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Raspberry Pi Essentials

You're reading from  Raspberry Pi Essentials

Product type Book
Published in Apr 2015
Publisher
ISBN-13 9781784396398
Pages 212 pages
Edition 1st Edition
Languages
Concepts
Author (1):
Jack Creasey Jack Creasey
Profile icon Jack Creasey
LinkedIn
Jack Creasey has been in the technology industry for more than 30 years, the last 15 years as a Senior Program Manager in hardware and software design. His expertise includes designing, developing, and teaching IT courseware. He is an avid inventor and holds 13 patents in hardware and software design. After retiring early from the computing industry, Jack avidly participates in social network groups that share his passion for next generation technology solutions.
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See other products by Jack Creasey

Table of Contents (15) Chapters

Raspberry Pi Essentials
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started with Raspberry Pi 2. Configuring the Raspberry Pi Desktop and Software 3. Raspberry Pi and Cameras 4. Raspberry Pi Audio Input and Output 5. Port Input and Output on the Raspberry Pi 6. Driving I2C Peripherals on the Raspberry Pi 7. Going Mobile with Raspberry Pi 8. Creating a Raspberry Pi Line-following Robot Index

Getting started with I2C

The specifications for both I2C and SMBus are quite complex. For more in-depth documentation on the differences between I2C and SMBus, refer to the following resources:

  • http://smbus.org/specs/index.html

  • http://www.nxp.com/documents/user_manual/UM10204.pdf

The I2C bus is a shared-media multi-drop architecture with only two lines: (1) serial data (SDA) and (2) serial clock (SCL)—not including the ground. The bus is in a quiescent state when no transactions are being sent or received and both the SDA and SCL lines are pulled high by resistors to 3.3V in the Pi (or 5V in other implementations). The master and slave devices only ever pull the data line low, which is described as a wired OR connection. The following diagram shows the general I2C architecture and its location on the Pi I/O connector. Pins 3 and 5 can also be used as GPIO ports but not while you have I2C enabled, so you lose two GPIO ports.

At the protocol level, I2C is similar in concept to the RS232 serial...

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Authors (1)

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Profile icon Jack Creasey
LinkedIn
Jack Creasey has been in the technology industry for more than 30 years, the last 15 years as a Senior Program Manager in hardware and software design. His expertise includes designing, developing, and teaching IT courseware. He is an avid inventor and holds 13 patents in hardware and software design. After retiring early from the computing industry, Jack avidly participates in social network groups that share his passion for next generation technology solutions.
Read more
See other products by Jack Creasey
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