用于测试堆栈溢出的小程序，主要功能是弹出一个计算器-A small program used to test the stack overflow, the main function is to pop up a calculator

处理器触发采样 定时器溢出触发采样 模拟比较器触发采样 外部事件(PB4中断)触发采样-Processor to trigger the sampling timer overflow sampling analog comparator trigger sample trigger external events (PB4 interruption) to trigger the sampling