HC-SR04超声波测距Verilog驱动程序，包含了驱动代码和测试程序，其中驱动程序输出的是回响高电平持续的时间长度，单位us，测量精度高达0.17mm，程序改进过很多次，本次的程序应该没什么问题了。-HC-SR04 Ultrasonic Ranging Verilog drivers, including the driver code and test procedures, which the driver sustained high output is echoed the length of time, in us, the measurement accuracy up to 0.17mm, the program improved many times, this The program should be no problem.