科学计数器源码，可以执行普通计算器的计算功能，也可以参考自作单片机计算器。-Scientific counter source, you can perform the calculation of ordinary calculator functions, it can refer to self-made single-chip calculator.

单片机接口脉冲累加计数器调试代码，可供参考-Microcontroller interface pulse accumulation counter debug code, for reference