o Renaming everything from nRF51 to nRF5x to better match the SDK.

o Using the correct startup code based on chip family.
o Adding -flash and -softdevice-flash goals if nrfjprog is available.

6 files changed, 173 insertions, 149 deletions

diff --git a/mcu.cmake b/mcu.cmake
index 1c482f1..df06a26 100644
--- a/mcu.cmake
+++ b/mcu.cmake
@@ -1,7 +1,10 @@
 if (NOT MCU_CHIP)
     message(FATAL_ERROR "Missing required argument CHIP.")
 elseif (MCU_CHIP MATCHES "nrf5.*")
-    set(CMAKE_TOOLCHAIN_FILE "${CMAKE_CURRENT_LIST_DIR}/nrf51.cmake")
+    set(CMAKE_TOOLCHAIN_FILE "${CMAKE_CURRENT_LIST_DIR}/nrf5x.cmake")
+
+    include(${CMAKE_CURRENT_LIST_DIR}/nrf5x/nrfjprog.cmake)
+    include(${CMAKE_CURRENT_LIST_DIR}/nrf5x/utils.cmake)
 elseif (MCU_CHIP MATCHES D2000)
     set(CMAKE_TOOLCHAIN_FILE "${CMAKE_CURRENT_LIST_DIR}/intel-quark-d2000.toolchain.cmake")
 else ()
@@ -9,4 +12,3 @@ else ()
 endif ()
 
