Merge pull request #37 from nihaopaul/master

Added a menu item to set the low freqency crystal. 

boards.txt

@@ -18,6 +18,7 @@
 menu.chip=Chip
 menu.softdevice=Softdevice
 menu.version=Version
+menu.lfclk=Low Frequency Clock
 
 nRF52DK.name=nRF52 DK
 
@@ -56,6 +57,12 @@ nRF52DK.menu.softdevice.s132.upload.maximum_size=409600
 nRF52DK.menu.softdevice.s132.build.extra_flags=-DNRF52 -DS132 -DNRF51_S132
 nRF52DK.menu.softdevice.s132.build.ldscript=armgcc_s132_nrf52832_xxaa.ld
 
+nRF52DK.menu.lfclk.lfxo=Crystal Oscillator
+nRF52DK.menu.lfclk.lfxo.build.lfclk_flags=-DUSE_LFXO
+nRF52DK.menu.lfclk.lfrc=RC Oscillator
+nRF52DK.menu.lfclk.lfrc.build.lfclk_flags=-DUSE_LFRC
+nRF52DK.menu.lfclk.lfsynt=Synthesized
+nRF52DK.menu.lfclk.lfsynt.build.lfclk_flags=-DUSE_LFSYNT
 
 BluzDK.name=Bluz DK
 

platform.txt

@@ -50,6 +50,7 @@ compiler.define=-DARDUINO=
 
 # this can be overriden in boards.txt
 build.extra_flags=
+build.lfclk_flags=
 
 nrf.sdk.path={runtime.platform.path}/cores/nRF5/SDK
 
@@ -69,13 +70,13 @@ compiler.elf2hex.extra_flags=
 # ----------------
 
 ## Compile c files
-recipe.c.o.pattern="{compiler.path}{compiler.c.cmd}" {compiler.c.flags} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.c.extra_flags} {build.extra_flags} {includes} "{source_file}" -o "{object_file}"
+recipe.c.o.pattern="{compiler.path}{compiler.c.cmd}" {compiler.c.flags} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.c.extra_flags} {build.extra_flags} {build.lfclk_flags} {includes} "{source_file}" -o "{object_file}"
 
 ## Compile c++ files
-recipe.cpp.o.pattern="{compiler.path}{compiler.cpp.cmd}" {compiler.cpp.flags} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.cpp.extra_flags} {build.extra_flags}  {includes} "{source_file}" -o "{object_file}"
+recipe.cpp.o.pattern="{compiler.path}{compiler.cpp.cmd}" {compiler.cpp.flags} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.cpp.extra_flags} {build.extra_flags} {build.lfclk_flags} {includes} "{source_file}" -o "{object_file}"
 
 ## Compile S files
-recipe.S.o.pattern="{compiler.path}{compiler.S.cmd}" {compiler.S.flags} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.S.extra_flags} {build.extra_flags} {includes} "{source_file}" -o "{object_file}"
+recipe.S.o.pattern="{compiler.path}{compiler.S.cmd}" {compiler.S.flags} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.S.extra_flags} {build.extra_flags} {build.lfclk_flags} {includes} "{source_file}" -o "{object_file}"
 
 ## Create archives
 recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{archive_file_path}" "{object_file}"