ʾʹõԴ
LED         -----   PB1


ʾḶ́
1ϵϵͳʱӣRCHΪʱԴ48M
2ʼSYSTICK
3ʼLEDGPIOLEDĬϨ
4ʼEXTIʹLPTIM1жϻѵ͹ģ
5ʼLPTIM1ʱѡRCLüʱӲƵ
6ʹLPTIM1NVICжϣ
7ʱ3S
10ʹLPTIM1ԶƥжϣʹLPTIM1дԶװֵ(0x7CFF)
    ÿ1sһԶƥжϣжϷзתLED
11whileѭ壺MCU͹ģʽDeepstop