 include(${CMAKE_CURRENT_LIST_DIR}/mcu_include_directories_from_sources.cmake)
-include(${CMAKE_CURRENT_LIST_DIR}/nrf51/nrfjprog.cmake)
diff --git a/nrf51.cmake b/nrf51.cmake
deleted file mode 100644
index f2ecff3..0000000
--- a/nrf51.cmake
+++ /dev/null
@@ -1,28 +0,0 @@
-set(MCU_NRF51_LOADED TRUE CACHE BOOL INTERNAL)
-
-include(${CMAKE_CURRENT_LIST_DIR}/nrf51/utils.cmake)
-
-mcu_nrf51_detect_sdk()
-
-find_program(ARM_CC arm-none-eabi-gcc ${TOOLCHAIN_DIR}/bin)
-find_program(ARM_CXX arm-none-eabi-g++ ${TOOLCHAIN_DIR}/bin)
-find_program(ARM_OBJCOPY arm-none-eabi-objcopy ${TOOLCHAIN_DIR}/bin)
-find_program(ARM_SIZE_TOOL arm-none-eabi-size ${TOOLCHAIN_DIR}/bin)
-
-set(_CMAKE_TOOLCHAIN_PREFIX arm-none-eabi-)
-include(CMakeFindBinUtils)
-
-#message("ARM_CC=${ARM_CC}")
-#message("ARM_CXX=${ARM_CXX}")
-#message("ARM_OBJCOPY=${ARM_OBJCOPY}")
-#message("ARM_SIZE_TOOL=${ARM_SIZE_TOOL}")
-
-# Old style, before 3.6
-#include(CMakeForceCompiler)
-#CMAKE_FORCE_C_COMPILER(${ARM_CC} GNU)
-#CMAKE_FORCE_CXX_COMPILER(${ARM_CXX} GNU)
-
-# New style, 3.6+
-set(CMAKE_C_COMPILER ${ARM_CC} CACHE FILE "")
-set(CMAKE_CXX_COMPILER ${ARM_CXX} CACHE FILE "")
-set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
diff --git a/nrf51/nrfjprog.cmake b/nrf51/nrfjprog.cmake
deleted file mode 100644
index dde9c94..0000000
--- a/nrf51/nrfjprog.cmake
+++ /dev/null
@@ -1,45 +0,0 @@
-if (MCU_NRFJPROG OR NRFJPROG STREQUAL "NRFJPROG-NOTFOUND")
-    return()
-endif ()
-
-find_program(MCU_NRFJPROG nrfjprog VERBOSE)
-set(MCU_NRFJPROG ${MCU_NRFJPROG} CACHE FILE "Path to nrfjprog")
-
-if (MCU_NRFJPROG)
-    message("MCU: found nrfjprog: ${MCU_NRFJPROG}")
-else ()
-    message("MCU: nrfjprog not found")
-endif ()
-
-function(_nrf51_try_add_nrfjprog_targets T)
-    if (MCU_NRFJPROG)
-        _nrf51_add_nrfjprog_targets(${T})
-    endif ()
-endfunction()
-
-function(_nrf51_add_nrfjprog_targets T)
-    if (${MCU_CHIP} MATCHES "nrf51.*")
-        set(chip_series nrf51)
-    elseif (${MCU_CHIP} MATCHES "nrf52.*")
-        set(chip_series nrf52)
-    else ()
-        return()
-    endif ()
-
-    add_custom_target(${T}-flash
-        COMMAND ${MCU_NRFJPROG} -f ${chip_series} --sectorerase --program $<TARGET_FILE:${T}>.hex
-        COMMAND ${MCU_NRFJPROG} -f ${chip_series} --reset
-        DEPENDS $<TARGET_FILE:${T}>.hex
-        COMMENT "Flashing: ${T}")
-
-    #[[
-    get_target_property(MCU_SOFTDEVICE ${T} MCU_SOFTDEVICE)
-    if (MCU_SOFTDEVICE)
-        add_custom_target(${T}-flash-softdevice
-            COMMAND ${MCU_NRFJPROG} -f ${chip_series} --chiperase --program
-            COMMAND ${MCU_NRFJPROG} -f ${chip_series} --reset
-            DEPENDS $<TARGET_FILE:${T}>.hex
-            COMMENT "Flashing: ${T}")
-    endif ()
-    ]]
-endfunction()
diff --git a/nrf5x.cmake b/nrf5x.cmake
new file mode 100644
index 0000000..2f37500
--- /dev/null
+++ b/nrf5x.cmake
@@ -0,0 +1,76 @@
+# Toolchain files are executed many times when detecting c/c++ compilers, but it will only read the cache on the first
+# exeuction so the paths has to be saved to the environment as it is shared between executions.
+function(mcu_nrf5_detect_sdk)
+    if (MCU_NRF5X_SDK_PATH)
+        # message("MCU: NRF5x SDK already found: ${MCU_NRF5X_SDK_PATH}")
+        return()
+    endif ()
+
+    set(MCU_NRF5X_SDK_PATH "$ENV{_MCU_NRF5X_SDK_PATH}")
+
+    if (MCU_NRF5X_SDK_PATH)
+        # message("MCU: NRF5x SDK already found from ENV: ${MCU_NRF5X_SDK_PATH}")
+        return()
+    endif ()
+
+    message("MCU: Detecting NRF5x SDK")
+
+    if (NOT MCU_NRF5X_SDK)
+        set(MCU_NRF5X_SDK "" CACHE PATH "" FORCE)
+        message(FATAL_ERROR "MCU: MCU_NRF5X_SDK parameter cannot be empty.")
+        return()
+    endif ()
+
+    get_filename_component(MCU_NRF5X_SDK_PATH "${MCU_NRF5X_SDK}" ABSOLUTE)
+
+    set(ENV{_MCU_NRF5X_SDK_PATH} "${MCU_NRF5X_SDK_PATH}")
+
+    set(NOTES ${MCU_NRF5X_SDK_PATH}/documentation/release_notes.txt)
+
+    if (NOT EXISTS ${NOTES})
+        message(FATAL_ERROR "MCU: Could not find 'documentation/release_notes.txt' under NRF SDK path: ${NOTES}")
+    endif ()
+
+    file(STRINGS ${NOTES} NOTES_LIST)
+    list(GET NOTES_LIST 0 NOTES_0)
