Book Image

BeagleBone Essentials

By : Rodolfo Giometti
Book Image

BeagleBone Essentials

By: Rodolfo Giometti

Overview of this book

Table of Contents (18 chapters)
BeagleBone Essentials
About the Author
About the Reviewers

The serial ports in Linux

Despite all the preceding serial ports names, in GNU/Linux /dev/ttyXXX, where the XXX string may vary according to the specific serial port implementations. For instance, the historical (and standard) names of the PC's UART serial ports are /dev/ttyS0, /dev/ttyS1, and so on, but (as seen in the previous chapters) the USB-to-serial adapters can be named as /dev/ttyUSB0, /dev/ttyUSB1 or /dev/ttyACM0, /dev/ttyACM1, and so on.

The tty prefix comes from the very old abbreviation of teletypewriter and was originally associated only with the physical connection to a Unix system. Now that name also represents any serial port-style devices, such as serial ports, USB-to-serial converters, tty virtual devices, and so on.

The Linux tty driver core (that is implemented using a char driver) is responsible for controlling both the flow of data across a tty device and the format of the data. This is obtained using a line discipline (LDISC), which is a mid-layer between the upper...