keil hacker: https://zhuanlan.zhihu.com/p/375385022

https://blog.csdn.net/ChenGuiGan/article/details/80218875

Compiler version: ARM Compiler 5.06

Complete
TODO: bug in RTC module(because battery out of power)

Completed
lvgl_calc transplant from https://github.com/100askTeam/lv_lib_100ask.git
Completed: '^' operator and '(' ')' operator
Completed: Binary mode
Completed: Equation solving part
TODO: factorial operater (change to back button for main page initialization)
TODO: long equation display (replaced by input history)
TODO: error handling (only invalid equation and divided by 0 can be detected)

Completed

Completed (Game 2048)
Game 2048 transplant from https://github.com/100askTeam/lv_lib_100ask.git