Advanced Raspberry Pi: Raspbian Linux and GPIO Integration

© Warren Gay 2018

Warren GayAdvanced Raspberry Pihttps://doi.org/10.1007/978-1-4842-3948-3_15

15. I²C Bus

Warren Gay¹ 

(1)

St. Catharine’s, Ontario, Canada

 

The I²C bus, also known as the two-wire interface (TWI), was developed by Philips circa 1982 to allow communication with lower-speed peripherals.¹⁷ It was also economical because it only required two wires (excluding ground and power). Since then, other standards have been devised, building upon this framework, such as the SMBus. However, the original I²C bus remains popular as a simple, cost-effective way to connect peripherals.

I²C Overview

Figure 15-1 shows the I²C bus in the Raspberry Pi context. The Raspberry Pi provides the bus using the BCM2835 device as the bus master. Notice that the Pi ...