说明：  用C语言编程对模拟量进行采集，单片机采用STM32，用SPI协议去读写AD7705，精度高，稳定性好，适合前端模拟量采集。
(C language programming is used to collect analog data, MCU uses STM32, and SPI protocol is used to read and write AD7705. It has high precision, good stability, and is suitable for front-end analog acquisition.)