ʾʹõԴ
LED          --   PB1
BUTTON_USER  --   PB2

ʾḶ́
1ϵʱӣ
   ϵͳʱԴRCH ,48M
2ʼLED1USER
   USERʱEXTIжϣEXTIжϺжȡ/ж״̬ȫֱ־
3ÿһΰLEDлһ