SPI（Serial Peripheral Interface）是一种串行同步通讯协议，由一个主设备和一个或多个从设备组成，主设备启动一个与从设备的同步通讯，从而完成数据的交换。-SPI (Serial Peripheral Interface) is a serial synchronous communications protocol, by a master and one or more slave devices composed of master and slave devices to start an exchange of synchronous communication, thus completing the data