+
+    if (NOTES_0 MATCHES "nRF5.? SDK [^0-9]*([\\.0-9]*)")
+        set(MCU_NRF5X_SDK_VERSION "${CMAKE_MATCH_1}")
+    else ()
+        message(FATAL_ERROR "MCU: Could not detect SDK version.")
+        return()
+    endif ()
+
+    message("MCU: nRF5x SDK Path: ${MCU_NRF5X_SDK_PATH} (Version: ${MCU_NRF5X_SDK_VERSION})")
+
+    set(MCU_NRF5X_SDK_VERSION "${MCU_NRF5X_SDK_VERSION}" CACHE STRING "MCU: nRF5x SDK version" FORCE)
+    set(MCU_NRF5X_SDK_PATH "${MCU_NRF5X_SDK_PATH}" CACHE PATH "MCU: nRF5x SDK path" FORCE)
+endfunction()
+
+set(MCU_NRF5X_LOADED TRUE CACHE BOOL INTERNAL)
+
+mcu_nrf5_detect_sdk()
+
+find_program(ARM_CC arm-none-eabi-gcc ${TOOLCHAIN_DIR}/bin)
+find_program(ARM_CXX arm-none-eabi-g++ ${TOOLCHAIN_DIR}/bin)
+find_program(ARM_OBJCOPY arm-none-eabi-objcopy ${TOOLCHAIN_DIR}/bin)
+find_program(ARM_SIZE_TOOL arm-none-eabi-size ${TOOLCHAIN_DIR}/bin)
+find_program(ARM_NM arm-none-eabi-nm ${TOOLCHAIN_DIR}/bin)
+
+set(_CMAKE_TOOLCHAIN_PREFIX arm-none-eabi-)
+include(CMakeFindBinUtils)
+
+#message("ARM_CC=${ARM_CC}")
+#message("ARM_CXX=${ARM_CXX}")
+#message("ARM_OBJCOPY=${ARM_OBJCOPY}")
+#message("ARM_SIZE_TOOL=${ARM_SIZE_TOOL}")
+
+# Old style, before 3.6
+#include(CMakeForceCompiler)
+#CMAKE_FORCE_C_COMPILER(${ARM_CC} GNU)
+#CMAKE_FORCE_CXX_COMPILER(${ARM_CXX} GNU)
+
+# New style, 3.6+
+set(CMAKE_C_COMPILER ${ARM_CC} CACHE FILE "")
+set(CMAKE_CXX_COMPILER ${ARM_CXX} CACHE FILE "")
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
diff --git a/nrf5x/nrfjprog.cmake b/nrf5x/nrfjprog.cmake
new file mode 100644
index 0000000..8ebf274
--- /dev/null
+++ b/nrf5x/nrfjprog.cmake
@@ -0,0 +1,37 @@
+if (NOT MCU_NRFJPROG AND NOT NRFJPROG STREQUAL "NRFJPROG-NOTFOUND")
+    find_program(MCU_NRFJPROG nrfjprog VERBOSE)
+    set(MCU_NRFJPROG ${MCU_NRFJPROG} CACHE FILE "Path to nrfjprog")
+
+    if (MCU_NRFJPROG)
+        message("MCU: found nrfjprog: ${MCU_NRFJPROG}")
+    else ()
+        message("MCU: nrfjprog not found")
+    endif ()
+endif ()
+
+function(_nrf5_try_add_nrfjprog_targets T)
+    if (MCU_NRFJPROG)
+        _nrf5_add_nrfjprog_targets(${T})
+    endif ()
+endfunction()
+
+function(_nrf5_add_nrfjprog_targets T)
+    get_target_property(MCU_SOFTDEVICE ${T} MCU_SOFTDEVICE)
+    get_target_property(MCU_NRF5X_CHIP_SERIES ${T} MCU_NRF5X_CHIP_SERIES)
+
+    add_custom_target(${T}-flash
+            COMMAND ${MCU_NRFJPROG} -f ${MCU_NRF5X_CHIP_SERIES} --sectorerase --program $<TARGET_FILE:${T}>.hex
+            COMMAND ${MCU_NRFJPROG} -f ${MCU_NRF5X_CHIP_SERIES} --reset
+            DEPENDS $<TARGET_FILE:${T}>.hex
+            COMMENT "Flashing: ${T}")
+
+    get_target_property(MCU_SOFTDEVICE ${T} MCU_SOFTDEVICE)
+    get_target_property(MCU_SOFTDEVICE_HEX ${T} MCU_SOFTDEVICE_HEX)
+    if (MCU_SOFTDEVICE AND MCU_SOFTDEVICE_HEX)
+        add_custom_target(${T}-flash-softdevice
+                COMMAND ${MCU_NRFJPROG} -f ${MCU_NRF5X_CHIP_SERIES} --chiperase --program ${MCU_SOFTDEVICE_HEX}
+                COMMAND ${MCU_NRFJPROG} -f ${MCU_NRF5X_CHIP_SERIES} --reset
+                DEPENDS $<TARGET_FILE:${T}>.hex
+                COMMENT "Flashing: ${T}")
+    endif ()
+endfunction()
diff --git a/nrf51/utils.cmake b/nrf5x/utils.cmake
index 8afa5cc..c4365a3 100644
--- a/nrf51/utils.cmake
+++ b/nrf5x/utils.cmake
@@ -1,8 +1,14 @@
-function(mcu_nrf5_startup_files VAR)
-    if ("${MCU_NRF51_SDK_VERSION}" VERSION_LESS 12)
-        set(startup "${MCU_NRF51_SDK_PATH}/components/toolchain/gcc/gcc_startup_nrf51.s")
+include(${CMAKE_CURRENT_LIST_DIR}/nrfjprog.cmake)
+
+function(_nrf5_startup_files T VAR)
+    get_target_property(MCU_NRF5X_CHIP_SERIES ${T} MCU_NRF5X_CHIP_SERIES)
+
+    target_sources(${ARGS_TARGET} PUBLIC "${MCU_NRF5X_SDK_PATH}/components/toolchain/system_${MCU_NRF5X_CHIP_SERIES}.c")
+
+    if ("${MCU_NRF5X_SDK_VERSION}" VERSION_LESS 12)
+        set(startup "${MCU_NRF5X_SDK_PATH}/components/toolchain/gcc/gcc_startup_${MCU_NRF5X_CHIP_SERIES}.s")
     else ()
-        set(startup "${MCU_NRF51_SDK_PATH}/components/toolchain/gcc/gcc_startup_nrf51.S")
+        set(startup "${MCU_NRF5X_SDK_PATH}/components/toolchain/gcc/gcc_startup_${MCU_NRF5X_CHIP_SERIES}.S")
     endif ()
 
