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You're reading from GNU/Linux Rapid Embedded Programming Your one-stop solution to embedded programming on GNU/Linux

Product type Paperback

Published in Mar 2017

Publisher Packt

ISBN-13 9781786461803

Length 732 pages

Edition 1st Edition

Languages

Tools

Embedded Systems

Concepts

System Programming

Author (1):

Rodolfo Giometti

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Table of Contents (20) Chapters

Preface

1. Installing the Developing System FREE CHAPTER

2. Managing the System Console

3. C Compiler, Device Drivers, and Useful Developing Techniques

4. Quick Programming with Scripts and System Daemons

5. Setting Up an Embedded OS

6. General Purposes Input Output signals – GPIO

7. Serial Ports and TTY Devices - TTY

8. Universal Serial Bus - USB

9. Inter-Integrated Circuits - I2C

10. Serial Peripheral Interface - SPI

11. 1-Wire - W1

12. Ethernet Network Device - ETH

13. Wireless Network Device - WLAN

14. Controller Area Network - CAN

15. Sound Devices - SND

16. Video devices - V4L

17. Analog-to-Digital Converters - ADC

18. Pulse-Width Modulation - PWM

19. Miscellaneous Devices

What are TTY, serial, and UART lines?

Early user terminals connected to computers through a serial line were electromechanical teleprinters or teletypewriters (TeleTYpewriter, TTY), and since then, TTY has continued to be used as the name for such text-only console and the relative serial port. In fact, in a GNU/Linux system, a serial port is usually referred to in the /dev directory with the /dev/ttyS0, /dev/ttyS1, /dev/ttyUSB0, or /dev/ttyUSB1 device for the USB emulated devices, as we already saw in the previous chapters.

So a serial port is not a peripheral, but it is just a serial communication interface through which information transfers in or out one bit at a time. This communication is implemented by modern computers via a Universal Asynchronous Receiver/Transmitter (UART) device, which has a side connected to the main CPU and the other side with a circuitry, that is, a physical interface (Phy in the following diagram) useful to translate the electronic signals in a suitable form...