此程序使用STM32实现了频率计的功能，当频率比较低时，测量结果十分准确。高频时，略有误差，但是不能侧得的频率过高。-This program uses the STM32 implements frequency meter function, when the frequency is relatively low, the measuring results are very accurate. High frequencies, a slight error, but not too e

本代码包含stm32单片机与FPGA两部分，通过FPGA实现频率、时间间隔以及相位差的测量并通过spi与stm32通信，在stm32上实现数据的运算与显示。-This code contains two parts stm32 MCU and FPGA, frequency, time interval and phase measurements and by spi communication with stm32, on stm32 achieve computing and displa