diff --git a/.idea/cmake.xml b/.idea/cmake.xml
index 4d9fc9aa5..52b698227 100644
--- a/.idea/cmake.xml
+++ b/.idea/cmake.xml
@@ -2,6 +2,8 @@
+
+
@@ -22,8 +24,8 @@
-
-
+
+
\ No newline at end of file
diff --git a/examples/cmake/cpu/cortex-m4.cmake b/examples/cmake/cpu/cortex-m4.cmake
new file mode 100644
index 000000000..5a2d16c05
--- /dev/null
+++ b/examples/cmake/cpu/cortex-m4.cmake
@@ -0,0 +1,12 @@
+if (TOOLCHAIN STREQUAL "gcc")
+ list(APPEND TOOLCHAIN_COMMON_FLAGS
+ -mthumb
+ -mcpu=cortex-m4
+ -mfloat-abi=hard
+ -mfpu=fpv4-sp-d16
+ )
+
+ set(FREERTOS_PORT GCC_ARM_CM4F CACHE INTERNAL "")
+else ()
+ # TODO support IAR
+endif ()
diff --git a/examples/rules.mk b/examples/rules.mk
index 516beca78..2eaa48e2e 100644
--- a/examples/rules.mk
+++ b/examples/rules.mk
@@ -86,7 +86,7 @@ LDFLAGS += -Wl,-T,$(TOP)/$(GCC_LD_FILE)
endif
ifneq ($(SKIP_NANOLIB), 1)
-LDFLAGS += -specs=nosys.specs -specs=nano.specs
+LDFLAGS += --specs=nosys.specs --specs=nano.specs
endif
ASFLAGS += $(CFLAGS)
diff --git a/hw/bsp/lpc55/family.cmake b/hw/bsp/lpc55/family.cmake
index 729454b5e..0ac2b6ce3 100644
--- a/hw/bsp/lpc55/family.cmake
+++ b/hw/bsp/lpc55/family.cmake
@@ -1,8 +1,8 @@
-if (TARGET _${FAMILY}_family_inclusion_marker)
+if (TARGET _lpc55_family_inclusion_marker)
return()
endif ()
-add_library(_${FAMILY}_family_inclusion_marker INTERFACE)
+add_library(_lpc55_family_inclusion_marker INTERFACE)
if (NOT BOARD)
message(FATAL_ERROR "BOARD not specified")
diff --git a/hw/bsp/nrf/boards/pca10056/board.cmake b/hw/bsp/nrf/boards/pca10056/board.cmake
new file mode 100644
index 000000000..cc8ef2fcb
--- /dev/null
+++ b/hw/bsp/nrf/boards/pca10056/board.cmake
@@ -0,0 +1,8 @@
+set(MCU_VARIANT nrf52840)
+set(LD_FILE_gcc ${NRFX_DIR}/mdk/nrf52840_xxaa.ld)
+
+function(update_board TARGET)
+ target_compile_definitions(${TARGET} PUBLIC
+ NRF52840_XXAA
+ )
+endfunction()
diff --git a/hw/bsp/nrf/family.cmake b/hw/bsp/nrf/family.cmake
new file mode 100644
index 000000000..7adee5a03
--- /dev/null
+++ b/hw/bsp/nrf/family.cmake
@@ -0,0 +1,176 @@
+if (TARGET _nrf_family_inclusion_marker)
+ return()
+endif ()
+
+add_library(_nrf_family_inclusion_marker INTERFACE)
+
+if (NOT BOARD)
+ message(FATAL_ERROR "BOARD not specified")
+endif ()
+
+# toolchain set up
+set(CMAKE_SYSTEM_PROCESSOR cortex-m4 CACHE INTERNAL "System Processor")
+set(CMAKE_TOOLCHAIN_FILE ${CMAKE_CURRENT_LIST_DIR}/../../../examples/cmake/toolchain/arm_${TOOLCHAIN}.cmake)
+
+set(FAMILY_MCUS NRF5X CACHE INTERNAL "")
+
+# TOP is path to root directory
+set(TOP "${CMAKE_CURRENT_LIST_DIR}/../../..")
+set(NRFX_DIR ${TOP}/hw/mcu/nordic/nrfx)
+set(CMSIS_DIR ${TOP}/lib/CMSIS_5)
+
+# include board specific
+include(${CMAKE_CURRENT_LIST_DIR}/boards/${BOARD}/board.cmake)
+set(JLINK_DEVICE $(MCU_VARIANT)_xxaa)
+
+#------------------------------------
+# BOARD_TARGET
+#------------------------------------
+# only need to be built ONCE for all examples
+set(BOARD_TARGET board_${BOARD})
+if (NOT TARGET ${BOARD_TARGET})
+ add_library(${BOARD_TARGET} STATIC
+ # driver
+ ${NRFX_DIR}/drivers/src/nrfx_power.c
+ ${NRFX_DIR}/drivers/src/nrfx_uarte.c
+ # mcu
+ ${NRFX_DIR}/mdk/system_${MCU_VARIANT}.c
+ )
+ target_compile_definitions(${BOARD_TARGET} PUBLIC
+ CONFIG_GPIO_AS_PINRESET
+ )
+ target_include_directories(${BOARD_TARGET} PUBLIC
+ ${NRFX_DIR}/../ # hw/mcu/nordic: remove later
+ # driver
+ ${NRFX_DIR}
+ ${NRFX_DIR}/mdk
+ ${NRFX_DIR}/hal
+ ${NRFX_DIR}/drivers/include
+ ${NRFX_DIR}/drivers/src
+ ${CMSIS_DIR}/CMSIS/Core/Include
+ )
+ update_board(${BOARD_TARGET})
+
+ if (NOT DEFINED LD_FILE_${TOOLCHAIN})
+ set(LD_FILE_gcc ${NRFX_DIR}/mdk/${MCU_VARIANT}_xxaa.ld)
+ endif ()
+
+ if (TOOLCHAIN STREQUAL "gcc")
+ target_sources(${BOARD_TARGET} PUBLIC
+ ${NRFX_DIR}/mdk/gcc_startup_${MCU_VARIANT}.S
+ )
+ target_link_options(${BOARD_TARGET} PUBLIC
+ # linker file
+ "LINKER:--script=${LD_FILE_gcc}"
+ -L${NRFX_DIR}/mdk
+ # link map
+ "LINKER:-Map=$>,$,$>${CMAKE_EXECUTABLE_SUFFIX}.map"
+ # nanolib
+ --specs=nosys.specs
+ --specs=nano.specs
+ )
+ else ()
+ # TODO support IAR
+ endif ()
+endif () # BOARD_TARGET
+
+#------------------------------------
+# Functions
+#------------------------------------
+function(family_configure_target TARGET)
+ # set output name to .elf
+ set_target_properties(${TARGET} PROPERTIES OUTPUT_NAME ${TARGET}.elf)
+
+ # TOP is path to root directory
+ set(TOP "${CMAKE_CURRENT_FUNCTION_LIST_DIR}/../../..")
