ʾʹõԴ
LED1         --   PB14
BUTTON_USER  --   PC13

ʾḶ́
1ϵʱӣ
   PLL 48MHzPLLʱԴRCH
2ʼLED1USER
   USERʱEXTIжϣEXTIжϺжȡ/ж״̬ȫֱ־
3ÿһΰLED1лһ