     set(${VAR} ${startup} PARENT_SCOPE)
@@ -20,17 +26,26 @@ function(mcu_add_executable)
         message(FATAL_ERROR "MCU: Missing required argument: TARGET")
     endif ()
 
-    target_sources(${ARGS_TARGET} PUBLIC "${MCU_NRF51_SDK_PATH}/components/toolchain/system_nrf51.c")
+    if (${MCU_CHIP} MATCHES "nrf51.*")
+        set(chip_series nrf51)
+    elseif (${MCU_CHIP} MATCHES "nrf52.*")
+        set(chip_series nrf52)
+    else()
+        message(FATAL_ERROR "MCU: Unsupported chip: ${MCU_CHIP}")
+        return()
+    endif ()
 
-    # 12 might be too old
-    if ("${MCU_NRF51_SDK_VERSION}" VERSION_LESS 12)
-        target_sources(${ARGS_TARGET} PUBLIC "${MCU_NRF51_SDK_PATH}/components/toolchain/gcc/gcc_startup_nrf51.s")
-    else ()
-        target_sources(${ARGS_TARGET} PUBLIC "${MCU_NRF51_SDK_PATH}/components/toolchain/gcc/gcc_startup_nrf51.S")
+    if (chip_series)
+        set_target_properties(${ARGS_TARGET} PROPERTIES MCU_NRF5X_CHIP_SERIES "${chip_series}")
     endif ()
 
+    _nrf5_startup_files(${ARGS_TARGET} STARTUP_FILES)
+    target_sources(${ARGS_TARGET} PUBLIC ${STARTUP_FILES})
+
     target_compile_options(${ARGS_TARGET} PUBLIC -Wall -Werror -g3 -O3)
 
+    target_link_libraries(${ARGS_TARGET} PRIVATE -Wl,-Map=${ARGS_TARGET}.map)
+
     # -Wall -Werror -O3 -g3
     if (${MCU_CHIP} MATCHES "nrf51.*")
         target_compile_options(${ARGS_TARGET} PUBLIC
@@ -72,15 +87,31 @@ function(mcu_add_executable)
     set_target_properties(${ARGS_TARGET} PROPERTIES SDK_CONFIG "${SDK_CONFIG}")
 
     if (ARGS_SOFTDEVICE)
+        if ("${MCU_NRF5X_SDK_VERSION}" VERSION_EQUAL 12 AND ARGS_SOFTDEVICE STREQUAL 130)
+            set(hex "${MCU_NRF5X_SDK_PATH}/components/softdevice/s130/hex/s130_nrf51_2.0.1_softdevice.hex")
+        elseif ("${MCU_NRF5X_SDK_VERSION}" VERSION_EQUAL 12 AND ARGS_SOFTDEVICE STREQUAL 132)
+            set(hex "${MCU_NRF5X_SDK_PATH}/components/softdevice/s132/hex/s132_nrf52_3.0.0_softdevice.hex")
+        else ()
+            message(WARNING "Unknown combination of SDK version (${MCU_NRF5X_SDK_VERSION}) and softdevice (${ARGS_SOFTDEVICE}). Some features might be unavailable.")
+        endif ()
+
         set_target_properties(${ARGS_TARGET} PROPERTIES MCU_SOFTDEVICE "${ARGS_SOFTDEVICE}")
+
+        if (hex)
+            set_target_properties(${ARGS_TARGET} PROPERTIES MCU_SOFTDEVICE_HEX "${hex}")
+        endif ()
     endif ()
 
