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+
+ifneq ($(findstring STM32F303, $(MCU)),)
+ ## chip/board settings
+ # - the next two should match the directories in
+ # <chibios>/os/hal/ports/$(MCU_FAMILY)/$(MCU_SERIES)
+ MCU_FAMILY ?= STM32
+ MCU_SERIES ?= STM32F3xx
+
+ # Linker script to use
+ # - it should exist either in <chibios>/os/common/ports/ARMCMx/compilers/GCC/ld/
+ # or <this_dir>/ld/
+ MCU_LDSCRIPT ?= STM32F303xC
+
+ # Startup code to use
+ # - it should exist in <chibios>/os/common/startup/ARMCMx/compilers/GCC/mk/
+ MCU_STARTUP ?= stm32f3xx
+
+ # Board: it should exist either in <chibios>/os/hal/boards/
+ # or <this_dir>/boards
+ BOARD ?= GENERIC_STM32_F303XC
+
+ # Cortex version
+ MCU = cortex-m4
+
+ # ARM version, CORTEX-M0/M1 are 6, CORTEX-M3/M4/M7 are 7
+ ARMV ?= 7
+
+ USE_FPU = yes
+
+ # Vector table for application
+ # 0x00000000-0x00001000 area is occupied by bootlaoder.*/
+ # The CORTEX_VTOR... is needed only for MCHCK/Infinity KB
+ # OPT_DEFS = -DCORTEX_VTOR_INIT=0x08005000
+
+ # Options to pass to dfu-util when flashing
+ DFU_ARGS ?= -d 0483:df11 -a 0 -s 0x08000000:leave
+endif
+
+ifneq (,$(filter $(MCU),atmega32u4 at90usb1286))
+ # Processor frequency.
+ # This will define a symbol, F_CPU, in all source code files equal to the
+ # processor frequency in Hz. You can then use this symbol in your source code to
+ # calculate timings. Do NOT tack on a 'UL' at the end, this will be done
+ # automatically to create a 32-bit value in your source code.
+ #
+ # This will be an integer division of F_USB below, as it is sourced by
+ # F_USB after it has run through any CPU prescalers. Note that this value
+ # does not *change* the processor frequency - it should merely be updated to
+ # reflect the processor speed set externally so that the code can use accurate
+ # software delays.
+ F_CPU ?= 16000000
+
+ # LUFA specific
+ #
+ # Target architecture (see library "Board Types" documentation).
+ ARCH ?= AVR8
+
+ # Input clock frequency.
+ # This will define a symbol, F_USB, in all source code files equal to the
+ # input clock frequency (before any prescaling is performed) in Hz. This value may
+ # differ from F_CPU if prescaling is used on the latter, and is required as the
+ # raw input clock is fed directly to the PLL sections of the AVR for high speed
+ # clock generation for the USB and other AVR subsections. Do NOT tack on a 'UL'
+ # at the end, this will be done automatically to create a 32-bit value in your
+ # source code.
+ #
+ # If no clock division is performed on the input clock inside the AVR (via the
+ # CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
+ F_USB ?= $(F_CPU)
+endif