单片机的底层串口升级程序，可以适用于任何可自编程的单片机，本工程默认定位在0xF000地址，可根据需要在配置文件里更改。用户的应用程序只需定义如下函数指针void ( *update )()=0xF000 然后调用update() 就可以跳转到升级程序进行串口升级操作。-Microcontroller serial port to upgrade the underlying process can be applied to any self-programming of the MCU, this works by default located in the 0xF000 address, according to need changes in the configuration file. Users simply defined as the application function pointer void (* update) () = 0xF000　then call update ()　you can jump to the serial port upgrade procedure to upgrade operations.