     _nrf5_set_from_main_target(${ARGS_TARGET})
 
     add_custom_command(TARGET ${ARGS_TARGET} POST_BUILD
         COMMAND ${CMAKE_OBJCOPY} -O ihex $<TARGET_FILE:${ARGS_TARGET}> $<TARGET_FILE:${ARGS_TARGET}>.hex)
+    add_custom_command(TARGET ${ARGS_TARGET} POST_BUILD
+        COMMAND ${CMAKE_OBJCOPY} -O binary $<TARGET_FILE:${ARGS_TARGET}> $<TARGET_FILE:${ARGS_TARGET}>.bin)
+    add_custom_command(TARGET ${ARGS_TARGET} POST_BUILD
+        COMMAND ${CMAKE_NM} $<TARGET_FILE:${ARGS_TARGET}> > $<TARGET_FILE:${ARGS_TARGET}>.nm)
 
-    _nrf51_try_add_nrfjprog_targets(${ARGS_TARGET})
+    _nrf5_try_add_nrfjprog_targets(${ARGS_TARGET})
 
 endfunction()
 
@@ -91,10 +122,10 @@ function(_nrf5_set_from_main_target T)
     target_compile_definitions(${T} PUBLIC ${CHIP_DEFINES})
 
     target_include_directories(${T} PUBLIC
-        ${MCU_NRF51_SDK_PATH}/components/device
-        ${MCU_NRF51_SDK_PATH}/components/toolchain
-        ${MCU_NRF51_SDK_PATH}/components/toolchain/gcc
-        ${MCU_NRF51_SDK_PATH}/components/toolchain/cmsis/include
+        ${MCU_NRF5X_SDK_PATH}/components/device
+        ${MCU_NRF5X_SDK_PATH}/components/toolchain
+        ${MCU_NRF5X_SDK_PATH}/components/toolchain/gcc
+        ${MCU_NRF5X_SDK_PATH}/components/toolchain/cmsis/include
         )
 
     get_target_property(SDK_CONFIG ${T} SDK_CONFIG)
@@ -108,10 +139,10 @@ function(_nrf5_set_from_main_target T)
     target_include_directories(${T} PUBLIC ${SOFTDEVICE_INCLUDES})
     target_compile_definitions(${T} PUBLIC ${SOFTDEVICE_DEFINES})
 
-    list(APPEND link_libraries -L${MCU_NRF51_SDK_PATH}/components/toolchain/gcc)
+    list(APPEND link_libraries -L${MCU_NRF5X_SDK_PATH}/components/toolchain/gcc)
 
     if (SOFTDEVICE)
-        set(ld ${MCU_NRF51_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/toolchain/armgcc/armgcc_s${SOFTDEVICE}_${MCU_CHIP}.ld)
+        set(ld ${MCU_NRF5X_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/toolchain/armgcc/armgcc_s${SOFTDEVICE}_${MCU_CHIP}.ld)
 
         if (NOT EXISTS ${ld})
             message(FATAL_ERROR "No linker script defined for combination: softdevice=${SOFTDEVICE} and chip=${MCU_CHIP}: expected location: ${ld}")
@@ -121,9 +152,9 @@ function(_nrf5_set_from_main_target T)
         list(APPEND link_libraries -T${ld})
     else ()
         if (${MCU_CHIP} MATCHES "nrf51.*_xxaa")
-            list(APPEND link_libraries -T${MCU_NRF51_SDK_PATH}/components/toolchain/gcc/nrf51_xxaa.ld)
+            list(APPEND link_libraries -T${MCU_NRF5X_SDK_PATH}/components/toolchain/gcc/nrf51_xxaa.ld)
         elseif (${MCU_CHIP} MATCHES "nrf52.*_xxaa")
-            list(APPEND link_libraries -T${MCU_NRF51_SDK_PATH}/components/toolchain/gcc/nrf52_xxaa.ld)
+            list(APPEND link_libraries -T${MCU_NRF5X_SDK_PATH}/components/toolchain/gcc/nrf52_xxaa.ld)
         else ()
             message(FATAL_ERROR "MCU: Unsupported nRF MCU chip: ${MCU_CHIP}")
         endif ()
@@ -159,70 +190,21 @@ endfunction()
 function(_nrf_softdevice_includes SOFTDEVICE INCLUDES_VAR DEFINES_VAR)
     # message("_nrf_softdevice_includes: SOFTDEVICE=${SOFTDEVICE}")
     if (SOFTDEVICE)
-        list(APPEND includes ${MCU_NRF51_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/headers)
+        list(APPEND includes ${MCU_NRF5X_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/headers)
 