+
+ #---------- Port Specific ----------
+ # These files are built for each example since it depends on example's tusb_config.h
+ target_sources(${TARGET} PUBLIC
+ # TinyUSB Port
+ ${TOP}/src/portable/nordic/nrf5x/dcd_nrf5x.c
+ # BSP
+ ${CMAKE_CURRENT_FUNCTION_LIST_DIR}/family.c
+ ${CMAKE_CURRENT_FUNCTION_LIST_DIR}/../board.c
+ )
+ target_include_directories(${TARGET} PUBLIC
+ # family, hw, board
+ ${CMAKE_CURRENT_FUNCTION_LIST_DIR}
+ ${CMAKE_CURRENT_FUNCTION_LIST_DIR}/../../
+ ${CMAKE_CURRENT_FUNCTION_LIST_DIR}/boards/${BOARD}
+ )
+
+ #---------- TinyUSB ----------
+ # tinyusb target is built for each example since it depends on example's tusb_config.h
+ set(TINYUSB_TARGET_PREFIX ${TARGET}-)
+ add_library(${TARGET}-tinyusb_config INTERFACE)
+
+ target_include_directories(${TARGET}-tinyusb_config INTERFACE
+ ${CMAKE_CURRENT_SOURCE_DIR}/src
+ )
+ target_compile_definitions(${TARGET}-tinyusb_config INTERFACE
+ CFG_TUSB_MCU=OPT_MCU_NRF5X
+ )
+
+ # tinyusb's CMakeList.txt
+ add_subdirectory(${TOP}/src ${CMAKE_CURRENT_BINARY_DIR}/tinyusb)
+
+ # Link dependencies
+ target_link_libraries(${TARGET} PUBLIC ${BOARD_TARGET} ${TARGET}-tinyusb)
+
+ # group target (not yet supported by clion)
+ set_target_properties(${TARGET}-tinyusb ${TARGET}-tinyusb_config
+ PROPERTIES FOLDER ${TARGET}_sub
+ )
+
+ #---------- Flash ----------
+ # Flash using pyocd
+ add_custom_target(${TARGET}-pyocd
+ COMMAND pyocd flash -t ${PYOCD_TARGET} $
+ )
+
+ # Flash using NXP LinkServer (redlink)
+ # https://www.nxp.com/design/software/development-software/mcuxpresso-software-and-tools-/linkserver-for-microcontrollers:LINKERSERVER
+ # LinkServer has a bug that can only execute with full path otherwise it throws:
+ # realpath error: No such file or directory
+ execute_process(COMMAND which LinkServer OUTPUT_VARIABLE LINKSERVER_PATH OUTPUT_STRIP_TRAILING_WHITESPACE)
+ add_custom_target(${TARGET}-nxplink
+ COMMAND ${LINKSERVER_PATH} flash ${NXPLINK_DEVICE} load $
+ )
+
+endfunction()
+
+
+function(family_add_freertos TARGET)
+ # freertos_config
+ add_subdirectory(${CMAKE_CURRENT_FUNCTION_LIST_DIR}/FreeRTOSConfig ${CMAKE_CURRENT_BINARY_DIR}/freertos_config)
+
+ ## freertos
+ if (NOT TARGET freertos_kernel)
+ add_subdirectory(${CMAKE_CURRENT_FUNCTION_LIST_DIR}/../../../lib/FreeRTOS-Kernel ${CMAKE_CURRENT_BINARY_DIR}/freertos_kernel)
+ endif ()
+
+ # Add FreeRTOS option to tinyusb_config
+ target_compile_definitions(${TARGET}-tinyusb_config INTERFACE
+ CFG_TUSB_OS=OPT_OS_FREERTOS
+ )
+ # link tinyusb with freeRTOS kernel
+ target_link_libraries(${TARGET}-tinyusb PUBLIC
+ freertos_kernel
+ )
+ target_link_libraries(${TARGET} PUBLIC
+ freertos_kernel
+ )
+endfunction()
+
+function(family_configure_device_example TARGET)
+ family_configure_target(${TARGET})
+endfunction()
+
+function(family_configure_host_example TARGET)
+ family_configure_target(${TARGET})
+endfunction()
+
+function(family_configure_dual_usb_example TARGET)
+ family_configure_target(${TARGET})
+endfunction()