External Interrupt on STM32F4Discovery Board using button user

本系统是基于STM32F4Discovery板卡的一种具有多种功能的老人监护设备，有两部分组成，第一部分为摔倒检测装置，检测到摔倒后可以通过两种方式来实现短信或来电报警.-The system is based on the STM32F4Discoy board with a variety of functions of the elderly monitoring equipment, there are two parts, the first part of the fall dete