-        if (EXISTS ${MCU_NRF51_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/headers/nrf51)
-            list(APPEND includes ${MCU_NRF51_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/headers/nrf51)
+        if (EXISTS ${MCU_NRF5X_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/headers/nrf51)
+            list(APPEND includes ${MCU_NRF5X_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/headers/nrf51)
         endif ()
 
-        if (EXISTS ${MCU_NRF51_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/headers/nrf52)
-            list(APPEND includes ${MCU_NRF51_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/headers/nrf52)
+        if (EXISTS ${MCU_NRF5X_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/headers/nrf52)
+            list(APPEND includes ${MCU_NRF5X_SDK_PATH}/components/softdevice/s${SOFTDEVICE}/headers/nrf52)
         endif ()
 
         list(APPEND defines S${SOFTDEVICE} SOFTDEVICE_PRESENT)
     else ()
-        list(APPEND includes ${MCU_NRF51_SDK_PATH}/components/drivers_nrf/nrf_soc_nosd)
+        list(APPEND includes ${MCU_NRF5X_SDK_PATH}/components/drivers_nrf/nrf_soc_nosd)
     endif ()
 
     set(${INCLUDES_VAR} ${includes} PARENT_SCOPE)
     set(${DEFINES_VAR} ${defines} PARENT_SCOPE)
 endfunction()
-
-# Toolchain files are executed many times when detecting c/c++ compilers, but it will only read the cache on the first
-# exeuction so the paths has to be saved to the environment as it is shared between executions.
-function(mcu_nrf51_detect_sdk)
-    if (MCU_NRF51_SDK_PATH)
-        # message("MCU: NRF51 SDK already found: ${MCU_NRF51_SDK_PATH}")
-        return()
-    endif ()
-
-    set(MCU_NRF51_SDK_PATH "$ENV{_MCU_NRF51_SDK_PATH}")
-
-    if (MCU_NRF51_SDK_PATH)
-        # message("MCU: NRF51 SDK already found from ENV: ${MCU_NRF51_SDK_PATH}")
-        return()
-    endif ()
-
-    message("MCU: Detecting NRF51 SDK")
-
-    if (NOT MCU_NRF51_SDK)
-        set(MCU_NRF51_SDK "" CACHE PATH "" FORCE)
-        message(FATAL_ERROR "MCU: MCU_NRF51_SDK parameter cannot be empty.")
-        return()
-    endif ()
-
-    get_filename_component(MCU_NRF51_SDK_PATH "${MCU_NRF51_SDK}" ABSOLUTE)
-
-    set(ENV{_MCU_NRF51_SDK_PATH} "${MCU_NRF51_SDK_PATH}")
-
-    set(NOTES ${MCU_NRF51_SDK_PATH}/documentation/release_notes.txt)
-
-    if (NOT EXISTS ${NOTES})
-        message(FATAL_ERROR "MCU: Could not find 'documentation/release_notes.txt' under NRF SDK path: ${NOTES}")
-    endif ()
-
-    file(STRINGS ${NOTES} NOTES_LIST)
-    list(GET NOTES_LIST 0 NOTES_0)
-
-    if (NOTES_0 MATCHES "nRF5.? SDK [^0-9]*([\\.0-9]*)")
-        set(MCU_NRF51_SDK_VERSION "${CMAKE_MATCH_1}")
-    else ()
-        message(FATAL_ERROR "MCU: Could not detect SDK version.")
-        return()
-    endif ()
-
-    message("MCU: nRF51 SDK Path: ${MCU_NRF51_SDK_PATH} (Version: ${MCU_NRF51_SDK_VERSION})")
-
-    set(MCU_NRF51_SDK_VERSION "${MCU_NRF51_SDK_VERSION}" CACHE STRING "MCU: nRF51 SDK version" FORCE)
-    set(MCU_NRF51_SDK_PATH "${MCU_NRF51_SDK_PATH}" CACHE PATH "MCU: nRF51 SDK path" FORCE)
-endfunction()