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Beaglebone Essentials

By : Rodolfo Giometti

5 (2)

Beaglebone Essentials

5 (2)

By: Rodolfo Giometti

Overview of this book

If you are a developer with some hardware or electrical engineering experience who wants to learn how to use embedded machine-learning capabilities and get access to a GNU/Linux device driver to collect data from a peripheral or to control a device, this is the book for you.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Installing the Developing System

1. 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

2. 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

3. Compiling versus Cross-compiling

Native compilation versus cross-compilation

Compiling a user-space software package

Compiling the kernel

Summary

4. Quick Programming with Scripts

4. 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

5. Device Drivers

What is a device driver?

The modutils

Writing our own device driver

Summary

6. Serial Ports and TTY Devices

6. 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

7. 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 – I2C

8. Inter-integrated Circuit – I2C

What is the I2C bus?

The electrical lines

The I2C bus in Linux

Getting access to I2C devices

Accessing the bus directly

Summary

9. Serial Peripheral Interface – SPI

9. 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

10. 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

11. Useful System Daemons

What is a daemon?

Useful and ready-to-use daemons

Writing a custom daemon

Summary

Index

Index

Accessing the raw bus

As for the USB and I²C buses, the SPI bus supports the raw access in order to directly send and receive messages from the SPI slaves, so it's time to show you an example on how we can do it on our BeagleBone Black.

We are going to manage a really simple device: the thermocouple to digital converter, as shown in the following image:

Accessing the raw bus

Note

The device can be purchased at (or by surfing the Internet) http://www.cosino.io/product/thermocouple-max31855.

By looking at the chip's datasheet at the URL http://datasheets.maximintegrated.com/en/ds/MAX31855.pdf, we can see that its functioning is very simple: it has one 32-bit register, where we can read the temperature information. The register has the following format:

14-bit thermocouple data				Res	Fault	12-bit internal temperature				Res	SCV	SCG	OC
D31	D30	...	D18	D17	D16	D15	D14	...	D4	D3	D2	D1	D0
Sign	MSB	X	LSB	-	X	X	MSB	X	LSB	-	X	X	X

So, in order to read the temperature data, we have to...

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Tech Concepts

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Programming languages

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