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GNU/Linux Rapid Embedded Programming

You're reading from GNU/Linux Rapid Embedded Programming

Product type Book

Published in Mar 2017

Publisher Packt

ISBN-13 9781786461803

Pages 732 pages

Edition 1st Edition

Languages

Concepts

System Programming

Author (1):

Rodolfo Giometti

Table of Contents (26) Chapters

GNU/Linux Rapid Embedded Programming

Credits

About the Author

About the Reviewer

www.PacktPub.com

Customer Feedback

Preface

Installing the Developing System

Managing the System Console

C Compiler, Device Drivers, and Useful Developing Techniques

Quick Programming with Scripts and System Daemons

Setting Up an Embedded OS

General Purposes Input Output signals – GPIO

Serial Ports and TTY Devices - TTY

Universal Serial Bus - USB

Inter-Integrated Circuits - I2C

Serial Peripheral Interface - SPI

1-Wire - W1

Ethernet Network Device - ETH

Wireless Network Device - WLAN

Controller Area Network - CAN

Sound Devices - SND

Video devices - V4L

Analog-to-Digital Converters - ADC

Pulse-Width Modulation - PWM

Miscellaneous Devices

The video tools

Even if using the sysfs interface to manage video devices in a more efficient manner, we can use a dedicated tool set named v4l-utils in the package by the same name, which can be installed as usual into the system if it is missing.

The main program in the package is v4l2-ctl that can be used to get a lot of information regarding a video device. Just to show the power of this command, let's try to explore all capabilities of a video device assuming we know about nothing of it. First of all, we can detect connected video devices using the --list-devices option argument as shown here:

root@bbb:~# v4l2-ctl --list-devices 
USB 2.0 Camera (usb-musb-hdrc.1.auto-1): 
   /dev/video0 
   /dev/video1

Then, we have discovered that our device has been composed of two video devices mapped into the system with the /dev/video0 and /dev/video1 files. Then, we can get some information regarding the device driver we're currently using to manage this device. This can be done using...

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Authors (1)

Rodolfo Giometti

Rodolfo Giometti is an engineer, IT specialist, GNU/Linux expert and software libre evangelist. He is the author of the books BeagleBone Essentials, BeagleBone Home Automation Blueprints and GNU/Linux Rapid Embedded Programming by Packt Publishing and maintainer of the LinuxPPS projects. He still actively contributes to the Linux source code with several patches and new device drivers for industrial applications devices. During his 20+ years of experience, he has worked on the x86, ARM, MIPS, and PowerPC-based platforms. Now, he is the co-chief at HCE Engineering S.r.l., where he designs new hardware and software systems for the quick prototyping in industry environment, control automation, and remote monitoring.

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