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Beaglebone Essentials

By : Rodolfo Giometti
Book Image

Beaglebone Essentials

By: Rodolfo Giometti

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Beaglebone Essentials
Rodolfo Giometti
May, 2015 | 240 pages
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Table of Contents (18 chapters)
BeagleBone Essentials
BeagleBone Essentials
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Installing the Developing System
Installing the Developing System
Embedded world terms
A system overview
Checking out the preloaded tools
Setting up a developing system
(Re)Installing Debian
Summary
2
Managing the System Console
Managing the System Console
Getting access to the serial console
Basic system management
A quick tour of the bootloader
Summary
3
Compiling versus Cross-compiling
Compiling versus Cross-compiling
Native compilation versus cross-compilation
Compiling a user-space software package
Compiling the kernel
Summary
4
Quick Programming with Scripts
Quick Programming with Scripts
The GPIO subsystem
Managing an LED in PHP
Managing an LED in Python
Managing an LED in Bash
Summary
5
Device Drivers
Device Drivers
What is a device driver?
The modutils
Writing our own device driver
Summary
6
Serial Ports and TTY Devices
Serial Ports and TTY Devices
What is a serial port?
Implementation of serial ports
The serial ports in Linux
The communication parameters
A simple serial echo
Managing a real device
Summary
7
Universal Serial Bus – USB
Universal Serial Bus – USB
What is the Universal Serial Bus?
The electrical lines
The USB bus in Linux
Accessing the raw bus
Summary
8
Inter-integrated Circuit – IC
Inter-integrated Circuit – IC
What is the IC bus?
The electrical lines
The IC bus in Linux
Getting access to IC devices
Accessing the bus directly
Summary
9
Serial Peripheral Interface – SPI
Serial Peripheral Interface – SPI
What is the SPI bus?
The electrical lines
Getting access to the SPI devices
Accessing the raw bus
Summary
10
1-Wire Bus – W1
1-Wire Bus – W1
What is the 1-Wire bus?
The electrical lines
The 1-Wire bus in Linux
Getting access to 1-Wire devices
Summary
11
Useful System Daemons
Useful System Daemons
What is a daemon?
Useful and ready-to-use daemons
Writing a custom daemon
Summary
Index
Index

The electrical lines

The I2C bus lines are reported in the following table:

Name

Description

SCL (Serial Clock)

This is the bus clock signal

SDA (Serial Data)

This is the bus data signal

GND

This is the common ground

I haven't reported the interrupt line since, strictly speaking, it's not part of the I2C protocol. It is usually implemented as a dedicated interrupt line connected to a CPU's interrupt capable pin (GPIO lines).

The GND line has been added because it's needed for electrical reasons, as the I2C protocol just talks about the SCL and SDA signals only.

In case of multiple devices are connected, the I2C devices can be connected in parallel, as shown in the following diagram:

Tip

The pull-up resistances Rp can be omitted in most cases, as most of the times an I2C controller integrates them by default.

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