change board macro for nrf52 board

- ARDUINO_NRF52_FEATHER for feather52 (previously ARDUINO_FEATHER52).
- ARDUINO_NRF52_METRO for metro52
- ARDUINO_NRF52_ADAFRUIT for both feather52, metro52 and other nrf52
board made by Adafruit.

ARDUINO_FEATHER52 is still defined to be backward compatible with other
libraries.

Author: hathach

boards.txt

@@ -39,10 +39,13 @@ feather52.upload.maximum_data_size=51072
 # Build
 feather52.build.mcu=cortex-m4
 feather52.build.f_cpu=64000000
-feather52.build.board=FEATHER52
+feather52.build.board=NRF52_FEATHER
 feather52.build.core=nRF5
 feather52.build.variant=feather52
 
+# compatiable with other lib only, would remove in the future
+feather52.build.extra_flags=-DARDUINO_FEATHER52
+
 # Debug Menu
 feather52.menu.debug.l0=Level 0 (Release)
 feather52.menu.debug.l0.build.debug_flags=-DCFG_DEBUG=0
@@ -66,10 +69,13 @@ feather52.menu.debug.l2.build.debug_flags=-DCFG_DEBUG=2
 # Build
 #metro52.build.mcu=cortex-m4
 #metro52.build.f_cpu=64000000
-#metro52.build.board=METRO52
+#metro52.build.board=NRF52_METRO
 #metro52.build.core=nRF5
 #metro52.build.variant=metro52
 
+# compatiable with other lib only, would remove in the future
+#metro52.build.extra_flags=-DARDUINO_FEATHER52
+
 # Debug Menu
 #metro52.menu.debug.l0=Level 0 (Release)
 #metro52.menu.debug.l0.build.debug_flags=-DCFG_DEBUG=0

platform.txt

@@ -59,7 +59,7 @@ nrf.sdk.path={build.core.path}/SDK
 rtos.path={build.core.path}/freertos
 nffs.path={runtime.platform.path}/libraries/nffs/src
 
-compiler.nrf.flags=-DNRF5 -DNRF52 -DS132 "-I{nrf.sdk.path}/components/toolchain/" "-I{nrf.sdk.path}/components/toolchain/CMSIS/Include" "-I{nrf.sdk.path}/components/toolchain/gcc/" "-I{nrf.sdk.path}/components/device/" "-I{nrf.sdk.path}/components/drivers_nrf/delay/" "-I{nrf.sdk.path}/components/softdevice/s132/headers/" "-I{rtos.path}/source/include" "-I{rtos.path}/config" "-I{rtos.path}/portable/GCC/nrf52" "-I{rtos.path}/portable/CMSIS/nrf52"
+compiler.nrf.flags=-DNRF5 -DNRF52 -DS132 -DARDUINO_NRF52_ADAFRUIT "-I{nrf.sdk.path}/components/toolchain/" "-I{nrf.sdk.path}/components/toolchain/CMSIS/Include" "-I{nrf.sdk.path}/components/toolchain/gcc/" "-I{nrf.sdk.path}/components/device/" "-I{nrf.sdk.path}/components/drivers_nrf/delay/" "-I{nrf.sdk.path}/components/softdevice/s132/headers/" "-I{rtos.path}/source/include" "-I{rtos.path}/config" "-I{rtos.path}/portable/GCC/nrf52" "-I{rtos.path}/portable/CMSIS/nrf52"
 
 nffs.includes="-I{nffs.path}/fs/nffs/include" "-I{nffs.path}/fs/fs/include" "-I{nffs.path}/util/crc/include" "-I{nffs.path}/kernel/os/include" "-I{nffs.path}/kernel/os/include/os/arch/cortex_m4" "-I{nffs.path}/hw/hal/include" "-I{nffs.path}/sys/flash_map/include"