Advanced Raspberry Pi: Raspbian Linux and GPIO Integration

© Warren Gay 2018

Warren GayAdvanced Raspberry Pihttps://doi.org/10.1007/978-1-4842-3948-3_16

16. SPI Bus

Warren Gay¹ 

(1)

St. Catharine’s, Ontario, Canada

 

The Serial Peripheral Interface bus, known affectionately as spy, is a synchronous serial interface that was named by Motorola.¹⁸ The SPI protocol operates in full-duplex mode, allowing it to send and receive data simultaneously. Generally speaking, SPI has a speed advantage over the I²C protocol but requires more connections.

SPI Basics

Devices on the SPI bus communicate on a master/slave basis. Multiple slaves coexist on a given SPI bus, with each slave being selected for communication by a slave select signal (also known as chip select). Figure 16-1 shows the Raspberry Pi as the master communicating ...