RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ 4820dbb0b3a15a62f4cd5f3e20fb4e02e4bfbb20

Meco Man bd80b7a4a1 对finsh_set_device调用增加宏定义限制		%!s(int64=4) %!d(string=hai) anos
..
applications	bd80b7a4a1 对finsh_set_device调用增加宏定义限制	%!s(int64=4) %!d(string=hai) anos
asflib_config	189c999f8e add atmel SAM D21 bsp support	%!s(int64=8) %!d(string=hai) anos
board	ef62febf1f [SConscript]update group name	%!s(int64=5) %!d(string=hai) anos
sam_d2x_asflib	62058e18fe [bsp][samd21] update scons script.	%!s(int64=7) %!d(string=hai) anos
README.txt	84f0d9f988 Update README.txt	%!s(int64=8) %!d(string=hai) anos
SAM_D2X_RTT.sct	5b1235f5f5 add scons cmd build	%!s(int64=8) %!d(string=hai) anos
SConscript	189c999f8e add atmel SAM D21 bsp support	%!s(int64=8) %!d(string=hai) anos
SConstruct	b1baf42d4e Revert "Fix compiler flags issue"	%!s(int64=4) %!d(string=hai) anos
project.uvprojx	0f3563fd64 [BSP] Update project files	%!s(int64=8) %!d(string=hai) anos
rtconfig.h	0d7ba79219 Remove the DBG_COLOR and DBG_ENABLE definition.	%!s(int64=6) %!d(string=hai) anos
rtconfig.py	62058e18fe [bsp][samd21] update scons script.	%!s(int64=7) %!d(string=hai) anos
template.uvprojx	189c999f8e add atmel SAM D21 bsp support	%!s(int64=8) %!d(string=hai) anos

		
				README.txt
			
				使用SAMD21-Xplained-Pro开发板
scons:
  scons
  scons --target=mdk5
demo代码演示了串口、外部中断、RTC低功耗唤醒