Programming
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You're reading from  GNU/Linux Rapid Embedded Programming

Product typeBook
Published inMar 2017
Reading LevelIntermediate
PublisherPackt
ISBN-139781786461803
Edition1st Edition
Languages
C
Tools
LinuxEmbedded Systems
Concepts
System Programming
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Author (1)
Rodolfo Giometti
Rodolfo Giometti
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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.
Read more about Rodolfo Giometti

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What is the universal serial bus?

The Universal Serial Bus (USB) is a computer bus used by a CPU and its peripherals to communicate to each other. In every USB communication, at least one USB host and one USB device exists. The former is the one that effectively directs the traffic flow to devices, while the latter is the one that simply answers all the host's requests.

Practically, the USB host periodically queries all connected USB devices in order to discover if they want to send a message to it. So, the host is smart enough to understand which kind of peripheral the user has connected in, and it can reconfigure the system in order to correctly manage it. This magic happens each time a USB device is first connected to a USB host, thanks to the enumeration process.

The enumeration starts by sending a reset signal to the USB device (at this stage, the data rate of the USB device is automatically determined), and after the reset, all the information of the USB device is read by the host and...

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GNU/Linux Rapid Embedded Programming
Published in: Mar 2017Publisher: PacktISBN-13: 9781786461803
© 2017 Packt Publishing Limited All Rights Reserved

Author (1)

author image
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.
Read more about Rodolfo Giometti

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