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