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Questions tagged [termios]

Termios is Unix API for terminal I/O.

The anatomy of a program performing serial I/O with the help of termios is as follows:

  • Open serial device with standard Unix system call open(2)

  • Configure communication parameters and other interface properties (line discipline, etc.) with the help of specific termios functions and data structures.

  • Use standard Unix system calls read(2) and write(2) for reading from, and writing to the serial interface. Related system calls like readv(2) and writev(2) can be used, too. Multiple I/O techniques, like blocking, non-blocking, asynchronous I/O (select(2) or poll(2)) or signal-drive I/O (SIGIO signal) are also possible.

  • Close device with the standard Unix system call close(2) when done.

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Disable DSUSP in Python

An OSX user submitted a bug that CTRL+Y causes a python terminal application to be suspended, via dsusp causing SIGTSTP to be sent when the Python program tried to read on stdin. The code below to solves the problem: (context) import sys import…
Thomas
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ioctl complains a tty device is not a tty device

I am writing a program to open, setup, and write to a tty for rs485. I have played a bit with the tty device, and now I can't seem to open it anymore. Here is the relevant code: int rs485_enable(const char *dev_name, const speed_t speed) { int…
Gauthier
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Porting POSIX C code to windows

I just finished a small project written in C, where I read a data stream from a serial port and parse the incoming data. The software is written for POSIX systems (using termios) and follows the standard steps to working with serial i/o Opening the…
bing
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Pynput prints entered keys when Keyboard Listener finishes

This has been keeping me up quite a bit. When using the Python pynput module with keyboard.Listener, whatever is typed whilst the keyboard is listening is printed out in Terminal after the keyboard Listener has stopped. I've tried…
Mark Thompson
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How to use Termios to send bytes over a socat data transfer loop

I am trying to write a simple program that sends bytes over a serial connection. I created a data transfer loop using socat as follows: $ socat -d -d pty pty This creates a data transfer loop between /dev/pts/2 and /dev/pts/0. When I try to use…
BreakfastCalzone
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python: Terminal input, echo all except newline, and handle backspace?

I'm trying to write a function in Python-3.x which will prompt the user to enter characters from the keyboard. I want all characters to be echoed normally except for the final newline, which terminates the input. The following function does this…
HippoMan
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Failed to configure device ttyUSB0 (Arduino) on Ubuntu, C++

I can open serial port, but I can't correctly configure this port for write (/dev/ttyUSB0). Piece of code C++: int Platform::initConnection( const char* devicePath, int baudRate ) { int fd = 0; int ret = 0; struct termios…
Marat Gareev
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Ubuntu C++ termios.h example program

I searched a lot and tried many different ways, but I cannot send data to gtkterm via virtual serial bridge (for testing!). My idea is to communicate with an Atmega uC later on, but first I wanted to test the serial communication by setting up a…
T_Born
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struct termios setting for serial communication with arduino

on a unix based software, which must send a number between 0 and 179 to arduino and arduino will apply that number as an angle to a servo motor, but i do not know what parameters i have to change in the terminos struct to permit the serial…
Dadda Barba
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Manually Call a C++ Object's Initializer in C

I am working on a small application that was written in C++ and would like to use on my platform. Unfortunately, our cross-compile toolchain only (reliably) provides a C compiler. I looked at the application, and it is fairly simple and only uses…
Woodrow Barlow
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Raspberry Pi UART program in C using termios receives garbage (Rx and Tx are connected directly)

I have a simple program written in C which uses termios to send a basic string to the Raspberry Pi UART and attempts to read and output the response. The Rx and Tx pins on the Raspberry Pi are connected with a jumper so whatever is sent should be…
kourosh
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tcsetattr() fails

&"warning: GDB: Failed to set controlling terminal: Inappropriate ioctl for device\n" bool rs485::rs485ConfigPort() { termios portSettings; memset(&portSettings, 0, sizeof(portSettings)); portSettings.c_cflag |=…
Sam
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Linux Terminal Problem with Non-Canonical Terminal I/O app

I have a small app written in C designed to run on Linux. Part of the app accepts user-input from the keyboard, and it uses non-canonical terminal mode so that it can respond to each keystroke. The section of code that accepts input is a simple…
Charles Salvia
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How to get around no backspace when ICANON in non-canonical

I am using termios as suggested in a previous question I asked but now am asking if there is a way get backspace to work whilst using termios in non-canonical mode. I am using termios to have not have an echo If I use &=ECHO and &=ICANON this is the…
UNECS
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How to unplug a USB device under Ubuntu and C/C++ without rebooting

I'm using a C program with termios to exchange information and commands between my pc with Ubuntu and a USB motor controller. It works great and i'm able to successfully send messages over the serial port; however, sometimes it happens that if i…
Marcus Barnet
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