daisy chain control

What Is SPI? How the Serial Peripheral Interface Works

SPI, or Serial Peripheral Interface, is a synchronous, full-duplex serial communication protocol used to connect a controller to one or more peripherals.

SPI Protocol: Signals, Modes, Timing, and Implementation

The SPI protocol is a preferred protocol for short-distance communication between microcontrollers and peripherals. This reference covers the signals, the four SPI modes, multi-device wiring, timing, and real-world integration challenges you need to know to use it well.