在2812上用c写的超声波流量计的代码，所有的都编译通过，用的是相关法做的。-Written in 2812 on the ultrasonic flowmeter with c code, all are compiled, using the relevant law to do.

超声波测水深C++源代码，可在Keil4运行，已调试。-Ultrasonic measuring depth C++ source code can be run in Keil4, debugging.