基本外设接口SPI,IIC,WDG, FSMC,ADC/DAC，SDIO

IIC          https://baike.baidu.com/item/IIC/3524834?fr=aladdin

SPI         https://www.cnblogs.com/deng-tao/p/6004280.html

WDG      http://news.eeworld.com.cn/mcu/article_2017091634474.html

FSMC     https://baike.baidu.com/item/FSMC/7094137?fr=aladdin

ADC/DAC http://www.360doc.com/content/15/0419/16/12109864_464390025.shtml

SDIO       https://baike.baidu.com/item/SDIO/777699?fr=aladdin