_EXISTS = $(shell [ -f $(BOOTLOADER) ] && echo 1 || echo 0 )
@@ -160,7 +172,7 @@ flash-swd: $(BINARY).hex
 
 # reset device by setting the data width to 5 bis on the USB CDC ACM port
 reset:
-	$(Q)stty --file /dev/ttyACM0 115200 raw cs5
+	$(Q)stty --file $(ACMPORT) 115200 raw cs5
 	$(Q)sleep 0.5
 	
 flash-dfu: $(BINARY).bin reset